Man's physical universe

xanabras

Silica gel is

AIR CONDITIONING 279

used in another successful method of controlling humidity.

Silica gel has very high adsorptive power because it exposes a very

large amount of surface relative to its mass. The silica gel is placed in

a slowly revolving drum through which humid air is drawn and thus

dried. At another location hot air is driven through the drum to

remove the moisture. An interesting fact to consider is that the humid

air is warmed by the condensation of the water vapor on the silica gel —

the Silica gel de-

(Courtesy of Pop-

a valuable consideration in the

wmter, but not desirable in the

summer.

Control of the humidity not only

adds to the bodily comfort, but

it also prevents the furniture and

windows from drying out and

cracking. Dry air robs the throat

and nasal passages of moisture and

renders them more susceptible to

colds, pneumonia, and influenza.

The air in many homes in the

winter is

often drier than that in

DRYING

CHAMBER

FOR AIR

STATIONARY PARTITION WITH

SEALS SEPARATES CHAMBERS

DRUM MAKES ONE REVOLUTION

IN 7 TO 9 MINUTES

^ .silica ceu

jk having

a moisture

Adriven off

ir

Ij-

J /HOT AIR

^//FROMQAS

T* HEATER

> HOT AIR

TO OUTDOORS

RECONDITIONING

CHAMBER FOR

SILICA GEL

the Sahara Desert. It is the drying

of the skin that produces the winter itch that is so annoying to

many people. (This itch may also be due to an unusual sensitiveness

to cold.)

It has been generally argued that this increase in humidity will lower

the fuel bill, but such arguments overlook the fact that the amount of

heat required for vaporization of the water to provide this humidity

the amount of heat saved by maintaining a lower

practically offsets

temperature. The amount of water that must be added to the dry

atmosphere in the winter to bring the humidity within desired limits

is surprisingly large. In an average home it involves the evaporation

of gallons of water daily.

Fig. 94. How

humidifier works.

ular Science.)

The Air Must Be Filtered.

One of the most difficult phases of air conditioning is that of dust

and dirt removal. Very small particles are very difficult to remove,

although human beings remove nearly 100 per cent of the dust from the

air that they breathe. Unfortunately this dust often contains materials

which are harmful to the lungs where it accumulates.

As much as two quarts of dirt have been filtered from the air in an

average home in one month. The removal of dirt from the air materially

reduces the amount of housecleaning and dusting required.

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