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Renewable local district heating systems – Efficiency through synergies

The energy supply from the local district heating system offers the residents and trades people of an area a high degree of comfort and enhances an area continuously. Geo-En designs, plans and realises the local district heating system with renewable energy. The local district heating systems connect the large highly-efficient energy systems with decentralised and scattered customers.

The best example for this is the local cold district heating system established by Geo-En (refer to the system diagramxxx): it is exceptionally energy efficient in order to supply heterogeneous structured areas which require heating and cooling simultaneously. The residents are connected through a network in which the geothermally-heated water (approx. 10 °C) circulates. The heat recipients are connected through heat pumps to the network. Cold energy is directly obtained from the network and passed on through the heat exchanger. A geothermal energy system saves heat in the network in winter and obtains heat from the network in summer.

Your benefits:

  • Renewable district cooling at virtually no cost: The network is used to supply cold energy and distributes geothermal cold energy to residents. Cooling systems are replaced and energy costs are reduced.
  • Synergies from warm and cold energy usage: Heat and cold energy extraction compensate for one another, thus saving energy. If in summer domestic hot water is generated, the heat pumps cool the network. If trades people use the network for cooling at the time same, they help warm it up.
  • High cost-efficiency: The network is used to balance the requirement peaks -the total performance and total investments fall lower than those from using decentralised solutions.
  • Solar heat can increase efficiency and climate protection even more effectively: Unlike the current district heating, the temperature in the network is so low that the excess solar heat can be stored.

However, according to the user profile and the location, other network concepts may also be beneficial; for example, medium-warm district heating networks (40° - 65°C) from which energy can be stored directly in floor heating or fresh water stations. We observe every project individually and plan the optimal energy solution of your district.

District  heating system
In the Berlin-Zehlendorf residential area