A regenerative heat supply and an innovative rainwater management system are being designed for the "ecoSquare" neighbourhood in Bamberg. Michael Richter and Wolfgang Dickhaut are in charge of the project.
The neighbourhood is to be supplied with heating and cooling via a cold local heating ring. At the same time, the local heating ring serves to balance out heating and cooling needs that arise at the same time. The goal is the additional use of two rainwater cisterns with a total capacity of 126 m³ for heating and cooling purposes in the neighbourhood.
For this purpose, an AI-based predictive control technology is being developed. A further goal of the control strategy is a rainwater balance without runoff into the canal and the use of rainwater to irrigate the greenery. In addition, the project is investigating questions regarding the treatment of rainwater and the changed biodiversity, as well as analysing building permit processes. The completion of construction will be followed by monitoring and operational optimisation.
Background Against the background of the political targets of net greenhouse gas neutrality by 2045, there is an increasing demand for renewable energy sources in the building sector. At the same time, advancing climate change is causing increasing phenomena such as heat islands and heavy rainfall events.
The project is an example of how climate protection and climate impact adaptation measures can be combined at neighbourhood level and integrated into building and planning practice in the future.
Involved Bavarian Centre for Applied Energy Research e. V. (project management), Technical University of Dresden, Technical University of Munich, Weihenstephan-Triesdorfeco eco AG University of Applied Sciences, HafenCity Uni Hamburg, ecoSquare Regnitztal GmbH & Co. KG, enisyst GmbH, Fränkische Rohrwerke Gebr. Kirchner GmbH & Co. KG, NATURSTROM AG, optigrün internaional AG
BN - Is the roof of my house or company building suitable for a photovoltaic system or a solar thermal system? This question can now be answered quickly and conveniently online with the help of the new solar roof cadastre of the city of Bonn. In a building-specific map display, a coloured marker indicates whether and to what extent a roof is suitable for energy generation by means of solar power. Step by step, further information, for example on the economic efficiency, can be retrieved via a yield calculator.
The suitability of the roofs of all 129,000 buildings in the city for solar energy generation was recalculated using the latest, improved data. For this purpose, elevation grid data was used, which was determined by the district government of Cologne by means of laser scanning in spring 2016. Compared to the previous version from 2010, the new Bonn solar roof cadastre features, among other things, a fourfold higher resolution and a more differentiated designation of the roof areas.
The suitability of the roof surfaces for electricity generation via photovoltaic systems as well as for domestic water heating and, for the first time, also for supporting building heating via solar thermal collectors was calculated. The calculations also took into account the current changes in the framework conditions with regard to feed-in tariffs and self-consumption of generated solar power.
How the application works
In the city map, the installable system size and many additional data such as yields and savings potentials can be displayed for each building. In a newly developed yield calculator, costs and yields can be calculated and compared by entering additional user-specific information such as electricity consumption or household size. In this way, every owner can quickly gain an overview of the suitability of his or her building for the use of solar energy. Detailed instructions are available at www.bonn.de/...solardachkataster.php.
The City of Bonn points out that the information from the solar roof cadastre is an initial non-binding assessment. Essential prerequisites for a decision to build a system, such as the condition of the roof or the static suitability, can only be clarified by suitable specialist companies or qualified consulting organisations. Information on this can be found on the website of the solar roof register.
Bonn roofs have potential
According to the potential analysis of the solar roof cadastre, 6,800,000 square metres in Bonn are suitable for solar power generation. This corresponds to about the size of 950 football fields. Approximately 800,000 megawatt hours of electricity could be generated on this area. This could cover about 50 percent of the total electricity consumption in Bonn. For solar thermal energy, the result of the potential analysis shows 88,461 buildings in Bonn that could be used for this form of energy generation. This corresponds to about 70 percent of the buildings in Bonn.
It's an attitude to life: without a car, but with a bicycle. When the brakes of my car rusted due to too long a standstill, it was clear: I don't need one any more. What is the point of having a car [...]?
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