A heat engine operates between two reservoirs at 800 and 20oC. Onehalf of the work output of the heat engine is used to drive a Carnot heat pump that removes heat from the cold surrounding at 2oC and transfers it to a house maintained at 22oC. If the house is losing heat at a rate of 62,000 kJ/h, Determine: a) The minimum rate of heat supply (kJ/h) to the heat engine required to keep the house at 22oC. b) The thermal efficiency of the heat engine, if the rate of heat
A heat engine operates between two reservoirs at 800 and 20oC. Onehalf of the work output of the heat engine is used to drive a Carnot heat
pump that removes heat from the cold surrounding at 2oC and transfers
it to a house maintained at 22oC.
If the house is losing heat at a rate of 62,000 kJ/h,
Determine:
a) The minimum rate of heat supply (kJ/h) to the heat engine
required to keep the house at 22oC.
b) The thermal efficiency of the heat engine, if the rate of heat
supply to the heat engine is 15,000 kJ/h.
c) The total amount of entropy change of the surrounding by taking
into account both the heat engine and Carnot heat pump for the cases
of i) and ii), respectively.
d) The cyclic entropy change of the heat engine for the cases of i) and
ii), respectively.
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