.Buildings.Fluid.Movers.BaseClasses.Characteristics.efficiency

Information

This function computes the fan or pump efficiency for given normalized volume flow rate and performance data. The efficiency is

η = s(V̇/rN, d),

where η is the efficiency, rN is the normalized fan speed, is the volume flow rate, and d are performance data for fan or pump efficiency.

Implementation

The function s(·, ·) is a cubic hermite spline. If the data d define a monotone decreasing sequence, then s(·, d) is a monotone decreasing function.

Interface

function efficiency
  extends Modelica.Icons.Function;
  input Buildings.Fluid.Movers.BaseClasses.Characteristics.efficiencyParameters per "Efficiency performance data";
  input Modelica.Units.SI.VolumeFlowRate V_flow "Volumetric flow rate";
  input Real d[:] "Derivatives at support points for spline interpolation";
  input Real r_N(unit = "1") "Relative speed";
  input Real delta "Small value for switching implementation around zero speed";
  output Real eta(unit = "1", final quantity = "Efficiency") "Efficiency";
end efficiency;

Revisions


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