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NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

1003-20-47U April 17, 1953 2450

Progress Report

TESTS OF REFRIGERATION AND MISCELLANEOUS EQUIPtlENT

January 1 to March 31 > 1953

by

Henry Karger

C. W. Phillips

F. R. Achenbach

Heating and Air Conditioning Section

for

Office of The Quartermaster General

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

The publication, reprinting, or repioduc from the Office of the Director, Nation! which a report has been specifically f Approved for public release by the ' permission is obtained in writing

^ ^ ^ not needed, however, by an agency for Director of the National Institute of 'ii^t particular report for its own use. Standards and Technology (NIST)

on October 9, 2015.

Progress Eeport

TEJ3T3 OF EEFEIGEEATIOE km MISCSLLAHE003 SQtflF^MT

January 1 to March 31 i 1953

Office of The Quartermaster General

vjarehouse tJnlts (1/3 ton)

A series of tests of two 1/3 ton gascline-driven

warePoase refrigerating units .w'as begun to determine

the raiige-'^of capacities available by varying the coaipressor speed frop; 1^0 to 3000 rpis, both while holding

the fan speed 'Constant at desijofi speed and while varying

the fan speed in proportion to the compressor speed.

One of the ti^ 1/3 ton units being usee' for this

series of tests is a rheririo King Model Q15G and the other

is a Carrier t^del D731-9644.

‘' The tests of the Carrier unit were conspieted for a

range of compressor speeds while the evaporator fan was

driven at constant speed by the electric motor norj<^ally

furnished as a part of the unit. The tests of the Thert^o

King unit were completed for a range of compressor speeds

with the evaporator fan belt-driven from tre engine.

Tests with constant evaporator fan speed are yet to be

made
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A 1/2 ton unit laanufacturod by Tho U* S. Thermo

Control has been received for an extension of this

series to include the larger sice*

*^0rifrees^ Refrigerant I>r7er

Tests of the “Brifreea*^ ealclum-earbide refrlger-*

airt dehydrator were coa^leted during this quiarter*

The SMtnufacturer has redesigned the product at

least twice during the period of tests and has sublaitted one modification since the coi^letioiB of the

tests, apparently in order to correct deficient areas

of performance*

Reports of the various |:djases of this project are

being prepared* In addition to determining the relative

value of this product as a dehydrator, the question of

whether the acetylene-producing characteristic of the

desiccant, calcium-carbide, made the use of the product

hasardous was Investigated* The possible feasard was

that an explosion might occur, either through the decomposition ©f acetylene, the ig^tion of acetylene-air

mixtures, or the self-igniting explosions of copper

aeetylide, If fo^ad*

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I Tent Heater -

The teste wade to evaluate perfomance of. various

fane for. the gasoline tent heater were completed during

this quarter. Performance of fan samples identified as

JAh'-l, 2 and 3 was measiired, and in general required less

horsepower/cfm than the standard sample. The amount of

air delivered at the open-duct condition^ r was less for

the JAM 1-3 series than for the standard fan (sample S).

Because of the possibility^ during manufacture of the

tent heaters ^of having the fan blades mounted in various

positions with relation the fan shroud, a series of tests

was made to determine the effect of moving the fan In and

out of the fan shroud.^ The fan position was altered by

elongatiJi^ the engine mounting holes in the base. A

total change of position of 3 A** was obtained relative? to

the innermost position of the fan in the shroud. In

general, this innertnost position geve the lowest horsepower in relation to the air delivery but delivered less

air at open-duct ‘condition than at positions further out.

' As part of the fan tests, calibrations were made of

a set of field test ducts to determine air delivery vs,

stP'^itlc pressure. These ducts are intended to be used to

check air delivery of tent boaters In the field and in

production.
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T«ESts were made to detenr;ine the relative

pres'.7’are drop in th^ air circuit <?f two competitive

tent heater®, one sanufacturod by Herf^ian ielBon

V Company, the other by The Glow Oil Burner

Corpor&tioiu*'

Summaries of the test results and preliminary oer«

formance curves for all of the tests have been furnished to the interested personnel of The Office of The

:;^uartermaster General during the quarter.

Calorimeter

The ^secondary refrigerant calorimeter was checked

r out for proper operation preparatory to calorimeter

tests of the smll radial eospressor sufeiiitted for test©

by longatreth jSnterprises, la, dolla, California. This

compressor ii rated by its rianufacturer at l/2 HP 6000

Bbu/br capacity, but no operating conditions are specifled. A serievS of tests of this compressor for a range

of speeds and a range of corspresslon ratios will be

started icas^ediately.

hydraulic Drives

A preliminary investigation was made of certain aspects of the development of a hydraulic drive system for

certain gasoline-engine-driven, portable
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units which now use beltinit, couplings, aiid other devices to transmit power to the various driven components.

A pronosai for this work has been submitted to

Water ^voolers

Tests on one electric drinking water cooler manufactured by Frigidaire Division of General Motors for

the Chicago Quartermaster Depot to determine compliance

with the performance requirements of Federal Specification

00-0- 566b were completed. The coaler did not meet the

thermostat requ'^rement of the specification, k second

thermostat, installed on the cooler by a representative

of the mnufacturer , did not comply with the requirements

either; however, further tests were not made of this

cooler. The reT>ort on this cooler, as well as two reports on tests of coolers previously done for the

Chicago Quartersaster D®not , have been issued to the

arsncy requesting the tests.
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