Wow, I can't believe we are still debating this.
It is clear - inlet to outlet temp differential is a function of the heat input and flow rate only. That's it.
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No matter how you put it, there's a close relationship between inlet / outlet temp diff and total heat coefficient.
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Nope. Well, not really anyway
. There is correlation, but no causality.
If you have a higher flow rate, you will have a lower inlet/outlet delta-T. That's true. And if you have a higher flow rate, you will have a higher heat transfer coefficient. Also true. But to say that a lower inlet/outlet delta-T causes a higher heat transfer coefficient is technically incorrect. It is the higher flow rate that causes both the lower delta-T and the higher heat transfer coefficient.
And Dix - yes, maybe a couple of opening flames generates more interest in the thread. But it's bad interest. Look at the last few posts - little information, mostly flames and explanations of why a flame wasn't really a flame.
It's a sad state of affairs when a post more than 10 lines long gets ignored. But at least those that might benefit may read it.
Please, someone read my earlier post, and if you have a question ask it. But it seems like the concept has fallen on deaf ears.