the main objective of a research program, whose output is presented here, has been to estimate “ventilation coefficients”, a critical parameter in determining air pollution concentration near the surface ground which signifies the ability for natural ventilation of an air shed in an urban or rural area. relevant measured data from the city of tehran has been used to calibrate and further de...

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...

Natural ventilation is an important factor in the design of sustainable buildings; it has the potential to improve air quality, while providing thermal comfort at reduced energy costs. Computational fluid dynamics (CFD) simulations provide comprehensive information on the internal flow pattern and can be used as a design tool. The present work offers insight of natural ventilation in a fully fu...

The unique architectural style of traditional “Yinzi” dwellings in Western Hunan, China, needs to be protected and their natural ventilation of patio space should also be promoted. Therefore, this study aimed at finding out the natural ventilation values and limitations of “Yinzi” dwellings as well as designing an optimum ventilation strategy for such dwellings. In this work, the thermal enviro...

Maximising the natural ventilation of a building can be beneficial in terms of comfort and reduced reliance on air conditioning. In noisy urban areas this can conflict with the need to reduce the ingress of external noise. In this study the effect of building exposure to noise on natural ventilation potential is investigated. The occurrence of window openings on a building façade was adjusted a...

Abstract Despite the proven benefits of natural ventilation (NV) as an effective low-carbon solution to meet growing cooling demand, its effectiveness can be constrained by poor outdoor air quality. Here, we propose a modeling approach that integrates highly granular pollution data with coupled EnergyPlus and differential equation airflow model evaluate how NV potential for space changes when a...

BACKGROUND Building materials and the ventilation rate of a building are two main factors influencing indoor radon and thoron levels (two radioactive gases which have the most important role in human natural radiation exposure within dwellings). OBJECTIVES This analytical descriptive study was intended to determine the relationship between indoor radon and thoron concentrations and the buildi...

Using computational fluid dynamics (CFD) techniques to model buoyancy-driven airflows has always proved challenging. This work investigates CFD modelling of buoyancy-driven natural ventilation flows in a single-storey space connected to an atrium. The atrium is taller than the ventilated space and when warmed by internal heat gains producing a column of warm air in the atrium and connect space ...

A series of investigations has been conducted in the 2009 Solar House located on the Missouri University of Science and Technology campus, to develop a climate-response control for a natural ventilation system. Firstly, the research investigated the relationship between indoor thermal comfort and climate. Predicted Mean Vote (PMV) was selected to evaluate the thermal comfort, which was calculat...

In order to fulfill this objective, field measurement of three different HDB flats, i.e. 3-Room flat, 4-Room flat as well as Executive maisonettee were conducted. The three flat types selected represent the more distinct broad range of public housing accommodation in Singapore. 3 main parameters that include ambient air temperatures, relative humidity as well as air velocity were collected over...