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Problem 7 A Carnot heat engine receives heat from a reservoir at 1600°F at a rate of 710 Btu/min and rejects the waste heat to the ambient air at 75°F. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at 15°F and transfers it to the same ambient air at 75°F. Determine (a) the maximum rate of heat removal from the refrigerated space, and (b) the total rate of heat rejection to the ambient air. Problem 8 A heat engine operates between two reservoirs at 825 and 25°C. One-half of the work output of the heat engine is used to drive a Carnot heat pump that removes heat from the cold surroundings at 1°C and transfers it to a house maintained at 22°C. If the house is losing heat at a rate of 60,000 kJ/h, determine the minimum rate of heat supply to the heat engine required to keep the house at 22°C.

Problem 7 A Carnot heat engine receives heat from a reservoir at 1600°F at a rate of 710 Btu/min and rejects the waste heat to the ambient air at 75°F. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at 15°F and transfers it to the same ambient air at 75°F. Determine (a) the maximum rate of heat removal from the refrigerated space, and (b) the total rate of heat rejection to the ambient air. Problem 8 A heat engine operates between two reservoirs at 825 and 25°C. One-half of the work output of the heat engine is used to drive a Carnot heat pump that removes heat from the cold surroundings at 1°C and transfers it to a house maintained at 22°C. If the house is losing heat at a rate of 60,000 kJ/h, determine the minimum rate of heat supply to the heat engine required to keep the house at 22°C.

Sustainable Energy
Sustainable Energy
2nd Edition
ISBN:9781337551663
Author:DUNLAP, Richard A.
Publisher:DUNLAP, Richard A.
Chapter14: Ocean Thermal Energy Conversion And Ocean Salinity Gradient Energy
Section: Chapter Questions
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Problem 7 A Carnot heat engine receives heat from a reservoir at 1600°F at a rate of 710 Btu/min and rejects the waste heat to the ambient air at 75°F. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at 15°F and transfers it to the same ambient air at 75°F. Determine (a) the maximum rate of heat removal from the refrigerated space, and (b) the total rate of heat rejection to the ambient air. Problem 8 A heat engine operates between two reservoirs at 825 and 25°C. One-half of the work output of the heat engine is used to drive a Carnot heat pump that removes heat from the cold surroundings at 1°C and transfers it to a house maintained at 22°C. If the house is losing heat at a rate of 60,000 kJ/h, determine the minimum rate of heat supply to the heat engine required to keep the house at 22°C.
Transcribed Image Text:Problem 7 A Carnot heat engine receives heat from a reservoir at 1600°F at a rate of 710 Btu/min and rejects the waste heat to the ambient air at 75°F. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at 15°F and transfers it to the same ambient air at 75°F. Determine (a) the maximum rate of heat removal from the refrigerated space, and (b) the total rate of heat rejection to the ambient air. Problem 8 A heat engine operates between two reservoirs at 825 and 25°C. One-half of the work output of the heat engine is used to drive a Carnot heat pump that removes heat from the cold surroundings at 1°C and transfers it to a house maintained at 22°C. If the house is losing heat at a rate of 60,000 kJ/h, determine the minimum rate of heat supply to the heat engine required to keep the house at 22°C.
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