A Carnot engine whose low temperature reservoir is at 7degC has an efficiency of 50%. It is desired to increase the efficiency to 70%. By how many degrees should the temperature of the high temperature reservoir be increased?

VA Valeriiariabina asked on 17 July 2020, 09:53
1 answers / 860 views / 7 votes
FA

This problem is fairly easy, if you are unable to solve this I recommend you to study the theory of carnot engines again.

If you got the theory and the formula right, you might be doing the mistake of not converting Celsius to Kelvin.

First case
η = 0.5
T_low = 273 + 7 = 280
Find T _high

Second case
η = 0.7
T_low = 273 + 7 = 280
Find T _high

Subtract T_high values of 2 cases and you will have your answer.

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