Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP) of 4.0 when operated as a

Question

Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP) of 4.0 when operated as a refrigerator and a COP of 5.0 when operated as a heat pump. What is its thermal efficiency when operated as a heat engine doing work

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Ladonna 1 year 2021-07-31T12:56:44+00:00 1 Answers 36 views 0

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    2021-07-31T12:58:26+00:00

    Answer:

    η = 0.2 = 20%

    Explanation:

    The relationship between the thermal efficiency of a heat engine and the Coefficient of Performance (COP) of the corresponding Heat Pump is given as follows:

    [tex]\eta = \frac{1}{COP_{HP}}[/tex]

    where,

    η = thermal efficiency = ?

    [tex]COP_{HP}[/tex] = Coefficient of Performance of Heat Pump = 5

    Therefore,

    [tex]\eta = \frac{1}{5} \\\\[/tex]

    η = 0.2 = 20%

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