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10 TRG-TRC005-EN
notes
period two
Condensers
Condenser Control
The heat rejection capacity of a condenser is influenced by (1) the temperature
difference between the refrigerant and the cooling media (air, water, or other
fluid), (2) the flow rate of the cooling media through the condenser, and (3) the
flow rate of the refrigerant through the condenser.
To balance the rate of heat rejection (in the condenser) with the changing
system load, at least one of these variables may be controlled.
As the system load decreases, the heat rejection capacity of the condenser is
greater than the load. Because of this excess capacity, the condenser matches
the decreasing load by operating at progressively lower pressures. Additionally,
a reduction in outdoor air temperature allows the temperature of the air or
water flowing through the condenser to drop. This also has the effect of
lowering the condensing pressure.
Condenser Control
I Condenser capacity is influenced by:
K Temperature difference between refrigerant and
cooling media
K Flow rate of cooling media through condenser
K Flow rate of refrigerant through condenser
Figure 15
pressure
pressure
enthalpy
enthalpy
full load
full load
condenser heat
condenser heat
rejection capacity
rejection capacity
part load
part load
full load
full load
Condenser Capacity
part load
part load
condenser heat
condenser heat
rejection capacity
rejection capacity
Figure 16