An ideal vapor-compression refrigeration cycle uses R-134a
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An ideal vapor-compression refrigeration cycle uses R-134a as the working fluid in an air-conditioning system. The refrigerant enters the compressor as a saturated vapor at 40 °F and leaves the condenser as a saturated liquid at 130 °F. The mass flow rate of the refrigerant is 1.5 lbm/s. Calculate the following:
a. The heat transfer rate in the condenser
b. The heat transfer rate in the evaporator
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The solution provides diagram, explanations, calculations and discussion for the refrigeration problem.
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First look up the thermodynamic data in the reference:
Saturated vapor at 40oF, hg = 107.39 (Btu/lbm), sg = 0.2189 (Btu/lbmR)
Saturated liquid at 130°F, hf = 55.3 (Btu/lbm), P = 215 psia.
For an ideal cycle, across the expansion valve, there's no change in enthalpy, so ...
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