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In a double pipe heat exchanger if the inner diameter of inner pipe is 6cms. and outer diameter is 8cms. respectively and pipe has a

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In a double pipe heat exchanger if the inner diameter of inner pipe is 6cms. and outer diameter is 8cms. respectively and pipe has a length of one metre .If the rate of heat transferred is 60W, overall heat transfer coefficient based on out side diameter is if temperature differene is 60C Select one: a. 1.56W/m2C b. 0.000156W/m2C c. 0.00156W/m2C d. 0.0156W/m2C

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