I would like to ask about the formula for the logarithmic mean temperature difference of heat exchangers
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For counterflow: http://hgyl.wlkc.dlpu.edu.cn/chem3/chem3_4/images/chem3-4-6030.gif Is the same formula used when air flows in the shell side as well? Is there anything else?
First, it has nothing to do with what materials are used； Second, the logarithmic mean temperature difference cannot actually be used as the effective temperature difference of a heat exchanger; the effective temperature difference = logarithmic mean temperature difference x temperature difference correction factor. Ignoring the temperature difference correction factor can lead to significant errors ； Finally, if you’re interested, give them a try: http://www.htcsoft.com/themtrial.zip
Reply to 2# wiseboy: Thank you very much, I understand