Quote:
Originally posted by winewood
Bill recommended (THIS) site to me. I think it says what joemac and I are thinking.
It is by "myv65 (Dave Smith)" and I believe this is the best article I have read on pumps and flow rates. It measures temperature as well. Look at the 3rd graphic.
Basically the pump is pulling water into itself faster that water is provided. Therefore there is a change of pressure in the loop.
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It is an excellent article. However, it is an article about pump issues. While the pump issues need to be considered in the overall design of the system, the effect of flowrate on radiator effectiveness can be considered in isolation from the pump. (As shown in the Lytron charts.)
Perhaps some study of the phrase "incompressible fluid" would be in order.