Question

A Carnot engine has an efficiency of 50% when it sinks temperature is at 27 degree celcius calculate the change in source temperature for increasing its efficiency to 60%

Answer 1

$\eta=1-\frac{T_2}{T_1},$

$0.5=1-\frac{300}{T_1},$

$T_1=600~K,$

$0.6=1-\frac{300}{T_3},$

$T_3=750~K,$

$∆T=T_3-T_1=150~K.$