The primary/secondary chilled water plant loop uses the EnergyPlus Common Pipe Simulation mechanism to represent a chilled water circuit comprising both primary and secondary pumped sub-loops. The primary sub-loop incorporates a single chiller, flow splitter and flow mixer together with a circulating pump. By default, the chiller has a water cooled condenser and connections are included to enable the condenser to be connected up to a condenser loop. The primary sub-loop also includes a scheduled temperature setpoint manager which is set up by default to control the sub-loop outlet temperature at a constant 6°C.
The secondary sub-loop includes a scheduled temperature setpoint manager which is pre-defined to control the sub-loop inlet temperature at a constant 6°C but the schedule defining this temperature can be replaced with any required alternative. The secondary sub-loop also incorporates a flow splitter and flow mixer in order that the loop can be connected to cooling plant components.