Consider we have a Double Pipe Heat Exchanger, with the inner tube of Outer diameter 20mm (thickness 2mm) and outer tube of inner diameter 30mm. We have two fluids A & B, we desire to have their flow rates as 15 Kg/s and 21 Kg/s respectively. Calculate the convective heat transfer coefficient from tube to annulus side. (Given Nusselt number on tube side = 496 and K = 15W/mK)

Consider we have a Double Pipe Heat Exchanger, with the inner tube of

1.	Consider we have a Double Pipe Heat Exchanger, with the inner tube of Outer diameter 20mm (thickness 2mm) and outer tube of inner diameter 30mm. We have two fluids A & B, we desire to have their flow rates as 15 Kg/s and 21 Kg/s respectively. Calculate the convective heat transfer coefficient from tube to annulus side. (Given Nusselt number on tube side = 496 and K = 15W/mK)
A.	2067 W/m<sup>2</sup>K
B.	1653 W/m<sup>2</sup>K
C.	1623 W/m<sup>2</sup>K
D.	1673 W/m<sup>2</sup>K
Answer» C. 1623 W/m<sup>2</sup>K

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