Sol4City

The supply concepts in the joint Sol4City project are based on an anergy network for heat pumps which allows, in combination with a low-temperature latent storage, an efficient use of regenerative, thermal energy sources. Anergy networks are heat supply networks that are operated at a relatively low temperature level in the range of approx. -5 °C to +20 °C and primarily serve as heat sources for decentralized heat pumps.

The key components of the total heat supply systems to be newly developed both for new buildings and for existing buildings are the anergy network, latent heat storage, heat pump and technologies for the energetic use of solar radiation and ambient heat. Sol4City will focus on the combined use of already available technologies and components to be newly developed especially in the context of the overall system, such as highly efficient, vacuum heat-insulated hot-water storage tanks and an adaptive and predictive system control. This control system operates and optimizes the supply of both thermal and electrical energy to the building or district. Furthermore, a concept for the realization of standardized latent storage tanks with volumes between 100 and 2000 m³ will be developed.

Three of the newly developed total energy supply systems will be implemented in real plants and analyzed and optimized in detail using measurement technology over a period of approx. 1.5 years.

Sol4City is a joint research project of partners from Germany and Austria, each with national funding.

12/2019 – 11/2023

Germany:

• Institute for Building Energetics, Thermotechnology and Energy Storage (IGTE) at the University of Stuttgart
• Viessmann Werke GmbH & CO KG

Austria:

• AEE Institute for Sustainable Technologies, several industrial companies

W. Juschka; S. Lott; H. Drück; B. Hafner; R. Dott; J. Schaumann: "Bestimmung des Beladungsgrades eines Eisspeichers mittels detaillierter energetischer Bilanzierung". Symposium Solarthermie und innovative Wärmesysteme, 09.-11.05.2023, Bad Staffelstein

W. Juschka; S. Lott; H. Drück; B. Hafner; R. Dott; J. Schaumann: "Entwicklung einer Sensorik zur Detektion des Beladungszustandes von Eisspeichern". Symposium Solarthermie und innovative Wärmesysteme, 03.-05.05.2022, Bad Staffelstein

S. Lott; W. Juschka; H. Drück; B. Hafner; S. Hensel; D. Westermann: "Development of a sensor for the detection of the charge status of ice stores". Enerstock Conference, 09.-11.06.2021, Online-Konferenz

S. Fischer; S. Lott; H. Drück; B. Hafner: "Quasi-dynamische Vermessung und numerische Simulation eines solarthermischen Luft-Sole-Wärmeübertragers". Symposium Solarthermie und innovative Wärmesysteme, 27.-29.04.2021, Online-Konferenz

The Sol4City project (Development of integrated solar supply concepts for climate-neutral buildings for the "city of the future”) is funded by the Federal Ministry for Economic Affairs and Climate Action (BMWK) based on a decision of the German Bundestag via Project Management Jülich (PtJ) under grant numbers 03ETW019 A/B. The authors gratefully acknowledge this support and carry the full responsibility for the content of this publication.