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Problem 3 (33 pts) Refrigerant R-134a enters a compressor of a residential heat pump at 200 kPa and superheated by 10.09 C. The pressure and temperature entering the condenser is 900 kPa and 60 C, respectively. The pressure drops 100 kPa across the condenser. The refrigerant enters the expansion valve as saturated liquid. The pressure drop across the evaporator is 40 kPa. The pump is adiabatic. The ambient temperature is 300 K, and the temperature of the cold space is 0 C. Calculate the exergy destroyed per unit mass $x_{dest}$ across the evaporator. Neglect changes in kinetic and potential energy.

          Problem 3 (33 pts)
Refrigerant R-134a enters a compressor of a residential heat pump at 200 kPa and superheated by 10.09 C. The
pressure and temperature entering the condenser is 900 kPa and 60 C, respectively. The pressure drops 100 kPa
across the condenser. The refrigerant enters the expansion valve as saturated liquid. The pressure drop across
the evaporator is 40 kPa. The pump is adiabatic. The ambient temperature is 300 K, and the temperature of
the cold space is 0 C. Calculate the exergy destroyed per unit mass $x_{dest}$ across the evaporator. Neglect changes
in kinetic and potential energy.

Problem 3 (33 pts)
Refrigerant R-134a enters a compressor of a residential heat pump at 200 kPa and superheated by 10.09 C. The
pressure and temperature entering the condenser is 900 kPa and 60 C, respectively. The pressure drops 100 kPa
across the condenser. The refrigerant enters the expansion valve as saturated liquid. The pressure drop across
the evaporator is 40 kPa. The pump is adiabatic. The ambient temperature is 300 K, and the temperature of
the cold space is 0 C. Calculate the exergy destroyed per unit mass xdest across the evaporator. Neglect changes
in kinetic and potential energy.

Added by Christopher S.

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