A counter flow shell and tube heat exchanger is used to heat water wit – McqOptions

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1.	A counter flow shell and tube heat exchanger is used to heat water with hot exhaust gases. The water (C = 4180 J/kg K) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 J/kg K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 Q/m2K, the NTU of the heat exchanger is
A.	4.5
B.	2.4
C.	8.6
D.	1.28
Answer» E.

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