AIVC - Air Infiltration and Ventilation Centre

Search form

EBC

You are here

Home

wind speed

Analyzing night time wind speed reduction effects from densification on predicted outdoor thermal comfort in a subtropical setting

The relationship between urban growth and the formation of urban heat islands, i.e. climatic differences between the urban area and adjacent rural areas, is discussed by several authors and is assumed to be ubiquitous for various climatic regions. Curitiba (25.5ºS), located within a region of subtropical climate in elevation, boasts a population growth rate of approximately 2% a year. The purpose of this study is to evaluate the effect of the urban agglomeration on microclimate changes.

On the Air Flow in Urban Canyons for Ventilation Purposes

The work described in this paper formed part of the European UrbVent project on urban ventilation.Measurements of wind speed, wind direction, and air temperature were made at four different heights, inside a pedestrian street canyon in the centre of Athens, Greece, and at the top of the canyon. In addition, infrared radiation on the canyon faades was measured. Experimental data were collected at intervals of 30 seconds. The dimensions of the canyon were: height/width=2.3, length/height=50/23=2.2 with an orientation of 12 degrees from North.

Natural ventilation characteristics of courtyard buildings in Singapore.

Researches into natural ventilation characteristics of courtyard buildings have been carried out extensively in climates very different from tropical climate. Nevertheless, courtyards have been incorporated for centuries in traditional shop houses and also adopted in many modern commercial buildings in tropical countries such as Singapore. This paper discuses a study to investigate the natural ventilation characteristics of courtyard buildings in Singapore. Four typical courtyard buildings are examined.

On the impact of the urban environment on the potential of natural ventilation.

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.

Estimating Wind Frequency for Natural Ventilation at Remote Sites

Using the wind pressure difference method to estimate the cross ventilation potentials of a building at a particular site, the appropriate wind frequency data at the building site are important (Aynsley et al, 1977, Su, 2001). This study investigated wind frequency data available from the data recording site at Auckland airport and discusses how to obtain the building site wind frequency data from the original wind frequency data recorded from such sources.

Passive stack ventilation with heat recovery.

Attempts to assess the performance of heat pipe heat recovery units for naturally ventilated buildings. The effectiveness of four heat pipe units was measured in a two zone chamber. The pressure loss characteristics of the units were determined by computa

On the persistence of low wind speed conditions.

Light wind conditions are important in the assessment of risks from releases of hazardous gases, in the assessment of urban air quality, and also in the determination of ventilation requirements for buildings. Although very light winds would often prese

Pages