Question

A heat engine cycle is executed with steam in the saturation dome. The pressure of steam is 1.1 MPa during heat addition and 0.3 MPa during heat rejection. The highest possible efficiency of this heat engine is:

Answer 1

Answer:The highest possible efficiency of this heat engine is 11%

Explanation:

Saturated water temperature at  P1, Pressure in Heat addition,

1.1 MPa=185°C +273= 458K

Saturated water temperature at  P2, Pressure in Heat rejection,

0.3MPa=133.5°C+ 273=406.5K

The highest possible efficiency of any heat engine is the Carnot efficiency given as

Carnot efficiency,  ηmax = 1- (T2/ T1)

1- (406.5K/458K)

1-0.88755=0.112

=11%