Determine the K.P.D. an ideal heat engine, if the heater temperature is 600 K, the refrigerator temperature is 300 K.

K.P.D. η of an ideal heat engine can be found by the formula

η = (T1 – T2) / T1 = 1 – T2 / T1,

where T1 is the heater temperature, T2 is the refrigerator temperature.

For a given ideal heat engine K.P.D. is equal to

η = 1 – 300/600;

η = 1 – 1/2;

η = 1/2 = 0.5,


η = 50%.

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