EE-RM-TP-99-480 COMMENT 02HH

" 

JAN 24 '97 11:41 

c>L11"t-t 

Proposed ASHRAEIIESNA 

Addendum 90.1 n to 

ASHRAEIIESNA 90.1-1989 

ASHRAE® 

STANDARD 

ADDENDUM TO ASHRAEIlESNA 90.'·1989 

Energy Efficient 

Design of New 

Buildings Except 

Low-Rise Residential 

Buildings 

Second 

PUBLIC REVIEW DRAFT 

C199S AmerIcan Society of Heating. Reftf98nn1ng and Air· 

Conditioning Engineers. Inc. All righta reaarved.. 

AhhOugh reproduction of drafts during the public review period 

is encouraged to promote additional comment. permlaslon must 

be obtained to raprt)duce aU or any part of this doeument from 

the ASH RAE Manager of Standards, 1791 TulDe Circle. NE. 

Atlllnta. GA 30329; (404) 636-&100. 

AMERICAN SOCIETY OF 

HEATING, REFRIGERATING 

AND AIR-CONDITIONING 

ENGINEERS, INC. 

1791 Tullie Cin:le, HE • Atlanta GA 30329 

703 525 0718 PAGE. 02 
EE-RM-TP-99-480 COMMENT 02HH

Foreword to 90.1n: 

PropOKd ASHR.AEIIESNA 90,]" Addcodum to ASKRAElIESNA 90.1-1989 

Secood Public bvi8w Draft 

This addendum is being proposed to provide mere equilable treatment for service water 

heating equipment IJy requiring hot WaIer supply boilers to meet Ihe same requirements as 

water heaters. The reference to the test method for WaIer healers not covered by NAECA. has 

been updmed. The requiremenrs shall apply 10 hoI waIer supply boilers with input rarings 

from 300,000 Btulh to 12,500,000 Btulh. Definitions are added 10 Ihe standardfor water 

heaIers, hoI water supply boilers. and boilers. 

Only lhe proposed changes are open for comment aI this time. Deletions are indicaIed by 

strikeouts and additions are indicated by double underlining (text) or shading (Iable), unless 

otherwise Slated. 

Addendum: 

Add thefollowing definitions 10 3.4: 

waler heater: vessel in which water is heated and is withdrawn for use external to the 

system. 

hot water supply boiler: a boiler used to heat water _for purposes other than space heating. 

boiler: self-contained appliance for supplying steam or hot water. 

Change 11.4.2 EquipmenJ Efficiency 10 read: 

11.4.2 Equipment Efficiency. Hot water supply boilers with inputs from 300,000 to 

12,500,000 Broth and used solely for heating potable water, a:All water heaters, and hot 

water storage tanks shall meet the criteria of Table 11-1. Where multiple criteria are listedl 

all criteria shall be met. 

Exception: Storage water heaters and hot water storage tanks having more than 140 gallons 

of storage capacity need not meet the standby loss (SL) or heat loss (HL) requirements of 

Table 11-1 if the tank surface area is thermally insulated to R-6.5 (R-12.S as of January 1, 

1992) and if a standing pilot light is not used. 

JAN 24 '97 11:42 703 525 0718 PAGE. 03 
EE-RM-TP-99-480 COMMENT 02HH

TABLE 11.1 

Minimum Performance of Water Heating Equipment 

Input to T .. t Energy Thermal Standby 

Category Type Fuel Input Rating VT• VT Ratio Methocf Feetor'" Efficienc I.oss 

(Btw'h'P't' y %l'hr" 

E, 

Of. 

NAECA all elec1lic 512 kW aU' DOE Tast Pnx:. ~0.93-0.00 132V 

Covel1ild storage gas .575.000 BtuIh alf 10 ~.62,().0019V 

Water instantaneous gas S200.000Btulhc all CFR. Part ~.62,().0019V 

Heating storage oil 5105.000Bt....", all 430Z ~.5g.0.0019V 

Equipmenf instantaneous oil S210.000Bl""'" all ~0.59-0.0019V 

pool heater gas/oil all all ANSI Z21.56- C!78"f. 

1989-

Other storage electric all all ANSI SO.30 ... 27NT 

Water Z21.10.3.~ 

Heating storage! gas/oil 5155,000 BtuIh all <4.000 19~ ::7e"lo S1.3+114NT 

Equipment" instantaneous >155,000 BtuIh an <4.000 C!78% Sl.3+9SN .. 

<10 ~4.000 ::80% - ~10 ~,OOO ~77"to S2.3+67N .. 

hot waler gas/oil ~.OOOand <10 ~.OOO ~eO% 

supply boilers 512,500,000 BtuIh ~10 ~4.000 ANSI Z21.10.3, ::77% S2.3+67NT 

1~ 

Unfired 

Storage 

Tanks all ::a6.5 Stulh oft 

Note f 

·For detailed I1iIfel1ilnces see Section 14. 

I>Consistenl with National Appliance Energy Conservation Act (NAECA) 011987 and covered by the OOE water heater efficiency test 

procedul1ilS. 

'DOE Test Procedul1ils apply to electric and gas storage water heaters with rated volumes C!2O gallons and gas instantaneous water heaters 

with input ratings of 50,000 to 200,000 Bluth. 

dAn except those water heaters covered by NAECA. 

"When testing an electric storage water heater for standby loss using Ihe test procedure of Section 2.9 of Z21 .10.3499Q1993"', Ihe electrical 

supply voltage shall be maintained within ±1 % of the center of the vottage range specified on the water heater nameplate. 

Also, when needed for calculations. 111e thermal efficiency (E,) shall be 98%. 

When testing an oil water healer using the test procec:fures 01 Section 2.B and 2.9 of Z21.10.3~1993"', the following modifications WIll be 

made: 

A vertical len9111 of Hue pipe shall be connected to the flue gas outlet of sufficient height 10 establish the minimum draft specified in the 

manufacturer's installation insl'NClions. All measurements of oil consumption will be taken by instruments with an accuracy of il "10 or 

better. 

The bumer rate shall be adjusted to achieve an hourly Btu input rete within ±2% of the manufacture"s specified input rate with lhe CO, 

l1iIading as specified by the manufac:1urer wi1h smoke no greater than , and the fuel pump pressUI1il within ±1 % of 1118 manufacturer's 

specification. 

" 

'Heat loss of tank surface area (BtIih.ft') based on 80*F water-air lemperature difference. 

gy is rated storage volume in gallons as specified by the manufadurer. 

I 

I 

I 

"'IT is the storage volume in gallons as measured during the test to determine Ihe standby loss. VT may differ from V, but it is within tolerances 

allowed by the applicable Z21 and UL standards. Accordingly, for the purpose of estimating the standby loss requil1ilment using the rated 

volume shown on the rating plate, VT should be concemed as no less than O.95V for gas and oil waler heaters and no less than O.90V for 

electric water heaters. 

JPN 24 '97 11:42 7133 525 0718 PAGE. 134