- Building Type : Collective housing > 50m
- Construction Year : 2011
- Delivery year : 2017
- Address 1 - street : Seestraße 416 8038 ZURICH-WOLLISHOFEN, Switzerland
- Climate zone : [Dfb] Humid Continental Mild Summer, Wet All Year
- Net Floor Area : 814 m2
- Construction/refurbishment cost : 5 900 000 €
- Cost/m2 : 7248.16 €/m2
Primary energy need :
(Calculation method : Other )
On the shores of Lake Zurich, between the busy Seestrasse and the railway embankment, a new residential building called House Solaris was built, offering space for ten units. Despite the ringing name, it is not clear from the outside that the house is in fact a solar house. The brown all-over cover made of ribbed cast glass, even at second glance, does not yet show that solar cells are built into the glass. In total, 1,300 PV modules from ertex solar, an Austrian PV manufacturer, are installed on the entire building envelope.
The multi-story residential building at Seestrasse 416 in Zurich not only looks urban, but also elegant and offers space for ten apartments despite its slim structure. This is being made possible by the well-designed structure. The base area resembles a slightly asymmetrical hourglass, creating a building that is bent horizontally and vertically. Due to the waisted shape of the building, all apartments have five expositions, which lead to different floor plans of the apartments, all-day sunshine, diverse views including a view of Lake Zurich and two noise-averted façades for ventilation. A shared electric car is also available to the residents.
During the planning phase, the architects from huggenbergerfries were of the opinion that the building does not have to look like a solar house at first glance. In the end, they really succeeded in doing this at Solaris. The outer shell consists of a structured, brown-colored cast glass, the color of which was developed together with the Lucerne University of Applied Sciences and Arts after months of development. Different light situations and viewing angles make the house appear dark red through violet to shiny silver in a wide range of colors.
In total, the building envelope is equipped with 1,300 photovoltaic modules from ertex solar, that way a total of approximately 31,832 kWh of electricity is generated annually. This allows the house to supply itself entirely and to produce even more. The Solaris house at Seestraße 416 is not only a solar house but has several positive aspects regarding the environment. For example, the house is not heated with an ordinary electrically operated heat pump, but with biogas and is therefore 100% CO2 free.
The excess electricity generated is stored in a 10 kW battery, as well as in the battery of the house’s own electric car. If there is still electricity generated by the company, it is fed into the public grid. The wooden floors used in the entrance area, the corridors and stairs were already installed in the previous building, so they were recycled. The two trees that had to be cut down for the construction of the building were also used inside the house as supports and visual highlights in the rooms.
See more details about this projecthttps://hbf.ch/projekte/stadthaus-seestrasse-zuerich
huggenbergerfries © Fotograf Beat Bühler
DeveloperHochschule Luzern CC Envelopes & Solar Energy +41 41 349 34 79 Research partner
CompanySunDesign GmbH +41 44 390 14 58 Photovoltaics engineering
CompanySun Technics Fabrisolar +41 44 914 28 80 Photovoltaics integration
CompanyGasser Fassadentechnik AG +41 71 282 40 00 Facade planning
Manufacturerertex solartechnik GmbH +43 7472 28260 610 Photovoltaics manufacturer
Construction companyScherrer Metec AG 044 208 90 60 building envelope
CompanySynaxis AG +41 44 316 67 77 Civil engineer
CompanyPfenninger & Partner GmbH +41(0)44 480 11 88 Engineer
CompanyRuckstuhl Elektrotech AG +41 44 710 54 55 Electrical engineer
CompanyGuyer Wärme und Wasser info[a]guyer.ch Heating engineer
CompanyMeier-Kopp AG 044 439 99 69 Ventilation engineer
CompanySada AG 044 297 97 97 Plumbing engineer
CompanyKopitsis Bauphysik AG +41 (0)56 201 44 44 Building physics
CompanyPöyry Schweiz AG info.ch[a]afry.com Field surveyor
Owner approach of sustainability
The architects from huggenbergerfries were intentionally planning to build a glasshouse, then they realized that there was the option of integrating energy production. In Switzerland, a building has to be Minergie compliable, but the architects wanted to prove that a building can provide more than insulating and ventilating. It can also produce its own energy.
At first glance, the multi-storey apartment building at Seestraße 416 in Zurich-Wollishofen blends in with its surroundings. The photovoltaic modules are hidden on the entire building envelope and they are on only visible when you approach the facade directly. The entire house is a solar power plant, without it being visible. But still 100% of the total surface area is used as energy harvesting area of house Solaris!
The black concrete floors allow the passive use of solar energy and store the heat of the solar radiation. The geometry creates eight facades that are oriented differently to the sun. These are covered with a textured, reddish coloured cast glass. This glittering glass skin puts the house in relation to the play of light on the lake and the colour of the surrounding buildings. The light that determines the aesthetics of the facade is turned into electricity by the monocrystalline solar cells. The facade and roof provide electricity for the house.
Photovoltaic module "Solaris"
ertex solartechnik GmbH
Finishing work / Electrical systems - Low and high current
ertex solar specializes in the production of modules for building-integrated photovoltaics, which are manufactured according to customer requirements.
For the building House Solaris in Zurich, two challenges had to be overcome. On the one hand, the modules should correspond to the architect’s colour ideas. On the other hand, the production of electricity should not be affected too much by the colouring. The result is a special photovoltaic module with a colour that was developed over the span of a few months. As front glass a special structured glass was used.
Thanks to the fully activated building envelope, the building is completely self-sufficient with the help of 1,300 photovoltaic modules in total and generates electricity beyond that. The individual solar-activated areas of the building envelope are optimally aligned so that electricity can be produced in a reasonably balanced way throughout the day and throughout the year.
In addition, scattered light is radiated onto the photovoltaic cells via the front glass used in the building envelope, which only results in yield losses of about 3-4%, although the cells are not visible to the naked eye even on closer inspection. The 47 kW PV facade system generates approximately 17,000 kWh per year, while the PV roof generates 14,809 kWh per year. The total solar yield of 31,832 kWh per year covers 47% of the total energy requirement of 68,000 kWh per year.
Construction and exploitation costs
- 5 900 000 €