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Test 3 solutions

# Test 3 solutions - Solution of Test 3 Section 1 1 An...

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Solution of Test 3 – Section 1 1. An inventor claims to have developed a heat engine. The inventor reports temperature, heat transfer, and work output measurements. The claim is to be evaluated. Analysis The highest thermal efficiency a heat engine operating between two specified temperature limits can have is the Carnot efficiency, which is determined from L H T 1 1 0.40 T th,max th,C 300 K or 500 K η= η = = = 40% The actual thermal efficiency of the heat engine in question is 42.9% or 0.429 kJ 700 kJ 300 net th = = = H Q W η which is greater than the maximum possible thermal efficiency. Therefore, this heat engine is a PMM2 and the claim is false . 2. Solution Air is compressed in a car engine isentropically. For a given compression ratio, the final air temperature is to be determined. Assumptions At specified conditions, air can be treated as an ideal gas. Therefore, the isentropic relations for ideal gases are applicable.

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Test 3 solutions - Solution of Test 3 Section 1 1 An...

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