What value should be chosen for the heat transfer coefficient?
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Piped liquid CO2, pressure 2 MPa, inlet temperature -24°C, outlet temperature 10℃； Shell side water, temperature 20°C. The heat exchange tube material is 304. To ultimately vaporize CO2, what is an appropriate value for the heat transfer coefficient to use in the heat transfer calculations?
You can refer to what is available in the Chemical Engineering Design Handbook
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Calculations can be performed using the HTRI software
Just calculate it by yourself. Checking the manual works too
Roughly, it can be estimated, but construction design requires precise calculations.
I used HTRI for the calculations. I’m not sure what your CO2 flow rate is; I used 1 kg/s in my calculations, which yields approximately 240 W/m2K. The values provided in the manuals are quite rough, so it’s better to do the calculations yourself :)
One cannot simply rely on the heat transfer coefficient, as that is very inaccurate and only provides a rough estimate.
For stainless steel, in the case of gas flow and vaporization, such scenarios haven’t been taken into account; refer to the value for Freon, which is around 60~
You’re being too vague; you haven’t even chosen a structure yet, so how can there be a heat transfer coefficient! There are also factors such as the flow rate of the medium.