# Ch5solutions - S-lC Water is not a fuel thus the claim is...

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S-lC Water is not a fuel; thus the claim is f.:llse. 5-14C (a) No, (b) "'1tes. Accordin~to the second law, no heat engine can have and efficiency of 100%. 5-18 The rates of heat supply and Jheat rejection of a power plant are given. The power output and the thermal efficiency of this power pia t are to be determined. Assumptions 1 The plant op~rates steadily. 2 Heat losses from the working fluid at the pipes and other components are taken into consideration. Analysis (a) The total heat rejected ~y this power plant is Qt. = 145 + 8 = 153GJ/h ! Then the net power output of the plabt becomes 280 GJ/h . .. Wnel.oul =QH -QL =280-153=127GJ/h=3S.3MW (b) The thermal efficiency of the plant is determined from its definition. w = nel.OU'- 127GJ/h QH - 280GJ/h =1°,454 = 45.4% 'lth S-19E The power output and thermal efficiency of a car engine are given. The rate of fuel consumption is to be determined. Assumptions The car operates steadily.

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Ch5solutions - S-lC Water is not a fuel thus the claim is...

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