Trane TRG-TRC014-EN manual Independent Space Control, Common Return Air Path, period one

period one

What Is Variable Air Volume?

notes

Independent Space Control

▲Dedicated terminal units

▲Dedicated thermostats

Figure 17

Another feature of the VAV system is the ability to efficiently satisfy the comfort requirements of many different spaces within the building. As we saw from the comparison of the VAV and terminal reheat systems, the VAV system is the most efficient at performing this task.

Common Return Air Path

Space 1 Space 2 Space 3

Figure 18

Because the VAV system uses one central cooling coil and fan to serve many spaces, the need for a common path to allow the air to return from these spaces is significant. A return air plenum is commonly used. If return ductwork is required to connect each conditioned space to the central air handling unit, the system becomes more difficult to balance and control.

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