A counter flow shell and tube exchanger having an area of 32.5 m2, is – McqOptions

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1.	A counter flow shell and tube exchanger having an area of 32.5 m2, is used to heat water with hot exhaust gases. The water (Cp = 4.16 kJ/kg K) flows at a rate of 2 kg/sec while the exhaust gases (Cp = 1.03 kJ/Kg K) flow at a rate of 5.15 kg/sec. If the overall heat transfer surface coefficient is 200 W/m2K, the NTU for the heat exchanger is
A.	1.2
B.	2.4
C.	3.6
D.	4.8
Answer» B. 2.4

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