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Problem 5.6 A heat pump is used to maintain a house at a constant temperature of 23°C. The house is losing heat to the outside air through the walls and the windows at a rate of 60,000 kJ/h while the energy generated within the house from people, lights and appliances amounts to 4000 kJ/h. For a COP of 2.5, determine the required power input to the heat pump. (Answer: 6.22 kW) bly. Problem 5.7 A heat pump is to be used for heating a house in winter. The house is to be always maintained at 26°C. When the temperature outdoors drops to -4°C, the heat losses from the house are estimated to be 55,000 kJ/h. Determine the minimum power required to run this heat pump if heat is extracted from (a) the outdoor air at -4°C and (b) the well water at 10°C (Answer: 1.53 kW, 0.82 kW)

Problem 5.6 A heat pump is used to maintain a house at a constant temperature of 23°C. The house is losing heat to the outside air through the walls and the windows at a rate of 60,000 kJ/h while the energy generated within the house from people, lights and appliances amounts to 4000 kJ/h. For a COP of 2.5, determine the required power input to the heat pump. (Answer: 6.22 kW) bly. Problem 5.7 A heat pump is to be used for heating a house in winter. The house is to be always maintained at 26°C. When the temperature outdoors drops to -4°C, the heat losses from the house are estimated to be 55,000 kJ/h. Determine the minimum power required to run this heat pump if heat is extracted from (a) the outdoor air at -4°C and (b) the well water at 10°C (Answer: 1.53 kW, 0.82 kW)

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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5.6 and 5.7

DIY Problem 5.6 A heat pump is used to maintain a house at a constant temperature of 23°C. The house is losing heat to the outside air through the walls and the windows at a rate of 60,000 kJ/h while the energy generated within the house from people, lights and appliances amounts to 4000 kJ/h. For a COP of 2.5, determine the required power input to the heat pump. (Answer: 6.22 kW) bly Problem 5.7 A heat pump is to be used for heating a house in winter. The house is to be always maintained at 26°C. When the temperature outdoors drops to -4°C, the heat losses from the house are estimated to be 55,000 kJ/h. Determine the minimum power required to run this heat pump if heat is extracted from (a) the outdoor air at -4°C and (b) the well water at 10°C Problem 5.8 A refrigerator is to remove heat from the cooled space at a rate of 300 kJ/min to maintain its temperature at -8°C. If the air surrounding the refrigerator is at 25°C, determine the minimum power input required for this refrigerator. 25°C -ft wnet in ac = 300kJ/min - 8C COPE, rev Ju TM-T₂ 2.65 298-265 8.03 COPR = PL сорк COPR = COPR (Answer: 1.53 kW, 0.82 kW) weet, in SKTV Wnet in QL QH-QL (Answer: 0.623 kW) 137
Transcribed Image Text:DIY Problem 5.6 A heat pump is used to maintain a house at a constant temperature of 23°C. The house is losing heat to the outside air through the walls and the windows at a rate of 60,000 kJ/h while the energy generated within the house from people, lights and appliances amounts to 4000 kJ/h. For a COP of 2.5, determine the required power input to the heat pump. (Answer: 6.22 kW) bly Problem 5.7 A heat pump is to be used for heating a house in winter. The house is to be always maintained at 26°C. When the temperature outdoors drops to -4°C, the heat losses from the house are estimated to be 55,000 kJ/h. Determine the minimum power required to run this heat pump if heat is extracted from (a) the outdoor air at -4°C and (b) the well water at 10°C Problem 5.8 A refrigerator is to remove heat from the cooled space at a rate of 300 kJ/min to maintain its temperature at -8°C. If the air surrounding the refrigerator is at 25°C, determine the minimum power input required for this refrigerator. 25°C -ft wnet in ac = 300kJ/min - 8C COPE, rev Ju TM-T₂ 2.65 298-265 8.03 COPR = PL сорк COPR = COPR (Answer: 1.53 kW, 0.82 kW) weet, in SKTV Wnet in QL QH-QL (Answer: 0.623 kW) 137
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