Paper Conference

Proceedings of ASim Conference 2014: 2nd Asia conference of IBPSA-China, Japan, Korea


Numerical simulation of inter-flat pollutant dispersion routes and cross-contamination risk in high-rise residential buildings

Di Mu, Naiping Gao

Abstract: By using computational fluid dynamics (CFD) method, the inter-flat pollutant dispersion and cross-contamination around high-rise residential buildings due to both wind-driven and buoyancy-driven single-sided natural ventilation are investigated. The RNG k-ε model is adopted to solve the airflow field. Tracer gas technique is used to quantify the reentry of exhaust air from the source flat to other flats under different wind conditions. By analyzing the concentration distribution, the possible dispersion routes and the risk of air cross-contamination are revealed. The results illustrate that, with single-sided open-window conditions, the pollutant could spread in both vertical directions. High risks of infection are observed not only in the condition when the windows are on the windward side and leeward side, under which condition the reentry ratios of the flat immediately above the source floor can be up to 18.6% and 9.6% respectively, but also in the case when the wind direction is horizontally parallel to the building façade where the reentry ratio of the flat immediately below the source floor is up to 26.8%.
Keywords: High-rise residential building; Computational fluid dynamics; Tracer gas; Pollutant dispersion routes; Cross-contamination risk
Pages: 75 - 82