This is a model for a water-to-water heat pump where the
capacity and input power are computed based on the equation fit
method. The model can be configured with the parameter
is_rev to represent either a non-reversible heat pump
(heating only) or a reversible heat pump. This model uses Buildings.Fluid.HeatPumps.EquationFitReversible,
which the user may refer to for the modeling assumptions.
Refer to the documentation of the interface class Buildings.Templates.Components.Interfaces.PartialHeatPumpEquationFit for a description of the available control input and output variables.