1
NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT MBS REPORT

1003-20-4707 April 17, 1953

PE0aEE3S Ri-PCHT

January to I'^arch 31 » 1953

by

F. J# Fowliteb, Jr.

Hosting and Air Ccnditianinr': ;>ection

a"or

Office of The Auartern.aater General

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

The publication, reprinting, 0 ApprOVCd for public rcfoaSC bv the prohibited unless permission is obtained in writing from the Office of the Directc p,.. xi • i ¥

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'mission is not needed, however, by an agency for which a report has been spi UireCtOF Ot the National IllStltUte 01 copies of that particular report for Its own use. Standards and Teehnology (NIST) on October 9, 2015.

Frofreiss Report

IS mmiQmkfm ^hP.mo\ism

>,..3 ... „ January I to r»«areh 31 , 1953

Office of The ^uartoriRaater General

Construction of the apparatus and Inst&llatior* of

the iBstrumentation and wiring was caifipleted. Callbration of the apparatus and operational tests of the comportent parts were started*

Operational tests were made on the refrigeration

systess. It was desired to operate the cold side as low

'V. i

.' as -^0 deg F mint&inim a minlRimi teisperstur© difference

between the air and coll surfac# to vrttmm mpMmmtion

of iieistisre within the box* A plot of relative hwsldity versus ?s,axiffiur allowable temperature differer.e# between the

air and coldeiJt surface to prevent condensation was prepared for a range of air tesjperature® -20 de§ F to

70 deg F* This plot shows at relative humidity and

-20 deg ? dry bulb, the maximum allowable temperature

difference to prevent condensation would be 6 deg F.

.v.'vniv:-r \-^4/ ' Preliminary rcfrl.gveration system tests showed that

.

' ‘v- water *n the refrigerant system was causing the expansion

valves to freese up- The water was r@j^ved with suitable

dryers* Further testa showed a need for Increasing the
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- 3 . rri^«ration control and proper temperature distribution* Ordera have hmn placed and installation will

atart upon delivery ol* aatiterialji*

A h<aat calibration for the warm side of the apparatus was started* Capillary tubes were installed between

tho warm box and the room and between the cold box and

the roofE. The purpose of these oapillar> tubes is to

equalise the pressur© on each side of the test p>anei

with the room pressure and- also to a«^it>air for a pressure teat of the seals of the apparatus before each test

These tubes will b# closed when steady te^^iperatures ar©

achieved on each side of the test panel* A test

for calibration purposes was constructed I'ro^ Zxit. framing -and fully insulated with fiber#tlass i.nsulatiOK*

Each -face af the test panel was covered with l/l6 inch

alusilnu® sheet as a vapor seal. The construction of

this panel is similar to that of the walla of the appara

tus. The test panel was in stalled and air pressure applied to the wans side* siaall leaks were indicated

and will be corrected before wB,ter-vapor tranami as ion

tests are started* Th© heat calibration tests are now

in prostresa*
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A sa;all oven vass for th^ regoneration

of the aillca gel <3e»iccarit at the ©nd of each test.

The design of a panel for j^lmultaneouss transisiasion. of heat mi4 v?ater-*vafor Kaa started.

A series of operational m<i calibri^,tior! tests for

this following purposes been started.

1. Meat c^UhTf^tiofi of war® sId#

a. 20 d«.r F below rcois t^Kperatnre

b. At rooai

e. 20 dtg F above room temperatt^ra with

humiditT controlled at 50:S

2. Vapor tightness test of oossplete apparatus

1. OperatSoral test of husi differ * dehmidifl-er

and their respective eantilewr.*

weighing device

4. Simultaneous tea?-, and watersvapor transEsission

test of a panel of known characteristics.
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