A solar energy based heat engine which receives 80 kJ of

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A solar energy based heat engine which receives 80 kJ of heat at 100°C and rejects 70 kJ of heat to the ambient at 30°C is to be designed. The thermal efficiency of the heat engine is

1. 70%
2. 18.8%
3. 12.5%
4. Indetermine

Correct Option: C

η_th =	( 80 - 70 )	× 100 =	1	× 100 = 12.5%
	80		8