To design a 25 efficient ideal engine with a cold sink TL 3

To design a 25% efficient ideal engine with a cold sink, TL = 300degree C, the hot source should be at temperature ___________ degree C .

Solution

Efficiency = 1-(T_c/T_H)

Here,

efficiency =25%

T_c = 300degC

T_H = ?

25% = 1- (T_C/T_H)

T_c/T_H = 1 - 0.25

T_H = T_C/0.75

= 300/0.75

= 400 Degree C