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8 TRG-TRC001-EN
notes
period one
The Psychrometric Chart
Notice that the point of intersection falls between two relative humidity curves:
40% and 50%. By interpolation, the relative humidity at this condition is
approximately 47%.
Constructing a Simple Psychrometric Chart
To better understand the psychrometric chart and show why the lines intersect
as they do, we will construct a simple chart.
The amount of moisture contained in saturated air depends on dry-bulb
temperature. This table shows the maximum amount of water vapor that one
pound of dry air can hold at various dry-bulb temperatures. For example, at
25°F, one pound of dry air can absorb and hold 19.14 grains of water; at 30°F it
can absorb 24.19 grains; at 35°F it can absorb 29.94 grains; and so on. Each of
these conditions is a saturation point.
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Figure 15