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Chapter_6 - Chapter 6 6-78 The source and sink temperatures...

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Chapter 6 6-78 The source and sink temperatures of a power plant are given. The maximum efficiency of the plant is to be determined. Assumptions The plant operates steadily. Analysis The maximum efficiency this plant can have is the Carnot efficiency, which is determined from 0.75 K 1200 K 300 1 1 max th, H L T T 6-84E The claim of an inventor about the operation of a heat engine is to be evaluated. Assumptions The heat engine operates steadily. Analysis If this engine were completely reversible, the thermal efficiency would be 0.45 R 1000 R 550 1 1 max th, H L T T When the first law is applied to the engine above, Btu/h 720 , 27 Btu/h 000 , 15 hp 1 Btu/h 2544.5 ) hp 5 ( net L H Q W Q The actual thermal efficiency of the proposed heat engine is then 459 . 0 hp 1 Btu/h 2544.5 Btu/h 27,720 hp 5 net th H Q W Since the thermal efficiency of the proposed heat engine is greater than that of a completely reversible heat engine which uses the same isothermal energy reservoirs, the inventor's claim is invalid . 6-95E The claim of a thermodynamicist regarding to the thermal efficiency of a heat engine is to be evaluated.
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