Regarding the air flow direction in finned tube radiators
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Fin-type air heater, with steam as the heat medium. The diagram shown above indicates the direction of air flow as provided by the manufacturer, right?
Wouldn’t it be better to heat the air first through the condensate section and then through the steam inlet section?
Heat exchange can be in co-current or counter-current mode. Is this type of heat exchange called “cross-flow” heat exchange? ? ? I forgot. In this process, air is used to recover heat; steam releases heat and absorbs cold energy through heat exchange, thereby turning into condensed water. Heat is transferred to the air, and this heat is then used to warm other things; the air is merely a carrier. It is recommended to get a copy of \"Principles of Chemical Engineering\"; it is an essential reference book for anyone working in this industry.
I know that the average temperature difference in counterflow is greater than that in co-flow, which means a smaller heat exchange area is required as well as lower investment in equipment. So isn’t it better to use counterflow when the goal is to heat air?
There are many factors in this design, mainly considering air pressure and flow rate limitations. Regarding the dynamic aspects of air, factors such as the increase in energy-consuming equipment also need to be taken into account. It is recommended to gain a comprehensive understanding of the process; one should not try to figure things out blindly. With all due respect. For reference.
I think that for the steam condensation condition, counterflow and co-flow have little impact on heat transfer, as the heat is concentrated in the phase-change condensation process, and there is ultimately very little heat in the supercooled liquid portion. If high-temperature water is flowing through it, I think the direction of air intake and exhaust should be reversed; otherwise, temperature mixing will occur.
Thank you to all the teachers for their guidance; I am extremely grateful:handshake
It depends on the operating conditions; some air pipelines have a top-to-bottom structure.