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TRG-TRC005-EN 7
period two
Condensers
notes
An alternative air-cooled condenser uses a centrifugal fan to draw or blow air
over the condensing coil. The principal advantage of this design is that the
centrifugal fan is capable of overcoming the higher static-pressure losses
associated with ductwork. Therefore, if the condenser is to be located indoors
and uses a duct system to deliver air to and from the condenser coil, the
centrifugal fan air-cooled condenser is probably best suited for this
application.
Evaporative Condensers
A modification of the air-cooled condenser is the evaporative condenser.
Within this device, the refrigerant flows through tubes and air is drawn or
blown over the tubes by a fan. The difference is that water is sprayed on the
tube surfaces. As the air passes over the coil, it causes a small portion of the
water to evaporate. This evaporation process absorbs heat from the coil,
Centrifugal Fan Air-Cooled Condenser
centrifugal
centrifugal
fan
fan
condenser
condenser
coil
coil
Figure 11
Evaporative Condenser
sump
sump
pump
pump
condenser
condenser
coil
coil
refrigerant
refrigerant
vapor
vapor
subcooler
subcooler
fan
fan
liquid refrigerant
liquid refrigerant
Figure 12