For shell and tube heat exchanger, is there a standard or a preferred ratio of shell length and shell diameter?
We have TEMA standards. Based on standard tube length and pitch selected, the number of tubes required for a heat load is estimated. The shell dia is then selected from the standards. I dont think that any preference is left to the designer.
We have TEMA standards. Based on standard tube length and pitch selected, the number of tubes required for a heat load is estimated. The shell dia is then selected from the standards. I dont think that any preference is left to the designer.
I think that TEMA standards has a tight restrictions on the design of a shell and tube heat exchangers. The designer decision of the tube layout and pitch determine the shell diameter and heat transfer aspects. The length of the heat exchanger represents the results of the designer choice for the tube layout, pitch, baffle spacing and any other related parameters. Briefly, the length of the heat exchanger is a sort of art of the design philosophy, available space, accepted shape design and external dimensions ratio.
you may find the answer in this paper "Deep Heat Transfer Performance and Ratio of Length to Diameter in Shell and Tube Heat Exchangers" by Fuhua Jiang, Xianhe Deng
in practice as far as steel plates are made 1.5 meter wide and a cylinder of a vessel is manufactured by rolling of the plates usually. In the HX is large, it can be a factor of 1.5 meter. Space and foundation that the Hx is going to be installed and is an important factor. The saddles are also have to be considered to fully fix a control the vessel. Generally there is a ratio between height and diameter of a heat exchanger that is about 1.5.
I just saw this question. I don't know if my answer is still relevant. Anyway, here it goes:
The L/D ratio can go from 5 to 15 in extreme cases. But the preferred range is between 6 and 8. Such a heat exchanger is often termed 'a well-designed' heat exchanger, though I would prefer to call it 'well-proportioned'. You may not have easy access to TEMA. I have a number of papers on shell-and-tube heat exchanger design and optimization and would be glad to share them with you. As there may be copyright issues, I suggest that you make a private request through RG if you are in need of them. There is an excellent summary by Rajiv Mukerjee which I have attached.
Thanks Dr Raghavan. the connection with you will make me pleasure.
I need to know any practical example how changing standard affect the
heat exchanger design.
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