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76 TRG-TRC014-EN
notes
Now, we will review some of the main concepts from this clinic on variable-
air-volume (VAV) systems.
A variable-air-volume (VAV) air-conditioning system varies the volume of
constant-temperature primary air to meet changing load conditions in the
space. VAV systems can provide both fan and refrigeration energy savings at
part load, while efficiently serving many independently-controlled spaces with
dissimilar cooling and heating load requirements.
Variable thermal load profiles in the spaces, the need for multiple,
independently-controlled spaces, and the existence of a common return-air
path are three building characteristics that favor the application of VAV systems.
VAV Systems
period six
Review
Figure 104
Air Conditioning Clinic TRG-TRC014-EN
Air Conditioning Clinic TRG-TRC014-EN© Amer ican Standard Inc. 2001
Review—Period One
EA
OA
RA
central
central
air handler
air handler
thermostat
thermostat
VAV
VAV
box
box
PA
SA
Figure 105
period six
Review