Ok, I had to read that twice to get it...
The delta t involved between the block inlet and outlet is, as Bill reported, so small, that even he would be hard pressed to measure it, and does not have the required instrumentation to do it (right?).
So if that's true, then you'd also be hard pressed to measure a temp difference under a higher flow rate.
Keep in mind that a system will typically have a capacity that is less than 1/2 gallon, and typical flow is ~ 1 gpm (60 gph). That translates in the water passing by the same point twice per minute.
Hummm...
Let's try another angle: if the same flow carries the same heat, and you double the flow rate, the higher flow is absorbing the same energy, as you stated, but the same flow is also releasing the same energy through the rad.
I'm either rambling, or going in circles...
It's easier for me to see it as a series of thermal resistances, where the higher flow rate decreases the thermal resistance, and where the rad will behave in an odd way at different flow rates, for reasons that only a handful of us understand clearly, and that does NOT include me!
Sorry, someone else take this one.
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