NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

1003-20-4832 December 4, 1953 2956

TESTS OP REFRIGERAT I Oil A1TD

MISCELLANEOUS EQUIPMENT

Progress Report

July 1 - November 30> 1953

by

P. R, Achenbach

C. W. Phillips

Heating and Air Conditioning Section

Building Technology Division

for

OPPICE OP THE QUARTERMASTER GENERAL

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

The publication, r

unless permission

25, D. C, Such pc

cal ly prepared If

Approved for public release by the

Director of the National Institute of

Standards and Technology (NIST)

on October 9, 2015.

r In part, Is prohibited

itandards, Washington

eport has been specifireport for Its own use,
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PROGRESS REPORT

TESTS or REFRIGERATION AND MISCELLANEOUS EQUIPMENT

OFFICE OF THE QUARTERMASTER GENERAL

JUly 1 • November 30, 1933

Drifreez Dehydrator

The final draft of the report on the performance of several

models of the Drlfreez dehydrator Is about half completed. This report

will be completed in the next two welts. It will present results on

drying tests, vibration tests, and a discussion of possible hazards

from the use of calcium carbide as a refrigerant drier,

longstreth Compressor Tests

It was determined in conferences with representatives of the

Office of The Quartermaster General not to modify the test installation

of the Longstreth compressor to permit testing at speeds up to 4,000 rpm.

The investigation ms terminated and a rough draft of the report on this

Item ha® been completed and is now under review.

Gasoline Lanterns

The data were analysed and the report submitted, under date of

July lkf on two prototype inverted gasoline lanterns for operating

characteristics at -h5*F> 70°F and 1$3®F ambient temperature. The

results indicated that the test specimens, which were not new, would

not light at -25*Fj did not give sufficient light at normal room

ambient temperatures and produced dangerously high pressures at

ambient temperatures higher than 135

eF.

A third specimen of the inverted lantern, as submitted by the

manufacturer, was tested for pressure relief valve characteristics as

well as luminosity, in the presence of representatives of the Office of
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The Quartermaster General and the raanufacturer. A report of the

results obtained ms prepared and transmitted to the GQMG under date

of August 12. Results on this new specimen Indicated that the pressure

i relief valve would operate satisfactorily when carefully fabricated

and with a good valve sufficient light would be emitted at normal room

ambient.

Tests were made and a report submitted to the OQ&S, under date of

October 21, on a method, for reducing breakage of mantles in a standard

pressure gasoline lantern. Results indicated that a spider of the

proper dimensions used In a bored-out saantle tip assembly practically

eliminates mantle breakage when lighting.

Federal Specification AA-B-fflJbc

Replies to an inquiry addressed to members of the refrigerator

industry were received during the past quarter, and the work of

revising this Federal Specification has been started. The information

obtained from industry includes a summary of construction features

and descriptions of special components furnished on commercial models

of refrigerators.

Gasoline Tent Heaters

A final report is about half completed oa the performance of

four specimens of the propeller fan when used with tent heaters

cmnufactured by two different companies. The report will also show

the effect of fan position In the shroud on the performance of the

several fan blades as well as a comparison of the dimensions and

pitch angle of the several specimens. A calibration was made of two

test ducts supplied as field test apparatus for future evaluation of

heater performance and the static pressure resulting at the heater
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outlet for several arrangements of the canvas ducts ordinarily furnished vith

tha heater will also be reported,

imfrosting Tout

fusts of the defrosting characteristics of the current design of

the ].~t©» gasoline drives mrefcouee refrigerabiha unit ( "’her® Flag

Model M$-5l) nr* presently being eeadacted. Conditions being studied

are?

e s With automatic control of defrosting cycle.

b, with »ml control of defrosting cycle.

e. At 35* * refrigerator temperature.

4. At O* F refrigerator temperature.

lit# first phase, with am empty 600 «ra ft warehouse, fe»s “been complete*. A second phase vith a loaded earphones is yet to be dose. Ail

tests were run at 60 percent ft,l, At 35° F refrigerator teiape future,

the defrost cycle on aatomaUe control occurred at intervals of appro*!-

stately 4 l/$ hrs* lasted from 16 to IS minutes -raid the eonden•••.-*-• te fro®

each defrost varied from 26 to 36 lbs. tlader manual control, the time

repaired to block the ceil vith sufficient ice to reduce the unit

refrigerating capacity to approximately 665c Wilfhr w- * 36 hr?, and

the amount of condensate collected was nearly 69 lbs, fifty minutes

were required to defrost and the warehouse temperature rote to -*0° F

luring defrost.

At oa F refrigerator temperature* Hie frequency of defrost cycles

under automatic control «s once ner 4 l/2 hr®, the defrost period

varied from 12 t© 1? minutes , «n& eendenaate ranged from 2 1/4 to
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to bloc* the coll with sufficient lea to reduce the capacity to

*fmro*i«etely 7200 BHi/hr was in excess of 85 hr*, *»d the wmrnt of

condensate mi 23 3/4 lb*. the refrigerator temperature 1*0 ?« to 5C- ; F

during the defrost period which la*ted flyout 2f> minutes . tinder manual

control, the refrigeration i» started alter defrost hr the same tes>

peratare-iimt thermostat on the ev&porr. tor cell used, under automatic control.

The second phase, with the warehouse leaded * will he started soon.

l/2-Ton nua-?ygo Uait

feats to determine refrigerating capacity of the ho&el 1*10 fhermo

ling ga sol ice- dr ive», plug- type warehouse refrigerating unit at llfd1 f

ambient temperature and at refrigerator temperature* of 10* ? mod 35® f

hare been completed for s range of ce*s»ress©r speed* from lf<X> to

3000 *pm. Fan speed* varied proportionally,

& 600 cu ft warehouse eat mmi as a calorimeter, and had an

overall conductance of approximately 65 W&f®Wfhr, s.t 116® ? ambient

the lowest temperature the unit y?'« capable of producing in the test

warehouse was 6*f» ? at 1600 rvn (6900 BTtf/hr), 1 . T f at 2J00 ross

(7350 BfU/br) , 1,5” t at 2400 rpm (7350 BfB/hr), 3.? F *t ?700 mm

(7250 mifhr),sMi h.y f at 3000 rpss (7X00 BfP/fer}.

At litP ? ambient and 10® f refrigerator temperature, the capacity

varied fro* 6200 m/hr at 1S00 rpm, SSOO BISj/hr at 2100 rpm, 9200 WUfhr

at ?Uoo rpm, 9250 mfhr at 2J00 rpm to 9100 BfU/hr at 5000 rpeu
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oheortod eopaeitiee were 7700 WQfhr at 1825 rpm, 13350 m/hr at

2im rous, 16,900 rm/fer at 2^00 rpa, 16,800 B'W/hr at 2700 «g», and

12,500 MV/hr at 3C?00 n>*.

Air Matrttmtioa la ^efrigpretea ratter

Prellaia&xy iaveatigatiee of the llter&twe 1b regard to this

problem has been node, Installation of the trailer In tteo teat arm

h&s hem done m& tenperatore aaewriog theiweooplea have beea

Installed. the style of air velocity ne&imrisg device® far the low

re&ci teloeities hag hmn. elected and will ha oenstmeted at this

Wurem*

1/3-Too ialt

A 3 tad* of fee affect ©» eepaetty of a 1/3-toa (sosatael) gaso~

Uae~driv*a warehouse refirieerattn* wit (Model *>15& Vtene Xlftc)

of mri&iim of eeopreaeor Bpmi, hm hem eoapleted. tmte were »ad«

with the evaporator end fan spee&f verted 1b proportion to

the variation in engine speed m& with the fs» sspseds hold eoneteat

at two fixed rate®. Ml toe to were wade at 1X0® f esfcient and with

a ©^ f refrigerator tOMpmtavo,

4 report oo the perfowa»»e® of this wait is partially ©eapleied.
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