.Buildings.DHC.Plants.Combined.Subsystems.CoolingTowerGroup .Buildings.DHC.Plants.Combined.Subsystems.CoolingTowerGroupThis model represents a set of identical cooling towers that are piped in parallel. No actuated isolation valves are included.
The following input and output points are available.
y1:
DO signal dedicated to each unit, with a dimensionality of one
y:
AO signal common to all units, with a dimensionality of zero
TConWatSup:
AI signal common to all units, with a dimensionality of zero
In a parallel arrangement, all operating units have the same operating point. This allows modeling the heat transfer from outdoor air to condenser water with a single instance of Buildings.Fluid.HeatExchangers.CoolingTowers.Merkel. Hydronics are resolved with mass flow rate multiplier components. Note that the elevation head of open-circuit cooling towers is not modeled, which is an inherent limitation of the cooling tower component model.
The fan cycling On and Off is implicitly modeled in the cooling tower component which uses a low limit of the control signal to switch to a free convection regime at zero fan power.