aspern Vienna´s Urban Lakeside - subproject 1: Public Space and Micro Climate: Basics for climate sensitive planning in Aspern

The Project will derive planning examples and recommendations in order to optimize the building performance as well as outdoor amenity. The study will be based on a climate prognosis of the aspern area and compare different reference examples of construction and open space design.

Short Description

This project is a sub project of the flagship project "aspern Vienna´s Urban Lakeside".




Starting point / motivation

The initial point of the planned work is the determination of the macroclimatic preconditions: local model simulations will be carried out with two regional climate models. By doing so, data for an average and a hot year will be made available. For the subsequent simulations of the building physics, climate data containing temperature, precipitation, irradiation, cloudiness, humidity and wind with a time resolution of one hour will be extracted. Based on these values, further indicators will be derived on a daily or monthly basis e.g. for the determination of climate comfort indices.

Contents and goals

The goal of the project is to derive planning and design guidelines for the development of climate aware and energy efficient city planning and to support the implementation of such planning principles by the elaboration of a design framework and implementation guidelines.

Methods of treatment

For this purpose, results will be elaborated in the following steps. For the development of the models for the subsequent simulations and their plausibility check, the effects of the urban open space on the microclimate must be known. For this purpose, the fundamental interactions between urban open space will be determined. This will be achieved by literature analysis of available research and case studies of international planning activities. These results shall yield criteria for the selection of reference spaces, moreover characteristic materials will be investigated regarding their microclimatic effects and their related properties will be quantified in order to support the transformation functions and the simulations of the reference spaces.

In order to study representative cases, the definition of reference spaces will identify appropriate combinations of building geometry, surface properties, park areas and the specific building construction.

As the quantitative investigations on energy efficiency of buildings are usually based on standardised weather data (e.g. test reference year files) which are derived from weather stations, an effective and scalable way for the transformation of macroclimatic conditions on the local level is needed. The project will develop and test such functions, which will allow the derivation of the building relevant microclimatic parameters (temperature, irradiation, humidity, wind) from the standardised weather station data.

The modelling of the reference spaces will use the transfer functions and open space simulation tools in order to compare the reference spaces according to (i) building energy demand (ii) indoor thermal conditions and (iii) outdoor amenity values and elaborate a relative ranking among the investigated options.

Expected results / conclusions

In order to give an application perspective to the extent possible, the identified relations between the design of the overall city surface (urban open space & building) on one hand and the building efficiency and the amenity values on the other hand will be summarised in a proposals for measures, which shall be available for a timely communication to the teams of the housing development com-petitions and the urban open space planners.

Project Partners

Project management

Wien 3420 AG

Project or cooperation partner

  • AIT
  • TU-Wien

Contact Address

DI Dr. Christoph Pollak
Rosthorngasse 5
Tel.: +43 (1) 7740274 52