Superheated steam to heat air
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Dear experts: When using superheated steam at 300°C to heat air at 20°C to 250°C, how can we determine their heat transfer coefficients, and what type of finned tube is suitable? How large is the thermal resistance of superheated steam? Looking forward to a reply, thank you!
Although the water vapor pressure is not specified, it can be inferred from the air outlet temperature that it is likely a gas-to-gas heat exchanger that makes use of the sensible heat of water vapor. At such high temperatures, the performance and lifespan of external fins are generally not optimal; you can send a private message with the detailed parameters, and I will provide you with a proposal for a heater using internal fins.
Steam flows inside the tube while air flows outside; what should be the heat transfer coefficient? What value should be used for the temperature difference?
Find a manufacturer of air preheaters to provide a quote and technical proposal. For basic heat transfer elements, bimetallic rolled finned tubes or through-fin finned tubes are more suitable.
After selecting the heat exchanger, does one need to choose a drain valve for it as well? All steam traps have a certain rate of steam leakage; I can reduce this leakage. Would you like to learn more about it? :Lol, it is also possible to extract flash steam for reuse, thereby reducing steam consumption and achieving energy savings and lower costs.