A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 650

thermal-efficiency
heat-reservoirs

#1

A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 650
K and 270 K, performs 4.3 kJ of net work and rejects 8.0 kJ of heat in a single cycle. The
thermal efficiency of this heat engine is

Answer:

For a carnot cycle, n= 1-(T1/T2) = 1- 270/650 = 0.584
For a real Cycle,n’ = 4.3/(4.3+8) = 0.35
So, thermal efficiency, N = n’/n = 0.35/0.584 = 0.6