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Originally Posted by pHaestus
It seems like Les's model actually slightly overestimates resistance if you look at Bill's data compared to the model.
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Hard to say - quite a number of subtle differences between different cores. I'm just going by what I've experienced. I also believe that the water-air heat transfer efficiency at 12FPI is a little better than calculated by Kryotherm at low air-flow rates, again based upon practical use. I suspect that this may be due to the fine cut-rippling that heater-core fins have.
My thoughts are more empirically based, and I just have a very confident feeling that 12FPI with weak low volume fans works out substantially better than calculated, and that when coupled with the air-flow resistance it just makes more sense for very low-flow/pressure fans.