The issue of fixing the metal wall temperature of the tube sheet
Thread Content
There is a fixed-tube-sheet heat exchanger, and there are 4 values for the metal wall temperature of the heat exchange tubes. Shouldn’t the normal metal wall temperature be just one value? Why are there 4 values? How should these values be entered when calculating the strength of the tube sheet?
It is crucial when calculating the tube bundle stiffness, especially when the temperature difference between the tube side and the shell side is large. It is necessary to estimate a relatively reliable metal temperature of the heat exchange tube.
There may be four operating conditions for the tube train, calculated based on the temperature difference between the tube side and shell side.
This metal wall temperature is provided by the process data; if there are four operating conditions, all of them should be reflected
As a heat exchanger, temperature imbalances are inevitable in order to enable heat exchange between the tube side and the shell side, thereby fulfilling its purpose and function
The different operating condition data provided in the process should all be accompanied by explanations.
This has always been a problem; standard processes don’t provide such comprehensive coverage.
There are no instructions; only four metal wall temperatures are provided. How is the strength of the tube sheet calculated?
If it’s not four operating conditions, then it’s the metal temperature at four points; you should consider the maximum temperature difference.
Since the process description is not comprehensive, it is best for the original poster to carry out calculations for the four operating conditions based on the combination that results in the greatest wall temperature difference, as a precaution.