Brief Description
The foundation of the supply concepts within the "Sol4City" project was a cold district heating network or anergy network or heat pumps, which, in combination with a low-temperature latent heat store, allowed for efficient utilization of renewable thermal energy sources. Anergy networks are heat supply networks operated at relatively low temperature levels, approximately from –5 °C to +20 °C, primarily serving as heat sources for decentralized heat pumps.
The central components of the overall heating supply systems, which were to be newly developed for both new constructions and existing buildings, included the anergy network, the latent heat store, heat pump, technologies for harnessing solar radiation and ambient heat. The focus of "Sol4City" was on the combined use of already available technologies and components to be specifically developed within the context of the overall system, such as highly efficient, vacuum-insulated hot water storage tanks and an adaptive, predictive system control. This control system managed and optimized the building or district's thermal and electrical energy supply. Additionally, within the project a concept for implementing standardized latent storage tanks was developed with volumes between 100 and 2000 m³.
Three of the newly developed overall energy supply systems were implemented in real installations within the project and were thoroughly measured, analyzed, and optimized over approximately 1.5 years.
The "Sol4City" initiative was carried out jointly by German and Austrian partners, with respective funding provided nationally.
Duration
12/2019 – 02/2024
Project Partners
Germany:
- Institute for Building Energetics, Thermotechnology and Energy Storage (IGTE) at the University of Stuttgart
- Viessmann Werke GmbH & Co KG
Austria:
- AAE Intec and various industrial companies
Acknowledgment
The Sol4City project was funded by the Federal Ministry for Economic Affairs and Energy (BMWi), based on a resolution of the German Bundestag, through the project sponsor Jülich (PTJ) under funding code 03ETW019A/B. The authors thank for the support and assume responsibility for the content of this publication.
Abschlussbericht
Dr.-Ing. Harald Drück
Research Coordinator and Team Lead