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Dual Duct VAV - Description

Dual duct terminals units have two air valves in a common VAV box enclosure: one controls cool primary air and the other controls warm air. This system provides variable air volume as well as variable temperature. With the dual duct system, adjustable air mixing point is provided to minimize air movement when the unit changes over between cooling and heating, and vice versa. Terminals are connected to temperature sensors located in the zone.

Dual duct systems can be very energy efficient when there is little call to mix cool and heated air, and separate supply fans are utilized for heating and cooling. A major shortcoming of single-zone systems is that the heating and cooling capacity supplied to each comfort zone cannot be adjusted to match changing load conditions within the zone. As a result, although the central thermostat can be satisfied, individual zone comfort is often compromised.




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