engleski

Experimental model of building natural ventilation in urban environment

Natural ventilation is the process of air change in an indoor space without using mechanical devices, i.e by using simply natural forces like flow momentum and buoyancy. When designing bioclimatic, passive, high performance buildings, it is important to enhance natural ventilation in order to minimize energy consumption, improve air quality and reduce environmental pollution. The scope of the present work is on a sensitivity of ventilation rates for a building, which is a part of an urban neighborhood. The cross-ventilation and single-side ventilation for various flow incidence angles were studied. Measured ventilation rates were compared to the reference results that were obtained for a referent stand-alone cubic building model. The experiments were carried out in the atmospheric boundary layer wind tunnel at the Institute of Fluid Mechanics and Heat Transfer (IFMHT) at the Graz University of Technology (GUT), Austria. The hot-wire anemometry was used to determine flow characteristics, while the tracer gas system was applied to estimate airflow rates of the cubic building model. The atmospheric boundary layer was successfully simulated for a suburban terrain exposure. The airflow rates obtained for a ventilation of a stand-alone cubic building model were observed to be larger when compared to a cubic building model situated in an urban neighborhood model. In the latter case, the ventilation efficiency is larger for less densely spaced building models.

Natural ventilation ; atmospheric boundary layer ; urban environment ; small-scale experiments ; atmospheric boundary layer wind tunnel

nije evidentirano