C-D, Isobaric Heat removal in condenser

D-A, Constant enthalpy expansion in expansion valve

Heat energy equivalent of work done = Heat energy rejected- heat energy received

= Area ABCDA + Area under AD

Coefficient of performance = heat energy received/ Heat energy equivalent of work done

The coefficient of performance for freon is about 4.7

It should be noted that undercooling increases the heat received by moving point A to the left increasing the refrigerant effect.

The critical point is the poiunt above which

• The gas will not liquify by the action of pressure alone. This is an important temperature for refrigeration systesm which rely on the change of state for heat transfer.
• The gas will not liquify by cooling alone

p-h diagram (Mollier)

Typical system

The system shown above and described below is typical of that fitted on may ships other than it is more common to have two low temperature rooms rather than one.

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