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22 TRG-TRC014-EN
notes
period two
Components of a VAV System
A dual-duct terminal unit consists of two airflow modulation devices with
controls packaged in a sheet-metal enclosure. One controls the cool primary air
and the other controls the warm primary air. Depending on the method of
control, these two air streams may mix in the dual-duct unit before proceeding
downstream to the space.
This VAV terminal unit is intended for zones that require seasonal cooling and
heating, typically the exterior zones of a building. It is seldom used because of
the high first cost incurred to provide two duct systems.
A dual-duct terminal unit can be controlled to provide either a variable volume
or a constant volume of supply air to the space.
Dual-Duct
supply
supply
air
air
cool
cool
primary air
primary air
warm
warm
primary air
primary air
Figure 34