5.12.1 Recirculating air damper
Recirculating dampers (mixing air dampers) reuse energy from room air as much
as possible. Extract air is mixed with outside air where additional heating/cooling
devices are in the room and extract air is efficient enough. This controls the supply
air temperature and saves energy. It assumes control over the heating/cooling
sequence prior to the heat exchange device.
●
For TEx > TOa + 2k, room air can be considered for heating. The recirculating
damper is controlled to fully open if the plant is also in heating mode. The
function is disabled for TEx < TOa.
●
For TEx < TOa - 2k, room air can be considered for cooling. The recirculating
damper is controlled to fully open if the plant is also in cooling mode. The
function is disabled for TEx < TOa.
●
TSuAfPreHcl is used instead of Toa when the preheating coil is active.
●
The dehumidify / CO
2
/ fine dust function fully opens the outside air damper to
improve ventilation (i.e. air quality) when heating/cooling conditions are not met
for the recirculating damper.
●
The free-cooling function fully closes the recirculating damper and fully opens
the outside air damper.
The function requires at least one 0-10 V output for the recirculating damper
command.
The outside air damper command can be selected but is not required when there is
a mechanical rod connected to the recirculating damper.
The recirculating air damper operates in the opposite direction as the outside air
damper.
Diagram of a recirculating air damper (red box) as part of an air handling unit.
Application functionalities
Outside air dampers (DmpShoffOa11y)
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