mbartosik
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For a ground source heat pump you need constant flow (not pressure).
For multiple stages of heat pump (in parallel) you need variable flow (or staged flow).
With a constant pressure system like Franklin Monodrive (variable speed drive) it is possible to regulate pressure, and then use multiple valves to change the flow for the fixed pressure. This either means wasting pressure at lower flow stages or using multiple pressure sensors (switched via a relay).
Alternatively I wonder about just having a constant or staged flow system.
I wonder if this could be done by replacing the pressure switch on the MonoDrive with a flow meter like this (http://www.proteusind.com/800_flow_meter/DS_800_001.pdf).
Since the cost to me of adding a relay and extra pressure switch is less I will probably do that now. But if I was starting from scratch I wonder if using a flow meter in place of the pressure switch would work?
For multiple stages of heat pump (in parallel) you need variable flow (or staged flow).
With a constant pressure system like Franklin Monodrive (variable speed drive) it is possible to regulate pressure, and then use multiple valves to change the flow for the fixed pressure. This either means wasting pressure at lower flow stages or using multiple pressure sensors (switched via a relay).
Alternatively I wonder about just having a constant or staged flow system.
I wonder if this could be done by replacing the pressure switch on the MonoDrive with a flow meter like this (http://www.proteusind.com/800_flow_meter/DS_800_001.pdf).
Since the cost to me of adding a relay and extra pressure switch is less I will probably do that now. But if I was starting from scratch I wonder if using a flow meter in place of the pressure switch would work?