The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m2.K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m2.K. The overall heat transfer co-efficient at this time is _____________________?
A. 287 W/m2.K
B. 333 W/m2.K
C. 894 W/m2.K
D. 1200 W/m2.K
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