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. What is the overall heat transfer coefficient if the convective heat transfer coefficient for annulus side is 496 W/m2K and for the inner tube is 530 W/m2K?

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. What is the overall heat transfer coefficient if the convective heat transfer coefficient for annulus side is 496 W/m²K and for the inner tube is 530 W/m²K?
A.	228.6 W/m<sup>2</sup>K
B.	220 W/m<sup>2</sup>K
C.	256.2 W/m<sup>2</sup>K
D.	212 W/m<sup>2</sup>K
Answer» B. 220 W/m<sup>2</sup>K

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