【Daily Question】Theoretical Foundation 2020.12.10
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Multiple-choice question: The question is shown in the image ( ). Answer: B. Hint: An additional reward will be given to those who can explain the solution process; the answer can be submitted there
The correct answer is B. In external condensation heat transfer of horizontal tube bundles, such bundles are often composed of multiple tubes; the condensate from the upper layer of tubes flows down to the lower layer, causing the film layer on the surface of the lower layer’s tubes to thicken and reducing the heat transfer efficiency. As a result, the heat transfer coefficient h for the lower layer is smaller than that of the upper layer.