Improving the Vapor-Compression Refrigeration Cycle
In the previous lesson, we discussed the importance of selecting the appropriate refrigerant. We stressed the importance of the P*-T relationship. This relationship determines the operating pressures of the condenser and the evaporator.
Recall from Lesson 10B:
The
vapor pressure
of therefrigerant
at the temperature of the condenser should not be too high, P*(Tcond) < 2 MPa, to keep equipment costs low.The
vapor pressure
of therefrigerant
at the temperature of the evaporator should be greater than 1 atm, P*(Tevap) > 1atm, to prevent air leakage into the system.The combination of these two constraints puts a firm limit on the range of temperatures between which a simple
vapor-compression refrigerator
can operate.How can we make the cold space even colder (reduce TC) and reject heat at an even higher temperature (increase TH) without dramatically increasing the cost to build the refrigeration system ?
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