If UD = Overall Dirt Heat Transfer coefficient and Uc = Overall Clean Heat Transfer coefficient, then which of the following relation is correct?

If UD = Overall Dirt Heat Transfer coefficient and Uc = Overall Clean

1.	If U_D = Overall Dirt Heat Transfer coefficient and U_c = Overall Clean Heat Transfer coefficient, then which of the following relation is correct?
A.	U<sub>D</sub> > U<sub>c</sub>
B.	U<sub>D</sub> < U<sub>c</sub>
C.	U<sub>D</sub> = U<sub>c</sub>
D.	U<sub>D</sub> >> U<sub>c</sub>
Answer» C. U<sub>D</sub> = U<sub>c</sub>

Discussion

No Comment Found

Related MCQs

If there are N shell passes in a shell and tube HE, then which one of the following relation is correct foe the pressure drop a shell side?
Consider we have a shell and tube Heat Exchanger, with the inner tube of diameter 30mm (neglect thickness) and shell of diameter 100mm. We have two fluids A & B (both with viscosity 2.5 10-5Pa-s), we desire to have their flow rates as 4 Kg/s(tube) and 5.3 Kg/s(shell) respectively. What is the Friction Factor (F) for this setup for the shell if it has triangular pitch with Pitch = 40mm?
In the calculation of Reynold s Number for the Friction factor of the shell, which is the correct formula for equivalent diameter De?
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?
What is the Pressure drop equivalent for 7 tube passes?
Consider we have a 2-4 Shell 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(tube) and 21 m/s(shell) respectively, friction factor of 0.00096 and 2 tubes of length 0.4 m. What is the value of Pressure drop for the inner tube due to frictional losses?
Consider we have a 2-4 Shell 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 15m/s(tube) and 21 m/s(shell) respectively, friction factor of 0.00096 and length of the tube as 1m. What is the value of Frictional Head Loss for the inner tube?
For the calculation of Friction Factor on the Shell side, which one of the following is the correct formula?
If we desire to use a fluid with high pressure operation, we prefer to keep it in the tube side.
We have a fluid of dirt factor 0.00035 which we want to use in our operation. During design calculations we find the dirt factor to be less than that of the fluid, we pass the setup for industrial use.

If UD = Overall Dirt Heat Transfer coefficient and Uc = Overall Clean Heat Transfer coefficient, then which of the following relation is correct?

Discussion

No Comment Found

Related MCQs

Reply to Comment

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