.DisHeatLib.Substations.SubstationParallel

Information

This is a model for a district heating substation with parallel domestic hot water and space heating stations. This substation contains a base station for domestic hot water (DHW) preparation and a base station for space heating (SH) together with an optional bypass valve.

Care must be taken when chosing the nominal values for differential presure, mass flow and/or heat load, as different issues might occure:

• In cases where the differential pressure is below its nominal value, the nominal mass flow is not reached. Thus, in times of high heat demand, not enough heat might be delivered to the individual stations.
• For differential pressure above the nominal value, the mass flow through the valve might be quite high. This, can lead to a flicker in the valve controllers in the base stations.
• Nominal values of mass flow should be chosen such that the heat load can be satisfied (maybe even with supply and return temperatures away from their nominal value).
• Nominal heat load should not be set too strict, as nominal values for supply and return temperature are used to derive nominal mass flow values.

Revisions

• Feburary 27, 2019, by Benedikt Leitner:
  Implementation and added User's guide.