Greening Aspang: Towards a sustainable and climate optimized new city quarter in Vienna, Austria

Client: Smart Cities Initiative of the Climate- and Energy Fonds of Austria

The new city quarter EUROGATE I+II on the Aspangründe is one of the flagship projects in the city of Vienna to demonstrate how the use of green infrastructure as an integrated tool in the whole planning process can reduce urban heat stress.

Within the Smart Cities Initiative of the Austrian Energie- und Klimafond, different scientists from ENVI-_MET, the TU Wien and the BOKU Wien came together to solve the question – if and how it is possible to bring back nature into the urban space to improve quality of life and urban microclimate?

In the project, the ENVI_MET team analysed different heat stress situations during a typical summer and the resulting thermal conditions at the level of the urban streets. The results of the ENVI-met model were then linked to the building physics model WUFI operated at the TU Wien to analyse the impact of the outdoor microclimate on the building thermal performance and energy demands.

In close collaboration with urban planners, architects and local residents, different greening scenarios were developed for the Aspangstraße. These scenarios were then analysed using computer modelling to optimize the ideal quantity and placement for different kinds of urban greening strategies, ranging from classical street trees to green façades and rooftop gardens.

Using only passive green strategies, the local air temperature inside the urban streets could be decreased by 2 kelvin or more both for both daytime and  nighttimes scenarios.