Calculation and determination of the wall temperature of the heat exchange tubes in shell-and-tube heat exchangers
Thread Content
How is the wall temperature of the heat exchange tubes in a soda water heat exchanger calculated? For example, the steam flows in the shell side at 350°C, while the condensate at 90°C is heated by water flowing in the tube side; the inlet temperature is 70°C and the outlet temperature is 120°C. How should the wall temperature be determined when calculating the strength of the heat exchange tubes? The reason for seeking help is that, according to the standards, it’s quite complicated to determine the heat transfer coefficient through calculations! How do you usually choose? What is the basis?
The wall temperature of the heat exchange tube can only be calculated based on the heat transfer coefficients and fouling thermal resistances of the hot and cold fluids; otherwise, the result will not be accurate. For fixed-tube-sheet heat exchangers, the wall temperature of the heat transfer tubes is a key parameter.
This post was last edited by wanlirn on 2018-11-26 at 10:30. It’s a hot water network heater, right? If used to calculate strength, the highest temperature should be taken; for heat transfer calculations, an estimated formula can be used: wall temperature = TS – 0.6*ΔT, where TS is the saturated steam temperature and ΔT is the average temperature between the inlet and outlet
The wall temperature is equal to TS – 0.6*ΔT. Where does this formula come from, and is it based on any evidence?
This post was last edited by wanlirn on 2018-12-11 10:47. What’s the basis? You might not be familiar with thermal calculations; it doesn’t matter. It’s essentially an iterative calculation, with the final heat transfer value serving as the basis. . . This formula is used to roughly estimate a value in order to reduce the number of iterations