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Karlsruhe, Germany

A software tool for quantitative assessment of the effectiveness of photo-catalytically active surfaces was developed in collaboration with HeidelbergCement AG. The photocatalytic process of degradation is modeled in analogy to deposition processes. The resistance model used is based on guideline VDI 3782/5. A comparison with measured NOx data at the monitoring station was conducted to establish whether the model chosen would realistically record the concentration level in the street canyon. Simulation took place of an additional calculation to take account of the TiO2 surfaces on the roads, the parking lots, and the sidewalks. Based on calculated results presented at the Hohenheimer Strasse monitoring station, a reduction of the NOx annual average value by approximately 4% can be achieved under the assumed conditions. Annual average reductions of up to 6% are possible for the entire street canyon. Greatest reductions can be achieved near the buildings. Source

Letzel M.O.,Ingenieurburo Lohmeyer | Flassak T.,Ingenieurburo Lohmeyer | Angel D.,Ingenieurburo Lohmeyer
Gefahrstoffe Reinhaltung der Luft | Year: 2012

This study shows that flow and turbulence input from MISKAM substantially improves AUSTAL2000 dispersion calculations near buildings compared to those schemes and models that are included in AUSTAL2000. In many cases, the latter underestimate the concentration near buildings. For dispersion calculations with resolved buildings, AUSTAL2000 superposes building-induced extra turbulence on stratification-dependent atmospheric turbulence. The extra turbulence is parameterized in a general way based on wind tunnel studies. This study adopts and implements this superposition for flow and turbulence input from the prognostic, microscale flow and dispersion model MISKAM. Besides the wind field, AUSTAL2000 now also takes the building-induced extra turbulence from MISKAM as input. The new MISKAM-AUSTAL2000 coupling combines the strengths of both models, it has been successfully validated based on wind tunnel experiments. Source

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