Can a finned heat exchanger be used to heat water with steam?
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Steam is generally used to heat water with shell-and-tube exchangers; I think that if finned exchangers are used, the contact area being larger than that of shell-and-tube exchangers would result in a relatively smaller equipment size. But several manufacturers were asked and all said they couldn’t do it – why is that? (Vapor pressure 0.2 MPa)
You can ask @TaihuRonin, @SeniorDesignNovice, and so on about this
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It is independent of the water vapor pressure, as the heat transfer coefficient on the water vapor side is very high; even with the addition of fins, the improvement in heat transfer is limited, making it uneconomical.
Re-calculations of heat exchange theory are required, along with model testing for verification
Fins are generally used for air cooling, right? Exposed type. Three light tubes can be placed in the space of one finned tube, which is smaller than before.
Regarding heat exchange with soda water, Hangzhou Watt Energy Saving believes that no treatment is required on the steam side; the significant reduction in volume resulting from the condensation of steam itself facilitates heat exchange, as long as the condensed water and non-condensable gases are removed promptly. For the water side, adjusting the flow state of the water (turbulence) and flow velocity has a certain effect. The effect of fins is to increase the contact area, but it causes water to accumulate in the part that actually serves as the effective heat exchange area. Therefore, soda heat exchanger plates, floating coils, and plain tubes are all good choices.
Just use a plate type one – there’s no need for such complexity. Use a regular one for steam temperatures below 140, and a fully welded one for higher temperatures
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Because if you want to use a finned tube heat exchanger, first, the resistance of the fins on the tubes is high, which hinders heat exchange; second, finned tube heat exchangers are generally used to exchange air with hot or cold media. If you want to use steam to heat water while keeping the space occupied small, you can opt for a spiral plate heat exchanger, whose heat exchange efficiency is 30% higher than that of shell-and-tube heat exchangers, offering the best cost-performance ratio
Fin-type is indeed not suitable. It would be best if you used a plate heat exchanger. Plate heat exchangers are the most suitable for this type of steam-water heat exchange. It has a high heat transfer coefficient and a small size; in fact, it is much smaller than shell-and-tube exchangers.