I have a tank of water with a variable speed pump to pump water to solar collectors on the roof. The return pipe from the collectors comes back to the tank creating a closed flow loop. The roof is 15m above the tank. I am expecting the flow to run through the system if the pump just compensates the pressure drop due to friction in the pipe (because the fluid circuit is a closed loop). Whereas this doesn't happen. If the pump slows down and generates a head below a certain threshold the flow in the return pipe from the collectors separates. I am guessing that at the top of the circuit the pressure drops below the vapor pressure of water. Can anyone clarify on this and let me know how to run water at low flow rates in such cases?
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