Aachen, March 2020
A lot of daylight in the eco-quarter
On a conversion site in Munich-Bogenhausen, townhouses and atrium blocks were built in timber construction – in passive house standard and with an innovative tenant flow concept. The 55 apartments contained therein thus comply with the principles of “conceptual housing construction”, with which the City of Munich promotes high-quality and affordable living space. The latest generation of heat insulation glass from SAINT-GOBAIN Glas was used for the glazing. Thanks to the highly efficient, innovative ECLAZ coating, maximum daylight yield is ensured despite triple glazing.
A new city quarter, the Prinz-Eugen-Park, is being created on the 30-hectare site of the old Prinz-Eugen barracks in the east of Munich. Planned 1,800 apartments for 4,000 people will be spread across various types of buildings, from atrium houses to seven-storey apartment blocks. Among them are 570 apartments, which form the largest contiguous timber construction settlement in Germany. The city of Munich wants to set new standards for climate protection and sustainable urban development with the timber construction method and has created its own support program for this purpose. The ecological model settlement consists of eight timber construction projects and is being realized by the municipal housing associations Gewofag and GWG as well as various building cooperatives and building groups.
Passive house standard for the Munich mix
In this quarter, the Munich architecture and project development office NEST built a residential complex in passive house standard, known as P#01 in planning jargon. The 55 rental apartments are spread over two townhouses and four atrium house blocks and were planned according to the criteria of the “Konzeptioneller Wohnungsbau” (KMB) of the City of Munich. With this, the city wants to create affordable, high-quality rental housing and promote the so-called “Munich mix”, i.e. the broad spread of different income groups in the quarter. Each of the 1- to 4-room apartments has a small patio, a balcony or a roof terrace with a view of the park. On the ground floor of the townhouse “West” there is a common room which is available to all residents of the complex for celebrations and other activities. The atrium houses were built as a pure timber construction and the two townhouses as a hybrid construction with a massive supporting structure and non-load-bearing exterior walls in timber construction.
The high quality standard of the complex is reflected in the competent planning of the compact structures by the architects and the professional execution on site as well as in the high-quality equipment of the family-friendly and partly barrier-free apartments. Of great interest to the tenants is the sophisticated energy concept, which not only serves to protect the climate, but also offers the residents financial incentives for climate- and energy-conscious living. The facility meets the very highest energy building standard: the “KfW Efficiency House 40+” standard. The residential complex even meets the high requirements of the passive house standard, which guarantees an extremely low annual heating requirement of only 15 kilowatt hours per square metre and year (kWh/m²a) and thus the entry A++ for heating in the energy certificate. External sun protection, ventilation with heat recovery and rainwater utilisation for the toilets are further advantages that help to reduce the ecological footprint of the residents and their additional costs.
Energy concept with tenant electricity
The electricity for the 55 households is produced from renewable energies themselves: In P#01, contracting partner Polarstern Energie implemented one of the first projects in Germany with a large-scale battery storage facility and a tenant power model. A photovoltaic system on the roofs of the residential complex with an average output of 79 kilowatt peak (kWp) generates around 80,000 kilowatt hours of electricity per year (kWh/a). In order to ensure an efficient and fair supply of electricity to all tenants, the amount of electricity generated on the individual buildings is combined in one house connection. Unused electricity is temporarily stored in a large solar power storage unit and stored for later consumption. Together, the PV system and storage tank cover around 40 percent of the tenants’ total electricity requirements. In total, 88 percent of the electricity generated by the tenants themselves can be used; without the storage facility, this figure would be just under half. If more electricity is required than is provided by the PV system and the storage facility, the households are supplied with green electricity from the grid by the electricity provider, which is also generated from 100 percent renewable energy sources.
The innovative energy concept is completed by a sustainable mobility concept based on electric mobility: charging stations for electric vehicles are available in the underground car park for all tenants. They are assigned to the respective apartment meters and are thus billed directly to the users. The concept is embedded in a mobility concept jointly developed by all the players in Prinz-Eugen-Park. This includes car-sharing services, bicycle parking spaces, and the rental of cargo bikes, trailers and pedelecs. The planners from NEST were also involved in the cross-quarter local mobility infrastructure planning.
Daylight in the energy concept
For the owners and architects of P#01, the good daylight supply of the apartments was an important concern during the planning phase. A good supply of daylight via the facades and windows is essential for the well-being and health of the residents, for the deep illumination of the rooms and for the energy balance of the buildings, because it reduces the time in which artificial light has to be switched on. For these three reasons, the planners took great care in the choice of passive house windows for the residential complex. Triple-glazed windows are mandatory for the passive house standard envisaged, because the planned ENERsign® primus passive house windows contribute significantly to low heat losses with their high thermal insulation values (Ug-value = 0.6 W/m²K). However, this does pose a problem: the reflective coatings on the three layers of glass allow for very good thermal insulation, but they also result in a greatly reduced light transmission, because the vaporized reflective layer can absorb up to 40 percent of daylight. For the P#01 project, the planners opted for the latest generation of thermal insulation glass from SAINT-GOBAIN. With CLIMATOP ECLAZ thermal insulation glass, energy-efficient triple glazing with the high daylight transmission values of double glazing could be realised and the goal of passive house standard achieved.
This is because the innovative CLIMATOP ECLAZ® heat insulation glass with passive house certificate combines the best insulation properties with the highest light transmission, transparency and colour brilliance. The more uniform light spectrum compared to conventional insulating glass ensures fresh colours indoors: the rooms appear bright and friendly, walls and curtains appear whiter. Thanks to a light transmission of 83%, the new ECLAZ glazing allows noticeably more daylight into the house. At the heart of this groundbreaking new development is a high-performance low-E coating technology that efficiently reflects interior heat inwards while at the same time having a very high transparency. This means that the highly insulating triple glazing achieves approximately the same high light transmission values as double glazing. With an insulating glass structure 4|18|4|18|4 mm, a light transmission of 77 % is achieved at a Ug-value of 0.5 watts per square metre and Kelvin (W/m²K). Compared to similar insulating glass, up to 11 percent more daylight enters the room; sunlight penetrates up to 10 percent deeper into the room.
Quality in residential construction requires teamwork
Planning sophisticated buildings such as the P#01 with good energy concepts requires close cooperation between architects and all other parties involved in construction. Only in this way can the criteria be reliably met and renewable resources be used sensibly. In the case of the Passive House settlement in Prinz-Eugen-Park, this applies in particular to the good cooperation between architects, specialist planners and partners from industry, such as the architectural consultants from SAINT-GOBAIN Glass, with whom it was possible to find the best solution for the project.
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- Object: Passive House settlement NEST Eco+
- Building owner: Private owner
- Location: Prinz- Eugen-Park – WA 3 West, Ruth-Drexel-Straße, 81927 Munich
- Architect: NEST EcoArchitecture, Michael Joachim, Sonja Joachim GbR, Baumkirchner Str. 4, 81673 Munich, Germany, www.nest-ecoarchitektur.de
- Subsidised apartments: 20 percent, approx. 12 – 15 apartments
- Apartment mix: 1- to 4-room apartments
- tenant electricity concept: Polarstern, www.polarstern-energie.de
- Glass production: Saint-Gobain Building Glass Europe
- Glass: CLIMATOP ECLAZ thermal insulation glass, triple insulating glazing
- Window: ENERsign® GmbH
- Completion: 2018 / 2019
Press text and photo are available for download under the following link: http://download.proesler.com/sg_Muenchen.zip
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