To calculate the efficiency of a double pipe heat exchanger, the formu

1.	To calculate the efficiency of a double pipe heat exchanger, the formula is
A.	€ = \(\frac{X}{Maximum \, possible \, rate \, of \, Heat \, Transfer}\), where X stands for _________
B.	Clean tube rate of heat transfer
C.	Experimental rate of heat transfer
D.	Actual rate of heat transfer
E.	Minimum rate of heat transfer
Answer» D.

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