Temperatures in urban areas are higher compared to the surrounding rural areas. In summer these increased temperatures have a negative impact on pedestrian comfort, health and energy demand for space cooling. Heat can effectively be removed from urban areas by wind. Wind is also important for the removal of pollutants to improve the air quality in cities. In urban environments winds are often blocked due to high building densities. With urban ventilation corridors the removal of heat and pollutant can be enhanced. The parameters, which influence the efficiency of urban ventilation corridors, have to be better understood to derive guidelines for urban planners.
Temperatures in urban areas are higher compared to the surrounding rural areas. In summer these increased temperatures have a negative impact on pedestrian comfort, health and energy demand for space cooling. Heat can effectively be removed from urban areas by wind. Wind is also important for the removal of pollutants to improve the air quality in cities. In urban environments winds are often blocked due to high building densities. With urban ventilation corridors the removal of heat and pollutant can be enhanced. The parameters, which influence the efficiency of urban ventilation corridors, have to be better understood to derive guidelines for urban planners.
First the wind tunnel models have to be designed. Urban morphologies have to be chosen, which will lead to insightful results. PIV (particle image velocimetry) will be used to measure the flow fields. The geometries of the wind tunnel models and the materials of the wind tunnel models must be chosen in such a way that the illuminated planes can always been seen with the cameras. Strong laser light reflections on the ground and wind tunnel models have to be mitigated. In a second step the wind tunnel measurements will be conducted in the large ETH/Empa atmospheric boundary layer wind tunnel. The measurements will be conducted for a large number of configurations. Finally, the measured results have to be post-processed and analyzed in detail. Based on the analysis conclusion will be drawn on how urban ventilation corridors should be designed to use their full heat and pollutant removal potential.
The work will be performed at the experimental facilities of Empa (Dübendorf). The ideal candidate has knowledge in fluid dynamics.
First the wind tunnel models have to be designed. Urban morphologies have to be chosen, which will lead to insightful results. PIV (particle image velocimetry) will be used to measure the flow fields. The geometries of the wind tunnel models and the materials of the wind tunnel models must be chosen in such a way that the illuminated planes can always been seen with the cameras. Strong laser light reflections on the ground and wind tunnel models have to be mitigated. In a second step the wind tunnel measurements will be conducted in the large ETH/Empa atmospheric boundary layer wind tunnel. The measurements will be conducted for a large number of configurations. Finally, the measured results have to be post-processed and analyzed in detail. Based on the analysis conclusion will be drawn on how urban ventilation corridors should be designed to use their full heat and pollutant removal potential.
The work will be performed at the experimental facilities of Empa (Dübendorf). The ideal candidate has knowledge in fluid dynamics.
Jonas Allegrini
ETH Zürch,
Chair of Building Physics,
D-MAVT,
ajonas@ethz.ch
Empa Dübendorf,
Multiscale Studies in Building Physics,
Überlandstrasse 129,
8600 Dübendorf,
Switzerland,
jonas.allegrini@empa.ch
Jonas Allegrini
ETH Zürch, Chair of Building Physics, D-MAVT, ajonas@ethz.ch
Empa Dübendorf, Multiscale Studies in Building Physics, Überlandstrasse 129, 8600 Dübendorf, Switzerland, jonas.allegrini@empa.ch