For the calculation of Overall Heat transfer coefficient for fouling factor R, which one of the following expression do we use?

For the calculation of Overall Heat transfer coefficient for fouling

1.	For the calculation of Overall Heat transfer coefficient for fouling factor R, which one of the following expression do we use?
A.	(hi-1+ho-1 + R-1)
B.	(hi-1+ho-1 + R)-1
C.	(hi + ho + R)-1
D.	(hi-1+ho-1 + R-1)-1
Answer» C. (hi + ho + R)-1

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