Flow cross-sectional area of the heat exchanger
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Does anyone know how to interpret the flow cross-sectional area s=hD(1-d/t) for the shell side of a heat exchanger?
The flow area at the inlet and outlet of the shell side should be no less than the cross-sectional area of the inlet and outlet nozzles; specific calculation formulas are provided in Appendix K of GB151.
There is a detailed explanation of this in the heat exchanger design manual; I recommend that you take a look.
s=hD(1-d/t). S refers to the maximum flow area at the central tube between the two plates, or near the central tube (on either side of the partition) ； h---refers to the distance between the two folding plates ； D---Inner diameter of shell ； d----outer diameter of heat exchange tube ； t-----Heat exchange tube spacing. It becomes clearer if the formula is rewritten as S=h(D-dD/t); D/t represents the number of tubes at the center tube or near the center tube (on both sides of the partition) ； dD/t---is the total projected width of the outer diameters of the heat exchange tubes at the center tube or near the center tube (on both sides of the partition).