.Buildings.DHC.Loads.HotWater.BaseClasses.HeatExchangerPumpController .Buildings.DHC.Loads.HotWater.BaseClasses.HeatExchangerPumpControllerController for heat exchanger mass flow rate.
This controller outputs the set point for the head of the heat exchanger pump
on the heating side. The set point is calculated using a PI controller that tracks
the set point for the leaving domestic hot water temperature,
with a minimum controller output equal to yMin.
By default, yMin=0.3, which corresponds to a mass flow rate
of 10% of the design flow rate.
If the measured domestic hot water flow rate is close to zero, then the set point for the pump is also set to zero in order to stop the pump if there is no domestic hot water flow rate.