A house is equipped with an air conditioner that uses refrigerant-134a as the working fluid, as shown in Figure 1. The air conditioner is used to keep the house at 25°C by rejecting heat the waste heat to outdoor at 37°C. The house gains heat through the walls and the windows at a rate of 300 kJ/min while the heat generated with the computer, TV and lights amounts to 900 W. The refrigerant enters the compressor at 500 kPa as a saturated vapour with a rate of 150 L/min and leaves at 1200 kPa and 50°C. Determine: i. actual COP, il. the maximum COP, and iii. the minimum volume flow rate (in L/min) of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions. QH Expansion valve Condenser Evaporator •Q₁ 1.2 MPa 50°C Win Compressor 500 KPa Saturated vapor 500 KPa

A house is equipped with an air conditioner that uses refrigerant-134a as the working fluid, as shown in Figure 1. The air conditioner is used to keep the house at 25°C by rejecting heat the waste heat to outdoor at 37°C. The house gains heat through the walls and the windows at a rate of 300 kJ/min while the heat generated with the computer, TV and lights amounts to 900 W. The refrigerant enters the compressor at 500 kPa as a saturated vapour with a rate of 150 L/min and leaves at 1200 kPa and 50°C. Determine: i. actual COP, il. the maximum COP, and iii. the minimum volume flow rate (in L/min) of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions. QH Expansion valve Condenser Evaporator •Q₁ 1.2 MPa 50°C Win Compressor 500 KPa Saturated vapor 500 KPa

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

Chapter44: Geothermal Heat Pumps

Section: Chapter Questions

Problem 2RQ: An important factor (or factors) involving water quality with regard to open-loop heat pump systems...

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Yeji just came back from dance practice and went straight to her bedroom. It was summer so the temperature in her bedroom was estimated to be around 40°C. She then turned her air conditioner on, closed her door and windows, and it cooled her bedroom to 18°C in 20 minutes. Calculate,a. How much heat was transferred to cool her bedroom to 18°C?b. What is the power consumption of the air conditioner, in kW?The air conditioner has a COP of 2.8. Assume the mass of her entire bedroom to be 750 kg of air, Cv = 0.72 kJ/kg.°C and Cp = 1.0 kJ/kg.°C.*Round off all answers to four decimal places*