Engineering, 06.03.2020 22:22, lindalu
A Carnot heat engine receives heat from a reservoir at 900∘C at a rate of 800 kJ/min and rejects the waste heat to the ambient air at 27∘C. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at -5∘C and transfers it to the same ambient air at 27∘C. Determine (a) the maximum rate of heat removal from the refrigerated space and (b) the total rate of heat rejection to the ambient air.
Answers: 2
(1)
- Temperature of the refrigerated space, in Kelvin.
- Temperature of the ambient air, in Kelvin.
), in kilojoules per minute, is:
(2)
- Thermal efficiency, no unit.
- Heat needed to drive the refrigerator, in kilojoules per minute.
), no unit, is:
(3)
), in kilojoules per minute, from the refrigerated space is:
(4)
), in kilojoules per minute, and heat transferred from refrigerator (
), in kilojoules per minute. That is to say:
(5)
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A Carnot heat engine receives heat from a reservoir at 900∘C at a rate of 800 kJ/min and rejects the...
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