District energy distributing system

A district energy distributing system comprising:

• a geothermal heat source system comprising a geothermal heat source and a feed conduit for a flow of geothermally heated water from the geothermal heat source;
• a district feed conduit wherein the district feed conduit is configured to allow heat transfer fluid of a first temperature to flow there through;
• a district return conduit, wherein the district return conduit is configured to allow heat transfer fluid of a second temperature to flow there through, wherein the second temperature is lower than the first temperature;
• a plurality of local heating systems, each having an inlet connected to the district feed conduit and an outlet connected to the district return conduit, wherein each of the plurality of local heating system is configured to provide hot water and/or comfort heating to a building, wherein each of the local heating systems comprises:
• a thermal energy consumer heat exchanger selectively connected to the district feed conduit via a thermal energy consumer valve for allowing the heat transfer fluid from the district feed conduit to flow into the thermal energy consumer heat exchanger, or via a thermal energy consumer pump for pumping the heat transfer fluid from the district feed conduit into the thermal energy consumer heat exchanger, and connected to the district return conduit for allowing return of the heat transfer fluid from the thermal energy consumer heat exchanger to the district return conduit, wherein the thermal energy consumer heat exchanger is arranged to transfer thermal energy from the heat transfer fluid to surroundings of the thermal energy consumer heat exchanger, such that the heat transfer fluid returned to the district return conduit has a temperature lower than the first temperature or a temperature equal to the second temperature;
• a controller configured to receive a local pressure difference, Δpl, between the district feed conduit and the district return conduit;
• and based on the local pressure difference, selectively control the use of either the thermal energy consumer valve or the thermal energy consumer pump;
• a central heat exchanger connected to the feed conduit of the geothermal heat source system such that an incoming flow of the geothermally heated water is provided to the central heat exchanger, wherein the central heat exchanger is configured to exchange heat from the incoming flow of the geothermally heated water to an outgoing flow of the heat transfer fluid in the district feed conduit, and wherein the central heat exchanger is configured to control a temperature of the outgoing flow of the heat transfer fluid in the district feed conduit to a temperature of 5-30° C.