An inventor has developed a system that undergoes a cycle wh

An inventor has developed a system that undergoes a cycle while receiving energy from a reservoir at 1027 degree C and discharges energy to another reservoir at 427 degree C. A thermal efficiency of 65% is claimed for the cycle. Evaluate this claim. eta_max = 1 - T_L/T_H

Solution

Solution :

We knows that

max efficiency= 1- (Temperature of sink/temperature of reservoir)

Maximum efficiency = 1- {(427+273)/(1027+273)}

Maximum efficiency = 1- (700/1300) = 46.15 %

But the claimed effciency is 65% which is higher than the maximum efficiency hence the claim is wrong.