Christ, I'm gone for a day and BillA manages to blow everyone's cerebral cortex. Let me get the paper towels.
Okay, BillA, I don't know exactly why you're getting the charts you're getting. Not saying you're violating any rules of physics, but your current explainations, if I'm reading them right, are. For your rad, the heat transfer coefficient of the air should not be adversely affected by improving the heat transfer coefficient of the water. They are completely independent phenomena.
My first job when something goes against theory is to recheck everything. What sort of precision can you get by generating replicate data? What is the accuracy of your temperature measuring equipment? Your flow metering equipment? Your pressure metering equipment? What are your raw data so others can check your calculations?
And, assuming you're correct on all this, what is really happening?
Alchemy
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