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News – What`s happening in energy research

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Puls G—a mixed-use building with gross floor area of 13,000 m²—forms the heart of Geretsried's “Neue Mitte” district. Construction work began here in the summer of 2017.
© Krämmel Wohn- und Gewerbebau GmbH
Urban district energy concept
20.06.2018

The findings gained by realising the energy-plus housing estate “Ludmilla-Wohnpark” in Landshut were used to develop the district in Geretsried, and were also applied to research work for the +EQ-NET project.
© Ludmilla Wohnbau GmbH

Electrical network neutrality means maximising own coverage and use and therefore the reduction of surplus infeed and power purchase.
© Munich University of Applied Sciences

Planned technical components for the network-neutral housing estate
© Munich University of Applied Sciences

Network-neutral energy-plus district Geretsried

Researchers at Munich University of Applied Sciences and Dresden University of Technology have developed an innovative energy concept for a plus-energy district, which is to be implemented in the "Neue Mitte" of Geretsried (Bavaria) by the end of 2019. The concept combines the use of different energy technologies with the goal of electrical grid neutrality, i.e. the highest possible self-coverage of electricity requirements and own use of the electricity generated.

To date, about a fifth has been achieved: Following the demolition of a building section from the 1960s in Geretsried, construction work began in summer 2017 for the network-neutral, so-called energy⊕ district. The Puls G building is the first milestone in the construction of a new city centre, which is to be completed within five years.

In order to do justice to the development from “pure energy consumer” to “energy stakeholder” and to extend the energy perspective from individual buildings towards housing estates and districts, the term “energy⊕” was introduced as part of a research project at the Munich University of Applied Sciences in 2015. This is the approach now being implemented in the Geretsried project (+EQ-NET).

Energy is generated here using a combination of heat pump and ground collector under the building, photovoltaic system, cogeneration plant, energy storage system for heat, cooling and electrical power as well as a low-temperature distribution network. There are also hybrid domestic hot water heaters in the apartments. Generation and consumption are decoupled with the aid of heat, cold and electricity storage facilities. Depending on demand and availability, the heat generator is selected according to economic and ecological criteria, taking seasonal fluctuations into account. The energy concept also offers real added value for the residents. The combination of underfloor heating and controlled living space ventilation results in a high level of living comfort.

The energy concept was developed as part of the +EQ-NET research project. The researchers applied the experience gathered in a predecessor project, the development of an energy-plus housing estate in Landshut. Completed in 2015, Ludmilla Wohnpark with 180 residential units was built on an industrial brownfield site. Close monitoring and the subsequent optimisation of the building operation significantly reduced the energy consumption.

This is not the only reason why analyses of possible technical concept solutions were already being carried out during the planning phase of the energy⊕ district in Geretsried. A seasonal control concept shall not only control the components of the energy concept in a grid-friendly manner wherever possible but also keep the share of auxiliary energy as low as possible. Parallel to the structural implementation, a monitoring concept is currently being developed which will help evaluate in detail the energy behaviour of the network-neutral district and its residents. The measurement values are to be used for the development of an online tool for operation diagnostics and the optimisation of buildings, and will be visualised with the “O-ViVE” tool.

Planning and conception are funded by the German Federal Ministry for Economic Affairs and Energy (BMWi) within the framework of the research initiative "Energy-Efficient City" (EnEff:Stadt). The concept will be implemented by EREA Projekt GmbH & Co. KG.

(fr)

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Addresses

Project coordination
Hochschule München, CENERGIE

Links

Utilising decentralised electricity in the district
Presentation of the project on the ENERGIEWENDEBAUEN website

ENERGIEWENDEBAUEN
Projects, reports, news and analysis from the research initiative ENERGIEWENDEBAUEN