Calculation of the perturber air preheater
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Recently, I have been thinking about designing a pure tubular air preheater with turbulence elements on the air side. But what is the actual impact of the flow disruptors on the heat transfer coefficient on the air side? I checked available information but found no authoritative data on the subject. I was wondering if any experts could offer some guidance?
The heat transfer coefficient of such flow disruptors is not commonly used; in other words, there are no theoretical values available for reference. To determine it accurately, experimental measurement is likely the only option.
Experimental study on enhancing heat transfer by inserting twist ties inside tubes. I’m also looking for this paper; once you find it, feel free to share it...
I designed one unit; the user was from Ma’anshan. The original design was carried out by a Japanese company, and we also had our own accurate calculation methods. Later on, we simply used the heat transfer coefficient without the flow disturbance strip and multiplied it by 1.35, while maintaining the assembly dimensions from the original design. It’s been in use since 2002 with no problems, and the performance is excellent. The originally designed product lasted only 1 year at a temperature of 550 degrees; the Japanese used 20G tubing, while we changed it to 0Cr13.
4# ssun*nhong, big bro upstairs, since there’s a complete calculation method, why not share it?