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<< Click to Display Table of Contents >> Pump model from FR as f(Pp) for fixed Heads |
  
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<< Click to Display Table of Contents >> Pump model from FR as f(Pp) for fixed Heads |
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Grids of FlowRate (Power) curves for different Heads is the usual way of specifying the solar centrifugal pumps. These allow to get a very good determination of the Hydraulic/Power behaviour, but don't hold any information about the Voltage/Current characteristics.
Such data are suited only when the pump is coupled to the PV system through a power converter.
If needed, the basic function Ip (Up, Head) requires additional informations. These could be provided either by a set of Ip/Vp points for at least two head values (on which we can adjust curves), or by several parameters: Nominal voltage and Current at a given reference Head, ΔV/ΔI at fixed Head (i.e. dynamic resistance) and ΔI/ΔH at fixed voltage.
When specifying such parameters instead of curves, we assume linear behaviours, which will of course penalise the accuracy of the Ip(Up) characteristics.