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VAV-SVX08R-EN
Figure 8. Chilled water sensible cooling unit with hot
water coil
Figure 9. Chilled water sensible cooling unit with
electric heat
The function of the Trane chilled water sensible cooling
terminal units is a little different than traditional VAV
Terminal Units. These terminal units are part of a
ssyysstteemm that uses a dedicated outdoor-air unit to
distribute outdoor air to an air valve on each terminal
unit to meet the ventilation requirements of the zone.
Each terminal unit is also equipped with a cooling coil
mounted on the plenum inlet. Recirculated air from the
plenum (or directly from the occupied space) is drawn
in through this cooling coil by the local fan. This cooled
air is then mixed with the conditioned (cooled,
dehumidified, heated, or humidified) outdoor air from
the dedicated OA unit, and distributed through the
downstream ductwork to the zone.
In most applications, the water supplied to this local
cooling coil is controlled to a temperature above the
dew point in the zone. This avoids moisture in the air
from condensing on the coil, so it operates dry and
provides only sensible cooling. All the
dehumidification must then be provided by the
dedicated outdoor-air unit. Trane chilled water sensible
cooling terminal units are built with a drip pan located
beneath the cooling coil, with a moisture sensor
installed in it, to detect and prevent any moisture from
getting on the ceiling beneath the units or into the
occupied space below. These terminal units can be
configured with either a hot water coil or electric heater
mounted at the unit discharge.
UUnniitt IInnffoorrmmaattiioonn
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