How should I design this heat exchange system?
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One of the heat exchangers in our workshop is a single-pass shell and tube heat exchanger; the tube bundle is made of 304 material, the fluid flowing inside the tubes is metal oxide particles, the heat medium flowing in the shell side is hot air, and there are no baffle plates inside the shell. The process requires heating the metal oxide particles from 180°C to 230°C. Now we need to replace the heat medium from hot air with heat transfer oil, and use an electrically heated heat transfer oil system; the type of heat exchanger cannot be changed. How should I determine the heat exchange area of this heat exchanger? (The heat exchanger can be appropriately lengthened or equipped with baffles.) The heat load has been determined; what other values are needed? Please give some guidance – something basic and specific!
This question isn’t just imagined, is it? Is it to make the popcorn maker longer? :lol :lol :lol Add some partitions; it will definitely work, no need to enlarge the heat exchanger. (Can heat exchangers also be lengthened?) ）
To add further, the heat exchanger needs to be remade.
I don’t know how to calculate the parameters for liquid-solid heat transfer. It seems a bit better if the side with the solid is fluidized. Otherwise. . .
Length of the tube rows, diameter of the tubes, number of tubes. Density, flow rate, heat capacity, and heat transfer coefficient of heat transfer oil.
If that really doesn’t work, consider adding finned outer fins to increase the heat exchange area and heat transfer coefficient.
If data is unavailable, find a fluid similar to the medium inside the pipe and conduct calculations; let the data speak for itself. If the heat transfer effect is not satisfactory, then consider methods to enhance heat transfer. Also, I personally think it should be sufficient; changing the shell-side gas to a liquid should increase the heat transfer coefficient. As for whether to add baffles in the shell side, it depends on the calculation results – specifically, whether it is necessary to increase turbulence to enhance convective heat transfer, as well as considering the pressure drop requirements of the heat transfer oil system.
Does the viscosity of the heat transfer oil also need to be taken into consideration, as it affects its flow within the heat exchanger?