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8 TRG-TRC014-EN
notes
period one
What Is Variable Air Volume?
the air volume reduction creates an opportunity to reduce the fan energy
required to move this air. The amount of energy saved depends on the method
used to modulate the capacity of the fan (to be discussed in Period Four).
Second, the reduced airflow across the cooling coil causes the refrigeration
system to throttle back in order to stabilize the primary air temperature. In turn,
this results in a reduction in refrigeration energy compared to full load.
Another reason for VAV is to cost-effectively provide improved comfort. A VAV
system is capable of controlling space temperature in many spaces with
dissimilar cooling and heating requirements, while using only one central air
handling unit (AHU). This is accomplished by providing one VAV terminal unit
and thermostat for each independently controlled space. When the sun is
beating against the west side of the building in the late afternoon, a VAV system
can provide an increased amount of cool supply air to keep the spaces on the
west exposure comfortable, while throttling back the airflow to the spaces on
the east exposure so as not to overcool them.
Why VAV? Comfort
Ahhh!
Ahhh!
I’m
fine.
I’m
fine.
I’m
quite
cozy.
I’m
quite
cozy.
It’s nice
in here!
It’s nice
in here!
▲ Dedicated terminal units
▲ Dedicated thermostats
Figure 13