What is a little "puzzling" about the BIP vs BIX curves is that either radiator appears to be exhibiting a peak at around the 1.5-2.0gpm mark.
What is puzzling is when we consider that the BIP is a single-row core, and the BIX is a dual row core. Both are two-pass cores.
The water velocity through the cores is going to be twice as high through the BIP as the BIX, so why do they exhibit roughly the same curve peaks if we are to assume that the improved performance is coming from increased convectional efficiency between the water and the tube walls?
Methinks that something else is at play here, and its effect just happens to be larger than convectional gains, but that's just a gut feeling. I can offer no suggestions as to what might really be going on.
Bill, have you re-assessed any of the Thermochills rads under your new test setup? Your old test data seemed to imply that they continued to improve at least up until the 3gpm mark.
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