A heat exchanger increases the availability of 3 kg/s water by 1650 kJ/kg by using 10 kg/s air which comes in at 1400 K and leaves with 600 kJ/kg less availability. What is the second law efficiency?

A heat exchanger increases the availability of 3 kg/s water by 1650 kJ

1.	A heat exchanger increases the availability of 3 kg/s water by 1650 kJ/kg by using 10 kg/s air which comes in at 1400 K and leaves with 600 kJ/kg less availability. What is the second law efficiency?
A.	0.625
B.	0.825
C.	0.925
D.	0.725
Answer» C. 0.925