### 35410 Federal Register 

## I Vol. 51, No. 192 

## I Friday. 

### October 3, 1986 

## I Notices

r,-' t Energy Conservation Program For ) Consumer Products; Petition for Waiver ofCentral Air ConditionerTest Procedures From The Trane Co. (CAC- .002)

AGENCY: Conservation and Renewable Energy Office. Department ofEnergy.

SUMMARY:Today'snotice publishes a "Petition for Waiver" from The Trane Company (Trane) ofTyler. Texas. requesting a waiver from the existing Department ofEnergy (DOE) test procedures for central air conditioners. Trane manufactures residential and commercial airconditioning appliances. The petition requests DOE to grant relief from the test procedurerelating to the compressor speed specificationfor Trane'sTTS/TWSmodel series central airconditioners (heat pumps). Trane seeks to test using intermediate compressor speeds instead ofthe single speed specified. Tranerequests the test and calculation methods ofAppendixB to the Air Conditioning and Refrigeration Institute Standard210/ 240-84. with modifications. be substituted for the DOE test procedures for central airconditioners. DOE is soliciting comments. data. and informationrespecting the petition.
DATE:DOE will accept comments. data andinformation not laterthan November 3.1986. ADDRESS: Written comments and statements shall be sent to: Department ofEnergy. Office ofConservation and Renewable Energy. Case No. CAC-002. Mail Stop CE-132. Forrestal Building. 1000 Independence Avenue. SW

.. Washington. DC 20585. FOR FURTHER INFORMATION CONTACT: Michael

### J. McCabe, U.S. Department of

Energy. Office ofConservation and Renewable Energy, Mail Station, CE132, Forrestal Building. 1000 Independence Avenue, Washington. DC 20585, (202) 252-9127 Eugene Margolis. Esq" U.S. Department

ofEnergy, Office ofGeneral Counsel, Mail Station GC-12. Forrestal Building, 1000 Independence Avenue. SW, Washington. DC 20585. (202) 252- 9513 Background

The Energy ConservationProgram for Consumer Products (other than automobiles) was established pursuant toJheEnergy Policy and Conservation Ad (EPAC), Pub. L. 94-163. 89 Stat. 917,
as amendedby the National Energy Conservation Policy Act (NECPA). Pub. L. 95-619. 92 Stat. 3266. which requires DOE to prescribe standardized test procedures to measure the energy consumption ofcertainconsumer products. including central air conditioners.The intent ofthe test proceduresis to provide a comparable
measure ofenergy consumption that will assist consumers in making purchasing decisions. These test procedures appear at 10 CFR Part 430. SubpartB.

DOE has amended the prescribed test proceduresby adding 10 CFR 430.27. Petitions ofWaiver, to allow the Assistant Secretary for Conservation andRenewable Energy temporarily to waive test proceduresfor a particular basicmodel. 45 FR 64109 (September26. 1980). Waivers may be granted when
one ormore design characteristics ofa basicmodel eitherprevent testing ofthe basicmodel according to the prescribed testprocedures, or lead to results so unrepresentative ofthe model's true energy consumption as to provide materially inaccurate comparative data. Waivers generally remain in effect until final test procedure amendment become effective, resolving the problem that is the subject ofa waiver.

Trane's petition seeks a waiver from the DOE test provisions that require testing at a single compressor speed. Tranerequests allowance to use AppendixBofthe Air Conditioning and Refrigeration Institute (ARI) Standard 210/240-84 with amendments. The amendments to ARI Standard 210/240- 84requested by Trane include revisions to cyclingperiod and intermediate steady state test point. The intermediate speedproposed by Trane matches system capacity to building load at 87 OF. Also, Tranerequests the allowance oftest and calculation procedures which incorporate test data for system operation atminimum and maximum speeds.

Pursuant to paragraph (b) of10 CFR 430.27. DOE is hereby publishing the "Petitionfor Waiver" in its entirely. The petition contains no confidential informationDOE solicits comments. uata. andinformation respecting the petition.

Issued in Washington. DC September 11. 1986. John R. Berg. PrincipalDeputyAssistantSecretary. CotfservationandRenewableEnergy. July 9, 1986. Assistant Secretary. Conservation and Renewable Energy. UnitedStatesDepartmentafEnergy. 1000 IndependenceAvenue, SW

.. Washington. DC20585. Gentlemen:This petition for waiveris being submitted pursuant to 10 CFR. Part 430.

### Federal Register 

## I Vol. 51. No. 192 

## I Friday. October 3, 1986 

## I Notices 35411

Appendix Mto Subpart B, Test Procedures for CentralAirConditioners. Including Heat Pumps. Waiver is requested for Trane'sITS/ TWS model variable speed cooling-only products and heat pumps in the cooling mode.

Models in the ITS/TWS product lines use variable speed motors to drive the compressor, indoor blower, and outdoorfan. The compressor is controlled over a wide range ofspeeds: the indoor blower and outdoorfan motors operate over a smaller range. Modulation ofall three motors allows the system to better meet specific load requirements, thereby minimizing energy use. The system requires use ofour microprocessor design in conjunction with a special thermostat. offering a wide range of additional energy conservingoptions.

York demonstrated (CaseBEE-1338. January 13. 1981) that the current two-speed rating procedure did not adequately represent true seasonal performance and efficiency ofa variable speed system, and was granted permission to use a modified test and rating calculation procedure for theirENMOD heat pump products. ARI has sincepublished a revised standard (ARI 210/240-84) that incorporates variable speed test and calculation procedures, almost identical to the York method. and planstofurther edit and revise this procedure. Carrierrequested that they be allowed to use a modified version ofthe ARI/York procedures in their petition ofDecember4. 1985, which was published in the February, 1986 Federal Register.

We believe the York!ARI procedures tobe the fairest method ofestimatingvariable speed system cooling performance. However. the York/ARI procedures require further clarification for laboratory repeatability and verification purposes. Carrier attempted to address this issue in theirpetition. but some oftheir proposed procedures, such as the "floating intermediate point" testing. were not specific enough to ensure a consistent interpretation oftest data for rating of variable speed products. Furthermore, the Carrier petition appears tobepredicated on the specific design details oftheir intended product offering.

This petition is a request for authorization to substitute the test and calculation methods, with some minor modifications. of AppendixBofARI 210/240-84 for Appendix M. Subpart BofPart 230 as applied to the cooling mode ofvariable speedproducts.The modifications proposed herein are independent ofdesign details ofany specific system. and are offered as a universal rating procedure for variable speed air conditioners (and heat pumps in the cooling mode.) A subsequent petition will be submitted. as appropriate. for rating ofheat pumps in the heating mode.

The proposed rating method and modifications. to ARI 210/240-84 are described below andfurther detailed in an attachment. Graphical representations ofthe requested procedure can also be found in the attachment.

1. Two steady state test points atboth minimum and maximum speed are used to establish a pairoflines that describe the extremes ofthe operatingrange as a function ofoutdoor temperature for both capacity and energy usage. The specific points and equations for the lines are defined in ARI 210/240-84. Appendix Band in the attachment. Proposed procedural clarifications are as follows:

A. Rated capacity for the system will be based on the tested capacity at anindoor condition of80 OF drybulb and 67 OF wet bulb and an outdoorcondition of95 OF dry bulb. maximum speed. with minimum indoor static pressure requirements as defined in ARI 210/ 240-84. Section 5.1.3.6.

B. We propose that indoor airflow at speeds lower than maximum be determined by using the fan laws for fixed resistence systems. The ratio ofmeasured fan speed to maximum fan speed is multiplied by the volumetric airflow rate at maximum speed. Minimum static requirements only apply at the capacity rating point (Test A. Table 1in the Appendix). This modification was also requested in Carrier'spetition.

C. Outdoorairflow is as determined by the unit controls. Neither CarriernorYork addressed variable outdoor airflow.

2. Abuilding cooling load line. described by Equation 1in ARI 210/240-84. Appendix B. and the attachment. is applied to the minimum/maximum operating lines so that the distinct operating modes (Le.• max. speed operation vs. load matching vs. cycling) can be established. No modifications in the building cooling load line arerequested.

The temperature intersections ofthe bUilding coolingload line and the maximum speedand minimum speed lines define the modulating speedrange ofthe system. At temperatures above theintersection ofthe load line and the maximum speedline. the system will operate continuously at maximum speed. At temperatures below the intersection ofthe load line am! the minimum speed line. the system will cycle on and off.

3. Additional intermediate points in the loadmatching area could be tested to more accurately describe the system's energy reduction at lower speeds. Ourtesting confirms the work done by York. which indicated that a linearrelationshipfor an energy approximation in the load matching
area does not adequately reflect the reduction in energy usage at the lower speed range. This deficiency canbe substantially eliminated by measuring the energy consumption at a test condition which matches system capacity to bUilding load at 87 OF. This approach is consistent with both the York petition andARI 210/240-84. However. neitherofthese references stipulated a tolerance for acceptability ofthe match between the load line and the system capacity. Ourproposal is that this match be defined by:

A.1fthe measured capacityis within 1% of the calculated building load at 87 'F. then the testedpoweris used as described in ARI 210/ 240-84. Case II Calculations.

B. Ifthe measured capacity is within 3% but not withn 1% ofthe calculated building load at 87 OF. then another test point is run perthe procedure below. and the power at the 87 OF bin is interpolated based on the two points and the calculated cQoling buildingload at 87 'F (details in attachment).

1. Ifthe first tested capacity falls above the buildingload line. then the speed is lowered so that the second test capacity is below the building load line and within 3% oithe line.

Z.Ifthe first testedcapacity falls below the buildingload line. then the speed is raised so that the second test capacity is above the buiding load line andwithin 3% ofthe line.

C. A measured capacity that is not within 3% ofthe calculated building load at 87 OF is unacceptable. and the point must be rerun.

In contrast to this proposal. Carrier's test/ interpolationprocedure appears to havebet!n written for their specific system. It is unfair to
assume that all variable speed systems will have similarspeed range and otheroperating characteristics. There may be significant differences in operating characteristics which make it difficult to specify an intennediate testby .peed.Testingbased OD building load. 

# a. in the York/ARI procedures. will be more applicable to a broaderrange ofvariable speedproducts.

4. Using the system powerateach extreme ofthe load matching region and the measured powerat the intermediate point(sJ. the power atthe bin temperatures in the load matching region canbe approximated using a series of straight line relationships.This procedure is described in ARI 210/240-84. Appendix B. Case II Calculations and in the attachment. No modifications to it are requested.

5. For the portion ofthe load line where the unit is cycling. ARI 210/240-84. Appendix B allows the option ofusing a degradation coefficient value (Cd) of0.25 or performing cycling tests at the 67 OF bin temperature. which we agree is representative ofthe temperature range in which cycling actually
occurs for variable speed products. However. variable speed products will cycle less than single speedproducts.

A. We propose that the "on" time for cyclic testing be determined by the minimum "on" time allowed by the controls ormultiplying six (6) minutes by the maximum to minimum speed capacity ratio at**00/67~7.** whichever is longer. For example. a product having a 2:1 maximum to minimum capacity ratio at 00/**67~7** would betestedwith the longer of12 minutes orthe minimum "on" time allowed by its controls.This is consistent with the stated intent ofcarrier's proposal. but sets a specific procedure that canbe applied to a broaderrange ofvariable speed products.

B. We propose that the "ofr' time for cyclic testingbe determinedby eitherthe minimum "off" time allowedby the controls or thirty (30) minutes less the "on" time, whicheveris longer. This procedure. unlike Carrier's proposal. maintains a comparable 30 minute cycle for all systems when practical. and credits those systems whose controls allow less cycling.

6. Forthe portion ofthe load line where the unit is operating at maximum speed. both the capacity and powerofthe system at maximum speed. as determined by the el!tablished maximum operating line. are used as described in ARJ 210/240-84. AppendixBand the attachment. No modifications are requested.

Test data could be supplied to further demonstrste that the proposed method of rating variable speed products in the cooling mode is more representative ofthe efficiency

### 35412 Federal Register 

## I Vol. 51. No. 192 

## I Friday. October 3. 1986 

## I Notices

ofa variable spl:led system than the current two-speed ratingmethod.

. We understand that York's ENMOD model

variable speed system is no longerbeing offered. No othermanufacturer to our knowledge is domesticallymarketing a product that incorporates variable speed compressors. blowers. and fans in their design. Sincerely. L.E. Chaump. Vice-PresidentEngineering. Attachment I: Details ofRating Method for Variable SpeedProducts in the CoolingMode

This attachment is a revised version ofARl 210/240-84. Appendix B. The changes reflected herein are to adapt the appendix to theproposedrating method and to clarify notation and terminology.
BILLING CODE &450

..el1

....



### f

### Federal Register / Vol. 51. No. 192 

## I Friday. October 3. 1986 / Notices


## ATTACHMENT I: DETAILS OF RATING METHOD FOR VARIABLE SPEED PRODUCTS IN THE COOLING MODE

Test conditions and methodology for rating unitary air conditionin9 with variable speed compressors as diagrammed in Figure 1. 

# I. Test Conditions 35413



## 1.1 The tests and test conditions which are required to determine values of capacity ratings and values of measure of energy efficiency appear in Table 1.
1.2 The "on" time for cycl ic testing is determined by the minimtrn "on" time

" allowed by the controls or multiplying the maximum to minimtrn speed capacity ratio at 80/67-67 by six minutes; whichever is longer. qk-Z (67F) 

## "on" time :II: 55 

## (6)
It.:./ 

## (67F) 

# qss where 

# q;s"z (67F) is determined using 

# eq. (4)

q

# *-I (67F) is from Low Ambient Cooling Steady State Test,

u 

## Table 1.
1.3 The "off" time for cyclic testing is determined by the minimum "off" time allowed by the controls or thirty minutes less the determined "on" time from 1.2 above, whichever is longer.
1.4 In lieu of conducting the Cyclic Cooling and Low Ambient Dry Coil tests, an assigned value of .25 may be used for the cooling degradation coefficient, CO,
1.5 Minimum indoor static pressure requirements as defined in ARI 210/240-84, Section 5.1.3.6, apply to Test A in Table 1.
1.6 At speeds less than maximum, the indoor airflow is determined by the following equation:


# CFMk=v = RPMk=v CFMk=2 RPMk=z where CFMk=V 

# =Airflow rate at lower speed CFMk=2 :II: 

## Airflow rate from Test A in Table 1 RPMk=z :II: 

## Fan RPM from Test Ain Table 1 i 

## RPMk=v = 

## Fan RPM at lower speed

### 35414 FederalRegister 

## I V.oL 51. 

### No. 192 

## I Friday. October 3, 

### 1986 

## I Notices


# 2. Calculations (NOTE; Refer to 

# 81ft Analysis Method in 

# ASHRAE 116)
2.1 

# Cooling Seasonal Performance Factor. For variable speed compressor units the seasonal energy efficiency ratio (SEER) is found from the following equation:
II

# ~**q(~J** SEER = 1..: 

# 1

;"..;1_-**~** E(t,) i-I 

# The terms q(tj) and E(tj) as defined in ASHRAE 

# 116, summed over temperature b1ns, are evaluated at each temperature bin according to the three possible casees 1isted 

# below. The buUding coo11ng load 

# BL(tj) for 

# the three 

# cases is obtained from the following equation: eq.(1)



## .BL(t) = tj

- 

## 65 {q!;2 (9SF)] 195

- 65 Size Factor 

# where 

# q!s·2 (95)

- steady state capacity measured from Test 

# "A" in 

# Table 

# 1.

Size Factor • 

# 1.1 for 

# lOS Dversizing. 

# CASE I
Units operating at minimum compressor 

# speed (k-1) for which the steady state cooling**capacity~f(tj)is** 

# greater than or equal to the building cooling load BL(tj), evaluate the tollowing.
eq.(2)

qle.1 

# (82F)

- Ie-I 

# (67F)
Ie

- I 

## (t)= Ie

- I 

## (67F) 

# + ss qss 

## (t

- 

## 67) 

# qss I 

### C};s 

# 82

- 67 I



# where 

# q!-l (67F)

- 

# steady state capacity measured from the Low Ambient Cooling Steady State Test, Table 

# 1. 

# q!-] (82F)

- steady state capacity measured from Test 

# -8-1", Table 2.

- steady state capacity at the rnin'rnllll compressor speed intended for normal operation in the cooling mode at temperature tj.

### Federal Register 

## I Vol. 51. No. 192 

## I Friday. October 3. 1986 

## I Notices 

### 35415



## eq.(3)



## E:S-I (t:) 

# = E:S-l 

## (67F) 

# +

# E~.f·1**(82~~**

# =**~~;l** (67F) (t j - 

## 67)



# where**E~-I** 

## .(67F)- 

# the electr1·cal power input for the Low Pmbient Cool 1n9 Steady State Test.**E~.J-I** 

## (82F)

- 

# the electrlcal power input fr9lft Test -B-l-

- the electrical power input at the minimum compressor speed in the- cooling mode at temperature tje Cooling Building Load Factor
Cooling Part Load Factor

where C() is as defined in Chapter 9 of ASHRAE 116 with the Dry Coil Cool ;n9 Steady State test construed as -Test Cand the Cyclic Cooling Dry Coil test construed as Test D •. both run at minimlJll compressor speed. (See Table 1)



# q (t) = 

# X* -I 

# q* -I 

## (t) 

# n I

. .f.J I I



# where nj • is the number of cooling hours in the jth temperature bin given in ARI Standard 210/240.. 

# Append1 x A.

(

### 35416 Federal Register / Vol. 51. No. 192 

## I Friday. October 3.1986 / Notices



# CASE II When the compressor speed varies between the maximum (k=2) and minimum (k=l) compressor speeds (such that k-v, to satisfy the building cooling load a temperature tj' 

### (NOTE: 

## unit does not cYcle on 

## and off), 

## evaluate the following eQuations.**q~s-"** 

## (t,) = 

## BL(t,)



## where qk." 

## (t) • 

## steady state capacity delivered by 

## the unit at any speed between

U 

## minimum and maximum compressor speeds at temperature tj'
when tj**~** 

### 87-F



## where tz

- temperature tj at which**q~-1** 

## (tj) • SL 

### (tj) 

## found by equating eq.(l) and eq.(4) and s01y1n9 for tj' 

## E!.-2 (t2). 

## the electrical power input at max'il1lUll 

## COII'Ipressor speed at temperature t2 

## calculated from ceq. (S) •

## E~-" 

## (t,). 

## the electrica' power input required by the unit at temperature tj and some variable compressor speed between the minimum and maximum compressor speeds.

. E!.-" 

# (87F)· the electrical power input at 87f, from either equation (6) or equations 

## (7) and 

## (8).

When the measured capacity at the 

## intermediate test point (Table 

## 1),

# q~;~'(87F)' is 

## within lS 

## of BL(87F), 

## then

eq.(6)

f

### Federal Register / VoL 51, No. 192 

## I Friday, October 3.1966 

## I Notices



## When two intermediate points are measured, where one measured capacity,
kaWI • • ",aVZ QUI 

## (87F), is wlthln +3% of BL(87F) and the other, 

# q"z (87F), is within -3% 

## of BL(87F). then·**E~$-'"** 

### {87f) 

### is**evaluat~d** 

### \Ising 

### i!q.(7) and**{B)~** 

### .



## eq. (7) 

## WEIGHT •

eq. (8)



## When tj<a7 a

### f k-vl 

# qS;1 (87F)- BL{87F)

# q~:~{87F)-**q~;2{87F)**

E"-] (t ) - 

## E"·" (87F) E*-" (t) = 

## E*-" (87F) 

# + 

# ,u ! Q 

## (t

- 87)

IS I IS • 

### t;!

- 

## 87F '

where tl • tenperature tj 

## at

## ~1i:h**~.I** (t,) • BL(tj} 

## found by 

## equating eq.{l) and eq.(2) and so1v1ng for 

## tj. 35417



## E

k

- I 

## (t 1) • 

## the electrical power input at min1m\Jn compressor speed at**t~perature** tl calculated from eq.(3).



## q (t,) 

# = q:.,-" (t,)o,


# E (tt) 

## =**E~s-"** 

## (tJ Of

f

### 35418 Federal Register / Vol. 51, No. 192 / Friday, October 3, 1986 /Notices



## CASE III**~When** I 

## unit operates continuously at maximum compressor speed (k-2) 

## at an ou'tdoor temperature tj. evaluate the following equations:



# + q!-2(95F)

- 

# qsks·2(82F) ok

- 

# 2(82F) (t 

# 82)

- "'ISS 

# '95

- 82 " I -



## where**q~;2** 

## (t / ) • 

## steady state capacity at the maximum compressor speed at temperature tj. 

# q!-2 (82F) • steady state capacity from Test 

# "B-2", Table 1


# eq. (5) 

# Ek -2 

## (t) 

## = 

# Ek -,1 

# (8'F)

# +E~-2 (95F)

-

# E~s·l (82F) (t

- 

# 82)

ss I JS

- 

# 95

- 82 " where 

# Ek-:Z (t) • 

## the electrical power input at the maxim"" compressor speed at SJ J 

## temperature tj. '**E~·2(82F)** 

# • the electrical power input from Test 

# "B-2", Table 1**E~·:Z(95F).** 

## the-electrical power input from Test "A", Table 1

- 

# q (t,) 

# = q:s·2 (t,) 

# n, E (t) 

## =**E~s-2** 

## (t /

) 

# n,

, (

### CAS-RM-79-102 COMMENT 06

Federal Register 

## I Vol. 51. No. 

### 192 

## I Friday, rk\ober 3, 1986 

## I Notices 35419



### lAlil( 

## t.; Test Conditions



# . INDOQRCOll OUrDooR 

### COIL 

## lest 

## AIR 

## EHtERIHG AIR ENTERING 

# r**~ ~8**  -A- Cooling Steady Stat.

At M41imum (k-Z) COIIIpfeSSor SDHd 90 

## 61 9S



### -8-2- Cooling Steady St.tt

At Maximum'(k.Z) Compressor $pt.d 

# ao 61 

### 82



### -8-1- Cooling Steady State 80 

## 61 82



### At Min1mum'{k-U Compressor SDeed
Low Ambient Cooling**Stead~** 

### Stat.**~** 

# 6' 67

.



### At Minim'.II,dk-l) Compressor SDetd Ofy Coil cooling Steady Stitt 80 

### 57 4 

### 11



### At "in1mum (k-l) 

### ComprfSSor 

## Speed 3 

### 80 

### 57 4 

# 6' Cyclic Cooling 

## O"y Coil

At**M'nim~** 

### (k-l) 

### Compressor SCetd Intermediate Cooling Steady State2

At Variable (kay) 

### CompreSs(lf Spttd 

### 80 67 81



### All TISts Irt 

### perfOnlled It th. condense,. spted and 

## indoor blower 'J)Hd intended 

## tot nortIIa1 cp

...

## ,t1on. NOTES: 1. 

### Hot 

### maintained if 

### no condensate rejected to outdoor coil. Z. Compre'S\or speed 1s 

### selecttd to provide capacity as described 1n Case II 

### calculations; Attachment test conducted by cycl1ng compressor 

# .S descr'btd 1n Attachment I. Sect10nS 

## 1.l and 1.3. 

## 1. 4. 

### Wet bulb sufficiently low that 

### no condensate forms on evaporatOr.

IF'R 000. 86-2a418Filed 10-.2-116: 8:45 IIml
"WHO COOl

## '.!IOoO'-C .. . 

# r.**~8** 1s1



### 651

651

53.5 1

53.5 1

53.5 1



## 191