An ideal heat-engine is to be used in an environment where the ambient temperature is 31.5...
An ideal heat-engine is to be used in an environment where the ambient temperature is 31.5 °C. What should be the minimum temperature of the hot heat reservoir in order to reach at least 36.9 percent efficiency with the heat-engine? (Give your answer in Celsius.)
Homework Answers
efficiency n = W/Q = (Qhot - Qcold)/Qhot
Q is proportional to temperatre T
percent efficiency = (Thot - Tcold)/Thot
given n = 36.9% = 0.369
Tcold = 31.5 + 273 = 304.5 K
0.369 = (Thot-304.5)/Thot
Thot = 482.57 K
Thot = 482.57-273 = 209.5 0C
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