Question

Efficiency of a Carnot cycle is 75%. If temperature of the hot reservoir is 727ºC, calculate the temperature of the cold reservoir.

Answer 1

Data : η = 75% = 0.75, T = (273 + 727) K = 1000 K

∴ T_C = T_C (1 – η) = 1000 K (1 – 0.75) 

= 250K = (250 – 273)°C

= -23 °C

This is the temperature of the cold reservoir.