For the calculation of Dirty Overall Heat transfer coefficient UD, fo – McqOptions

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1.	For the calculation of Dirty Overall Heat transfer coefficient UD, for given fouling factor Rf and Dirt Factor Rd, which one of the following expressions do we use?
A.	\(\frac{1}{U_D} = \frac{1}{U_C} + R_D\)
B.	\(\frac{1}{U_D} = \frac{1}{U_C} + \frac{1}{R_D}\)
C.	UD = UC + RD
D.	UD = \(U_C+\frac{1}{R_D}\)
Answer» C. UD = UC + RD

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