Easy to get boggled down on all these equations without need. The proposed calculations in this thread are for the most part noodling by people who would rather spend time doing this than their gainful employment. I don't have the time or the will to run all the calcs; would just make a crude manometer and measure flow rate like that. Much easier to just crudely measure flow rate through the entire loop and then look back at pump's P-Q curve to determine the head that corresponds to that flow rate.
My article is more of a guide to choosing loop layout and design. Some mention of Darcy eqn and (more importantly) K coefficient for valves, elbows, and Ts. Not math heavy at all, just uses some available numbers to illustrate points.
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