.Buildings.DHC.ETS.Combined.BaseClasses.PartialParallel

Information

This is a base model providing the hydronic configuration for an energy transfer station as described in the schematics below. It is typically used to integrate systems providing both heating water and chilled water, such as heat recovery chillers. Furthermore, it can be connected to an adjustable number (nSouAmb) of systems serving as ambient sources (including the district heat exchanger).

• The connection to the district loop is realized with a heat exchanger, according to the operating principles described in Buildings.DHC.ETS.Combined.Subsystems.HeatExchanger.
• The connection of the heating water and chilled water production systems to the systems serving as ambient sources is realized in parallel.
• A replaceable partial class is used to represent a supervisory controller, which must be replaced by a control block providing at least the control signals listed in Buildings.DHC.ETS.Combined.Controls.BaseClasses.PartialSupervisory.

Models that extend this base class must

• specify the number of systems serving as ambient sources nSouAmb, the number of heating water production systems nSysHea, and the number of chilled water production systems nSysCoo (by default nSysCoo=nSysHea which corresponds to a configuration where both productions are ensured by the same system, such as a heat recovery chiller),
• modify the parameter binding with the nominal mass flow rate of each connection to each collector/distributor model, namely the parameter mCon_flow_nominal (array) of the components colChiWat, colHeaWat and colAmbWat. The connection index 1 for the components colChiWat and colHeaWat is reserved for the connection with the ambient source circuit. It increases with the distance from the buffer tank. The connection index 1 for the component colAmbWat is reserved for the connection with the district heat exchanger. Note that the order of the connections has no impact on the flow distribution as the connections are in parallel.

Note that the model includes a pressure boundary condition which is shared between the hot water and chilled water circuits, the two circuits being hydronically connected.

Revisions

• July 14, 2021, by Antoine Gautier:
  Added pressure boundary condition.
  This is for issue #2561.
• December 21, 2020, by Antoine Gautier:
  Added outputs for distributed energy flow rate.
• July 31, 2020, by Antoine Gautier:
  First implementation.