The effectiveness of a counter-flow heat exchanger has been estimated – McqOptions

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1.	The effectiveness of a counter-flow heat exchanger has been estimated as 0.25. Hot gases enter at 200°C and leave at 75°C. Cooling air enters at 40°C. The temperature of the air leaving the unit will be:
A.	60°C
B.	70°C
C.	80°C
D.	90°C
Answer» D. 90°C

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