.Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.InjectionTwoWayConstantReturn .Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.InjectionTwoWayConstantReturnThis model is almost similar to Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.InjectionTwoWayConstant except that a cooling system is represented, and the valve control logic is based on the consumer return temperature. This model serves mostly as a reference to illustrate the shortcomings of this control option when used with a variable consumer circuit such as in Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.InjectionTwoWayVariableReturn.
In this model the load is not met at partial load due to the sizing of the terminal units that does not take into account the load diversity as required when controlling for the return temperature (see the explanation provided in Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.InjectionTwoWayConstant). In addition, the load model does not guarantee a linear variation of the load with the input signal in cooling mode, see Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.BaseClasses.Load. This amplifies the effect of the unmet load at partial load.