Heat exchanger calculation issues
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We usually use HTRI and HTFS to perform calculations and select heat exchangers. I would like to ask what constitutes a satisfactory result from these calculations, that is, by how much should the design be overdesigned to be considered acceptable. Additionally, if there is phase change overdesign, what amount is appropriate? What should be the flow velocities of the gas and liquid phases within the tubes and shell side of the heat exchanger?
The result calculated in HTFS is the ratio of the actual area to the required area, which is generally between 1.1 and 1.2; in addition, the calculation must also take into account the fact that the pressure drop should not exceed the allowable value. As for the other questions raised by the original poster, I’m also very interested and look forward to experts providing explanations!
There are no specific criteria for the results obtained during calculation; generally, it is sufficient as long as the actual area of the heat exchanger is greater than the required area. The amount of margin can be determined at your own discretion, based entirely on your actual circumstances. Additionally, attention should be paid to constraints such as flow rate, pressure drop, and vibration.