A11107 311004

NBSIR 84-2918

Fortran 77 Computer Program for

Test Procedure Calculations of

Vented Heaters

Robert A. Wise

Fletcher C. Parsons

U.S. DEPARTMENT OF COMMERCE

National Bureau of Standards

National Engineering Laboratory

Center for Building Technology

Building Equipment Division

Washington, D.C. 20234

April 20, 1984

Issued Sept. 1 984

Prepared for: United States Department of Energy

Washington, D.C. 20585

QC100

,U56

34-291

1934

c a

NBSIR 84-2918

FORTRAN 77 COMPUTER PROGRAM FOR

TEST PROCEDURE CALCULATIONS OF

VENTED HEATERS

Robert A. Wise

Fletcher C. Parsons

U S. DEPARTMENT OF COMMERCE

National Bureau of Standards

National Engineering Laboratory

Center for Building Technology

Building Equipment Division

Washington, D.C. 20234

April 20, 1984

Issued Sept. 1984

Prepared for: United States Department of Energy

Washington, D.C. 20585

U.S. DEPARTMENT OF COMMERCE, Malcolm Baldrige, Secretary

NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Director

ABSTRACT

The Fortran 77 computer program described in this report is to

he used to calculate results from tests run on vented heaters.

The Department of Energy recently published a revised test

procedure for such heaters but which contains a simplified

method for testing with a number of testing options that allow

more detailed tests to be run. The new procedure also provides

for the testing of units with manual controls of two types,

modulating controls of two types, and the testing of units

incorporating thermal stack dampers as well as

electro-mechanical dampers. Once input selections have been

made, the program performs the calculations required and prints

out the results.

Key words: computer program; energy; test procedure; vented

heater; furnace.
TABLE OP CONTENTS

Page

ABSTRACT ii

INTRODUCTION 1 PROGRAM INPUT 3

PROGRAM DESCRIPTION 8

DEVIATIONS PROM TEST PROCEDURE 11

CONCLUSIONS 15

REFERENCES 16

LIST OP TABLES

TABLE 1. Input variables 9

LIST OP FIGURES

FIGURE 1. Program input form 4

FIGURE 2. Input- var iable flow chart 10

FIGURE 5» Program flow diagram 12

LIST OF APPENDIX

APPENDIX A. Computer Program Listing A-1

APPENDIX B. DOE Test Procedure B-1

APPENDIX C. Examples C-1

i i i
INTRODUCTION

Vented heaters are home heating devices that exhaust the

products of combustion to the outside and that furnish warmed

air to a living space without duct connections to distribute

the heated air. They may use electrically driven fans or

blowers to circulate the air from the heater to the living

space

.

In 1978 the Department of Energy (DOE) published in the Eederal

Register [l]*a Final Rule test procedure to be used to test

vented heaters. This procedure was almost identical to the one

for furnaces published at the same time. The rule required

that the results of specified tests be used to calculate the

estimated annual operating cost, the annual fuel utilization

efficiency (AFUE), and the estimated regional annual operating

cost. The National Bureau of Standards (NBS) published a

report [2] that described the rule as it was proposed to DOE

with a Fortran computer program to perform the many and

complicated calculations needed to determine the required

efficiency and cost information. In 1982, NBS published

another report [3] describing a proposed modification to the

furnace and the vented heater test procedures to test these

products when they incorporate modulating type controls. This

publication also contained a Fortran computer program, titled

FBVH, which is the basis for the revised program in this

report

.

On March 28, 1984, DOE published a revised final rule test

procedure for furnaces, heaters, and vented heaters [4]. The

vented heater section provides an entirely new test method for

the determination of annual fuel utilization efficiency (AFUE)

and the estimated operating cost per million Btu output. It

deletes the requirements for determination of annual operating

costs

.

The new procedure is quite different from the one it replaces

in that it allows the omission of time consuming and

computationally complicated heat-up and cool-down tests. The

tests are replaced with a formula that applies constant

multiplying factors to the steady-state efficiency, to the

stack and flue draft factors, to the pilot light energy ratio

and to the loss in efficiency due to jacket losses for floor

furnaces. The coefficients were determined from a multiple

regression of test data on a number of units that were tested

using the old DOE test procedure [5]. The newly published

procedure also provides test methods for evaluating units with

two different types of modulating controls (step modulating and

two stage) and two types of manual controls: those with just

"on"-"off " control and those

* Numbers in brackets pertain to references listed on page I 7 .

- 1 -
that can he adjusted for the fuel burning rate as well as "on"

and "off." Background information on the test method for

modulating controls may be found in Reference [6]. Finally, a

test method to be used for units incorporating thermal dampers

has been added to the procedure. The thermal damper test uses

a new off-loss tracer gas type of test. The tracer gas test is

also allowed to be used as an option for the measurement of the

off period heat losses of units without thermal dampers. When

the off-loss method is selected or required, the simplified

AFUE calculation is not used. Instead, a cycling part load

efficiency is calculated and used in determining AFUE. For

manual type controls a psuedo part-load efficiency is

calculated using only the on-time infiltration loss term.

This report describes a Fortran 77 computer program (Appendix

A) to be used to calculate the results of tests performed on

vented heaters. The program serves two purposes: it provides

computerized calculations of a complex test procedure, and it

explicitly defines the test method to be used. The program

will be directly useful to some manufacturers or laboratories

involved in testing, it can be used to check programs already

written, or it can serve as the basis for writing similar

programs in other computer languages. The explicit definition

can be useful to test users in resolving questions that arise

regarding the exact meaning of the wording of the published

procedure. The steps to be followed and the meanings of the

word descriptions are clarified with a computer program that

covers all permitted calculation steps and sequences.

- 2 -
PROGRAM INPUT

Appendix B contains the final rule regulation published by DOE

on March 28, 1984 [4]. Apendix B is different than the DOE

publication in that only the pages relating to the testing

requirements of vented heaters are included and the columms on

the pages have been rearranged to make the text and formulas

flow in a sequential and logical order. This publication

specifies the test methods, the data required, and the

calculations necessary to arrive at the APUE and the dollars

per million Btu output. Appendix A contains a Fortran 77

program which performs these calculations. This report will

not attempt to describe the details of the test but rather

describe how the data are entered into the program and how the

calculations are performed.

The Fortran program is written so that input information is

taken from a previously written data file stored in the

computer. An example of such a file is on page C2 of Appendix

C. In the Univac computer at NBS, the data is in an element of

a file. After a response to the instruction given on line 340

of the program listing in Appendix A is entered, the computer

reads the lines in the file (element) one by one as READ

statements are encountered. Users of the program may want to

modify this input structure to meet the requirements of the

computer being used. Most of the READ statements of the

program use the free field format, READ(6,*) where logical unit

"6" is the terminal or the "@ADD"ed element. Integer or real

numbers may be entered indiscriminately and the number of

decimal places in the numbers is immaterial. Spaces or commas

may be used to separate entered values. Some compilers may not

accept this type read statement so the program may have to be

modified with additional FORMAT lines.

Figure 1 is an input data sheet which may be used to record

test data prior to entering the data into the computer input

file. An example of a data sheet with handwritten test result

measurements is shown on page Cl of Appendix C. The measurement

units or dimensions to be used for each entry are given

directly under the name of the data value to be entered.

Although some of the units are not specified in the test

procedure, the units on the input form have been selected to

conform to the numerical constants and equations of the test

procedure. The option of entering temperatures in fahrenheit

or in Celsius has been provided since converting while entering

data is inconvenient. If Celsius value is entered as the

ambient temperature, then the conversion is performed on all

temperature measurements entered on that line. In the same

manner, the option of entering barometric pressure in inches of

mercury or in milibars has been provided and if barometric

pressure was not known or recorded, 0.0 may be entered,

program will then use a default value of 30 inches of mercury.

-3 -
VENTED HEATER PROGRAM INPUT FORM

Title #1

Title #2

System

l_

Fuel

ft Controlft Option

ft Fuel Costc/Therm.

Elect. Cost

c /kWh

Pilot

Btu/m in*

Elect

.

kW * J acketLoss, * NOTE ff 1 . Enter 50fj Input rate values

if manual control, type ft 4.

ft 2. *=enter 0.0 if not measured

Fuel Input

Etu/min.

Room Amb.

F or C

Stack Temp.

F or C * Flue Temp.

F or C

* C02 Stack

*

* C02 Flue

£

E nter next line only if tested at second (reduced) input rate.

I

Enter next line only if with damper and

Stack Area

sq . in.

Damper area

sq . in

.

Angle

deg.

off-loss not measured.

Enter next line only if draft measured (Do), option ft 2.

Barometer

"He or mb*

Gas Temp.

F or C

Gas Cone.

# or -prim

r-r.? _ ^ \ r ...l r Gas Flow

cu .f t . /min

Trac .Cone

.

$> or com

Flue Temp.

F or C

Enter next lines only if measured high fire off-loss measured

BarometerIf "He or mb

Gas Temp.

F or C

Gas Cone.

% or pom

Gas Flow

cu . f t . /min

Me as

ft Trac . Cone

.

i> or ppm

Flue Temp.

F or C

12

3

A

6

T

/CQ

ic

Enter next lines only if reduced fire off-loss measured

Barometer

"He or mb*

Gas Temp.

F or C

Gas Cone.

$ or ppm

Gas Flow

cu . f t . /min

Me as

a

ft Trac . Cone

.

# or ppm

Flue Temp.

F or C

12

JiA

56

*-7

1 s

Q

10

Figure 1 -4-
After the input information from the "Input form", Figure 1, is

transferred to a data input element in the computer, the

computer program VENT, Appendix A, can he run. The data

relating to the tests that were run is READ from the stored

data file, or element, line by line by the Fortran READ

statements at the following line numbers.

Line 380

Title. This entry may contain up to 80 characters of

alphanumeric written material such as a title, test date,

manufacturer or model information etc.

Line 380

Title. The second entered title line may contain

additional information not included in line 1 , or a blank

line may be entered.

Line 470

Conditions. This line must contain six numeric entries of

four integer numbers followed by two real numbers. The

integer numbers select the type of unit being evaluated

and the type of fuel used from Tables 1 and 2 of the test

procedure, the type control incorporated in the unit

tested, and the optional test procedures used. For

convenience in reading the program, the meanings of the

input selection values are included as comments on lines

480 to 650. The two real numbers are the costs of the

fuels used. The cost of fuel is made as an input READ

rather than as a fixed DATA statement line in the program

to remind the user to enter the latest cost values

published by DOE in the Federal Register. The costs of #1

oil, manufactured gas, and butane are not included in the

DOE published costs. It is suggested that the cents per

therm of natural gas be used for manufactured gas, that

the cents per gallon of #2 oil be used for #1 oil, and

that cents per gallon of propane be used for butane.

Line 730

Auxiliary data. Three real number entries are entered on

this line. Note that the pilot light fuel input rate is

in Btu per minute rather than the more customary Btu/hour.

The Btu/min. units were selected because the only time a

gas fuel input rate dimension is given in the test

procedure the units are in Btu /min. This is in section

4.3*3 of the test procedure where the burner fuel input

rate is used in calculating off-losses. The program user

can change the data input units to Btu/hr. by dividing

the entered values of the pilot and the burner fuel input

rates by 60.0 as an added statement or adding a "/60." in

lines 2210, 3370, and 3380.

The jacket loss in percent should be entered as 0.0 for

units installed indoors. For floor furnaces (heaters) the

measured value using ANSI standard Z21. 48-1976 for "vented

floor furnaces" multiplied by 0.712 should be used.

- 5 -
Line 900

The remaining lines in the input data file contain

measured test data values. The only test data entries

always needed are READ on line 900 of the program (the

fifth line on the input form, Figure 1.) This line must he

entered and it must contain six real number test data

results. However, if the specified tests on the tested

unit do not require that some of the values be measured,

i.e., flue temperature on units having draft diverters, a

value of 0.0 is entered. Note that the fuel input value

is in Btu/min (see the discussion above regarding the

pilot light fuel input rate entry.) If the unit tested has

a manual type control with adjustable fuel input rate, the

data entered as "Fuel input" would be the 50$ fuel input

rate actually used.

Line 980

The next line on the input form is the same as the

previous line except that the test values are those

measured at the reduced fuel input rate when the unit

tested has a modulating type control. The line is skipped

if the control is non-modulating.

Line 1050

The physical measurements of the stack damper are entered

if a damper is included in the unit being tested. This

applies only to electro-mechanical dampers; thermal

dampers must be tested using the off-loss tracer gas test.

The data must be entered for all units with dampers unless

the option of off-loss testing has been taken, in which

case the line of data is skipped.

Line 1 1 40

The next line of data is skipped on the Input Form unless

testing option #2 was selected, "Optional procedure for

determining "Dp" for vented home heating equipment." If

the option was taken, data from the tracer gas test of

section 3*6 in the test procedure is used.

Lines 1260 and 1300, also 1420 and 1460

The last two groups of input data values on Figure 1 are

used only if the tracer gas off-loss testing option #3 was

selected. If the optional procedure (mandatory for units

with thermal dampers) is used, the test condition input

values are entered on the first line followed by ten

measurements of tracer gas concentration and flue gas

temperature. The first measured pair of values would have

been taken 30 seconds after the fuel input was turned off

after steady-state conditions had been attained. The next

nine pairs of values would have been taken at one minute

intervals after the first readings.

Both groups of test data, high-fire and reduced-fire, will

be entered if the tested unit has a two-stage modulating

type control. For single-stage

- 6 -
non-modulating controls only the high-fire values are

entered, and for step-modulating type controls only the

reduced fire test data are taken and entered.

As the program is structured, a minimum of five lines of input

data must be entered and a maximum of 28 line entries may be

used. It is possible to have only four test data values or as

many as 39 measured test data values.

-7-
PROGRAM DESCRIPTION

The 401 line Fortran 77 program of Appendix A contains 110

comment lines, three subroutines, and one function. The

function, lines 4060 to 4090, converts temperature value units.

Following are the starting lines of the subroutines along with

a description of their use.

Line 3720

Subroutine SSLOSS calculates the steady-state test results.

Air mass-flow rate ratio, RTF; S/F ratio, SFR; sensible

heat loss, QSSS; and steady state efficiency, EFYSS, are

calculated. The higher heating value, HHV ; air to fuel

ratio, AFR; and latent heat loss, QL, are assigned table

values. This subroutine is similar to SENLOS which was

used in previously published Fortran programs.

Line 3460

Subroutine WGHT provides the values needed for modulating

furnace evaluation. The balance point temperature is

calculated. The average outside air temperatures, when in

the high and reduced firing rate modes, and the ratio of

time during the heating season that the unit is in its low

firing rate mode are selected from the values listed in

Table 3 of the test procedure. WGHT is similar to the

subroutine WEIGHT used in the program FBVH [3] except that

16 values of "Heat output ratio" from Table 3 are used as

look-up table values.

Line 3270

Subroutine LOSOFF is used when the optional test procedure

for measuring off-losses is used. The subroutine

calculates latent and sensible heat losses during the off

period when the unit is cycling. LOSOFF is similar to the

subroutine OFFLOS of program FBVH except that only 10

rather than 20 measurements are used. Also, the barometric

pressure, Pb, required by the test procedure is

incorporated into the equations.

Input to the program was covered in the previous section but

Table 1 on the following page of this report should be helpful

in comparing the input variable names in the test procedure

with the names used in the program. The number of the section

of the test procedure, Appendix B, where the variable name

first appears is also listed along with the units that apply to

the variable. The units are not necessarily in the section

where the name first appears. The subscripts and number-type

to alpha letter convention of Fortran make the renaming

neccessary. Figure 2 shows a flow chart of the inputs to the

program. The chart is self explanatory and clearly illustrates

-8-
TABLE 1 INPUT VARIABLES FOR

VENTED HEATER TEST PROCEDURE

Program Test Pros. Sect ion Units

QP Q P 3-5 Btu/min.

PE p. 3-1.3 kilowatts

QJ 3.2 %

QIN Q tn 3.1.1 Btu/min

.

TRA T r . 3.1.1 Deg. P

TSS T .,.. 3.1.1 Deg. P

TPS 3.1.1 Deg. P

C02S

C02P

X C028 Y

cojf

Q red . tn

3.1.1

3.1.1

$

%

QINR 4.1.11 Btu/min

.

TRAR - - Deg. P

TSSR - - Deg . P

TPSR — - Deg. P

C02SR — - * C02PR — - £

AD Ad 3.4 sq. in.

AS A, 3.4 sq. in.

AN n 3-4 Degrees

PB P„ 3-6 in. Hg

TT T t 3.6 Deg. P

CTT - $ or ppm

VT V. 3.6 cu . ft . /min

CT c t 3.6 $> or ppm

TP T;. off 3.6 Deg. P

PBO P b 4.3.3 in. Hg

TTO T t 4.3.3 Deg. P

CTTO c t

- 4.3.3 $ or ppm

VTO V 4.3.3 cu . f t . /min

CTO(I) c: 4.3.3 $> or ppm

TFO(I) T a, off 4.3.3 Deg. P

PBOR - - in. Hg

TTOR - - Deg . P

CTTOR - - # or ppm

VTOR - — cu . ft . /min

CTOR(I) - — or ppm

TFOR(I) - - Deg. F

NOTE:

- Means that the variable name is the same ; another variable name in the test procedure

as

- 9 -
VENTED

HEATER

PROGRAM,

"PROG.

VENT

INPUT

VARIABLE

PLOW

CHART oo

CO

aJ

rci0p

Q) -PC

KN 0) n CO

C\J (0 t— -p 0

CO •r-4 P PS P 0 O a 0 -P 0

Eh

O o

*—

Ph CO P O

1—l

CO 0

CO 0 c •• rH o P ,0 - 0 cd ra V£> P-l "H -P » 0 P c

in 03

a 0

np > 0

CO 0

>-* i—l nd

p

CO cti 0 2

1—1 0 C TO P •r^ a

II 0 1 1 0 P S

Ph -P 0 s n < «H c

1=1 1—1

pD 1—1 w

EHoa

-10

Figure
the various inputs required for the different control types and

options selected. The input section of the program, lines 380

to 1560 covers all of the inputs, the various options, the

conversions of temperatures and "barometric pressure, and the

printout of the input titles, program selections, and test

data. No checks have been incorporated to assure that the data

entered fall within acceptable or normal ranges and no check

for incorrectly entered data has been made.

After the the data have been read, lines 1560 to line 3050

calculate the results needed to obtain the values required by

the test procedure, section 4-30.22, pages 12156-7 (AFUE and

estimated operating cost per million Btu output.) The

calculation portion of the program can be seen in the

simplified flow chart of Figure 3* The chart shows only the

subroutine calls and a few intermediate variables and omits

most calculations and many intermediate values. The flow chart

and the comments in the program itself should be sufficient to

explain the steps taken and the conditional evaluations that

are made to perform the needed actions. Only two checks have

been included in the program. The one at lines 2010, 2020 is

made to assure that "Do" is not negative or greater than one.

If greater, "Do" is made equal to one and if less than 0.0 it

is changed to 0.0. The formula in Section 4.4 used to

calculate "Do" is not a rigorous mathematical evaluation so it

can generate values that have no physical significance. At

lines 2370, 2380, another check is made to make sure that the

draft factors, Df and Ds , are not assigned values greater than

one. Again, if greater than one, it is made equal to 1.0.

The calculated value, "Do", is printed out along with the input

measurements of the damper, and "Df" and "Ds" are printed out

when the simplified AFUE calculation is used. When modulating

type controls are tested, the heat fractions and balance point

temperature are printed. When the tracer gas test for

off-losses is used, the "on" and "off" infiltration and

sensible heat losses are printed as output. The main output of

the program is the steady state efficiency and the two results

required by the test procedure, AFUE and cost per million Btu.

DEVIATIONS FROM TEST PROCEDURE

The Fortran program of this report was written to conform as

closely as possible to the published test procedure. In

several instances there are differences due to typographical

errors or inadvertent omissions of needed changes that were not

included in the procedure as published. The program was

written with as many errors corrected as possible. The

deviations are in sections of Appendix 0 of the test procedure

(Appendix B of this report). The section numbers and changes

are as follows:
VENTED HEATER SIMPLIFIED FLOW DIAGRAM, PROGRAM "PROG . VENT”

( READ)

SSLOSS

FIGURE 3

-1 2 -
4 . 1 . 7 - The off-cycle stack draft factors, Ds , from Table 1 of the test procedure are not given for systems 9 through

12. For these types, Ds is taken as 1.0, is assigned at

line 300 and 2100, and used in line 2410. It would appear

that, for direct vent systems, Ds should equal 0.0.

However, 1.0 was used for Ds in the data used in a multiple

regression to determine the coefficients of the simplified

test method AFUE formula. Because of this, a Ds of 1.0 is

used in the program.

4.1.11 and 4*1.12 - The heat output rate calculation should

include division by 100.0 to change percent to a decimal

value. Since these values are used to determine the ratio

"R" , the omission is not important in the program

calculations but the changes were made in lines 3570 and

3590.

4.1.17 - The simplified test method calculation of AFUE on

line 2410 uses 3-93 as the coefficient for the jacket loss,

Lj , because this value is a multiple regression coefficient.

A change in one coefficient would require a change in the

others. The change from 3*93 to 2.8 in the test procedure

was made to reduce the adjustment factor for lower outdoor

air temperature and cycling conditions. Measured jacket

loss may be multiplied by 0.7 prior to entering the data and

running the program to make the test procedure allowed

reduction. However, the correlation between results

obtained using the simplified vs. the standard test methods

is not known.

4.2.1 - The ratio of S/F is not given in a table or

calculated for units using outside air for combustion or for

oil fueled units. This S/F calculation and the Section

4.2.2 calculation of "Ki,on" are used for all types of units

in later Section 4*3* The program has been written to use

0.0 for S/F for outside installations. The 0.0 causes

"Li, on" to be calculated as zero for floor furnaces. The

subroutine SSLOSS has been written so that for oil fueled

units, a ratio of Rt,s to Rt,f is used without the 1.3

multiplication factor if a C02 measurement was made in the

stack (above the barometric damper). If not measured, a S/F

of 1.4 is assigned. The assignments or calculation is made

in the subroutine SSLOSS on lines 3870, 3880, and 3930.

4.2.5 - The psuedo part-load efficiency calculation for

manually controlled units omits jacket losses of floor or

outside installations. Although none are known to exist,

such designs are possible so the program has been modified

at line 2550 to subtract Cj * Lj to calculate this

efficiency, EFFYU. In the attached examples, Appendix C,

the second example showed a AFUE of 12$ lower than if Cj=2.8

and Lj=4*5 were omitted.

4.3*2 - The values of XI and X2 are reversed in the test

procedure, section 4*1.2. The correct values are used in

lines 2630 and 2670 in the program.

-13
4.3*3, 4-3.5 and 4.3.6 - The values of 20 minutes for ton

and toff are given in the test procedure. The correct 10

minute value is used in the program on the several lines on

which these values appear. Also, the number of measured

values of tracer gas concentration and flue gas temperature

is ten instead of twenty as listed in the procedure.

4*3.6 - The typographic error in section 4.3*6 that used

"Ls,off" a second time instead of "Li, off" was corrected on

line 2850 of the program.

4*3.7 - The weighted steady-state efficiency was used on

line 2920 instead of just steady-state efficiency for the

calculation of AFUE as was done in section 4-3.7

4.5.1 The value 100.0 was replaced with the variable CTT on

line 2170 so that diluted tracer gas may be used for the

"Dp" test as it was permitted in the offloss test on line

3330 of subroutine LOSOFF. The variable was defined in

section 4 . 5-1 but not used in the equation.

- 14-
CONCLUSIONS

The Fortran program described in this report was tested with

many simulated runs with as many combinations of heater types,

control types, test options etc. as practical. A few of these

tests are included in Appendix C for illustrative purposes.

Each run is preceded by a printout of the data entry file used.

The examples are not actual tests but were made up to cover

extreme conditions. The Fortran 77 computer program of this

report should prove useful to the vented heater manufacturing

industry, testing laboratories, and those persons who must

understand the test procedure and its calculations.

- 15 -

APPENDIX A - PROGRAM "VENT"

100

110

1 20

1 30

140

150

1 60

170

180

190

200

210

220

230

240

250

260

270

280

290

300

^1 0

320

330

340

350

360

370

380

390

400

410

420

430

440

450

460

470

480

490

500

510

520

530

540

550

560

570

580

590

600

610

620

630

640

650

660

c ***** HTRS*PROG. VENT *****

C Program to use the DOE test procedure for Vented Heaters on units

having single, two-stage, step—modulat ing or manual controls.

C The manual type may have adjustable fuel rate or only on-off

C control. A test method for thermal dampers is also included.

C This program is based on the previously published program

C titled FBVH but is modified to include the changed

C procedures of the ammended final rule.

C Input to the program starts with two lines of identification.

C The input data to the program requires three additional lines

C but other lines may be added to provide data for reduced

C firing rate, damper measurements, and optional power burner

C draft factor data or off-loss test data.

C

C By: R. A. Wise, P.C. Parsons, 3-1-84

C

DIMENSION TITLE (20, 2) , CTO (10) ,TF0(10) ,CT0R(10) ,TF0R(10) , # CDF (12), CDS (12)

DATA PI/3.141592654/

DATA CDF/1 .,.4,1. ,.4,1. ,.4,1. ,.4,1. ,.4,1. ,.4/

DATA CDS/3*1 •

,

-85,4*-1 . ,4*1 .0/

DATA TOAHI, TON, TOFF/45. ,10. ,10./

C

WRITE(

6

, 500)

500 F0RMAT(//20X, 'VENTED HEATER TEST REPORT')

WRITE(6, 501

)

501 FORMAT ( /2X, ' Input data, type-"@ADD FILENAME. ELEMENTNAME" '

)

C

C Read two lines of title and test set-up information.

C

READ (5,502) TITLE

502 FORMAT (20A4)

WRITE (6,503) ( (TITLE(I, J) ,1=1 ,20) , J=1 ,2)

503 FORMAT ( /2(5X, 20A4/)

)

C

C Read test conditions

C

READ (5,*) ISYS , IFUL, ICRL, IOPT ,FC , EC

C

C ISYS

C 1 =Hood/d iverter , Atmos

C 2=Hood/d iverter , Power

C 3=Barometr ic , Atmos.

C 4=Barometr ic , Power

C 5=Hood/Diverter , Atmos

C 6=Hood/Diverter , Power

C IFUL

C 1 =No . 1 oil 1 C 2=No . 2 oil 2

C 3=Natural gas 3

C 4=Manufactured gas 4

C 5=Propane 5

C 6=Butane

C FC=Fuel cost: Cent

C EC=Electric cost,

C

WRITE( 6,521 )

. , Damp

.

, Damp.

ICRL

=Single stage

=Two stage

=Step Modulating

=Manual w/heat control

=Manual, on-off

7=Barometr ic , Atmos., Damper

8=Barometric , Power , Damper

9=Direct, Atmos.

10=Direct, Power

11=Direct, Atmos., Damper

12=Direct, Power , Damper

IOPT

1 =No optional tests

2=Meas. draft factor

3=Measured off-loss

or thermal damper

s/Therm for 3 or 4 , Cents/Gallon for others.

Cents/kWh

-A1-
670 521

680

690 522

700

710

720 523

730

740

750 524

760

770 525

780

790 526

800

810 527

820

830 528

840

850

860

870

880 530

890

900

910

920

930

940

950 531

960

970

980

990

1000

1010

1020

1030 1 1040

1050

1060

1070 5^2

1080

1090 4

1100

1110

1120 533

1 1 30

1 140

1

1

50

1 1 60

1170

1180

1

1

90

1 200

1210 534

1 220

1230 2

1240

1 250

F0RMAT(/1X, ************ INPUT SELECTIONS ************

WRITE( 6 , 522

)

FORMAT (/IX, 'SYSTEM # FUEL CONTROL OPTIONS ',

# 'FUEL-COST ELECT-COST')

WRITE( 6 , 523 ) ISYS , IFUL , ICRL , IOPT , FC , EC

FORMAT (4(6X, II )

, 6X, 2(3X,F6 . 2)

)

READ ( 5

, * ) QP , PE , Q

J

IF(QP.GT.O.O)WRITE(6,524)QP

FORMAT (IX, 'WITH PILOT LIGHT, QP=BTU/MIN. =

' ,F5 . 1

)

IF( QP . LT . 1 .0)WRITE(6,525)

FORMAT( IX, 'WITHOUT PILOT LIGHT')

WRITE( 6 , 526 )PE

FORMAT ( IX, 'ELECTRIC POWER, KW=',F4-3)

IF ( QJ . GT . 0 . 0 )WRITE( 6 , 527 ) QJ

FORMAT (IX, 'JACKET LOSS, % LOSS= ' ,F5 . 2 , /

)

IF ( QJ . LT . 1 . 0)WRITE( 6 , 528)

F0RMAT(1X 'INSTALLED INDOORS',/)

WRITE(6 *)'*********** INPUT DATA ******************

IF( ICRl!nE. 4)WRITE(6 , *) 'HIGH FUEL INPUT RATE DATA'

IF( ICRL . EQ . 4 )WRITE( 6

, *

)

' 50^ FUEL INPUT RATE'

WRITE(6 , 530)

FORMAT (5X, 'INPUT AMB TEMP TEMP C02 C02'

# /4X, 'BTU/MIN TEMP STACK FLUE STACK FLUE

READ ( 5

» * ) QIN , TRA , TSS , TFS , C02S , C02F

IF ( TRA . LT . 40 . 0 . AND . TSS . GT . 1 0 . 0) TSS=CF ( TSS)

IF ( TRA . LT . 40 . 0 . AND . TFS . GT . 1 0 . 0 ) TFS=CF ( TFS

)

IF ( TRA . LT . 40 . 0 ) TRA=CF ( TRA

)

WRITE( 6 , 531 ) QIN . TRA , TSS , TFS , C02S , C02F

FORMAT ( 4X , 6F7 . 1

)

IF(ICRL.EQ.1 .0R.ICRL.GT.3)G0 TO 1 WRITE (6,*) 'LOW FUEL INPUT RATE'

READ ( 5

, *)QINR, TRAR , TSSR , TFSR , C02SR , C02FR

IF(TRAR.LT. 40.0. AND. TSSR.GT. 1 0.0)TSSR=CF(TSSR)

IF ( TRAR . LT . 40 . 0 . AND . TFSR . GT . 1 0 . 0 ) TFSR=CF ( TFSR

)

IF ( TRAR . LT . 40 . 0 ) TRAR=CF ( TRAR

)

WRITE( 6,531 )QINR, TRAR, TSSR, TFSR, C02SR,C02FR

IF ( IOPT . EQ . 3 )G0 TO 2

IF( ISYS . LT . 5 • OR . ( ISYS . GT . 8. AND. ISYS . LT . 1 1 ) )G0 TO 4

READ (5,*) AD. AS, AN

WRITE( 6 , 532 ) AD , AS , AN

FORMAT (' DAMPER MEASUREMENTS: DAMPER AREA=',F6.2,

# ' , STACK AREA= ' ,F6 . 2 ,

' ANGLE= ' , F4 - 1 ) IF (IOPT . NE. 2) GO TO 5

WRITE( 6

, *) ' OPTIONAL Dp PROCEDURE TEST DATA'

WRITE(6, 533)

FORMAT (IX,' BARO. TEMP. CONC . VOLM. CONC.

# /IX,' PRES. TRAC. TRAC. TRAC. FLUE

READ ( 5

, * ) PB , TT , C TT , VT , CT , TF

IF ( PB . EQ . 0 . 0 ) PB=30 .

0

IF(PB.GT. 100. ) PB=PB/ 33. 867

if(tt.eq.o.o)tt=tra

IF ( TT . LT . 40 . 0 ) TF=CF ( TF

)

IF(TT.LT.40.0)TT=CF(TT)

WRITE ( 6,534)PB,TT,CTT,VT,CT,TF

FORMAT (2X,F5. 2, 3X,F4.1 , 3 ( 2X , E7 . 2 )

, 2X, F5 . 1

)

GO TO 5

IF ( ICRL. EQ . 3 )G0 TO 3

WRITE(6,*) 'HIGH FIRE OFF-LOSS DATA.'

WRITE(6, 533)

TEMP. '

,

FLUE '

)

-A2-
1 260

1270

1280

1 290

1300

1 310

1320

1330

1340

1350

1360

1370

1380

1390

1400

1410

1 420

1430

1 440

1450

1460

1470

1480

1490

1 500

1510

1 520

1530

1540

1550

1 560

1570

1 580

1590

1600

1610

1 620

1 630

1 640

1 650

1660

1 670

1 680

1 690

1 700

1710

1 720

1730

1740

1750

1760

1770

1780

1790

1800

1810

1820

1830

1840

READ(5,*)PB0,TT0,CTT0,VT0

IP ( PBO . EQ . 0 . 0) PB0=30 .

0

IF(PBO.GT. 1 00. )PB0=PB0/33.867

IF ( TTO . EQ . 0 . 0) TTO=TRA

READ (5,*)(CT0(l), TFO (i), 1 = 1, 10)

IF ( TTO. LT. 40.0) THEN

DO 22 1=1 , 10

22 TFO ( I

) =CF ( TFO ( I )

)

END IF

IF (TTO.LT. 40. 0)TT0=CF(TT0)

WRITE(6,534)PB0,TT0,CTT0,VT0,CT0(1 ) ,TF0(1

)

WRITE( 6 , 535) (CTO(I) ,TFO(l) ,1=2,10)

535 FORMAT ( 34X , E7 • 2 , 2X , F5 • 1

)

3 IF ( ICRL . EQ . 1 . OR . ICRL . G-T . 3 ) GO TO 5

WRITE( 6 ,*) 'LOW FIRE OFF-LOSS DATA.’

if( icrl.eq. 3 ) write

(

6 , 533 ) READ ( 5

, * ) PBOR , TTOR , CTTOR , VTOR

IF ( PBOR . EQ . 0 . 0 ) PB0R=30 .

0

IF ( PBOR . GT . 1 00 . ) PB0R=PB0R/ 33. 867

IF ( TTOR . EQ . 0 . 0 ) TTOR=TRAR

READ ( 5

, * ) ( CTOR ( I )

, TFOR ( I )

, 1 = 1 ,10)

IF ( TTOR . LT . 40 . 0 ) THEN

DO 33 1=1,10

33 TF0R(I)=CF(TF0R(I)

)

END IF

IF ( TTOR . LT . 40 . 0 ) TT0R=CF ( TTOR)

WRITE( 6 , 534)PB0R, TTOR, CTTOR. VTOR, CT0R(1 ) ,TF0R(1

)

WRITE( 6 , 535) (CTOR(I) ,TF0R(I) ,1=2,10)

5 CONTINUE

C

C Calculate steady-state values

C

CALL SSLOSS ( IFUL , QJ , TRA , TSS , TFS , C02S , C02F

,

# HHV , AFRH , QLH , RTFH , QSSH , EFYSSH , SFRH

)

PF=QP/QIN

CJ=0.0

C If outdoor, assign CJ

IF (QJ.GT. 1 .0) C J=2 .

8

C

C Calculate reduced firing rate values.

C

IF (ICRL.EQ. 1 .OR. ICRL. GT. 3) GO TO 10

CALL SSLOSS ( IFUL , QJ , TRAR , TSSR , TFSR , C02SR , C02FR

,

# HHV , AFR , QL , RTFM , QSSM , EFYSSM , SFRM

)

CALL WGHT ( QIN , EFYSSH . QINR , EFYSSM

,

# RLOW , TOALO , TOAHI , TC

)

RHIGH= 1 . - RLOW

WRITE(6,540)RL0W,RHIGH,TC

540 F0RMAT(/3X, ’LOW HEAT FRACTION= ' , F5 . 3 , 3X ,

’ HIGH HEAT FRACTIONS,

# F5.3,/3X, 'BALANCE POINT TEMP . =

' , F5 . 2

)

C

C Weighted steady-state efficiency calculations.

C

1 0 EFYSSW=EFYSSH

IF ( ICRL .EQ. 1 .OR. ICRL .GT. 3)G0 TO 20

EFYSSA=EFYSSH

IF(ICRL.EQ.3)EFYSSA=(EFYSSH-EFYSSM)*(TC-T0AHI)/(TC-1 5. )+EFYS8 M

EFYSSW=RLOW*EFYSSM+RHIGH*EFYSSA

C

-A3-
1850

1860

1870

1880

1890

1 900

1910

1 920

1930

1940

1950

1 960

1970

1 980

1990

2000

2010

2020

2030

2040

2050

2060

2070

2080

2090

2100

21 10

21 20

21 30

21 40

21 50

21 60

21 70

21 80

21 90

2200

2210

2220

2230

2240

2250

2260

2270

2280

2290

2300

2310

2320

2330

2340

2350

2360

2370

2380

2390

2400

2410

2420

2430

C Optional tracer gas off-loss calculations.

C

20 IF( ICRL. GT . 3 * )G0 TO 60

IF ( IOPT .NE. 3) GO TO 30

IF ( ICRL .EQ. 3) GO TO 25

CALL LOSOFF ( PBO , TTO , CTTO , YTO , CTO , TFO , TON , QIN , TRA , TOAHI

,

# QSOFFH, QIOFFH)

IF ( ICRL.EQ. 1 ) GO TO 60

25 CALL LOSOFF ( PBOR , TTOR , CTTOR , YTOR , CTOR , TFOR , TON , QINR , TRAR , TOALO

,

§ QSOFFM, QIOFFM)

GO TO 60

C

C Calculate electro-mechanical damper factor.

C

30 IF(ISYS. LT. 5. OR. (ISYS.GT. 8. AND.ISYS.LT. 1 1 ))G0 TO 40

D0=1 .62*0 .-AD*C0S(PI*AN/180. )/AS)

IF (DO . GT . 1 . 0)D0=1 .0

IF ( DO . LT . 0 . 0)D0=0 .

0

WRITE( 6 , 555 ) AS, AD, AN, DO

555 FORMAT (/2X, 'As=’ ,F5 . 2 , 3X, ' Ad= • ,F5 • 2 , 3X, ’An=' ,F4.1 ,3X, 'Do=' ,F4.2)

C

C ASSIGN TABLE VALUES FOR DF AND DS

C

40 DF=CDF( ISYS

)

IF ( ISYS .GT. 1 0)DF=DF*D0

DS=CDS ( ISYS

)

IF ( DS .LT. 0 . )DS=DO

IF ( ISYS . EQ . 8)DS=D0*DF

C

C OPTIONAL PROCEDURE FOR CALCULATING DP,DS AND DF

C

50

C

C

C

C

IF ( IOPT .NE. 2) GO TO 50

Z0FF=1 .325*PB*VT*(CTT-CT)/(CT*(TT+460. )

)

ZFSS=ZOFF

IF ( IFUL . GT . 2 ) ZFSS=ZOFF* ( ( TFS-TRA ) / ( TF-TRA )

) ** . 56

§ *( (TF+460. )/(TFS+460. ) )**1 . 1

9

ZSS=QIN* ( RTFH*AFR+1 . ) /HHV

DP=ZFSS/ ZSS

DF=DP

IF ( ISYS .GT.

IF ( ISYS .GT.

IF (ISYS .LT.

IF ( ISYS .EQ.

IF(ISYS .EQ.

IF (ISYS .GT.

IF(ISYS .GT.

# (D0*SFRH-1 . )/ (SFRH-1

CONTINUE

1 o)df=dp*do

8) GO TO 50

3 )DS=1

.

3 -OR. ISYS .EQ.

5 .OR. ISYS .EQ.

6 .AND. ( DO*SFRH

6 .AND. (DO*SFRH

.)

4)DS=(DP+.79)/l .4

6 )DS=DO

.LT. 1 . ) )DS=DP*DO

.GE. 1 . ))DS=DP*DO+( .85-DP*D0)*

Calculate AFUE, no thermal damper or off-loss measure

and not manual controls.

IF ( DF . GT . 1 . 0 )DF=1 .0

if(ds.gt. 1 . 0 )DS=1 .0

WRITE(6,560)DF,DS

560 FORMAT ( /2X , 'Df=' ,F4.2,3X, 'Ds=' ,F4.2)

AFUE= . 968*EFYSSW-1 .78*DF-1 . 89*DS-1 29 . *PF-3 • 93*QJ+1 .81

GO TO 1000

C

-A4-
2440

2450

2460

2470

2480

2490

2500

2510

2520

2530

2540

2550

2560

2570

2580

2590

2600

2610

2620

2630

2640

2650

2660

2670

2680

2690

2700

2710

2720

2730

2740

2750

2760

2770

2780

2790

2800

2810

2820

2830

2840

2850

2860

2870

2880

2890

2900

2910

2920

2930

2940

2950

2960

2970

2980

2990

3000

3010

3020

C Continue calculations for manual control, thermal

damper, or measured off-losses.

C

C Calculate on-cycle losses.

C

60 QS0N=QSSH

C I0NH= 1 00 . * . 24*SFRH* . 7* (

1 . +RTFH*AFR ) /HHY

QI0N=CI0NH*( 70

.

-45 •

)

IF( ICRL.EQ. 1 )G0 TO 70

IF( ICRL. GT . 3) THEN

C Calculate psudo cycling loss for manual controls.

EFFYU=EFYSSW-QI0N

WRITE( 6 , 570) QION

570 F0RMAT(/2X, ’Li ,on=' ,F5-2)

GO TO 90

END IF

C Calculate for two stage or modulating controls.

QSSA=QSSH

IF(ICRL.EQ.3)QSSA=(QSSH-QSSM)*(TC-T0AHI)/(TC-1 5- )+QSSM

QSON=RLOW*QSSM+RHIGH*QSSA

C I0NM=1 00 . *

.

24*SFRM* . 7* ( 1 . +RTFM*AFR ) /HHV

CI0NA=CI0NH

IF (ICRL.EQ. 3 )CI0NA=(CI0NH+CI0NM)/2.

QION=RL0W*C I ONM*

(

70 . -T0AL0 ) +RHIGH*CI0NA* ( 70 . -TOAHI ) C

C Calculate off-cycle losses.

C

C For two stage controls.

QS0FF=RL0W*QS0FFM

QI0FF=RL0W*QI0FFM

IF (ICRL .EQ. 3 )G0 TO 80

C For step modulating controls.

QS0FF=QS0FF+RHIGH*QS0FFH

QI0FF=QI0FF+RHIGH*QI0FFH

GO TO 80

C For single stage controls.

70 QS0FF=QS0FFH

QI0FF=QI0FFH

C

C Calculate cycling, part-load, efficiency.

C

80 EFFYU=1 00

.

-QL-C J*QJ-T0N* ( QSON+QSOFF+QION+QIOFF ) / ( T0N+PF*T0FF ) WRITE (6

,

580 )QS0N, QION, QSOFF, QIOFF

580 FORMAT

(

3X, 'Ls, on =

' ,F5 . 2 , 6X ,

’ Li , on =',F5.2

# /3X,

Ls , off=

’ ,F5 • 2 , 6X, ’Li,off=’ ,F5-2

C

C Calculate AFIJE.

90 IF( ICRL.EQ. 4) QIN=QIN*2.0

AFUE=4400 . *EFYSSW*EFFYU*Q IN /

(

4400

.

*EFYSSW*QIN+

# 2. 5*4600. *EFFYU*QP)

C

C Calculate electric power.

C

1000 IF(ICRL.EQ. 1

.

OR . ICRL . GT .

3

) GO TO 1010

PE=PE*1 .3

IF ( ICRL . EQ .

2

) GO TO 1010

FR=QIN/QINR

PE=PE*1 .7

IF ( FR . GE . 0 .

7

) PE=PE*1 .4

-A5-
3620

3630

3640

3650

3660

3670

3680

3690

3700

3710

3720

3730

3740

3750

3760

3770

3780

3790

3800

3810

3820

3830

3840

3850

3860

3870

3880

3890

3900

3910

3920

3930

3940

3950

3960

3970

3980

3990

4000

4010

4020

4030

4040

4050

4060

4070

4080

4090

4100

N=1

DO 10 1=1,16

10 IF ( RATIO .GE. CHECK(l) .AND. RATIO .LT. CHECK(l+l)) N=I

RLOW=RLO(N)

TOALO=TOAL(N)

TOAHI=TOAH(N)

RETURN

END

C

C *** CALCULATION OF HHV AFR QL RTF SFR QSSS EFYSS *** SUBROUTINE SSLOSS ( IFUL , QJ , TRA , TSS , TFS , C02S , C02F

,

# HHV, AFR, QL, RTF, QSSS, EFYSS, SFR)

DIMENSION HH(6),AF(6),Q(6),A(6),B(6),C(6),D(6)

DATA ( HH ( J ) ,J=1 ,6)/l 9800. ,19500. , 201 20 ., 1 8500 ., 21 500 ., 20890 .

/

DATA (AF(J),J=1 ,6)/l 4. 56, 14.49, 14.45, 11 .81 ,15.58,15.36/

DATA (Q(J),J=1 , 6) /6. 55, 6. 50, 9. 55, 10. 14, 7. 99, 7. 79/

DATA (A(K) , K=1 ,6)/. 0679, .06668, .09194, .09646, .0841 , .0808/

DATA (B(K) ,K=1 , 6 )/l 4. 22 , 1 4. 34, 1 0. 96 , 1 0. 1 0, 1 2. 60, 1 2. 93/

DATA (C(K) ,K=1 ,6)/. 01 79, .0181 , .0175, .01 55, .0177, .018/

DATA (D(K),K=1 ,6)/.1 67, .167, .171 , .235, .1 51 , .143/

hhv=hh( iful)

afr=af( iful)

ql=q(iful)

RTF=(B( IFUL) /C02F)+A( IFUL)

SFR=1 .0

IF(QJ.GT.O.O) SFR=0 .

0

IF( IFUL . LT . 3 ) SFR=1 .

4

IF( C02S . LT . 0 . 1 ) GO TO 10

C Calculate S/F for Hood or Diverter or measured Barometric damper.

RTS=(B( IFUL) /C02S)+ A(IFUL)

SFR = 1 .3*(RTS/RTF)

IF ( IFUL . LT . 3 ) SFR = RTS/RTF

10 CONTINUE

IF ( TSS . LT . 1 .0) THEN

C Calculate steady-state efficiency for units w/o diverters.

QSSS=C ( IFUL )*(RTF+D( IFUL) )*(TFS-TRA)

ELSE

C Calculate steady-state efficiency for units with diverters.

QSSS=C ( IFUL)* (RTS+D( IFUL) )*(TSS-TRA)

ENDIF

EFYSS=1 00 . -QL-QSSS

RETURN

END

C

C *** Convert deg. C to deg. F *** FUNCTION CF ( T

)

CF=T*1 .8 + 32.0

RETURN

END

-A7-
APPENDIX B

DOE TEST PROCEDURE

FEDERAL REGISTER

MARCH 28 , 1984

Sections pertaining to vented heatersPages 12156, 12157, and 12169 to 12178

Text and equations have Been rearranged to

be in continuous columns.

Appendix B DOE Test Procedure

136 Federal Register / Vol. 49, No. 61 / Wednesday, March 28. 1984 / Rules and Regulations

12157

PART 430—ENERGY CONSERVATION

PROGRAM FOR CONSUMER

PRODUCTS

Provisions of 10 CFR Part 430. § 430.2,

5 430.22. Appendix G, Appendix N. and

Appendix O are amended as follows:

product of: (A) The quotient of one

million Btu divided by the sum of: (7) The product of the maximum fuel input •

in Btu’s per hour as determined in 3.1.1 or 3.1.2 of Appendix 0 of this subpart

times the annual fuel utilization efficiency in percent as determined in

4.1.17, 4.2.6. or 4.3.7 of this appendix as appropriate divided by 100. plus [2] the product of the maximum electric power

in watts as determined in 3.1.3 of Appendix 0 of this subpart times the quantity 3.412; and (B) of the sum of: (1) the product of the maximum fuel input in Btu’s per hour as determined in 3.1.1 of

this appendix times the representative

unit cost in dollars per Btu for natural

gas. propane, or oil. as appropriate, as provided pursuant to section 323(b)(2) of

the Act: plus [2] the product of the maximum auxiliary electric power in kilowatts as determined in 3.1.3 of Appendix O of this subpart times the representative unit cost in dollars per

kilowatt-hour as provided pursuant to section 323(b)(2) of the Act the resulting

quantity shall be rounded off to the nearest 0.01 dollar per million Btu

(0) Vented home heating equipment

(1) The annual fuel utilization efficiency for vented home heating

equipment expressed in percent which. *

is the ratio of the annual fuel output of

useful energy delivered to the heated

space to the annual fuel energy input to the vented heater, shall be determined

either according to section 4.1.17 of Appendix O of this subpart for vented

heaters without either manual controls

or thermal stack dampers: according to section 4.2.6 of Appendix O of this subpart for vented heaters equipped

with manual controls; oraccording to section 4.3.7 of Appendix O of this subourt for vented heaters equipped

with thermal stack dampers.

(2)

The estimated operating cost per

miilion Btu output for rented heaters without an auxiliary > .trie system

shall be the product of: (i) One hundred:

(ii) the quotient of one million Btu output

divided by the annual fuel utilization efficiency as determined in paragraph

(o) (1) and (iii) the representative unit

cost in dollars per Btu for natural gas. propane, or oil. as appropriate, as provided pursuant to section 323(b)(2) of

the Act. the resulting product shall be

rounded to the nearest 0.01 dollar per

million Btu output.

(3)

The estimated operating cost per

million Btu output for gas or oil vented

home heating equipment with an

auxiliary electric system shall be the

output.

(4)

Other useful measures of energy consumption for vented home heating

equipment shall be those measures of energy consumption which the Secretary

determines are likely to assist consumers in making purchasing

decisions and which are derived from

the application of Appendix O of this subpart.

-B1 -
Federal Register / Vol. 49, No. 61 / Wednesday, March 28, 1984 / Rules and Regulations 12169

5. Appendix O to Subpart B of Part 430 is revised to read as follows: Appendix O to Subpart B of Part 430-

L’nifoon Test Method for Measuring the Energy Consumption of Vented Home

Heating Equipment

1.0 Definitions.

1.1 "Air shutter" means an adjustable device for varying the size of the primary air

inletfsj to the combustion chamber power

burner.

1.2 “Air tube” means a tube which carries combustion air from the burner fun to the burner nozzle for combustion.

1.3 “Earometic draft regulator or barometric damper" means a mechanical

device designed to maintain a constant draft

in a vented heater.

1.4 “Draft hood" means an external device which performs the same function as an integral draft diverter, as defined in .section 1.17 of this appendix.

1.5 "Electro-mechanical stack damper" means a type of stack damper which is operated by electrical and/or mechanical - means.

3.6 "Excess air" means air which passes

through the combustion chamber and the vented heater flues in excess of that which is theoretically required for complete

combustion.

1.7 “Flue” means a conduit between the

flue outlet of a vented heater and the integral draft diverter, draft hood, barometric damper

or vent terminal through which the flue gases pass pnor to .the point of draft relief. 1.8 "Flue damper" means a device

installed between the furnace and the

integral draft diverter, draft hood, barometric

draft regulator, or vent terminal which is not equipped with a draft control device,

designed to open the venting system when

the appliance is in operation and to close the venting system when the appliance is in a 6tandby condition.

1.9 “Flue gases” means reaction products

resulting from the combustion of a fuel with

the oxygen of the air, including the inerts and any excess air. 1.10 "Flue losses" means the sum of

sensible and latent heat losses above room

temperature of the flue gases leaving a vented heater.

1.11 “Flue outlet" means the opening

provided in a vented heater for the exhaust of

the flue gases from the combustion chamber.

1.12 "Heat input" (Q,„) means the rate of energy supplied in a fuel to a vented heater

operating under steady-slate conditions,

expressed in Btu's per hour. It includes any

input energy to the pilot light and is obtained by multiplying the measured rate of fuel consumption by the measured higher heating value of the fueL

1.13 "Heating capacity” (Q^,,) means the

rate of useful heat output from a vented

heater, operating under steady-state

conditions, expressed in Btu's per hour. For room and wall heaters, it is obtained by

multiplying the “heat input" (Q,n) by the steady-state efficency (tjm) divided by 100. For floor furnaces, it is obtained by -

multiplying (A) the "heat input" (Q,„) by (B) the steady-state efficiency divided by 100, minus the quantity (2.8) (L,) divided by 100,

where L, is the jacket loss as determined in section 3.2 of this appendix.

1.14 "Higher heating value" (HHV) means

the heat produced per unit of fuel when

complete combustion takes place at constant

pressure and the products of combustion are cooled to the initial temperature of the fuel and air and when the water vapor formed

during combustion is condensed. The higher

heating value is usually expressed in Btu's per pound, Btu’s per cubic foot for gaseous

fuel, or Btu's per gallon for liquid fuel. 1.15 "Induced draft" means a method of drawing air into the combustion chamber by

mechanical means.

1.16 "Infiltration parameter" means that portion of unconditioned outside air drawn

into the heated space as a consequence of

loss of conditioned air through the exhaust system of a vented heater.

1.17 “Integral draft diverter" means a device which is an integral part of a vented

heater, designed to: (1) Provide for the exhaust of the products of combustion in the event of no draft, back draft, or steppage

beyond the draft diverter. (2) prevent a back

draft from entering the vented heater, and (3) neutralize the stack action of the chimney or gas vent upon the operation of the vented

heater.

1.18 “Manually controlled vented

heaters” means either gas or oil fueled vented

heaters equipped without thermostats.

1.19 "Modulating control” means either a

step-modulating or two-stage control. 1-20 "Power burner" means a vented

heater burner which supplies air for combustion at a pressure exceeding

atmospheric pressure, or a burner which

depends on the draft induced by a fan incorporated in the furnace for proper

operation.

1.21 "Reduced heat input rate" means the factory adjusted lowest reduced heat input

rate for vented home heating equipment

equipped with either two stage thermostats

or step-modulating thermostats.

1.22 "Single stage thermostat” means a thermostat that cycles a burner at the maximum heat input rate and off. 1.23 "Stack" means the portion of the exhaust Bystem downstream of the integral

draft diverter, draft hood or barometric draft regulator.

1.24 "Stack damper" means a device

installed downstream of the integral draft

diverter, draft hood, or barometric draft regulator, designed to open the venting

system when the appliance is in operation

and to close off the venting system when the appliance is in the standby condition.

1.25 "Stack gases" means the flue gases combined with dilution air that enters at the

integral draft diverter, draft hood or barometric draft regulator. 1.26 "Steady-state conditions for vented home heating equipment" means equilibrium conditions as indicated by temperature

variations of not more than 5“ F (2.8C) in the

flue gas temperature for units equipped with

draft hoods, barometric draft regulators or

direct vent systems, in three successive readings taken 15 minutes apart or not more

than 3* F (1.7C) in the stack gas temperature

for units equipped with integral draft diverters in three successive readings taken

15 minutes apart

1.27 "Step-modulating control" means a control that either cycles off and on at the low input if the heating load is light, or gradually, increases the heat input to meet

any higher heating load that cannot be met

with the low firing rate. 1.28 ‘Thermal stack damper" means a

type of stack damper which is dependent for operation exclusively upon the direct conversion of thermal energy of the stack gases into movement of the damper plate. 1.29 "Two stage control" means a control

that either cycles a burner at the reduced

heat input rate and off or cycles a burner at the maximum heat input rate and off. 1.30 “Vaporizing-type oil burner" means a device with an oil vaporizing bowl or other

receptacle designed to operate by vaporizing

liquid fuel oil by the heat of combustion and

mixing the vaporized fuel with air. 1.31 "Vent/air intake terminal" means a device which is located on the outside of a building and is connected to a vented heater by a system of conduits. It is composed of an

air intake terminal through which the air for combustion is taken from the outside atmosphere and a vent terminal from which

flue gases are discharged.

1.32 "Vent limiter" means a device which

limits the flow of air from the atmospheric

diaphragm chamber of a gas pressure

regulator to the atmosphere. A vent limiter may be a limiting orifice or other limiting device.

1.33 “Vent pipe" means the passages and

conduits in a direct vent system through

which gases pass from the combustion

chamber to the outdoor air. 2.0 Testing conditions.

2.1 Installation of test unit

2.1.1 Vented wail furnaces {including

direct vent systems). Install gas fueled vented

wall furnaces for test as specified in sections

2.1.3 and 2.1.4 of ANSI Z21.49-1975. Install gas fueled wall furnaces with direct vent systems for test as described in sections 2.1.3 and 2.1.4 of ANSI Z21.44-1973. Install oil fueled vented wall furnaces as specified in UL-730-1974, section 33. Install oil fueled vented wall furnaces with direct vent systems as specified in UL-730-1974, section

34. • ; 2.1.2 Ventedfloor furnaces. Install vented

floor furnaces for test as specified in sections

35.1 through 35.5 of UL^-729-1978.

2.1.3 Vented room heaters. Install in accordance with manufacturer's instructions.

2.2 Flue and stack requirements.

2.2.1 Gas fueled vented home heating

equipment employing integral draft diverters and draft hoods (excluding direct vent systems). Attach to. and vertically above the

outlet of gas fueled vented home heating

equipment employing draft diverters or draft hoods with vertically discharging outlets, a

five (5) root long test stack having a cross

sectional area the same size as the draft diverter outlet. Attach to the outlet of vented heaters having a horizontally discharging draft diverter or draft hood outlet a 90 degree

elbow, and a five (5) foot long vertical test stack. A horizontal section of pipe may be

used on the floor furnace between the diverter and the elbow if necessary to clear

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12170 Federal Register / Vol. 49. No. 61 / Wednesday. March 28. 1984 / Rules and Regulations

an) framing used in the installation. Use the minimum length of pipe possible for this section. Use stack, elbow, and horizontal

section with same cross sectional area as the diverter outlet.

2.2.2 Oil fueled vented home heating

equipment (excluding direct vent systems). Use flue connections for oil fueled vented

floor furnaces as specified in section 35 of UL

“29-1976. sections 34.10 through 34.18 of UL

730-1974 for oil fueled vented wall furnaces and sections 36 2 and 36.3 of UL 896-1973 for

oil fueled vented room heaters.

2.2.3 Direct vent systems. Have the e\hausl/nir intake system supplied by the manufacturer in place during all tests. Test

units intended for installation with a variety

of vent pipe lengths with the minimum length

recommended by the manufacturer. Do not connect a hpater employing a direct vent system to a chimney or induced draft source. Vent 'he ga3 solely on the provision for venting incorporated in the heater and the vent/air intake system supplied with it. 2.3 Fuel supply.

2.3

1

Natural gas. For a vented heater

utilizing natural gas, maintain the gas supply

.o the unit under test at a normal inlet test pressure immediately ahead of all controls at

7 to 10 inches water column. Maintain the regulator outlet pressure at normal test pressure approximately at that recommended

hy the manufacturer. Use natural gas having

a specific gravity of approximately 0.65 and a higher heating value within ± 5 percent of

1.025 Btu's per standard cubic foot. Determine

the actual higher heating value in Btu’s per standard cubic foot for the natural gas to be

used in the test with an error no greater than one percent.

2.3.2 Propane gas. For a vented heater

utilizing propane gas. maintain the gas supply

to the unit under test at a normal inlet pressure of 11 to 13 inches water column and

a specific gravity of approximately 1.53. Maintain the regulator outlet pressure, on

units so equipped, approximately at that recommended by the manufacturer. Use

propane having a specific gravity of approximately 1.53 and a higher heating value within ± 5 percent of 2,500 Btu’s per standard cubic foot. Determine the actual higher heating value in Btu’s per standard

cubic foot for the propane to be used in the

test with an error no greater than one

percent.

2.3.3 Other test gas. Use other test gases

with characteristics as described in section

2.2. table VII. of ANSI Standard Z21.ll.l1974. Use gases with a measured higher

heating value within ± 5 percent of the values specified in the above ANSI standard. Determine the actual higher heating value of

the gas used in the test with an error no

greater than one percent.

2.3.4 Oil supply. For a vented heater

utilizing fuel oil. use No. 1. fuel oil (kerosene)

for vaporizing-type burners and either No. 1 or No. 2 fuel oil. as specified by the manufacturer, for mechanical atomizing type

burners. Use No. 1 fuel oil with a viscosity

meeting the specifications as specified in UL730-1974. section 36.9. Use test fuel conforming to the specifications given in tables 2 and 3 of ANSI Standard Z91.1-1972

for No. 1 and No. 2 fuel oil. Measure the higher heating value of the test fuel with an

error no greater than one percent.

2.3.5

Electrical supply. For auxiliary

electric components of a vented heater, maintain the electrical supply to the test unit within one percent of the nameplate voltage

for the entire test cycle. If a voltage range is used for nameplate voltage, maintain the

electrical supply within one percent of the mid-point of the nameplate voltage range.

2.4 Burner adjustments.

2.4.1 Gas burner adjustments. Adjust the burners of gas fueled vented heaters to their maximum Btu ratings at the test pressure

specified in section 2.3 of this appendix.

Correct the burner volumetric flow rate to 60° F (15. 6C) and 30 inches of mercury barometric

pressure, set the fuel flow rate to obtain a heat rate of within ±2 percent of the hourly Btu rating specified by the manufacturer as measured after 15 minutes of operation

starting with all parts of the vented heater at room temperature. Set the primary air shutters in accordance with the manufacturer's recommendations to give a good flame at this adjustment. Do not allow

the deposit of carbon during any test specified herein.

If a vent limiting means is provided on a gas pressure regulator, have it in place during

all tests. For gas fueled heaters with modulating

controls adjust the controls to operate the heater at the maximum fuel input rate. Set the thermostat control to the maximum setting. Start the heater by turning the safety control valve to the “on" position. In order to prevent

modulation of the burner at maximum input

place the thermostat sensing element in a temperature control bath which is held at a temperature below the maximum set point

temperature of the control. For gas fueled heaters with modulating

controls adjust the controls to operate the heater at the reduced fuel input rate. Set the thermostat control to the minimum setting. Start the heater by turning the safety control valve to the "on" position. If ambient test room temperature is above the lowest control

set point temperature, initiate burner

operation by placing the thermostat sensing element in a temperature control bath that is held at a temperature below the minimum set point temperature of the control.

2.4.2 Oil burner adjustments. Adjust the burners of oil fueled vented heaters to give

the COj reading recommended by the manufacturer and an hourly Btu input, during

the steady-state performance test described below, which is within ±2 percent of the heater manufacturer's specified normal

hourly Btu input rating. On units employing a power burner do not allow smoke in the flue to exceed a No. 1 smoke during the steadystate performance test as measured by the procedure in ANSI Standard Zll.182-1965

(R1971) (ASTM D 2156-65 (1970)). If. on units employing a power burner, the smoke in the

flue exceeds a No. 1 smoke during the steadystate test, readjust the burner to give a lower smoke reading, and. if necessary a lower COj

reading, and start all tests over. Maintain the average draft over the fire and in the flue during the steady-state performance test at that recommended by the manufacturer

within .-to. 005 inches of water gauge. Do nol make additional adjustments to the burner

during the required series of performance

tests. The instruments and measuring

apparatus for this test are described >n section 6.3 of ANSI standard Z91. 1-1972.

2.5 Circulating air adjustments.

2.5.1 Forced air vented wall furnaces

(including direct vent systems). During tests maintain the air flow through the heater as

specified by the manufacturer and operate

the vented heater with the outlet air temperature between 80° F and 130° F above room temperature. If adjustable air discharge

registers are provided, adjust them so as to •provide the maximum possible air restriction. Measure air discharge temperature as

specified in section 2.14 of ANSI Z21.49-1975.

2.5.2 Fan type vented room heaters and

floor furnaces. During tests on fan type furnaces and heaters, adjust the air flow

through the heater as specified by the manufacturer. If adjustable air discharge

registers are provided, adjust them to provide

the maximum possible air restriction.

2.6 Location of temperature measuring

instrumentation.

2.6.1

Gas fueled vented home heating

equipment (including direct vent systems). For units employing an integral draft diverter,

install nine thermocouples, wired in parallel,

in a horizontal plane in the five foot test stack located one foot from the test stack

inlet. Equalize the length of all thermocouple

leads before paralleling. Locate one

thermocouple in the center of the stack. Locate eight thermocouples along imaginary

lines intersecting at right angles in this horizontal plane at points one third and two

thirds of the distance between the center of

the stack and the stack wall. For units which employ a direct vent

system, locate at least one thermocouple at the center of each flue way exiting the heat

exchanger. Provide radiation shields if the thermocouples are exposed to burner

radiation. For units which employ a draft hood or

units which employ a direct vent system

which does not significantly preheat the incoming combustion air. install nine thermocouples, wired in parallel, in a horizontal plane located within 12 inches

(304.8 mm) of the heater outlet and upstream

of the draft hood on units so equipped. Locale one thermocouple in the center of the pipe

and eight thermocouples along imaginary

lines intersecting at right angles in this horizontal plane at points one third and two

thirds of the distance between the center of the pipe and the pipe wall. For units which employ direct vent systems

that significantly preheat the incoming

combustion air, install nine thermocouples, wired in parallel, in a plane parallel to and

located within 6 inches (152 4 mm) of the vent/air intake terminal. Equalize the length

of all thermocouple leads before paralleling Locate one thermocouple in the center of the vent pipe and eight thermocouples along

imaginary lines intersecting at right angles In

this plane at points one third and two thirds of the distance between the center of the flue pipe and the pipe wall.

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Federal Register / Vol. 49, No. 61 / Wednesday, March 28, 1984 / Rules and Regulations 12171

iri ummiiiBi mmiu ——

mmmm———bi—w——wwmmmarm wm aww—ht——— iwwp—ww—w«—

Use bead-type thermocouples having wire

size not greater than No. 24 American Wire

Gauge (AWG). If there is a possibility that the thermocouples could receive direct radiation from the fire, install radiation

shields or. the fire side of the thermocouples

only and position the shields so that they do

not touch the thermocouple junctions.

Install thermocouples for measuring

conditioned warm air temperature as

described in ANSI Z21.49-1975, section 2 14. Establish the temperature of the inlet air by means of single No. 24 AWG bead-type

thermocouple, suitably shielded from direct radiation and located in the center of the plane of each inlet air opening.

2.6.2

Oil fueled vented home heating

equipment (including direct vent systems).

Install nine thermocouples, wired in parallel and having equal length leads, in a plane

perpendicular to the axis of the flue pipe. Locate this plane at the position shown in Figure 34.4 of UL 730-1974, or Figures 35.1 and 35.2 of UL 729-1976 for a single

thermocouple, except that on direct vent systems which significantly preheat the incoming combustion air, it shall be located within 6 inches (152.5 mm) of the outlet of the vent/air intake terminal. Locate one

thermocouple in the center of the flue pipe

and eight thermocouples along imaginary

lines intersecting at right angles in this plane

at points one third and two thirds of the distance between the center of the pipe and

pipe wall. Use bead-type thermocouples having a wire size not greater than No. 24 AWG. If there is a possibility that the thermocouples

could receive direct radiation from the fire, install radiation shields on the fire side of the thermocouples only and position the shields so mat they do not touch the thermocouple

junctions.

Install thermocouples for measuring the conditioned warm air temperature as

described in sections 35.12 through 35.17 of UL 730-1974. Establish the temperature of the

inlet air by means of a single No. 24 AWG

bead-type thermocouple, suitably shielded from direct radiation end located in the center of the plane of each inlet air opening.

2.7 Combustion measurement

instrumentation. Analyze the samples of stack and flue gases for vented heaters to determine the concentration by volume of carbon dioxide present in the dry gas with

instrumentation which will result in a reading

having an accuracy of ±C.l percentage

points.

2.8 Energy flow instrumentation. Install one or more instruments, which measure the

rate of gas flow or fuel oil supplied to the vented heater, and if appropriate, the

electrical energy with an error no greater than one percent.

2.9 Room ambient temperature. During

the time period required to perform all the

testing and measurement procedures

specified in section 3.0 of this appendix,

maintain the room temperature within ±5° F

(1.2. 8C) of the value THA measured during the steady-state performance test. At no time during these tests shall the room temperature exceed 100' F (37.8C) or fall below 65° F

(1 3.3C). Temperature (TRA ) shall be the arithmetic average temperature of the test area.

determined by measurement with four No. 24 AWG bead-type thermocouples with

junctions shielJed'agciirist radiation, located approximately at 90-degree positions on a

circle circumscribing the heater or heater enclosure under test, in a horizontal plane

approximately at the vertical midpoint of the appliance or test enclosure, and with the junctions approximately 24 inches from sides of the heater or test enclosure and located so

as not to be affected by other than room air. Locate a thermocouple at each elevation of

draft relief inlet opening and combustion air

inlet opening at a distance of approximately

24 inches from the inlet openings. The

temperature of the air for combustion and the

air for draft relief shall not differ more than ±5* F from room temperature as measured

above.

2.10

Equipment used to measure mass

flow rate in flue and stack. The tracer gas chosen for this task should have a density

which is less than or approximately equal to the density of air. Use a g3s unreactive with

the environment to be encountered. Using

instrumentation of either the batch or continuous type, measure the concentration

of tracer gas with an error no greater than 2 percent of the value of the concentration measured.

3.0 Testing and measurements.

3.1 Steady-state testing.

3.1.1 Gas fueled vented home heating

equipment (including direct vent systems).

Set up the vented heater as specified in sections 2.1. 2.2. and 2.3 of this appendix. The

draft diverter shall be in the normal open

condition and the stack shall not be

insulated. (Insulation of the stack is no longer

required for the vented heater test.) Begin the steady-state performance test by operating

the burner and the circulating air blower, on

units so equipped, with the adjustments

specified by sections 2.4.1 and 2.5 of this eppendix. until steady-state conditions are

attained as indicated by a temperature

variation of not more than 3'F (1.7 C) in the stack gas temperature for vented heaters equipped with draft diverters or 5‘F (2.8 C) in the flue gas temperature for vented heaters equipped with either draft hoods or direct vent systems; in three successive readings taken 15 minutes apart. On units employing draft diverters, measure the room temperature (T**) as described in section 2.9 of this appendix and

measure the steady-state stack gas temperature HY^) using the nine thermocouples located in the 5 foot test stack

as specified in section 2.6.1 of this appendix. Secure a sample of the stack gases in the plane where TJ SS is measured or within 3.5

feet downstream of this plane. Determine the concentration by volume of carbon dioxide

(Xco*s) present in the dry stack gas. If the location of the gas sampling differs from the temperature measurement plane, there shall be no air leaks through tiie stack between

these two locations. On units employing draft hoods or direct vent systems, measure the room temperature

(TrjJ as described in section 2.9 or this appendix and measure the steady-state flue gas temperature (TF ,ss). using the nine thermocouples located in the Rue pipe as described in section 2.6.1 of this appendix.

Secure a sample of the flue gas in the plane of temperature measurement and determine the concentration by volume of CO? (X,„; F ) present in dry flue gas. In addition, for units employing draft hoods, secure a sample of the stack gas in a horizontal plane in the five fool

test stack located one foot from the test stack

inlet; and determine the concentration by volume of CO? (Xu^s) present in dry stack

gas.Determine the steady-state heat input rate (Qln ) including pilot gas by multiplying the measured higher heating value of the test gas by the steady-state gas input rate corrected

to standard conditions of 60'F and 30 inches

of mercury. Use measured values of gas temperature and pressure at the meter and

the barometric pressure to correct the metered gas flow rate to standard conditions. After the above test measurements have been completed on units employing draft

diverters, secure a sample of the flue gases at the exit of the heat exchangers) and

determine the concentration of CO? (Xca?r) present. In obtaining this sample of flue gas, move the sampling probe around or use a sample probe with multiple sampling ports in order to assure that an average value is obtained for the CO? concentration. For units with multiple heat exchanger outlets, measure the CO? concentration in a sample

from each outlet to obtain the average CO*

concentration for the unit. A manifold

(parallel connected sampling tubes) may be used to obtain this sample. For heaters with single stage thermostat

control (wall mounted electric thermostats), determine the steady-state efficiency at the maximum fuel input rate as specified in section 2.4 of this appendix. For gas fueled vented heaters equipped

with either two stage thermostats or step- modulating thermostats, determine the steady-state efficiency at the maximum fuel input rate, as specified in section 2.4.1 of this appendix, and at the reduced fuel input rate, as specified in section 2.4.1 of this appendix. For manually controlled gas fueled vented

heaters, with various input rates determine

the steady-state efficiency at a fuel input rate that is within ±5 percent of 50 percent of the maximum fuel input rate. If the heater is designed to use a control that precludes

operation at other than maximum output

(single firing rate) determine the steady state efficiency at the maximum input rate only.

3.1

.2

0/7 fueled vented home heating

equipment (including direct vent systems). Set up and adjust the vented heater as

specified in sections 2.1. 2.2. and 2.3.4 of this appendix. Begin the steady-state performance

test by operating the burner and the

circulating air blower, on units so equipped, with the adjustments specified by sections

2.4.2

and 2.5 of this appendix.until steadystate conditions are attained as indicated by

a temperature variation of not more than 5 F

(2.8 C) in the flue gas temperature in three successive readings taken 15 minutes apart. Do not allow smoke in the flue, for units equipped with power burners, to exceed a No. 1 smoke during the steady-state

performance test as measured by the procedure described in ANSI standard

Zll. 182-1965 (R1971) (ASTM D 2156-65

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| 12172 Federal Register / Vol. 49, No. 61 / Wednesday, March 28. 1984 / Rules and Regulations

| (ly'O)). Maintain the average draft over the

! fire and in the breeching during the steadystate performance test at that recommended

! by the manufacturer ±0.005 inches of water

, 8>'use- Measure the room temperature (Tra) as described in section 2 9 of this appendix and

measure the steady-state flue gas temperature (T, u) using nine thermocouples

located in the flue pipe as described in section 2 6.2 of this appendix. Secure a sample of the flue gas in the plane of temperature measurement and determine the concentration by volume of C03 (Xco:F) present in dry flue gas. Measure and record

the steady-state heat input rate (Q,„). For manually controlled oil fueled vented

heaters, determine the steady-state efficiency

at a fuel input rate that is within ±5 percent

of 50 percent of the maximum fuel input rate.

3.1.3 Auxiliary Electric Power

Measurement Allow the auxiliary electrical system of a gas or oil vented heater to operate for at least five minutes before

recording the maximum auxiliary electric power measurement from the wattmeter. Record the maximum electric power (Pr) expressed in kilowatts. For vented heaters

with modulating controls, the recorded (PE ) shall be maximum measured electric power

multiplied by the following factor (R). For two . stage controls. R = 1.3. For step modulating

controls. R = 1.4 when the ratio of minimumto-maximum fuel input is greater than or equal to 0.7, R = 1.7 when the ratio of m'mimum-to-maximum fuel input is less than

0.7 and greater than or equal to 0.5, and R=2.2 when the ratio of minimum-tomaximum fuel input is less than 0.5. 3.2 Jacket loss measurement. Conduct a

jacket loss test for vented floor furnaces. Measure the jacket loss (Lj) in accordance

with the ANSI standard Z21 .48-1976 section

2.12. 3.3 Measurement of the off-cycle losses for vented heaters equipped with thermal

stack dampers. Install the thermal stack damper according to the manufacturer's

instructions. Unless specified otherwise, the thermal stack damper should be at the draft diverter exit collar. Attach a five foot length

of bare stack to the outlet of the damper.

Install thermocouples as specified in section

2.0. 1 of this appendix.

For vented heaters equipped with single stage thermostats, measure the off-cycle losses at the maximum fuel input rate. For

vented heaters equipped with two stage

thermostats, measure the off-cycle losses at the maximum fuel input rate and at the reduced fuel input rate. For vented heaters equipped with step-modulating thermostats, measure the off-cycle losses at the reduced

fuel input rate. Let the vented heater heat up to a steadystate condition. Feed a tracer gas at a constant metered rate into the stack directly above and within one foot above the stack damper. Record tracer gas flow rate and

temperature. Measure the tracer gas

concentration in the stack at several

locations in a horizontal plane through a cross section of the stack at a point

. sufficiently above the stack damper to ensure

that the tracer gas is well mixed in the stack. Continuously measure the tracer gas

concentration and temperature during a 10

minute cool down period. Shut the burner off and immediately begin measuring tracer gas

concentration in the stack, stack temperature, room temperature, and barometric pressure. Record these values as the midpoint of each one-minute interval between burner shut- down and ten minutes after burner shut down. Meter response time and sampling

delay time shall be considered in timing these measurements.

3.4 Measurement of the effectiveness of

electro-mechanical stack dampers. For vented heaters equipped with electro- mechanical stack dampers, measure the cross

sectional area of the stack (AJ, the net area

of the damper plate (A„), and the angle that the damper plate makes when closed with a plane perpendicular to the axis of the stack

(fi). The net area of the damper plate means

the area of the damper plate minus the area

of any holes through the damper plate.

3.5 Pilot light measurement. Measure the energy input rate to the pilot light (Qp) with an error no greater than 3 percent for vented

heaters so equipped.

3.6 Optional procedure for determining

Dp Df and D„ for systems for all types of vented heaters. For all types of vented

heaters. Dc

- DF- and Ds can be measured by

the following optional cool down test. Conduct a cool down test by letting the unit heat up until steady-state conditions are reached, as indicated by temperature

variation of not more than 5°F (2 8°C) in the

flue gas temperature in three successive readings taken 15 minutes apart, and then

shutting the unit off with the stack or flue damper controls by-passed or adjusted so thatlhe stack or flue damper remains open

during the resulting cool down period. If a draft was maintained or. oil fueled units in the flue pipe during the steady-state

performance test described in section 3.1 cf

this appendix, maintain the same draft (within a range of —.001 to +.005 inches of water gauge of the average steady-state

draft) during this cool down period. Measure the flue gas mass flow rate (mF. OFF) during the cool down test described above at a specific off-period flue gas temperature and corrected to obtain its value

at the steady-state flue gas temperature

(Tr, ss), using the procedure described below. Within one minute after the unit is shut off to start the cool down test for determining Dp, begin feeding a tracer gas into the combustion chamber at a constant flow rate of VT , and at a point which will allow for the best possible mixing with the air flowing

through the chamber. (On units equipped

with an oil fired power burner, the best location for injecting this tracer gas appears

to be through a hole drilled in the air tube.) Periodically measure the value of VT with an

instantaneously reading flow meter having an

accuracy of ±3 percent of the quantity measured. Maintain VT at less than 1 percent

of the air flow rate through the furnace. If a combustible tracer gas is used, there should be a delay period between the time the burner gas is shut off and the time the tracer gas is first injected to prevent ignition of the tracer gas. Between 5 and 6 minutes after the unit is shut off to start the cool down test, measure

at the exit of the heat exchanger the average

flue gas temperature, T* r.on- At the same

instant the flue gas temperature is measured,

also measure the percent volumetric concentration of tracer gas Cr in the flue gas

in the same plane where T* r on is determined. Obtain the concentration of tracer gas using an instrument which will result in an accuracy of ±2 percent in the value of CF measured. If use of a continuous reading type instrument results in a delay time between

drawing of a sample and its analysis, this delay should be taken into account so that the temperature measurement and the measurement of tracer gas concentration

coincide. In addition, determine the temperature of the tracer gas entering the flow meter (Tt ) and the barometric pressure

(PB ). The rate of the flue gas mass flow through

the vented heater and the factors DF. Dp. and Ds are calculated by the equajions in sections

4.5.1

through 4.5.3 of this appendix.

4.0 Calculations.

4.1 Annual fuel utilization efficiency for gas or oil fueled vented home heating

equipment equipped without manual control's and without thermal stack dampers. The

following procedure determines the annual

fuel utilization efficiency for gas or oil fueled vented home heating equipment equipped

without manual controls and without thermal

stack dampers.

4.1.1 System number. Obtain the system

number from Table 1 of this appendix.

4.1.2 Off-cycle fluegas draft factor. Based

on the system number, determine the off- cycle flue gas draft factor (Df) from Table 1 of

this appendix.

4.1.3 Off-cycle stack gas draft factor. Based on the system number, determine the

off-cycle stack gas draft factor (D,) from Table 1 of this appendix.

4.1.4 Pilot fraction. Calculate the pilot fraction (PF) expressed as a decimal and

defined as: Pf = Qp/Qi»

where: QP = as defined ir. J 5 of this appendix

Qm = as defined in 3.1 of this appendix at the maximum fuel input rate

4.1.5 Jacket loss for floor furnaces. Determine the jacket loss (L,) expressed as • percent and measured in accordance with

section 3.2 of this appendix. For other vented

heaters L^O.O.

4.1.6 Latent heat loss. Bused on the fueL obtain the latent heat loss (1*.*) from Table 2

of this appendix.

4.1.7 Ratio of combustion air mass flow

rate to stoichiometric air mass flow rate Determine the ratio of combustion air mass

flow rate to stoichiometric air mass flow rate (RT F). and defined as:

Rt.p = A + B/X^ojf where: A = as determined from Table 2 of this appendix B = as determined from Table 2 of this appendix

Xi-oir = as defined in 3.1 of this appendix

4 18 Ratio of combustion and relief oir mass flow rate to stoichiometric oir mass

flow rate For vented healers equipped with
Federal Register / Vol. 49, No. 61 / Wednesday, March 28, 1934 / Rules and Regulations 12173

eilher an integral draft diverter or a drafthood, determine the ratio of combustion

and relief air mass flow rate to stoichiometric

air mass flow rate (Rt.sI- and defined as:

R-r.s = A + [B/XCOls] where: A = as determined from Table 2 of this appendix B = as determined from Table 2 of this appendix

Xco»s = as defined in 3.1 of this appendix

4.1.9 Sensible heat loss at steady-state

operation. For vented heaters equipped with

either an integral draft diverter or a draft hood, determine the sensible heat loss at steady-state operation (Lj.ss.a) expressed as a percent and defined as: where:

Ls.ss. a — C(Rx DJPYss — Tha) C = as determined from Table 2 of this appendix R t s =as defined in 4.1.8 of this appendix D = as determined from Table 2 of this appendix

TSiSS =as defined in 3.1 of this appendix

Tk^= as defined in 2.9 of this appendix

For vented heaters equipped without an

integral draft diverter, determine (Ls.ss.a) expressed as a percent and defined as: Ls.sS.A=C(RI. r +D)(TF. ss -T^)

where: C = as determined from Table 2 of this appendix RT . F =as defined in 4.1.7 of this appendix

D=as determined from Table 2 of this appendix

Tp^s=as defined in 3.1 of this appendix

T^ = as defined in 2.9 of this appendix

4.1.10 Steady-state efficiency. For vented

heaters equipped with single stage thermostats, calculate the steady-state

efficiency (excluding jacket loss. T) sS, expressed in percent and defined as: 1U0— L^,*— Ls SS.A where: U,A = as defined in 4.1.6 of this" appendix

Ls.ss.A=as defined in 4.1.9 of this appendix

For vented heaters equipped with either two stage thermostats or with step- modulating thermostats, calculate the steadystate efficiency at the reduced fuel input rate,

Tjss.L expressed in percent and defined as:

T)sS—L— 100 — L|..» — Lfc ss.a where:

Lt, A = as defined in 4.1.6 of this appendix

Ls.ss a = bs defined in 4.1.9 of this appendix in which Ls.,,s.a >s determined at the reduced fuel input rate For vented heaters equipped with two

stage thermostats, calculate the steady-state

efficiency at the maximum fuel input rate,

rjss H, expressed in percent and defined as:

T/ss h = 100 — Li_. a —

L

t.ss.* where: bu* = as defined in 4.1.6 of this appendix

Ls.ss A = es defined in 4.1.9 of this appendix in which L,^ a is measured at the maximum fuel input rate For vented heaters equipped with step- inodulating thermostats calculate the

weighted-average steady-state efficiency in

the modulating mode, expressed in percent and defined as:

T)ss MOL)— [T)ss—H — tjss—l] + 7)ss L

where:

^ss H = as defined in 4.1.10 of this appendix

V**x= as defined in 4.1.10 of this appendix

T0a- = average outdoor temperature for vented heaters with step-modulating thermostats operating in the modulating

mode and is obtained from Table 3 or

Figure 1 of this appendix

Tc = balance point temperature which

represents a temperature used to apportion the annual heating load between the reduced input cycling mode

and either the modulating mode or maximum input cycling mode and is obtained either from Table 3 of this appendix or calculated by the following

equation:

Tc = 65 — [(65 — 15)R] where:

65 = average outdoor temperature at which a vented heater starts operating

15 = national average outdoor design

temperature for vented heaters R = ratio of reduced to maximum heat output

rates, as defined in 4.1.13 of this appendix

4.1.11 Reduced heat output rate. For

vented heaters equipped w’ith either two

stage thermostats or step-modulating

thermostats, calculate the reduced heat

output rate IQmi ou:) defined as:

Qred out — T)sSl.Qr«l in where:

Tjss i =as defined in 4.1.10 of this appendix

Qr«rir = the reduced fuel input rate

4.1.12 Maximum heat output rate. For vented heaters equipped with either two

stage thermostats or step-modulating

i thermostas. calculate the maximum heat

output rate (Q^ oul ) defined as:

( Qm«. out-*)ss.H Qmn. In where:

t)Ss H =as defined in 4.1.10 of this appendix

Qm.» in=the maximum fuel input rate

4.1.13 Ratio of reduced to maximum heat

i output rates. For vented heaters equipped

with either two stage thermostats or step- modulating thermostats, calculate the ratio of reduced to maximum heat output rates (R) expressed as a decimal.and defined as: R = Qrrd oul/Qmu oul where:

Qr«i oui = as defined in 4.1.11 of this appendix

Qnu, oui = t>s defined in 4.1.12 of this appendix

4.1.14 Frcction of heating load at reduced

operating mode. For vented heaters equipped

with either two stage thermostats or step- modulating thermostats, determine the

fraction of heating load at the reduced

operating mode (Xi) expressed as a decimal

and listed in Table 3 of this appendix or obtained from Figure 2 of this appendix.

4.1.15 Fraction of heating load at maximum operating mode or noncycling mode. For vented heaters equipped with

either two stage thermostats or step- modulating therostats, determine the fraction of heating load at the maximum operating

mode or noncycling mode (Xi) expressed as a decimal and listed in Table 3 of this appendix

or obtained from Figure 2 of this appendix.

4.1.16 Weighted-average steady-state

efficiency. For vented heaters equipped with

single stage thermostats, the weighted- average steady-state efficiency (%r-vi) is equal to ijss. as defined in section 4.1.10 of

this appendix. For vented healers equipped

with two stage thermostats, t^-mt is defined

as:

fJsS-WT = XiTJsST. +

where:

Xi = as defined in 4.1.14 of this appendix

77 SS-L =as defined in 4.1.10 of this appendix

X»=as defined in 4.1.15 of this appendix

»)ss-H = as defined in 4.1.10 of this appendix

For vented heaters equipped with step- modulating thermostats, ijss-^-r is defined as: VT~ XiT)iB-L+ Xj'TJss-MOD where:

Xi = as defined in 4.1.14 of this appendix

7?sx-i.= as defined in 4.1.10 of this appendix

X2 =as defined in 4.1.15 of this appendix

17 ss-MnD=as defined in 4.1.10 of this appendix

4.1.17 Annual fuel utilization efficiency. Calculate the annual fuel utilization efficiency (AFUE) expressed as percent and

defined as: AFUE= [0.9687JSS-WT] — 1.76DF — 1 .89DS — 129PF —2.8 Lj + 1.81 where:

’Jss—»T=as defined in 4.1.16 of this appendix

DF =as defined in 4.1.2 of this appendix

Ds =as defined in 4.1.3 of this appendix PF = as defined in 4.1.4 of this appendix

Lj = as defined in 4.1.5 of this appendix

4.2 Annual fuel utilization efficiency for gas or oil fueled vented home heating

equipment equipped with manual controls. The following procedure determines the annual fuel utilization efficiency for gas or oil fueled vented home heating equipment

equipped with manual controls.

4.2.1 A verage ratio of stock gas mass flow

rate to flue gas mass flow rate at steady-state

operation. For vented healers equipped with

either direct vents or direct exhaust or are outdoor units, the average ratio of stack gas mass flow rate to flue gas mass flow rate at steady-state operation (S/F) shall be equal to unity. (S/F = 1 .) For all other types of vented

heaters, calculate (S/F) defined as: S/F = 1.3RT. s /RT . r

-B6-
MI' 1 Frdera! Register / Vol. 49, No. 61 / Wednesday, March 28, 1S84

where:

K ,

. - -i j defined in 4.1.8 of this nppendix with X measured at 50% fuel input rate H r .f - as defined in 4.1.7 of this appendix with

Xr.cr fnejs:red at 20% fuel input rate 1-2 Multiplication factor for infiltration

/*'•»' during burner on-cycle. Calculate the

fTt.iliipiicdiu>ii factor for infiltration loss during burner on-cycle lK,.0N ) defined as: K, ov = lOOiO.24) (S/F) (0.7) (1 + RT.r(A/F)]/ HHVa where:

100 - converts a decimal fraction into a percent

0.24 = specific heat of air A/F = stoichiometric air/fuel ratio,

d- tPrmined in accordance with Table 2

of this appendix

S/F - as defined in 4.2.1 of this appendix at 50

percent of rated maximum fuel input

0.7 = infiltration parameter

Rv F = as defined in 4.1.7 of this appendix

HHVA = average higher heating value of the

test fuel, determined in accordance with Table 2 of this appendix

4.2.3 On-cycle infiltration heat loss. Calculate the on-cycle infiltration heat loss

(I*i on) expressed as a percent and defined as:

1*i.om = K|.on (70-45) where:

K. ,,v = as defined in 4.2.2 of this appendix

70 -average indoor temperature

43 = average outdoor temperature

4.2.4 Weighted-A verege Steady-State

Efficiency. For manually controlled heaters wi'h various input rates the weighted average

steady-state efficiency (rjSS WT). is at 50

percent of the maximum fuel input rate as treasured in either section 3.1.1 to this appendix for manually controlled gas vented

heaters or section 3.1.2 to this appendix for manually controlled oil vented heaters. For manually controlled heater with one single

firing rate the weighted average steady-state

efficiency is the steady state efficiency

measured at the single firing rate.

4.2.5 Part-load fuel utilization efficiency. Calculate the part-load fuel utilization efficiency (-rjJ expressed as a percent and

defined as:

15u = ’)ss wr~ I*).ox where:

’I ts wT = as defined in 4.2.4 of this appendix

Li.o\ = as defined in 4.2.3 of this appendix

4 2.6 Annual fuel utilization efficiency. For manually controlled vented heaters. Calculate the annual fuel utilization efficiency (AFUE) expressed as a percent and

defined as:

AFUE=

440Qt7sst]„Q, 440O7jssQin _ (ll _>< + 2.5(4000)tj uQp

where:

4 l!K) = average number of heating degree days

T) ss = as defined as tj ss * t in 4.2.4 of this appendix

rj„ = as defined in 4.2.5 of this appendix

Qm m,i = as defined as Q,n at the maximum

fuel input rate, as defined in 3.1 of this appendix

46C0 = average number of non-heating season

hours per year Q„ = as defined in 3.5 of this appendix

4.3 Annuel fuel utilization efficiency by

the tracer gas method. The annual fuel utilization efficiency shall be determined by

the following tracer gas method for all vented

heaters equipped with thermal stack dampers. All other type3 of vented heaters can elect to use the following tracer gas method, as an optional procedure.

4.3.1 On-cycle sensible heat loss. For vented heaters equipped with single stage thermostats, calculate the on-cycle sensible j heat loss (Ls. 0x) expressed us a percent and

j defined as:

l*3.0N = Ls-ss.a where: Ls .ss.A = as defined in 4.1.9 of this appendix

For vented heaters equipped with two j stage thermostats, calculate Lj.on defined as: | Ls .os — XiLs.ss.A'lrt + ^C^-S-SS-A where:

Xi =as defined in 4.1.14 of this appendix

Ls.ss.a rcd= 2 s defined as in 4.1.9 of this

j appendix at the reduced fuel input rate X» = us defined in 4.1.15 of this appendix

U-ss.a-m»r=as defined as Lj.ss.* in 4.1.9 of this appendix at the maximum fuel input rate ! For vented heaters with step-modulating

thermostats, calculate Ls,0N defined a3:

Ls.ON = XiLs.S3.Ar*4+ XiLsss.v*** where: X = i-as defined in 4.1.14 of this appendix

Us ss A «d =as defined in 4.3.1 of this appendix

X2 = as defined in 4.1.15 of this appendix

Ls ss.A m»«= average sensible heat loss for step- modulating vented heaters operating in the modulating mode

(*S.SS. A — avg —

+ 1*S.SS_\ - r*U

[^*S.SSA -max In.SSA-rml]|'

Tc~Tqa*

TC-15

where:

Ls^s.A-«»« = as defined in 4.3.1 of this appendix

Tc = as defined in 4.1.10 of this appendix

T0A

, = as defined in 4.1.10 of this appendix

15 = as defined in 4.1. 10 of this appendix

4.3.2 On-cycle infiltration heat loss. For vented heaters equipped with single stage thermostats, calculate the on-cycle

infiltration heat loss (L(. 0 s) expressed as a percent and defined as:

l-i . on = Ki.os(70—15) where:

Ki.oN = as defined in 4.2.2 of this appendix

70 — as defined in 4.2.3 of this appendix

45 = as defined in 4.2.3 or this appendix

For vented heaters equipped with two

stage thermostats, calculate L,.0N defined as:

1*1.0N' = XiKi.oN Mufi^-T<j x*) -(-XjKj.oN.x^^OT0a) where:

/ Rules and Regulations

Xi = as defined in 4.1.14 of this appendix

Ki.oN-mu =a3 defined as Kj-o* in 4-2.2 of this appendix at the maximum heat input rate 70 = as defined in 4.2.3 of this appendix

T0A* = as defined in 4.3.4 of this appendix

Ki oN r*a = as defined as KI 0J, in 43J2. of this appendix at the minimum heat input rate T0A =as defined in 4.3.4 of tHis appendix

Xj = as defined in 4.1.15 of this appendix

For vented heaters equipped with step- modulatir.g thermostats, calculate L,. 0, defined as:

I*i.on = XiK|4)^ (70—Toa*) + XjKj.os-r»a(70-To A ) where:

Xi = as defined in 4.1.V4 of this appendix

l^l an.rrxj "h Xj.qn r*al

2

70 = as defined in 4.2.3 of this appendix

T0a* = as defined in 4.3.4 of this appendix

Xj = as defined in 4.1.15 of this appendix

T0A = as defined in 4.3.4 of this appendix

4.3.3 Off-cycle sensible heat loss. Fur vented heaters equipped with single stage thermostats, calculate the off-cycle sensible heat loss (Ls.off) at the maximum fuel input

rate. For vented heaters equipped with step- modulating thermostats, calculate Lj.o >t defined as: Li OFF=Xl Ls . OFT.rrt where:

X, = as defined in 4.1.14 of this appendix

Ls orF.rrt = as defined as Ls .orr in 4.3.3 of this appendix at the reduced fuel input rate

For vented heaters equipped with two

stage thermostats, calculate L^rr defined us:

l*s OFT = XiL-j.0FF.rKl + XiLj.0FT.Mm where:

X! =as defined in 4.1.14 of this appendix

Ls off ,«i = as defined as L, orT in 4.3 J of this appendix at the reduced fuel input rate X2 = as defined in 4.1.15 of this append x

Ls off m«« = as defined as L3 .0ft in 4 3 3 of this appendix at the maximum Fuel input rate Calcula ; e the off-cycle sensible heat loss

(Ls off) expressed as a percent and defined

as:

-B7-
Federal Register / Vol. 49, No. 61 / Wednesday, March 28, 1984 / Rules and Regulations 12175

t-SOKK

100(0.24) •Q,An

X rn S OKF0’s.OFF~TRA)

where:

100 = conversion factor for percent

0.24 = specific heat of air in Btu per pound — ' F Qm = fuel input rate, as defined in 3.1 of this appendix in Btu per minute (as appropriate for the firing rate)

ton = average burner on-time per cycle and is 20 minutes 2ms .oFF(Ts,orF—^18.0 = summation of the twenty values of the quantity, ms . 0FF(Ts.o ff— Ira), measured in accordance with

3.3

of this appendix

n’s cFF = stack gas mass flow rate pounds per minute

1.325PBVT(CT

- —CT)

file OFF —"— ~ 0^+460)

Ts.off= stack gas temperature measured in accordance with 3.3 of this appendix

Tka= average room temperature measured in accordance with 3.3 of this appendix

PB =barometric pressure in inches of mercury VT = fiow rate of the tracer gas through the stack in cubic feet per minute Cr-= concentration by volume of the active

tracer gas in the mixture in percent and

is 100 when the tracer gas is a single

component g„s Gr= concentration by volume of the active

tracer gas in the diluted stack gas in percent « \ Tt = temperature of the tracer gas entering the flow meter in degrees Fahrenheit (TV+460) = absolute temperature of the tracer gas entering the flow meter in degrees

Kankine

4.3.4 A verage outdoor temperature. For

vented heaters equipped with single stage

thermostats, the average outdoor temperature

(Toa) is 45 F. For vented heaters equipped

with either two stage thermostats or step- modulating thermostats, T0A during the reduced operating mode is obtained from

Table 3 or Figure 1 of this appendix. For

vented heaters equipped with two stage

thermostats. T0A* during the maximum

operating mode is obtained from Table 3 or

Figure 1 of this appendix.

4.3.5 Off-cycle infiltration heat loss. For vented heaters equipped with single stage thermostats, calculate the off-cycle

infiltration heat loss (L,.orr) at the maximum fuel input rate. For vented

heaters equipped with step-modulating

thermostats, calculate L,. 0ff defined as: Li.off= XiLj.opj-.^j where: Xs = as defined in 4.1.14 of this appendix

Li.oFF. r «i=es defined in L^pp in 4.3.3 of this appendix at the reduced fuel input rate For vented heaters equipped with two

stage thermostats, calculate L,.0ff defined as:

Li.oFF = XiLi. OFT.„d + X2L|. orr, m„

where: X1 = as defined in 4.1.14 of this appendix

Li oft. r*d = as defined as L|.0ff in 4.3.3 of this appendix at the reduced fuel input rate X; = as defined in 4.1.15 of this appendix

Li.oFF.M*« = as defined as L|.0ff in 4.3.3 of this appendix at the maximum fuel input rate Calculate the off-cycle infiltration heat loss

(Li off ) expressed as a percent and defined

as:

, 10CI(0.24)(1.3)(0.7)(70—

T

L ua) ^ >Of> ppr XmS.OKF

where:

100 = conversion factor for percent

0.24 = specific heat of air in Btu per pound— * F

1.3=dimensionless factor for converting

laboratory measured stack flow to typical field conditions

0.7 = infiltration parameter

70 = assumed average indoor air temperature.

' F T0A = avF.age outdoor temperature as defined

4.3.4 of this appendix

Q, =fuel input rate, as defined in 3.1 of this appendix in Btu per minute (as appropriate for the firing rate)

t cn = average burner on-time per cycle and is 20 minutes 2ms . 0FF = summation of the twenty values of the quantity, ms.oFF- measured in accordance with 3.3 of this appendix ms .oFF = as defined in 4.3.3 of this appendix

4.3.6

Part-load fuel utilization efficiency. Calculate the part-load fuel utilization efficiency (t] u ) expressed as a percent and

defined as

:

Tju.lOO-Uv-Cii-i—

| ~+P>t“1

+ [Lj.on + L»-OFF +Won +Ih*OFf1

w here:

C, = 2.3, adjustment factor L,=jacket less as defined in 4 15

L[, a =£S defined in 4.1.6 of this appendix

toa =es defined in 4.3.3 of this appendix

Ls.os =as defined in 4.3.1 of this appendix

Ls.off= ss defined in 4.3.3 of this appendix

L, ON = as defined in 4.3.2 of this appendix

L,!off=ss defined in 4.1.4 cf this appendix Pr =as defined in 4.1.4 cf this appendix

tofT=average burner ofl-time per cycle and is 20 minutes

4.3.7

Annual fuel utilization efficiency. Calculate the annual fuel utilization efficiency (AFUE) expressed as a percent and

defined as:

i

4400TJs5 _wT7l_Q.n-m.x

AFUE=

44(Xh, ssQ,n . m„ + 2.5(4600)7, ugp

where:

! 4400=as defined in 4.2.6

ij ss_WT =as defined in 4.1.16 of this appendix

Tj u =as defined in 4.3.6 of this appendix

Qtn-mM — 38 defined in 4.2.6 of this appendix

4600= as defined in 4.2.6 of this appendix

Qp =as defined in 3.5 of this appendix

4.4 Stack damper effectiveness for vented

heaters equipped with electro-mechanical

stack dampers. Determine the stack damper

effectiveness for vented heaters equipped

with electro-mechanical stack dampers (D0), defined as: D„ = 1.62 [1—AD cos fl/As) where: Au=as defined in 3.4 of this appendix

fi = as defined in 3.4 of this appendix As = as defined in 3.4 of this appendix

4.5

Addition requirements for vented home heating equipment using indoor air for combustion and draft control. For vented home heating equipment using indoor air for combustion and draft control. Dp, as described in section 4.1.2 of this appendix,

and Ds, as described in section 4.1.3 of this appendix, shall be determined from Table 1 cf this appendix.

4.5.1 Optional procedure for determining

DP for vented home heating equipment.

Calculate the ratio (DP ) of the rate of flue gas mass through the vented heater during the

off-period, Mf.off(Tf.ss). to the rate of flue gas mass flow during the on-period, Mp.ss(Tr.ss). and defined as: Dp=

M

f.off(Tf,ss)/Mf>ssC!*f.ss) For vented heaters in which no draft is maintained during the steady-state or cool down tests, Mf.off(Tf.ss) is defined as:

Mf.off(Tf.ss) =

[JVss^^l056 [TWr+fM

[ F.OFt(T F.OFT-)

l X

* FOFF —Tra ] l Tkss+460 J

For oil fueled vented heaters in which an imposed draft is maintained, as described in section 3.6 of this appendix. Mf.off(Tf.ss) * 8 defined as:

Mf.oft(Tf-ss) =Mf-off(TVss)

where: Tr .ss = as defined in 3.1.1 of this appendix T* r oFF = fl ue 8as temperature during the olf- period measured in accordance wi«h 3...

of this appendix in degrees Fahrenheit TKA = as defined in 2.9 cf this appendix

-B8-
12176 federal Register / Vol. 49. No. 61 / Wednesday, March 28. 1984 / Rules and Regulations

1.325 PaVrOOO — G,)

Ci(Tt+46C)

p, = barometric pressure measured in accordance with 3.6 of this appendix in inches of mercury Vt = flow rate of tracer gas through the vented heater measured in accordance

with 3 0 of this appendix in cubic feet per minute Gr = concentration by volume of tracer gas

present in the flue gas sample measured

in accordance with 3.6 of this appendix

in percent C T

* = concentration by volume of the active

tracer gas in the mixture in percent and

is luO when the tracer gas is a single

component gas Tt = the temperature of the tracer gas entering

the flow meter measured in accordance

. with 3.6 of this appendix in degrees

Fahrenheit

(T r -f--tC0)-= absolute temperature of the tracer gas entering the flow meter in degrees

Rankine

Mr «(T> *) -QJRr rfA/F) + l]/(60HHVA | . Q,. = as defined in 3.1 of this appendix

R r r = as defined in 4.1.7 of this appendix

A/F = as defined in 4.2.2 of this appendix

HI 1

V

A = as defined in 4.2.2 of this appendix

4.5 2 Optional procedure for determining

off-cycle draft factor for flue gcs flow for vented teeters. For systems numbered 1 thru

10. calculate the off-cycle draft factor for flue gas flow (Dr) defined as: Dy = Dp

For systems numbered 11 or 12: Dr =DPD0 where: Da = as defined in 4.5.1. of this appendix

D0 = as defined in 4.4 of this appendix

4.5.3 Optional procedure for determining

off-cycle draft factor for stock gas flow for vented heaters. Calculate the off-cycle draft

factor for stack gas flow (D 3 ) defined as: For systems numbered 1 or 2: Ds = 1.0 For systems numbered 3 or 4: Ds = (Dp+0.79)/

1.4 For systems numbered 5 or 6: DS = D0 For systems numbered 7 or 8 and if Dg(S/ F)<l:Ds = DoDp

For svstems numbered 7 or 8 and if D0(S/ F)>1: D s - DUD, + [0.83 - D^Drl [DU(S/F) - 1 1/(S/ F --

1

1

where: DP =as defined in 4.5.1 of this appendix D0 = os defined in 4.4 of this appendix

Table i.—Off-Cycle Oraft Factors for

F

1

1

" vjas Flow (Op ) and for Stack Gas Flow

(DcT for Vented home heating Equipment

Equipped Without Thermal Stack Dampers

System

(Ov) (0,1 Burner

tyo* Venting system typ* 1

1 10 1.0 Atmov Draft hood or (Warier. phene. t>ah hood or ^verier. Barometric draft 2. 04 1 0 Power

3 10 1.0 Atmosphene. regulator. 0.4 065 Per**' 04jom#fr»c draft regulator

3

1.0 0. AtfTW*- Cratl rood or drverter pfvenc with damewr0.4 D. Power Draft hood or drverter with damoer

7 1.0 0. Atmos- Barometric ttaft pher-c. regulator wun

damper

A 0.4 ob• Barometric draft regulator wnft damper. 0 10 Atmos- Drect venL phene

to 0.4 Pow#r 0tf 9d vwnt

tl Op AtmoA- Dvsd vent wtih phene damper.

12 0.4 Power. Dracl vant writ) o. damper.

1 Venting system* Hted «wth darrpers mein* electro mecnamcal dampers only.

Tasue 3.—Fraction of Heating Load at Reduced Operating Moce (Xi) and at Maximum Operating Mode (X2). Average

Outdoor Temperatures (TCA and TOA’).

and Balance Point Temperature fTC) for

Vented Heaters Eouipped With Either

Two-Stage Thermostats or Step-Modulating Thermostats

Heat output raoo * Xt X2 TOA TOA* TC

o re to o 24 .12 88 57 40 53

0.25 to 0 29 _ ,ie 6a 56 39 51 0 30 to 0 34 60 54 36 49

0 35 to 0 39 .30 .70 53 36 46

0.40 to 0 44 36 .64 52 35 44 0 45 to 0 49 43 .57 St 34 42

0 50 to 0 54 52 46 50 32 39

0 55 to 0 59 60 .40 49 30 37 0 60 to 0 64. .70 .30 46 29 34 0 65 tn 0 6? . .76 -24 47 27 32 0 7Q to 0 74 64 .16 46 25 29 0 7* o 79 68 .12 46 22 27 0 80 to 0 84 84 06 45 20 23

0 85 to 0 89 . .96 04 46 18 21

0 90 o .98 .02 44 16 19 0 95 to 0.99. .99 .01 44 13 17

•The heat output raoo me*ns the r»oo of rr^rmjm to manmum heat output rates AS aetmeo n 4 113.

Table 2.—Values of Higher Heating Value (HHV(J, Stoichiometric Air, Fuel (A/F). Latent Heat Loss (L^) and Fuel-Specified Parameters (A, B, C. ano 0) for Typical Fuels

Fuel* HHV.

(Btu/lb) a;f Loe A B c 0

19 600 14 56 6.55 0.0679 1422 00179 0 167 Mn ? nJ 19.500 14 49 6 50 0.0667 14 34 0 0181 0 167 20,120 14 45 6.55 00919 10 96 0 0175 0 171 10.500 1181 10.14 0.0965 10 10 0 0155 0235

21.500 15 58 7.9S 0 0641 1260 00177 0 151 Butane 20.000 15.36 7.79 O.C60B 12.93 0.0180 0.143

-B9-
Federal Register / Vol. 49, No. 61 / Wednesday. March 28, 1904 / Rules and Regulations 12177

FIGURE 1 Average Outdoor Air Temperature vs. Balance Point Temperature for Modulating Vented Heaters

-BIO-
FRACTION

OF

TOTAL

ANNUAL

HEATING

LOAD

APPLICABLE

TO

REDUCED

OPERATING

MODE

(X.)

12J7C Federal Register / Vol. 49, No. 61 / Wednesday, March 28. 1984 / Rules and Regulations

FIGURE 2

Fraction of Total Annual Heating Load Applicable to Reduced Operating

Mode (X,) and to Maximum Operating Mode or Modulating Mode (X*) vs. Balance Point Temperature for Modulating Vented Heaters

BALANCE POINT TEMPERATURE Tc(*F) This figure is based on 4500 degree-days and 15° F outdoor design temperature.

|KR Hoi M-7231 Filed 3-27-S4 » 45 am) BILLING CODE 6450-01-C

-B1 1-

FRACTION

OF

TOTAL

ANNUAL

HEATING

LOAD

APPLICABLE

TO

MAXIMUM

OPERATING

MODE

OR

MODULATING

MODE

(X*)

appendix c

EXAMPLES

Completed Input Form

Input Files

Computer Runs

EXAMPLE- COMPLETED INPUT FORM

System

U

Fuel

a Control

H

Option

H

Fuel Cost

p

/

tv p rp

Elect. Cost

c/vvn-i

5" 3 'Z 3 64. 6 763

Pilot Elect

Jacket

Btu/ min* kW * Loss, %

*

<^•0 o. too ±£

NOTE #1 . Enter 50fj input rate values

if manual control, type

if 2. *=enter 0.0 if not measure.-3

. Fuel Input Room Amt). Stack Temp. Flue Temp. CG2 Stack C02 Flue 1 E t u / m i n

F or C F or C * F or C

* « * *

<P o O 'ZX. ~L\ /<=? 3.3 2-bl. (t>. 5" /o o E nter next line onlv if tested at second (reduced) incut rat e

0 x\. $ / 4J /r?.r S', c P.S

E nter next line only if with damper and

Stack Area

sa . in

Damper area

sq. in.

Angle

dee

—

— -

off-loss not measured

I nter next line only if draft measured (Do), option #2.

Barometer^

M Hg or mb

Gas Temp.

F or C

Gas Cone.

%> or com

Gas Flow

cu . f t . /min

Trac . Cone

i> or com

Flue Temp.

F or C — — —

—

-

Enter next lines only if measured high fire off-loss measured.

Barometer

„ ~ , *

-s. or mo

Gas Temp.

F or C

Gas Cone.

£ or com

Gas Flow

cu . f t . /m in

<oo( -LO, 5

- 5"D? 0 0 0 . O 0 0 "7<P 3

Me as Trac . Cone

Flue Temp.

a

i> or ppm F or C

1 1 . 1 /fe /. Jo 2 n~r.f

7 i b too. 3 1 7 7 .b

9 ?P. c 7i. g 6 7 °l. * > 0.7 9i. 3 6»<r. cP d ( u 0 . 0 9 5-7.9

1C lot. 8

Enter next lines only .f reduced fire off-loss measured.

Barometer

"Ee or mb

Gas Temc.

F or C

Gas Cone.

°C or ccm

Gas Flow

cu . f t . /m i n 0. 0 2-0 . S’ Tup 0 0 0 . t a 0 S" 7

Me as Trac . ConeFlue Temp.

a

•t ^ or pem F or C

1 / lu. r dr.i

/ i/. / 3 ST- L

£ l <c0.l -tr.i

-

Itp't.f ^L-l

(2 4(7. 0

l ( P4./ 3°i. 0 c

/PP. ? *6-9

G. -Lol. c 3T.i

10 2J*. 3 344

-ci
EXAMPLE COMPUTER DATA FILE

tstdat. vhtst7

1 Assumed data to test program VENT* also check conversions.

2 Two-stage modulating* with damper* measured off-loss.

3 5 3 2 3 64.6 7.63

4 3 .1 4.5

5 800 22.22 193.3 263 6.5 10.0

6 400 21.5 143 157.5 5.5 8.5

7 1001 20.5 508000 .00073398

8 73. 1 161.6

9 75 . 3 1 25 .

10 77.6 100.3

11 77.6 84.9

12 78.5 76.8

13 79.8 70.7

14 88.3 65.8

15 100.0 61.3

16 104.5 57.9

17 106.8 54.9

18 0 20.5 508000 .00057 ** 19 1 20 .5 95 . 2

20 131.1 69.8

21 147.0 55.2

‘Temperatures in degrees celsuis

" Barometric pressure in millibars

^Default barometric pressure

22 160.2 45.1

23 167.8 42.1

24 176.9 40.0

25 184.1 39.0

26 188.9 36.9

27 203.5 35.3

28 213.3 34.6

END OF FILE

C2—
example computer run using data from file xqt

Input data, type- "©ADD FILENAME. ELEMENTNAME"

>@add tstdat.vhtst7

VENTED HEATER TEST REPORT

Assumed data to test program VENT, also check conversions.

Two-stase modulating, with damper, measured off-loss.

*******#*** INPUT SELECTIONS *#•#**»» 

SYSTEM # FUEL CONTROL OPTIONS FUEL-COST ELECT-COST

5 3 2 3 64.60 7.63

WITH PILOT LIGHT, QP=BTU/MIN.= S.

ELECTRIC POWER, KW=. 100

JACKET LOSS, 7. LOSS- 4.50

INPUT DATA ** ***************

HIGH FUEL INPUT RATE DATA

INPUT AMB TEMP TEMP C02 C02

BTU/MIN TEMP STACK FLUE STACK FLUE

800.0 72.0 379.9 505. 4 6.5 10.0

LOW FUEL INPUT RATE

400.0 70.7 289.4 315.5 5.5 3.5

HIGH FIRE OFF-LOSS DATA.

BARO. TEMP. CONC. VOLM. CONC. TEMP.

PRES. TRAC. TRAC. TRAC. FLUE FLUE

30.46 68.9 .51+006 . 78-003 . 73+002 322.9

. 75+002 258.4

. 78+002 212. 5

. 73+002 184. 8

. 78+002 170.2

. 80+002 159.3

. 38+002 150.4

. 10+003 142.3

. 10+003 136.2

. 1 1+003 130.8

LOW FIRE OFF-LOSS DATA.

30.00 68.9 .51+006 . 57-003 . 12+003 203.4

. 13+003 157.6

. 15+003 131 .

. 16+003 113. 2

. 17+003 107.8

. 13+003 104.0

. 18+003 102. 2

. 19+003 93. 4

. 20+003 95.5

.21+003 94.3

LOW HEAT FRACTION3 .520 HIGH HEAT FRACTION3 .480

BALANCE POINT TEMP. =39. 42

Ls, on 3 9.53 Li, on 3 .90

Ls , off 3 .86 Li, off 3 .25

-s- #-*-8- TEST RESULTS ##*##*#**#********»

WEIGHTED STEADY STATE EFFICIENCY3 80.927.

AFUE= 65.037.

COST/MILLION BTU3 % 10.11

—C3—
EXAMPLE COMPUTER DATA FILE

Temperatures in degrees Fahrenheit

t stdat . vhtst6

1 Assumed data to test program VENT

2 Single stage? with damper? measured off-loss.

3 5 3 1 3 64.7 7.63

4 3 . 1 4.5

5 300, 72, 330,505. 5, 6. 5? 10.0

6 1000. 70.0 508000. 0.00073393

7 73.1 322.9

8 75.3 258.4

9 77.6 212.5

10 77.6 184.3

11 78.5 170.2

12 79.8 159.3

13 83.3 150.4

14 100.0 142.3

.1.5 104.5 136.2

16 106.8 130.8

END OF FILE

—C4 —
example computer run

Input data, tv pa -"©ADD FILENAME. ELEMENTNAME"

>@add t stdat . vhtst6

VENTED HEATER TEST REPORT

Assumed data to test program VENT

Single stage, with damper, measured off-loss.

*********** INPUT SELECTIONS ***********

SYSTEM # FUEL CONTROL OPTIONS FUEL-COST ELECT-COST

=; 3 1 3 64.70 7.63

WITH PILOT LIGHT, QP=BTU/MIN.= 8.0

ELECTRIC POWER, KW=. 100

JACKET LOSS, 7. LOSS= 4.50 *********** INPUT DATA *****************

I OH FUEL INPUT RATE DATA

I NPIJT AMB TEMP TEMP C02 C02

BTU/MIN TEMP STACK FLUE STACK FLUE

800. 0 72 . 0 380 . 0 505 .

6.5 10.0

UGH FIRE OFF-LOSS DATA.

BARO. TEMP. CONC . VOLM

CONC

TEMP.

PRES. TRAC. TRAC. TRAC. FLUE FLUE

30. 43 70.

.51+006 .78-003 . 73+002 322. 9

. 75+002 258.4

. 78+002 212.5

. 78+002 184.8

. 78+002 170.2

. 80+002 159.3

. 88+002 150.4

. 10+003 142.3

. 10+003 136. 2

. 1 1+003 1 30 .

Ls,on == 10.51 Li, on = .04

LS,5 , Ort o f f 31== 1.30 . o'-' L.JLi , oyrr- f f = .24 *************** TEST RESULTS ********************

WEIGHTED STEADY STATE EFFICIENCY 79.94*/.

AFUE= 73.627.

COST/MILLION BTU= $ 8.92

—C5—
VENTED HEATER TEST REPORT

Assumed data to test program VENT

Single stage? minimum testing.

INPUT SELECTIONS tf#*-#*#***##

ELECT-COST

7.63

###*####### INPUT DATA it##****#***#**#**

HIGH FUEL INPUT RATE DATA

INPUT AMB TEMP TEMP C02 CO2

BTU/MIN TEMP STACK FLUE STACK FLUE

800 .

72.0 380.0 505. 5 6.5 10.0

SYSTEM1311 # FUEL CONTROL OPTIONS FUEL-COST

64.70

WITH PILOT LIGHT, QP=BTU/MIN.= 8.0

ELECTRIC POWER, KW=. 100

JACKET LOSS, 7. LOSS= 4.50

Df =1 . 00 Ds=l . 00

TEST RESULTS **#*•*#**#**#*****•**•*

WEIGHTED STEADY STATE EFFICIENCY= 79.947.

AFUE= 56.557.

COST/MILLION BTIJ= $ 11.58

= (. 968*79. 94) -1.78-1. 84- (3- 93*4. 5)+l, 81 = 56.6%

oUU

AFUE
VENTED HEATER TEST REPORT

Assumed data to test program VENT

Manual -on off

minimum testing.

*********** INPUT SELECTIONS ***********

SYSTEM # FUEL CONTROL OPTIONS FUEL-COST ELECT-COST

1 3 5 1 64.70 7.63

WITH PILOT LIGHT, GP=BTU/MIN.= 8.0

ELECTRIC POWER, KW=. 100

JACKET LOSS, 7. LOSS= 4.50 *********** INPUT DATA *****************

HIGH FUEL INPUT RATE DATA

INPUT AMD TEMP TEMP C02 C02

BTU/MIN TEMP STACK FLUE STACK FLUE

800.0 72.0 380.0 505.5 6.5 10.0

Li , on= . 04 *************** TEST RESULTS ********************

WEIGHTED STEADY STATE EFFICIENCY= 79.947.

AFUE= 65.857.

COST /MILL I ON BTU= * 9.96

n, * f|« -L l0N - C; * L;

' *b7.Z1'

\

AFUE ® 7 7

:—

' Hi Q'rJ 1 - 6. 7.3 = bS.?* *1° h

(

1 <r *?S3- J

A p tAT ^ 7

^*7 l/7i /.//< -

—C7—
VENTED HEATER TEST REPORT

Assumed data to test program VENT

Manual -add ustabl e fuel rate* minimum testing.

INPUT SELECTIONS ****•«•#•«•***•»

SYSTEM1341 # FUEL CONTROL OPTIONS FUEL-COST ELECT-COST

64.70 7.63

WITH PILOT LIGHT, GP=BTU/MIN.= 8.0

ELECTRIC POWER, KW=. 100

.JACKET LOSS, 7. LOSS= 4.50

#•**• •*«#*#**•* INPUT DATA tt**#**#******-#*##

507. FUEL INPUT RATE

INPUT AMD TEMP TEMP C02 C02

BTU/MIN TEMP STACK FLUE STACK FLUE

400.0 72.0 290.0 315.5 6.5 10.0

Li,on= .04

#*###*##****#** TEST RESULTS #*#***# -8-** **##**

WEIGHTED STEADY STATE EFFICIENCY= 83.017.

AFUE= 68.857.

COST/MILLION BTU= $ 9.53
VENTED HEATER TEST REPORT

Assumed data to test program VENT

Single stage, minimum testing* with damper.

*********** INPUT SELECTIONS ***********

SYSTEM5311 # FUEL CONTROL OPTIONS FUEL-COST ELECT-COST

64.70 7.63

WITH PILOT LIGHT, GP=BTU/MIN.= 8.0

ELECTRIC POWER, KW=. 100

JACKET LOSS, 7. LOSS= 4.50 *********** INPUT DATA *****************

HIGH FUEL INPUT RATE DATA

INPUT AMD TEMP

BTU/MIN TEMP STACK

800.0 72.0 380.0

TEMP

FLUE

505.5

C02

STACK

6.5

C02

FLUE

10.0

DAMPER DATA: DAMPER AREA= 28.00

Do= .21

, STACK AREA= 26.80 ANGLE=25.

Df =1 . 00 Ds= .21 *************** TEST RESULTS ********************

WEIGHTED STEADY STATE EFFICIENCY=

AFIJE=

COST /MILL I ON BTU=

79.947.

58. 047. * 11.28
VENTED HEATER TEST REPORT

Assumed data to test program VENT

Single stage, with damper, measured draft factor.

#*#***#•*•«••«•* INPUT SELECTIONS *•***•«•******

SYSTEM # FUEL CONTROL OPTIONS FUEL-COST ELECT-COST

5 3 12 64.70 7.63

WITH PILOT LIGHT, QP=BTU/MIN.= 8.0

ELECTRIC POWER, KW=. 100

JACKET LOSS, 7. LOSS= 4.50

•a-*#*#*#*#*# INPUT DATA *****#*****•***«•##

HIGH FUEL INPUT RATE DATA

INPUT AMB TEMP TEMP C02 C02

BTU/MIN TEMP STACK FLUE STACK FLUE

800 .

72. 0 380 .

505 .6.5 10.0

DAMPER DATA: DAMPER AREA3 28. 00 , STACK AREA3 26.80 ANGLE

OPTIONAL Dp PROCEDURE TEST DATA

BARO. TEMP. CONC. VOLM. CONC. TEMP.

PRES. TRAC. TRAC. TRAC. FLUE FLUE

29 .90 70.0 .51 +006 . 50-00 1 . 1 2+006 212.0

Do= .21

Df= .37 Ds= .21

##**#*# TEST RESULTS ****#*****#*•«•#*•»****

WEIGHTED STEADY STATE EFFICIENCY3 79.947.

AFUE= 59. 157.

COST/MILLION BTU= * 11.07

-CIO-
IBS-1 1 4A (REV. 2 -SCI U.S. DEPT. OF COMM. 1. PUBLICATION OR 2. Performing Organ. Report No. 3. Publ ication Date

BIBLIOGRAPHIC DATA

SHEET (See instructions)

REPORT NO.

NBSIR 84-2918 September 1984

4. TITLE AND SUBTITLE

Fortran 77 Computer Program for Test Procedure Calculations of Vented Heaters

5. AUTHOR(S)

R. A. Wise, F. C. Parsons

6. PERFORMING ORGANIZATION (If joint or other than NBS, see instructions)

NATIONAL BUREAU OF STANDARDS

DEPARTMENT OF COMMERCE

WASHINGTON, D.C. 20234

7. Contract/Grant No.

8. Type of Report & Period Covered

9. SPONSORING ORGANIZATION NAME AND COMPLETE ADDRESS (Street. City. State. ZIP)

Department of Energy

Forrestal Building

1000 Independence Avenue

Washington, DC 20585

10.

SUPPLEMENTARY NOTES

J Document describes a computer program; SF-185, FIPS Software Summary, is attached.

11.

ABSTRACT (A 200-word or less factual summary of most significant information. If document includes a significant

bi bl iography or literature survey, mention it here)

The Fortran 77 computer program described in this report is to be used to calculate

results from tests run on vented heaters. The Department of Energy recently published a revised test procedure for such heaters but which contains a simplified method

for testing with a number of testing options that allow more detailed tests to be run

The new procedure also provides for the testing of units with manual controls of two

types, modulating controls of two types, and the testing of units incorporating

thermal stack dampers as well as electro-mechanical dampers. Once input selections

have been made, the program performs the calculations required and prints out the

results

12.

KEY WORDS (Six to twelve entries; alphabetical order; capitalize only proper names; and separate key words by semico'o'-s Computer program; energy; test procedure; vented heaters; furnace

13. AVAILABILITY

[~~X1 Unlimited

| | For Official Distribution. Do Not Release to NTIS

Order From Superintendent of Documents, U.S. Government Printing Office, Washington, D.C.

20402.

QX] Order From National Technical Information Service (NTIS), Springfield, VA. 22161

14. NO. OF

PRINTED PAGES

53

15. Price

$ 10.00

UlCOuM'OC t04 »«»to