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

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1.	For the calculation of Dirty Overall Heat transfer coefficient U_D, for given fouling factor R_f and Dirt Factor R_d, 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.	U<sub>D</sub> = U<sub>C</sub> + R<sub>D</sub>
D.	U<sub>D</sub> = (U_C+ frac{1}{R_D} )
Answer» C. U<sub>D</sub> = U<sub>C</sub> + R<sub>D</sub>

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