Proii calculation of heat exchanger convergence issues
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I have a question regarding the use of PROII for calculating heat exchangers. Sometimes, when using PORII to calculate heat exchangers, the calculation may not converge due to inappropriate inlet and outlet conditions; or even slight adjustments to these conditions (such as a change of 1 or 2 degrees in temperature) can result in significant differences in the calculation results (such as the required heat transfer area). But logically, once the inlet conditions for the hot and cold fluids are determined, as well as the design of the heat exchanger, there should be fixed outlet temperatures for those fluids. But why doesn’t it converge? This post was last edited by suiran983527 on 2009-2-11 14:45.]
If a phase change occurs during this 1-2 degree variation, it can cause significant changes in the calculation results; it seems that pro11 isn’t very useful for such design tasks. Right now I use it to specify the heat transfer medium and the dimensions of the heat exchanger, then check the outlet temperature and see whether the overall heat transfer coefficient falls within an appropriate range. “As long as the inlet conditions for the cold and hot fluids are determined, as well as the heat exchanger, there should definitely be fixed outlet temperatures for the cold and hot fluids. The problem here is that the heat transfer coefficient does not meet the required standards, which is why no convergence occurs. In your case, the heat balance is achieved, but heat transfer is not; in other words, the condition Q=UA△t cannot be satisfied. This post was last edited by LTY on 2007-12-7 17:24 ]
I agree with what was said above. In a heat exchange calculation I performed, increasing the outlet temperature by 3 degrees caused significant changes. I didn’t know why at first; but after looking at the dew point of the substance, I realized that a phase change was taking place
Could you guys send me your software? Thank you! xmw6363@163.com
Could you guys send me your software? Thank you! xmw6363@163.com
Use Ares to download it; with a good internet connection, the speed will be fast.
Thank you very much to the original poster for providing the information: lol :victory: