NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

1 03-20-4702 November 14, 1952 2062

PROGRESS REPORT

Air Cond iticming in Underground Structures

Tests Conducted up to October 31, 1 >2.

by

B* A* Peavy

Beating and Air Conditioning Section

Building Technology Division

The publication, reprinting, or rep from the Office of the Director, N which a report has been specific

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

Approved for public release by lire “SSKSSSS'S

Director of the National Institute of •' 111,1 r,’" rl f,r **"

Standards and Technology (NIS D

on October 9, 2015.

PROGRESS HCPOUT

Air Conditioning in Under -round structure a Tests Conducted up to October 31, 2952.

& brief swaary of the tests run at the Mount "-'eat er

pilot project is as follows?

Yost Condition 1 - *arw up period from April 23 to

to May 15 *

An averago constant beat input of 6Qt $Q0 BTU/hr

to the chamber was maintained with no ventilation

or i#hu*i4ifl«atio» until the average temperature of

the rock eurfaees reached ?$*F* The observations

taken were air temperature, rock temperature* at

selectee depths and positions* heat input to H hts

and. boaters , and bumMl ty of the space.

Test Gend.it Ion 2 ~ -toady stste beating at ?6e

. air

te*per*t»re from Fay 1$ to June 10*

Test conditions were? air ter*- erdture approximately ?6 * F | |

• .util at . or de‘ m* OfeoerVattcM were the came as for teat condition 1.

Heat input to the chamber was regulated by a

hfep controller (each step feeinr 1259 watts)
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*»• hi«l lnrct rate 4«er**a#d fries &a f iO© to &*»

pr®ximt«Xy l&f m%l $Tt\4r in 20 gay#*

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' fro# the two geteai^i flora «s weifhag ang rc®©w*

. from the ahaaher* C%a#nrafcie»# were tr» #aa* a«

£Ja»4ifcl«»# t antf t* fh# afw&g*? haat

input rate to the lights ang 4afetusl£ifl«r# wa#

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?6ft T to ajtymxlastaly 63 *f It 3$ daya*

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'••. «Hrs» this ta»t outside air was introduced for

ventilation of the space while the rate of temperature
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drop was observed. The entering ventilation

air temperature runted from 57#5*F to 59.5**-

and the chamber air temperature was reduced from

63®F to 6l®F in 1$ days. .In conjunction with this

test, a study was made of the cool in; effect of

the mine tunnel cm the Mmer ventilation air.

Thfe temperature drop was observed at selected

stations la the 1? inch duct located in about

1100 feet of tunnel « Tamparature drops in the

.ventilation air duct were observed to be as high

as 2$*F. following Test Condition 4, refrigeration

vme used to bring the temperature of the space and

rock to a depth of 12 feet to approximately 56* f.

feat Condition 5 - rMrts up period from August H to

AU;'"0»t 16.

The condition© and observations for this tmt word

the sasne a© Test Condition 1 except the heat input

rate to the space was approximately 122,500 BTW/l r.

- The mraje .reek murtaf was raised from W* to

70*F in approximately 49 hoar©*

Taat Condition 6 - Steady state heatinr at, air

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The conditions and observations for this test

were the same as Test Condition 2. The heat

input rate to the chamber dropped from 122,500

to 51,200 iff /hr in 29 days*

Burinf the period from September 17 to October 1,

a test condition was maintained under which V. e chamber

was dehumidified and ventilated and occupancy was simulated*

Due to failure of electrical equipment t'hU test was discontinued and Test Condition 7 eowwncad on October 10.

Test Condition 7 - A test to determine hmt and moisture

load with no ventilation or simulated occupancy is

now .in progress.

The purposes of this test were to determine the

air conditioning capacity required to maintain 7$**

and J0£ R*H. , iaclwSlm reheat and sensible heat

required to maintain ?t*F in the space and the amount

of moisture condensed. Curing the week October 2fc~31,

the daily water condensation was approximately

pounds. Another week -will be spent on this test.

Preparations for other testing to be done concurrently

with those in the chamber are in progress. 'The bouse above

the shaft is nearly completed and the blower and motor are

ready for installation. The blower was designed for $Ci

9 QOQ

cfm or less through the mine tunnel and shaft . bone work
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has been done on the spray pond dam by the Bureau

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rira® is being held in abeyance • Calculation for theoretical, and practical consideration ar© being ©adapter all phases of test. inf

in the underground mi will be submitted in

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