A) What is the efficiency of the compressor? B) If the refrigerator is required to produce 300 kJ/min of cooling, what is the required flow rate of refrigerant in mol/min? C) What is the coefficient of performance of the refrigeration cycle?
A refrigerator operates using the vapor-compression cycle. The steady-state refrigeration cycle and the physical properties of the refrigerant are summarized here:
? A boiler produces saturated vapor at P=0.03 MPa and T=5 °C, which has a specific enthalpy of 30 kJ/mol.
? The vapor is compressed to P=0.09 MPa. The ACTUAL temperature of the gas leaving the compressor is T=35 °C.
? The vapor is then condensed into saturated liquid at P=0.09 MPa, which has a specific enthalpy of 15 kJ/mol.
? The liquid enters a valve and experiences a pressure drop to P=0.03 MPa.
? The refrigerant then enters the boiler.
The ideal gas heat capacity can be considered constant at CP*=15R.
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