Task 4A heat pump using refrigerant-134a heats a house by using underground water at 8°C as the heatsource. The house is losing heat at a rate of 60,000 kJ/h. The refrigerant enters the compressor at280 kPa and 0°C, and it leaves at 1 MPa and 60°C. The refrigerant exits the condenser at 30°C.Determine(4) Calculate the COP of this heat pump(5) The increase in electric power input if an electric resistance heater is used instead of a heatpump(6) Investigate the effect of varying the compressor isentropic efficiency over the range [60 to100 percent]. Plot the power input to the compressor and the electric power saved by usinga heat pump rather than electric resistance heating as functions of compressor efficiencyand discuss the results.(7) In order to increase the COP of the heat pump, what recommendations or improvementswould you suggest? explain your recommendations.

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A heat pump using refrigerant-134a heats a house by using underground water at 8°C as the heat ource. The house is losing heat at a rate of 60,000 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 (4) Calculate the COP of this heat pump (5) The increase in electric power input if an electric resistance heater is used instead of a heat pump

A heat pump using refrigerant-134a heats a house by using underground water at 8°C as the heat ource. The house is losing heat at a rate of 60,000 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 (4) Calculate the COP of this heat pump (5) The increase in electric power input if an electric resistance heater is used instead of a heat pump

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

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