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4 TRG-TRC014-EN
notes
period one
What Is Variable Air Volume?
However, because this type of system can respond to the demands of only one
thermostat, it can serve only those building spaces with similar cooling
requirements. If a building has many spaces with diverse cooling needs, each
must be served by its own system.
Other constant-volume system designs can serve the cooling requirements of
more than one space with a central fan and cooling coil. However, to do so, the
cool primary air must be either reheated or mixed with warm air to produce the
supply temperatures needed to balance the various space cooling loads.
I’m
freezing!
I’m
freezing!
I’m
fine.
I’m
fine.
I’m
hot!
I’m
hot!
It’s stuffy
in here!
It’s stuffy
in here!
Constant Volume–Multiple Spaces
single thermostat
Figure 6
Constant Volume–Multiple Spaces
reheat coilreheat coil
reheat coil
80°F
80°F
[26.7°C]
[26.7°C]
55°F
55°F
[12.8°C]
[12.8°C]
55°F
55°F
[12.8°C]
[12.8°C]
65°F
65°F
[18.3°C]
[18.3°C]
65°F
65°F
[18.3°C]
[18.3°C]
air mixingair mixing
air mixing
Figure 7