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TRG-TRC001-EN 7
period one
The Psychrometric Chart
notes
For example, let's assume that the summer design conditions are 95°F dry bulb
and 78°F wet bulb.
What is the relative humidity, humidity ratio, and dew point?
Only one point on the psychrometric chart represents air with both of these
conditions. This point is located where the vertical 95°F dry-bulb (DB) and
diagonal 78°F wet-bulb (WB) temperature lines intersect.
From this intersection, the remaining three air properties can be read from the
chart. Both the dew-point and humidity-ratio lines are horizontal and the values
are shown on the right side of the chart. In this example, the humidity ratio is
about 118 grains of moisture per pound of dry air and the dew-point
temperature is approximately 72°F.
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