District heating network - Chemnitz - Substation Z60 becomes an energy center


The idea: Local solar heat for direct use in urban apartment buildings

A large district heating network with several secondary networks has been implemented by Wagner Solar in the city of Chemnitz. The energy supplier „eins“ " took the opportunity to revolutionize the heat supply during the renovation of the inner city district of Brühl. In cooperation with the city administration and supported by the TU-Chemnitz, Chemnitz is now one of the pilot projects of energetic urban regeneration. New district heating pipes were laid and a 2200 m² solar thermal system from Wagner Solar was installed in combination with a CHP unit. Our WGK collectors, which were specially designed for large installations, were used. The collector system is designed as a free-standing system. Sigma ram-profiles or Steel Roots foundations have been used for windproof installation, this allows an individual height adjustment. The collector connectors reliably compensate for the length expansion of the collector cables pre-assembled in the collectors. For example, long collector rows of up to 120 m² can be directly connected to one another without any additional piping. The Z90 energy center was located at the location, directly at the residential quarter, which is also operated centrally by a cooling supply. Currently, 168 buildings are being provided with about 1,600 households. The heating load is 9 MW. In total construction, the heating load will rise to 15 MW.

Create the best conditions

In order to be able to utilize solar heat optimally, the temperatures must match. As part of the redevelopment of the whole district with TU-Campus and the Brühl Boulevard, the infrastructure ( gas & water supply as well as the communication) has also been modernized. The energetic optimization of the buildings and of the distribution now allows flow temperatures of 70 ° C and return temperatures of 35 - 40 ° C separated by heat exchanger from the district heating network. The special feature here is that the secondary network is used without system separation from the collector field to the radiator. Higher yields due to lower system temperatures and reduced system costs due to simpler design overcompensate the active frost protection by heating the collector field with low-temperature heat in the few frost pits. The facility was completed in August 2016. A successful example for the successful integration of large solar thermal systems in urban areas.  

Z9 echt   verschaltet zu langen Reihen

  • 2200 m² solar thermal system
  • Storage: 1000 m³ for solar thermal and cogeneration
  • Fundation: Steel Roots

  • Connected to long rows
  • Flexible height adjustment

  • In the first 30 days of operation the system already produced more than 100,000 kWh solar energy
  • the annual heat demand of about 20 households.
  • Peak output of 700 W / m² in September
  • Savings by the solar system of about 100,000 liters of oil per year
  • Reduction of of about 313 t CO2 Emission
  • Provision of approx. 880 MWh through the solar system



You have big plans? We also plan your large scale solar project!

Your contact for your projects:


Solar heat

Ralf Orths
Tel.: +49 6421 8007 350
Fax: +49 6421 8007 450

Solar Power

Henning Schmitt
Tel.: +49 6421 8007 743
Fax: +49 6421 8007 450

Curious? Examples of our large projects can be found at:Projects



A solar installation from Wagner Solar is just right for you?

Request a quotation

Would you like to find out more about our solar installations?

Request brochures