The cycle of evaporation and rain in nature can be assumed to be a kind of Carnot cycle. If ocean water instead of evaporation are boiled by the heat of Sun at a constant temperature of 100 deg C and the condensation of steam into water droplets within the clouds occur at constant temperature of -20 deg C. Find the thermal efficiency of Carnot cycle of nature?
A. 0.2777
B. 0.3030
C. 0.3333
D. 0.50
Answer:A
The cycle of evaporation and rain in nature can be assumed to be a kind of Carnot cycle. If ocean water instead of evaporation are boiled by the heat of Sun at a constant temperature of 100 deg C and the condensation of steam into water droplets within the clouds occur at constant temperature of -20 deg C. Find the thermal efficiency of Carnot cycle of nature?
A. 0.2777 B. 0.3030 C. 0.3333 D. 0.50
Explanation: Carnot thermal efficiency= 1-( Mean temperature of heat addition)/( Mean temperature of heat rejection)