MultiHeat

The goal of MultiHeat is the economic optimization of a grid-connected, multivalent heat supply system based on renewable energies in combination with a central seasonal heat store.

An extensive simulation study is being conducted to investigate, in particular, how locally available renewable energy sources such as solar energy and wind energy can be used in combination with seasonal heat storage to provide climate-neutral heat supply to existing villages with approximately 2,000 inhabitants and predominantly residential development. The investigations are being carried out using the town or district of “Müsen” as an example. Müsen is a district of the town of Hilchenbach in the federal state of North Rhine-Westphalia and is located in the Siegerland region in Germany, approximately 20 km north of Siegen. Müsen has a population of around 2,300 inhabitants living in approximately 800 buildings with an annual heating requirement of around 16,000 MWh.

In the MultiHeat project, various seasonal heat storage technologies are being considered. It is therefore necessary to determine the suitability of the ground for the implementation of a geothermal heat store. As no meaningful information or maps on the geological composition of the upper layers of the earth, i.e., up to a depth of approx. 200 m, are available for the Siegerland region, a test drilling and a thermal response test (TRT) are required. The TRT determines the effective thermal conductivity of the soil, which serves as the basis for dimensioning of the geothermal heat store.

01/2026 – 09/2026

Bürgerenergiegenossenschaft Müsen

https://dorfwaerme-muesen.de/

The MultiHeat project is funded by the German Federal Ministry for Economic Affairs and Energy (BMWE) as a microproject under funding code 03ENM6005 by the project management agency Jülich (PTJ) on the basis of a resolution by the German Bundestag. he authors gratefully acknowledge this support and carry the full responsibility for the content of this publication.