Knowledge and estimation of the wind speed and air flow characteristics, in a city, is of vitalimportance for passive cooling applications and especially in the design of naturallyventilated buildings. This study is referred to the analysis of the wind characteristics in urbancanyons as a function of the free stream wind. The impact on the airflow rate calculation isdiscussed for an urban canyon. The goal of this study is to get a better insight of the impact ofthe urban environment on the ventilation effectiveness.
Passive cooling strategies can offer significant opportunities for improving the occupants' ambient comfort conditions whilst reducing the energy consumption in hot climates. This is particularly applicable for buildings located in hot/arid regions with large cooling toads due to the use of mechanical systems for space climatization. This research examines the potential of passive cooling strategies in a commercial building located in a typical hot/arid climate of Mexico.
This paper discusses the use of the 'wind wing wall' as a device for the passive low-energy 'comfort cooling' of the occupants in the interior of a tall building. The case study building is a 21-storey, high-rise office tower. the UMNO building designed by Hamzah and Yeang located in Penang, Malaysia which has been designed to be airconditioned, but can also be naturally ventilated if conditions are suitable. The paper describes cfd air flow modelling of the wind effects on the building and the effect on internal temperatures, air movement and ventilation.
In hot climates ventilation can be a useful means of cooling dwellings, if the outside air is cooler than that inside the dwelling. Often, in hot regions the outside air is so hot during the day that cooling by ventilation is of no benefit until the evening when the outside air cools. Ventilation can then be beneficial, and can be promoted by a sun-warmed cavity or 'solar chimney' added to a building on the sun ward side. The cavity may be of any material of high thermal capacity. Heat from the sun is stored within the walls and heats the air within.
A major concern of those wishing to limit the energy use in buildings is the growing trend towards installing air-conditioning in new and refurbished buildings. The Airlit - PV project has taken this challenge and has designed a novel fa9ade unit incorporating the latest thinking in solar control, natural ventilation, daylighting and photovoltaic power. By careful design and intelligent control the goal is to reduce the impact of solar and internal gains to such an extent that mechanical cooling is not required to maintain comfort conditions.
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