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

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1.	For the calculation of Overall Heat transfer coefficient UD, for given fouling factor Rf and Dirt Factor Rd, which one of the following expressions do we use?
A.	(UC-1 + Rd-1+ Rf)-1
B.	(UC-1 + Rd+ Rf)-1
C.	(UC-1 + Rd+ Rf-1)
D.	(UC-1 + Rd + Rf)
Answer» C.

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