Model for an ideal heater or cooler with prescribed heat flow rate to the medium.
This model adds heat in the amount of
Q_flow = u Q_flow_nominal to the medium.
The input signal
u and the nominal heat flow rate
can be positive or negative. A positive value of
heating, and negative means cooling.
The outlet conditions at
port_a are not affected by this model,
other than for a possible pressure difference due to flow friction.
Optionally, this model can have a flow resistance.
dp_nominal = 0 to disable the flow friction calculation.
For a model that uses as an input the fluid temperature leaving at
This model does not affect the humidity of the air. Therefore, if used to cool air below the dew point temperature, the water mass fraction will not change.
The model has been validated against the analytical solution in the example Buildings.Fluid.HeatExchangers.Validation.HeaterCooler_u.
preHea(final alpha=0)as this allows to simplify the system of equations.
extendsstatement. This is for #349.
prescribedHeatFlowRate=true. This is for issue #412.
Q_flowso that it has the same output ports as Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet.