A heat pump using refrigerant-134a heals he heat source. The house is losing heat at a rate of 60000 kJ/h.-The refrigerant enters the compressor at 280 kPa and 0 C°, and it leaves at 1 Mpa and 60 C. The refrigerant exits the condenser at 30 C. Determine: a- The power input to the heat pump. b- The rate of heat absorption from the water. c- The increase in electric power input if an electric resistance heater is used instead of a heat pämn.

A heat pump using refrigerant-134a heals he heat source. The house is losing heat at a rate of 60000 kJ/h.-The refrigerant enters the compressor at 280 kPa and 0 C°, and it leaves at 1 Mpa and 60 C. The refrigerant exits the condenser at 30 C. Determine: a- The power input to the heat pump. b- The rate of heat absorption from the water. c- The increase in electric power input if an electric resistance heater is used instead of a heat pämn.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 MPa and -10oC at rate of 0.05 kg/sec and leave at 0.8 MPa and 50oC. The refrigerant is cooled in the condenser to 26oC and 0.72MPa and is throttled to 0.15MPa. Determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the isentropic efficiency of the compressor and (c) the coefficient of performance.
i. leaves at 5°C. LMTD and AMTD in the evaporator
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.28 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of 420 W from the surroundings. The heat exchanger loses no heat to the environment. 26°C 42°C Condenser Expansion valve Evaporator OL Water 18°C 1.2 MPa 65°C Oin W in Compressor 60 kPa -34°C Determine the COP of the refrigerator. (You must provide an answer before moving on to the next part.) The COP of the refrigerator is 1.824 >
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