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6 TRG-TRC005-EN
notes
period two
Condensers
The air-cooled condenser is very popular in both residential and commercial
applications because of its convenience. It requires very little maintenance and
does not require the freeze protection and water treatment that is necessary
with a water-cooled condenser. Additionally, it is favored in areas that have an
inadequate or costly water supply, or where the use of water for air
conditioning is restricted.
The benefit of subcooling on system performance can be demonstrated by
comparing the performance of a system with and without subcooling.
The change in enthalpy (the line from A to B) that occurs in the evaporator is
called the refrigeration effect. This is the amount of heat that each pound
[kg] of liquid refrigerant will absorb when it evaporates.
In comparison, the same system without subcooling produces less refrigeration
effect (the line from A’ to B). The system without subcooling must evaporate
substantially more refrigerant within a larger coil to produce the same capacity
as the system with subcooling.
Instead of subcooling in the condenser, some packaged refrigeration
equipment, such as water chillers, may use an economizer or liquid/vapor
separator to increase this refrigeration effect.
A
D
pressure
pressure
enthalpy
enthalpy
B
C
Effect of Subcooling
A
I
{
subcooling
subcooling
refrigeration
refrigeration
effect
effect
D
I
Figure 10