A common refrigerator operating on R-22 has a saturation temperature in the evap

Question

A common refrigerator operating on R-22 has a saturation temperature in the evaporator of -19.5 C and a saturation pressure of 14 Bar in the condenser. Find the coefficient of performance for the refrigerator for the following assumptions. (a) Determine the work input per kg of R-22 into the compressor assuming an isentropic efficiency of 76 percent. (b) Determine the heat rejection rate per kg of R-22 in the condenser. (c) Determine the heat addition rate per kg of R-22 in the evaporator. (d) Draw a cycle process diagram. (e) Determine the coefficient of performance.

Explanation / Answer

h4 = h3 = 89.68 kJ/kg

a)

For isentropic compression, taking properties at 14 bar and s = s1 = 0.9586 kJ/kg-K we get h2s = 286 kJ/kg

Isentropic eff = (h2s

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