This model allows a specified amount of heat flow rate to be "injected" into a thermal system at a given port. The constant amount of heat flow rate Q_flow is given as a parameter. The heat flows into the component to which the component FixedHeatFlow is connected, if parameter Q_flow is positive.
This model is identical to Modelica.Thermal.HeatTransfer.Sources.FixedHeatFlow,
except that the parameters alpha and
T_ref have been deleted as these can cause division by
zero in some fluid flow models.