period two

Condensers

notes

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.

Effect of Subcooling

subcooling

 

 

D

{

C

 

 

DI

pressure

 

 

AI

 

 

A

 

B

refrigeration

effect

enthalpy

Figure 10

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.

6

TRG-TRC005-EN

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Trane trg-trc005-en manual Effect of Subcooling
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trg-trc005-en specifications

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