.Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.DecouplingMixing .Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.DecouplingMixingThis model represents a cooling system where the configuration Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Decoupling is used in conjunction with Buildings.Fluid.HydronicConfigurations.PassiveNetworks.SingleMixing. The combined configuration serves as the interface between a variable flow primary circuit and a variable flow consumer circuit. The primary circuit has a constant supply temperature. The consumer circuit has a varying supply temperature set point that is reset based on the terminal valve opening, with the most open valve being kept 90% open.
Note the following settings.
con1.dp1_nominal=con.dpBal3_nominal which is used
to size the control valve and the pump of the mixing configuration,
and avoids a reverse flow in the bypass at partial load due to the
opposing differential pressure created by the decoupling
configuration. See
Buildings.Fluid.HydronicConfigurations.PassiveNetworks.Examples.SingleMixingOpenLoop
for further details on that behavior.resT2 that is used to reset the
secondary supply temperature uses y_reset=1 which
yields the design supply temperature at the time when the
controller is enabled. Otherwise there is a significant delay in
satisfying the load, followed by a large overshoot, and the control
loop is hard to tune.The fact that the load seems unmet at partial load (see plot #4) is due to the load model that does not guarantee a linear variation of the load with the input signal in cooling mode, see Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.BaseClasses.Load.