Use and Care Manual

Wet-bulb temperature is measured using a wet-bulb thermometer, which is an

ordinary liquid-in glass thermometer whose bulb is enclosed by a wick moistened

with water, often called a sling psychrometer. The psychrometer is whirled around

in the air. If the air is not saturated (100% relative humidity), the water in the wick

evaporates and the water temperature falls below the dry-bulb temperature. Figure

2 shows the wet-bulb temperature lines on the psychometric chart.

9.0 How evaporative cooling works:

In order to have an understanding of how the COOL-SPACE® portable evaporative

cooler works a basic understanding of psychrometrics is necessary. Psychrometrics is the

branch of thermodynamics devoted to the study of air and water vapor mixtures. The

psychrometric chart is a graphical representation of properties of moist air. To illustrate

how the COOL-SPACE® unit operates, some of the relevant properties are described in

this section followed by a sample application.

Figure 1.

Figure 2.

Dry-bulb temperature is measured with an ordinary

thermometer. Dry-bulb temperature lines on the

psychrometric chart are the vertical lines shown in

Figure 1.