Man's physical universe

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AIR CONDITIONING 275

Paul then experimented with various methods for relieving the discomfort

of those in the cabinet. First he dried the air, then he cooled it, and then he

put it in motion with a fan. He made no chemical change in its content,

however, but the sufferers were almost immediately relieved.

This revolutionary idea of ventilation proved that the discomfort felt by

the persons in the cabinet was due not to breathing, but, primarily, to heat

stagnation — inability of air which is too warm, too moist, or too quiet to carry

away bodily heat — a vital contribution to the science of Air Conditioning.^

Fig. 90. The house on the right has been insulated while the house to its left

has not been insulated.

On a hot day with a temperature of 80° F. and a relative humidity of

86 per cent, working capacity is reduced approximately 25 per cent,

the appetite reduced 13 per cent, and general discomfort ensues.

Ideal

conditions for most people are about 75° F. with a relative humidity of

about 50 per cent, although the ideal indoor temperature is controlled

in part by the outdoor temperature.

The Temperature of the Air Must Be Controlled.

Complete year-round air conditioning must include provision for

heating the air in the winter and cooling it in the summer.

The most important problem of indoor weather in the winter is that

of maintaining the proper temperature. So important is this problem

that other factors are overlooked, with a consequent loss of comfort.

In cold climates the money spent for fuel can be decreased by insulating

against loss of heat. It pays to fill in between the walls with

' From booklet entitled This Thing Called Air Conditioning. (Courtesy of the Minneapolis

Honeywell Regulator Company.)

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