/O 0

NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

1003-30-4?^ January £1, 1953 2213

Progress Report

July 1 to Timber 31, 1952

on

RSPHIOEMTIOK AHD MISCSLLAIIEOUS EQUUKSST

by

C. W. Phillips

S* Karger

P. B. Aehcnbach

Heating and Air Conditioning Section

for

OFFICE OF THE ^UABTEJmSTHB OEHERAL

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

The publication, reprinting, orrepu

from the Office of the Director, Nat which a report has been speclfical

Approved for public release by the

Director of the National Institute of

Standards and Technology (NIST)

lited unless permission Is obtained In writing

n is not needed, however, by an agency for

of that particular report for Its own use.

on October 9, 201 5.

Progress Report

July 1 to jecea&er 31* 1952

lent Heater Ian -Samples

•Two different types of propeller fans were tested to determine

relative efficiency, power input, and capacity. Both specimens were

intended Tor use on a gasoline-fired tent heater to circulate the

heated air. One specimen was a forrington fan, the other a derasanHelena faa. Considerable difficulty was experienced la measuring

power input since the £m 'was mounted on the engine abaft sad the

engine body was located directly in the fan inlet, furs sane it

necessary to use an actual engine tody with a shaft extending through

the engine to the dynaaioaseter shaft. fan opacis.cn f {forrington) on

the hot run with open duct moved 2150 of® (corrected to standard air)

with l.§3 total horsepower input (measured at engine coupling) and on

the cold run with open duet moved 2193 cfm with l.?G horsepower input;

and fan specimen 5 (Hercaa~IalsoiiJ[ at corresponding conditions moved

8035 ofa with 1.16 horsepower input and 2100 cfa with 1.23 horsepower

input. Fan speeds were held at 34>Q rpm. These tests were repeated

using a different tent heater, manufactured by Silent-olow* rue results

obtained could not be correlated with the results obtained with the

dermn-Selsoa tent heater, and it is believed that this might be due to

different internal construction of the two heaters, and the positioning

of the fans within the shroud,

lerr Ma-'i-house
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Kerr warehouse

The 'tests on the warehouse uianui'acturea by A. H. Kerr Company

were completed. For the first teat to determine the teat transmission

coefficient, all cracks between panels, boor, etc. and other openings

ware sealed with masking tape and shellac. The u-Factorfl for this test

was 6?.£ Btu/hr ( F temperature difference) . For the second teat, all

of this sealing mtericu. was reeved anu the heat traasadssion coefficient

was 64.3 Btu/hr ( “F teaperature difference)

Brown warehouse

lasts were made of a noadnal lpy-eu ft warehouse to determine its

overall heat transmission coefficient, fids warehouse was mauiacwurcD

by the Brown Trailer company, Bpokam, Washington. it was of the nondeiuoantable, portable type, and was provided with an opening for the

refrigerating unit. An access door was provided on the opposite side

of the refrigerating unit opening. The heat transmission coefficient

of this warehouse was found to be 87*1 Btu/hr per degree temperature

difference. 'She opening of the refrigerating unit was blanket: off for

tni& test with a panel of 3/k-i:;ch plywood.

Xtermo-King Plug-type Befrlgerating Unit

Operational tests were made of t. model fhe^o-Klng plug-type,

electric motor-driven refrigerating u.tit for use with portable or

deiaountaule warehouse®. The unit ms manufacfared by the ..i Serei

Control Company of i4inneapolis, Minnesota. ?wo iater-ccamecteo. hermetic

r.utor-coiapressor unite were employed to famish capacity range. The

observed capacity with both compressors in operation at 70 f ambient

temperature was 2400 Btu/hr with air entering the evaporator at a
TtOJ!

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temperature of -19.5% 4300 3tu/hr at 0% and 9700 Btu/hr at 3j>%

Teats were also made at ambient temperatures of 90% 1X0 % and 125 * F,

with air entering the evaporator ranging fro© 0

oF to 35 °F. Capacities

observed during this second series of tests ranged between 2900 and

£300 Btu/hr.

Tests have commenced on the Thermo-King and Carrier l/3«toa

,

' •

. V: ,: -.V ,

. refrigerating units to determine capacity and operating characteristics

for speeds ranging from 25 percent below to 25 percent above the rated

speed of the units.

26-cu ft Kefrlgerator

Tests were made on a 2o~cu ft portable, chest-type freezer aanu-

: V , Vw i iv VC s .;.y factored by bsery-Thompson Machine and Supply Company, lew York, 1, 1.

The freezer was equipped, with a 1-HF Copeland siechanjeally-seetlect hermetic

condensing unit. Tests were made to observe the lowest box temperatures

obtained at ambient temperatures of 7$% 95% and 120% in addition,

observations were made of the pull-down characteristics of the

- refrigerator at ?0°F ambient temperature. The lowest box temperatures

obtained were -33.2% -22.1% and -6.8% at ambients of ?G% 95%

and 120% respectively. At an ambient temperature of ?0% the pulldown time from 7Q

!,F to 0*F was £0 minutes, to -20*F was 2 hours, to -30 F

was 3-1/2 hours, and -38 T was 9-1/2 hours.

Brlfreca ifefrigeraab Dehydrator

Tests have been completed to determine resistance to vibration of

a refrigerant dehydrator known as Drifrces , manufactured by the Bern

Corporation of Bichmond Hill, lew York. The dehydrator was operated for
-% :i viiVtf* ' O', < -to 3* sdSpM ':-‘,Z& 'rito mcaswf

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more than 100 hours during a vibration test at 3300 eycles/ml . and

m amplitude of 0*0375 Inch. lo breakdown of the test samples was

evident at the conclusion of this test.

Pests to determine the rate of moisture removal, end drying ability,

and total moisture removal capacity of the 3/8 in. line size Drifreea

. have bean completed, this size dehydrator employ® approxtaately 43.5

grams of calcium carbide as the desiccant, fhis six© appears to be able

to remove approximately 20 grams of water from, liquid CCl^Fg refrigerant

with a final system vetsees of about 60 parts per million. An end dryness

of less than 6 ppm under ideal condition* appears to be possible with

this desiccant, fhe rate of drying appear* to be slow, the sample

tested required 3 days to remove 2> gram© of water from the test system,

the method assayed to determine moisture content of the refrigeration

system was the Electrolytic method, as developed by the Chemistry Division

of the national Bureau of Standards. 'The tests were made with the

cooperation of the Chemistry Division. Initially, difficulties were

encountered in adapting this moisture measuring method to a refrigerating

system, and this accounted for some delay in the testing. Moisture

determinations employing the Hvosphoroas Pentoxi&e method were made by

the Chemistry Division for comparison, with the electrolytic method.

•fasts were begun to determine the possible explosion hazards of

this dehydrator, as acetylene gas is formed by the reaction of water

with the desiccant. 'Phase tests are about completed.

Refrigerator Doors

Work has commenced on planning tests of refrigerator doors to

determine temperatures on inner and outer surfaces and around the gasket
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construction. Panel frame have been designed in 'which the door

test specimens can be mounted for insertion into a panel warehouse.

Plans have also bean drawn up for the refrigerating units required

to produce the low temperature conditions within the warehouse.
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