BBSR study: CO2-neutral in cities and neighbourhoods
Published
International agreements and implementation programmes to limit climate change will take account of the importance of cities in the CO2-reduction, as solutions that are primarily aimed at the national level dominate. Nevertheless, in some countries, national climate protection targets and declarations of intent (Intended Nationally Determined Contributions - INDCs) are already being consistently broken down to regions and cities.
The Holzbaunetzwerk München organized a guided tour through the ecological model settlement in Prinz Eugen Park in Munich on 24.05.2019. In 2009, on the initiative of the Green Party, the City Council of the City of Munich decided to build an ecological model settlement with 600 apartments in timber construction in the new district on the site of the former Prinz Eugen barracks in Bogenhausen. Based on the urban design by GSP Architects with Rainer Schmidt Landscape Architects, eight developers, the municipal housing associations GEWOFAG and GWG München, building communities and building cooperatives have developed timber construction projects ranging from atrium houses to seven-storey residential buildings. Today, all projects are under construction and some will be completed this year.
The Holzbaunetzwerk München could welcome about 400 guests. The architects of the model settlement presented their projects to interested visitors, builders, urban planners, timber construction companies, architects, investors and citizens in two parallel guided tours on 24.05.2019 in the course of a tour through the quarter. The various timber construction methods, from pure timber construction to hybrid construction methods with reinforced concrete staircases to reinforced concrete skeleton construction with timber facades, were vividly explained using the projects.
Presented were the projects of the building cooperative WOGENO with the Quartierszentrale by Mr. Florian Lünstedt from the office Atelier 5 Architekten Bern, the GEWOFAG by Jakub Pakula and Eduard Fischer, Pakula & Fischer Architekten Stuttgart, the GWG München by Stefan Rapp, Rapp Architekten Ulm, the building community Team3 by Architekturwerkstatt Vallentin München Dorfen, the building community München GbR by Sibylle Hüther, H2R and PlanZ Architekten from Munich, the Baugemeinschaft Gemeinsam Größer II by Markus Borst, agmm Architekten+Stadtplaner Munich with Hable Architekten, the Baugenossenschaft Bürgerbauverein München eG by Markus Lager, Kaden + Lager Architekten Berlin and the Baugemeinschaft Der kleine Prinz by Ulf Rössler, dressler mayerhofer rössler architekten und stadtplaner GmbH Munich.
Afterwards, at 6 p.m., a panel discussion with the city councillors Ms. Heide Rieke (SPD), Mr. Herbert Danner (Die Grünen), Ms. Ulrike Klar, (City Director, Department of Urban Planning of the City of Munich) and Ms. Gerda Peter (Managing Director of GWG Munich) on the future of timber construction in Munich rounded off the event. It was discussed how the path taken can become a model for further new building areas, what lessons can be learned from the Ecological Model Settlement and how a promotion of timber construction can be designed for the future planning areas of the Bayerkaserne, the urban extensions in the east and north and the redevelopment area of Neuperlach. To this end, the Holzbaunetzwerk München wants to launch the Holzbaustadt München 2030 initiative with at least 2030 residential units in timber construction. How it works could be seen in the Prinz Eugenpark on 24.05.2019.
The Holzbaunetzwerk München was founded in 2018 by Andreas Lerge (Wood Real Estate GmbH) Thomas Kapfer Architekt and Ulf Rössler Architekt (dressler mayerhofer rössler architekten und stadtplaner GmbH). The Holzbaunetzwerk wants to work to connect the stakeholders from politics, administration, planning and business, to engage in the further promotion of timber construction in Munich and to initiate the vision of the timber construction city Munich 2030.
The renovation project "Efficiency House Plus in Old Buildings" shows how two dilapidated rows of houses from the 1930s can be brought up to plus-energy standards - and in some cases that good architecture can be created in the process.
Location: Pfuhler Straße 4-8 and 10-14, D-89231 Neu-Ulm Architects: Werner Sobek Stuttgart and o5 architekten bda - raab hafke lang Builder: NUWOG housing company of the city of Neu-Ulm
Further information: DETAIL-Article "Double experiment: Two residential building renovations in Neu-Ulm." by Jakob Schoof, published online on
In Troisdorf, North Rhine-Westphalia, the largest tenant electricity project in Germany is currently running with subsidised funding from the so-called tenant electricity surcharge under the Renewable Energy Sources Act (EEG). The project, which was supported by EnergyAgency.NRW following an initial consultation, supplies 24 social housing apartments in three multi-storey buildings with a total of 75 residents with electricity. For this purpose, all roof surfaces were covered with photovoltaic modules with a total output of 86.9 kWp. The PV system is completed by six Powerwall 2 battery storage units from Tesla. "The tenants have committed 100 per cent to the project. In addition, the PV electricity, insofar as it is not consumed by the water-to-water heat pump or the tenants, is first stored in electricity storage units. This works so efficiently that we already reached an average self-sufficiency level of 83 percent in May. On isolated days and nights, even 98 percent," explains Frank Scholzen from Scholzen Immobilien, the company that owns the properties.
In rental electricity projects, electricity is generated in a rented property - by PV and/or combined heat and power (CHP) units. This direct electricity is often sold by the operator of the plant to the local energy supplier or - as in Troisdorf - by the landlord to the tenants. "The electricity offered to the tenants is cheaper than electricity from the grid. The advantage for the system operator is an additional income opportunity, as well as an ecologically sustainable electricity supply," explains Wilhelm Schröder from EnergyAgency.NRW, who accompanied the project in an advisory capacity.
However, the three buildings of Scholzen Immobilien are not only characterised by an innovative power supply, Troisdorf is also future-proof in the area of heat: The heating system consists of two water-water heat pumps with a combined thermal output of 76 kW. The well depth is only 14 metres - thanks to the high groundwater level not far from the Rhine. Scholzen: "The smart meters supplied by the Aachen-based company Discovergy enable continuous monitoring of the energy flows between the PV system, heat pump, energy storage and main meter."
In this complex and demanding project, many parties have to be coordinated. In Troisdorf, the following were involved:
Priogo AG from Zülpich (specialist partner for photovoltaics, heating technology, electromobility)
Discovergy GmbH from Aachen (smart metering systems)
Stadtwerke Troisdorf GmbH (distribution system operator)
Westfalen Group from Münster (residual electricity supplier)
Vaillant Group from Remscheid (manufacturer of the heat pumps) and Geotechnik GmbH from Wesseling (well drilling company)
In the meantime, the company Scholzen Immobilien is planning another tenant power project in Düsseldorf.
By the end of April 2018, a total of 19 tenant power projects subsidised under the EEG with an installed capacity of more than 350 kWp had been realised in NRW. The EnergyAgency.NRW has published a brochure entitled "Mieterstrom - kurz erklärt" (Tenant Electricity - Explained in Brief), which presents in detail the technical and legal aspects that need to be considered when implementing projects.
To ensure that significantly more houses in Hamburg are greened with plants on roofs and facades, the environmental authority is making €500,000 in funding available from 1 June. A maximum of € 100,000 and up to 40 % of the costs, applicants can receive in future in grants. Applications can be made from construction costs of €1,000. Funding will be provided for ground and wall-based greening of new and existing buildings, preparatory work, climbing aids, plants, planting measures, irrigation systems, completion maintenance and the ancillary costs for professional planning and supervision.
The new façade greening grant programme complements the 'On the roofs - ready - green!' initiative, which has been in place since 2015 and with which Hamburg has been advertising and promoting comprehensive greening of roof surfaces for some time. The greening of facades and roofs are an important pillar in Hamburg's climate change adaptation strategy. Summer temperatures can be alleviated by green facades and the humidity in the populated area can be increased.
Green walls" handbook of the Hamburg environmental authority
In addition to the funding programme, the Environment Agency has published the "Green Walls Handbook", which provides support for the realisation of planned projects. www.hamburg.de/gruendach
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