HTRI air cooler calculation overall coef, design/clean/actual

2018-09-28View Original

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This post was last edited by zengjie on 2018-9-28 at 13:47. Hello, fellow sailors. I am a beginner at HTRI, using it to calculate an air cooler; the calculation results are shown in the figure below. Regarding the overall coefficient, design/clean/actual: in my understanding, the design coefficient refers to the heat transfer coefficient of 7.248, which is calculated based on the designed heat exchange area. Clean refers to the heat transfer coefficient when there is no fouling, while actual is the value calculated using heat transfer formulas when there is fouling. But why is my film coefficient for heat transfer outside the tube 60.89, while the film coefficient inside the tube is 139.9, when fouling is ignored? ； The overall heat transfer coefficient is actually 4.923. Is it a setting issue here?

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HTRI air cooler calculation overall coef, design/clean/actual

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