Heat Transfer Operations Mock Test 3

1. Recognize the following fin.

2. Which type of fin is not used in Plate-Fin Heat exchangers?

3. Recognize the following fin.

4. What is the maximum baffle spacing for a Shell and Tube Heat Exchanger?

5. What is the term X in the following equation for overall heat transfer coefficient?
\(\frac{1}{U}= \frac{1}{hAb}+\frac{X}{K}+\frac{1}{hAc}\)

6. If U_D = Overall Dirt Heat Transfer coefficient and U_c = Overall Clean Heat Transfer coefficient, then which of the following relation is correct?

7. A jacket has a lower heat transfer rate and coefficient than a coil.

8. Consider we have a 2-4Shell and Tube Heat Exchanger, with the inner tube of Outer diameter 20mm (thickness 2mm) and shell of inner diameter 100mm. We have two fluids A & B, both of density 990 Kg/m³, we desire to have their flow rates as 15 m/s and 21 m/s respectively, friction factor of 0.00096 and 4 tube of length 0.4 m and 2shell passes. If the maximum pressure drop allowed on shell side is 10atm, is the setup suitable for industrial use?

9. Fins can be added only to one side of a heat exchanger.

10. What is the flow area of the given setup of fins in double pipe heat exchanger?

Given the thickness of fin = 5mm, diameter of inner and outer tube are 20mm and 40mm respectively and the length of tube is 1metre.