AIVC - Air Infiltration and Ventilation Centre

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natural ventilation

Reducing the ingress of urban noise through natural ventilation openings

This paper deals with techniques aiming at reducing noise entering into naturally ventilated buildings while reducing airflow path resistance.The description of the combined experimental and theoretical approach is made. A method is suggested to enable the acoustic and airflow performance of apertures for natural ventilation systems to be designed simultaneously.

Association of air-conditioning with respiratory symptoms in office workers in tropical climate

Reported symptoms from 2000 workers in air-conditioned offices and from 500 workers in natural ventilated buildings have been analyzed using univariate and multiple logistic regression models.The conclusion of that study is that buildings with air conditioning have a higher prevalence of work related upper respiratory symptoms than buildings with natural ventilation though located in tropical country with high relative and absolute humidity rates all around the year.

Ventilation performance measurement using constant concentration dosing strategy

For that study, the constant concentration dosing method and the decay method were used to test air changes performances in an office equiped with a VAV mechanical ventilation system and in a domestic apartment with natural ventilation . The measurement results from those two tracer gas methods are compared.

How to use natural ventilation to cool narrow office buildings

There is a resurgence of interest in naturally ventilated offices. Most of the time, cooling the buildings is possible with the opening of windows. Simulations with the softwere TAS were made and showed that window opening allow a sufficient day or night ventilation rate, even if wind characteristics are not favourable. The optimal size, shape and location of the window apertures to reach sufficient ventilation rates has been studied along with the impact of the wind orientation and the building degree of protection on these ventilation rates.

Comparative study of the indoor air quality of naturally ventilated and air-conditioned bedrooms of residential buildings in Singapore.

For that study, IAQ measurements were carried out in 3 residential Singapore dwellings. CO2 levels were higher in air-conditioned bedrooms than in naturally ventilated bedrooms. Another survey demonstrated that almost all occupants using air-conditioners while sleeping presented one or more SBS symptoms than when using natural ventilation.

The influence of indoor environment in office buildings on their occupants : expected-unexpected

For that study the measurement of parameters in the indoor environment were carried out with a simultaneous survey with questions dealing with elements of the indoor environment, health status and health problems. That study reveals a significant role for the psychological state and psychological factors of the respondents of natural ventilation when sujectively describing the indoor environment.

The study of active stack effect to enhance natural ventilation using wind tunnel and computational fluid dynamics (CFD) simulations

The use of a combined methodology of wind tunnel experiments and CFD simulations in order to study the potential of using active stack to enhance natural ventilation in residential apartments in Singapore is demonstrated in this paper. Comparison between the results obtained from the experiments and those from the simulations has been made.

Thermal comfort for naturally ventilated houses in Indonesia

This paper presents an extensive field survey conducted in residential naturally ventilated buildings in Indonesia. The data gathered has been analyzed and revealed that the Predicted Mean Vote equation predicted a warmer thermal perception compared to what people really felt. Under hot and humid tropical climate, people in free-running buildings had a preference for cooler environment and for higher wind speed.

Natural ventilation in high-rise buildings with double facades, saving or waste of energy

For that study , three german buildings with double facades have been monitored for at least one year in order to evaluate their energetic performance. The first building had no air conditioning facilities, the second one had cooling equipment without mechanical ventilation, and the third one had cooling equipment combined with mechanical ventilation.