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30 TRG-TRC001-EN
notes
period four
Air Quantity
Next, we will determine the flow rate of supply air necessary to maintain a
given set of design room conditions.
Before proceeding, one more set of curves on the psychrometric chart must be
identified. These curved lines represent the changes in dry-bulb and wet-bulb
temperatures as air passes through a “typical” cooling coil. These are
commonly referred to as coil curves; they depict approximate coil
performance. Exact coil performance depends on the actual coil geometry and
can be precisely determined by coil selection software.
These curves were established from hundreds of laboratory tests of various coil
geometries at different air and coolant temperatures. They let you determine
leaving-coil conditions and postpone coil selection until the final design. The
use of these coil curves will be discussed later.
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