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Renovation, Roncalli College Munich
When you take a look at the student halls of residences in Nymphenburger Strasse in Munich, it soon becomes clear that the building is in sore need of comprehensive renovation. However, in this refurbishment project the student design from Munich University of Applied Sciences was not just interested in improving its appearance but also had very definite goals regarding the energy performance, whereby the installation of a modern ventilation system, first class insulation and the use of a photovoltaic system are all components of the renovation concept.
How the judges assessed it:
“In relation to the proposed renovation of a student hall of residences from 1968, a double facade is planned for both the south and north elevations, which in addition to minimising the heat losses and utilising passive solar gain will also provide sound protection. In addition to utilising passive solar energy, the energy concept also focuses on the use of an air-water heat pump that makes targeted use of the waste heat from the building. The energy concept is supplemented by the photovoltaic system integrated in the roof and facade.
Remarkable is the high proportion of renewably generated electrical energy, which in terms of the annual energy balance transforms the building into an energy-plus house. As part of the further development of the project, a greater focus on the design features of the existing facade would be desirable that takes into account the different orientations of the two facades (south/north – garden/street) with more consistent calculations.”
Building concept
The Roncalli College student accommodation, which was built in 1968 and is located in Nymphenburger Strasse in Munich, is consequently set back from the street line. The banded facade of the reinforced concrete skeleton structure consists of horizontally clad precast concrete panels.
The aim of the design is to maintain and strengthen the horizontal structuring of the building while improving the living quality. The design reorganises the spatial arrangement of the floor plans, whereby the private living areas are situated on the southern side and the communal areas are situated on the northern side. The individual student rooms are now equipped with their own sanitary cells and are 16 square metres in size. The sanitary cells and the complete fittings for the student rooms will be produced in glass fibre-reinforced plastic and supplied as prefabricated components.
Energy concept
The building is centrally heated via a ventilation system. The ventilation technology is located on every floor in a suspended ceiling in the central access corridor. From there, all the rooms are supplied with fresh air and heat, whereby the exhaust air is removed via the sanitary cells. The ventilation system is used in conjunction with an air-water heat pump. The supply air is pre-tempered by using air from the underground garage. Hot water is provided using an instantaneous hot water heater in each sanitary cell. Part of the energy required will be generated using the photovoltaic system on the roof and the solar modules integrated in the facade. Surplus electricity produced during the summer months will be fed into the electricity grid. This is different in winter, when the additionally required energy will be drawn from the electricity grid.
The rooms will be set back by 60 centimetres from the existing facade both on the north and south sides, thus creating a narrow terrace. This zone, which on the north side provides sound protection and on the south side acts as a climate buffer, is defined through the double facade. The outer skin of the facade, which can be closed or opened in accordance with the weather conditions, consists of sliding glass panels. On the south side, these are partly fixed and a quarter of them are furnished with photovoltaic elements. The electricity generated from the facade and the additional photovoltaic system on the roof is used for air conditioning the building.
The use of vacuum insulation on the roof enables the existing height of the attic storey to be maintained and therefore also the spacing requirements. In comparison with double glazing, the triple-glazed windows with a U-value of 0.61 W/m²K offer optimal thermal insulation.