Trane TRG-TRC003-EN notes

TRG-TRC003-EN 31

period four

Pressure–Enthalpy Chart

notes temperature is 121.5°F [49.7°C]. The refrigerant vapor leaving the compressor

is therefore 70°F [38.9°C] above its saturation temperature.

This hot, high-pressure refrigerant vapor then travels to the condenser.

Inside of the condenser, heat is transferred from the hot, high-pressure

refrigerant vapor (') to relatively cool ambient air. This reduction in the

enthalpy of the refrigerant vapor causes it to desuperheat. It becomes saturated

vapor, condenses into saturated liquid, and further subcools before leaving the

condenser (*) to go to the expansion device.

First, the refrigerant vapor is cooled (the line from ' to () to its saturation

temperature of 121.5°F [49.7°C]. Next, as additional heat is removed by the

condenser, the refrigerant vapor condenses to its saturated liquid condition (the

line from ( to )). This saturated liquid refrigerant now passes through the area

of the condenser called the subcooler. Here, the liquid refrigerant is further

cooled (the line from ) to *), in this example, to 110°F [43.3°C]. Because the

saturation temperature at the condensing pressure is 121.5°F [49.7°C], the

refrigerant has been subcooled 11.5°F [6.4°C].

With the temperature of the refrigerant in the condenser this high, air at normal

ambient conditions can be used to absorb the heat from the refrigerant. From

the condenser, the high-pressure, subcooled liquid refrigerant (*) travels to the

expansion device.

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Figure 48