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TRG-TRC014-EN 1
notes
period one
What Is Variable Air Volume?
A variable-air-volume (VAV) air-conditioning system varies the volume of
constant-temperature air that is supplied to meet the changing load conditions
of the space.
For the purpose of comparison, we will look at a traditional constant-volume
(CV), variable-air-temperature system.
This system delivers a constant volume of air to the space and, to maintain the
required space temperature at all load conditions, varies the temperature of this
air. In this example, the temperature of the air is varied by controlling the
capacity of the central cooling coil.
VAV Systems
period one
What Is Variable Air Volume?
Figure 2
Constant-Volume,
Variable-Temperature System
space
OA
supply
supply
fan
fan
SA
cooling
cooling
coil
coil
thermostat
thermostat
RA
Figure 3