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21 October, 14:55

A diesel engine performs 2100 J of mechanical work and discards 4500 J of heat each cycle. Part A)

How much heat must be supplied to the engine in each cycle?

Part B)

What is the thermal efficiency of the engine?

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Answers (1)
  1. 21 October, 15:55
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    (a) 6600 J

    (b) 31.8%

    Explanation:

    work performed, W = 2100 J

    Heat discard, Q2 = 4500 J

    (a) Let Q1 be the amount of heat supplied

    Work = Q1 - Q2

    Q1 = Q2 + W = 4500 + 2100 = 6600 J

    (b) efficiency = 1 - Q2 / Q1

    Efficiency = 1 - (4500 / 6600) = 0.318 = 31.8 %
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