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 _____________________?

Question

Accepted Answer

333 W/m2.K. The overall heat transfer coefficient with fouling is calculated by dividing the clean value by (1 + fouling factor/clean value), which gives 400 / (1 + 2000/400) = 333 W/m2.K. Option A is incorrect because it does not represent the correct calculation for fouled heat transfer. Option B is incorrect because it uses an incorrect formula or values. Option D is incorrect because it does not match the calculated result.