How is the \"average shell-side cylinder metal temperature along the length\" (P69) defined in GB/T151?
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As the title says. This parameter is provided by the process engineering team based on the calculation values from the chemical engineering software. But how does the software do the calculations? Is there a detailed explanation? For single-pass fixed-tube-sheet heat exchangers, after examining several sets of process conditions, the average metal temperature is essentially the average of the inlet and outlet temperatures on the shell side; there is a slight error, but it’s very close to that value, which is accurate enough for engineering applications. So, for multi-tube heat exchangers, how is this value determined? Thank you.
Appendix B of GB/T151-2014 contains the calculation methods