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 _____________________?

Related Mcqs:

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is________________?

A. 1.26 h1 B. 0.794 h1 C. 0.574 h1 D. 1.741 h1...

Tube expansion allowances exist in _____________ heat exchanger?

A. Multipass fixed tube sheet B. U-tube C. Single pass fixed tube sheet D. None of these...

The unit of heat transfer co-efficient in SI unit is____________________?

A. J/M2°K B. W/m2°K C. W/m°K D. J/m°K...

A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an___________________?

A. Ellipse B. Straight line C. Parabola D. Circular arc...

For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area___________________?

A. Increases B. Decreases C. Remain constant D. Passes through a maxima...