For economic reasons, the building had to be implemented in concrete construction with a full thermal protection facade. By an alternative development proposal, deviating from the original requirements of the master plan, a more compact structure could be implemented, which reduces the built-up area, at the same time ensures better tanning of the occupant rooms on the courtyard side and offers more living space and less development areas for the same area.
The compactness of the structures and the clear structural design grid across all floors, the use of semi-finished parts, prefabricated elements and floor slabs in the shell construction as well as the space-optimized development system allow for moderate construction costs despite high equipment quality and excellent energy values. Professional quality assurance and process support in the execution planning as well as in the construction work by the project management contributed significantly to the sustainability.
The rainwater is seeped through infiltration baskets in a core of the earth at the site. The water consumption is reduced by flow restrictors and by fittings with extended cold water range, as the requirement for hot water in dormitories is above average, significantly reduced.
For more than 10 years, all student residences of the OeAD-WV have been built only in the minimum passive house standard according to the guidelines of the Passive House Institute Darmstadt.
A highly insulated, preferably thermal bridge-free and airtight building shell as well as a comfort ventilation system with heat recovery are the basic requirements for reaching the passive house standard.
To achieve the zero energy standard, a centralized ventilation unit with 2 parallel rotary heat exchangers with heat and moisture recovery and special filters has been developed to reduce energy consumption. In the course of the research project, the ventilation could be carried out on demand and the energy consumption could be reduced. The residual heat requirement is covered by Fernwärme Wien.
The water heating is also provided by Fernwärme Wien.Mittels Wasserpararmaturen with an extended cold water range (cold water in the middle position), the hot water consumption, which is in the houses of the OeAD-WV from experience above average, be reduced.
On the flat roofs, the largest possible PV system was installed. In order to reduce the surpluses that would have to be fed into the grid, a battery storage system was installed in the 2.UG as part of a research project. By an electrical power measurement at the root of the house, the excess can be measured and buffered in the battery system. At times of an energy deficit at the root, the battery can be discharged into the home network.
Three home users, the Austrian Exchange Service Housing Administration (OeAD-WV), the Austrian Young Worker Movement (ÖJAB) and the Housing Association for Private Employees (WBV-GPA) have come together for the first time to jointly realize a forward-looking project in a new district - a highly efficient passive house for 313 Austrian and international students. Due to the three different home operators, an interesting mix of the residents and thus also an important impulse for the new district can be expected. The WBV-GPA has also taken on the role of developer and installer.
At the time of its opening, GreenHouse was the world's first certified Passive House Plus (PHI) student dorm, accompanied by a research project on electricity storage and monitoring energy consumption.
In 15 reference rooms, 5 in each component, an extended monitoring with various measurements takes place. For precise control of the energy balance of the building, calibrated heat meters, energy meters, electricity meters and water meters, temperature sensors, window contacts, humidity sensors, etc. are used distributed throughout the building. The meters are equipped with bus modules and communicate directly with the building management system (BMS). The research project is being carried out by ASCR (Aspern Smart City Research) and Siemens.
All forms of temporary living are possible. Due to the variety of space (single apartments, double rooms, shared apartments for 2 - 4 people in different equipment categories) usable for almost all user groups. The arrangement of the 3 buildings and the distribution of common areas on all buildings a mix of user groups is possible. The entire development in the building and the majority of all room units are barrier-free usable therefore a conversion as a senior apartment or assisted living is conceivable.