A balanced counter flow heat exchanger has a surface area of 20 m2 and – McqOptions

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1.	A balanced counter flow heat exchanger has a surface area of 20 m2 and overall heat transfer coefficient of 20 W/m2–K. Air (CP = 1000 J/kg - K) entering at 0.4 kg/s and 280 K is to be preheated by the air leaving the system at 0.4 kg/s and 300 K. The outlet temperature (in K) of the heated air is ___
A.	290
B.	300
C.	320
D.	350
Answer» C. 320

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