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Question: problem 3 a power generation unit with an electric efficiency...

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Problem 3 A power generation unit, with an electric efficiency of 27%, generates 50 kw of electricity. If only 80% of the waste heat is usable heat, determine (1) the overall efficiency, and (2) the overall exergy efficiency of the system. Assume that the source temperature is 473 K and an ambient temperature is 303 K
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