Man's physical universe

xanabras


F

278 PHYSICAL LIMITATIONS HAVE BEEN OVERCOME

erally suggested that 68° F. is the ideal temperature. Many people

have found that they feel cold at temperatures considerably higher than

this in the winter because the humidity is so low.

It is therefore desirable to add moisture to the indoor air in winter.

The humidity of the air is usually controlled by passing it through a

spray of water, thus adding water to dry air and removing excess water

from moist air. Many people do not realize that the humidity of hot

moist air can be decreased by passing it through a spray of cold water.

Moist room

Hot dry

Air to rooms

air 85

Silica -Gel

dchumidlficr

air 130

Air cooler

80°

Sili'cdt Gal

Outdoor

"air 95°F.

DehumidiFiad

Dehumidified

Silica

Silica Qel

cooler Gel

300'

Saturated

Silica Qel

Silica Gel

reactivator

'70'f " 78°F

In Out

Tap water

300 F Hot gases carrying

water vapour

dischard'ed to

atrnospnerc

120 F

Air out

Hot furnace

gases 450°

Purnacc

Fig. 93. Silica gel air conditioning system. (Courtesy of the General Electric

Air Conditioning Company.)

Various devices for adding moisture in the winter have been used with

rather indifferent effectiveness in the past. These devices include water

pans in hot-air furnaces, troughs of water heated by radiators, and

steam jets controlled by a humidistat.

One ingenious device for the control of humidity depends upon passing

air through a spray of a solution of some salt such as lithium chloride.

The vapor pressure of this solution can be controlled by controlling

the concentration of the salt in the solution, thus making it possible to

obtain any desired humidity. Such a solution would take excess moisture

from the air and would add the proper amount of moisture to air

that is too dry.

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