Issues regarding converting plate exchangers to shell-and-tube exchangers
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I just started working, and I’ve encountered this issue: the client wants to replace 20 plate heat exchangers with shell-and-tube heat exchangers. I was wondering how much better the heat exchange efficiency of plate heat exchangers is compared to that of shell-and-tube heat exchangers? Under the same heat transfer rate, by how much is the heat transfer area of a shell-and-tube heat exchanger generally larger than that of a plate heat exchanger? What is the difference in heat exchange efficiency between copper tubes and ordinary carbon steel tubes?
Recalculation is needed; generally, the heat transfer coefficient of plate exchangers is about twice that of shell-and-tube exchangers.
Original poster, could you please describe the process media on both sides? The differences between different materials also vary
It’s not possible to make comparisons based solely on area; the differences between plates and tubes lie in fluid flow velocity, surface heat transfer coefficient, and flow resistance. It is necessary to recalculate everything starting from the initial heat balance, and it definitely cannot be determined simply by considering the heat transfer area
Any of the tubes you mentioned will work; it depends on the user’s requirements. The area required should be calculated accordingly, as the heat transfer coefficient of plate exchangers is generally 3 to 5 times that of tube exchangers.
The shell side fluid is N46 hydraulic oil, which belongs to the category of lubricants; the inlet and outlet temperatures are 40°C and 33°C respectively； The tube side uses circulating water, with inlet and outlet temperatures of 20°C and 25°C on the shell side. I’m recalculating now. Where can I find the thermophysical properties of industrial oils? ? Or can we refer to the thermophysical properties of those media?
Excuse me, do you know how to find the thermophysical properties of industrial lubricants? ? Or what kind of medium parameters can be referred to? ? Thank you