Buoyancy-Driven Single-Sided Natural Ventilation in Buildings with Large Openings
نویسندگان
چکیده
Full-scale experimental and computational fluid dynamics (CFD) methods were used to investigate buoyancy-driven single-sided natural ventilation with large openings. Detailed airflow characteristics inside and outside of the room and the ventilation rate were measured. The experimental data were used to validate two CFD models: Reynolds averaged Navier-Stokes equation (RANS) modeling and large eddy simulation (LES). LES provides better results than the RANS modeling. With LES, the mechanism of single-sided ventilation was examined by turbulence statistical analysis. It is found that most energy is contained in low-frequency regions, and mean flow fields play an important role.
منابع مشابه
Experimental and Theoretical Case Study on Cross Ventilation
Natural ventilation through windows and other openings in the building envelope is still the most common way to ensure the necessary fresh air supply in buildings. To date, there are few validated models for the calculation of ventilation rates through large openings. In particular, there is a lack of information about natural cross-ventilation. On the basis of an empirical study a mathematical...
متن کاملNatural Ventilation: Analysis of Indoor Airflow in an Assumed Cubic Building with Opposite Openings by CFD Investigations
The natural ventilation is an easy way to exchange the indoor polluted warm air with outdoor fresh air. The wind power injects outdoor fresh air into the building. A good indoor air current and subsequently a proper exhaust depend on the openings’ conditions and their situations. A serious architectural question is under what conditions of the openings the wind-cross ventilation can be effectiv...
متن کاملA New Empirical Model for Predicting Single-Sided, Wind-Driven Natural Ventilation in Buildings
Prediction of single-sided natural ventilation is difficult due to the bi-directional flow at the opening and the complex flow around buildings. A new empirical model was developed that can predict the mean ventilation rate and fluctuating ventilation rate due to the pulsating flow and eddy penetration of single-sided, wind-driven natural ventilation in buildings. The governing equation is base...
متن کاملThe fluid mechanics of natural ventilation-displacement ventilation by buoyancy-driven flows assisted by wind
This paper describes the fluid mechanics of natural ventilation by the combined effects of buoyancy and wind. Attention is restricted to transient draining flows in a space containing buoyant fluid, when the wind and buoyancy forces reinforce one another. The flows have been studied theoretically and the results compared with small-scale laboratory experiments. Connections between the enclosure...
متن کاملEnhanced Single-Sided Ventilation with Overhang in Buildings
Enhancing the ventilation performance of energy-efficient buildings with single-sided openings is important because their ventilation performance is poor and strongly depends on the wind conditions. We considered an overhang as a potential building façade for improving the single-sided ventilation performance. We performed numerical simulations of three-dimensional unsteady turbulent flows over...
متن کامل