Man's physical universe

xanabras

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276 PHYSICAL LIMITATIONS HAVK BKLN OVLRCOMH

insulating material and to insulate in other ways.

great heat-savers, even better than weather stripping.

Storm windows are

Indoor air during the winter usually is abnormally dry; air before it

has been taken into the house has had most of its moisture removed

due to the low temperatures outside.

Of course, cooling may be obtained by cold well water or ice,

this is inadequate where cooling is required over long periods of time.

There are three general methods of cooling air: electrical mechanical

refrigeration, steam jets, and adsorption systems.

One of the world's largest air-conditioning jobs, that of the Tribune

Tower in Chicago, employs the steam-jet type of cooling-plant. Cooling

is obtained by spraying water into vacuum tanks, where rapid

Ejector nozzle

^T«P

Condenser

Purge

1

pump

mmm\Q

Expansion /

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