AIVC - Air Infiltration and Ventilation Centre

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Implementation and experimental validation of passive design principles used in naturally ventilated buildings under humid tropical climates.

Describes a global approach to passive design of naturally ventilated buildings situated in the French overseas territories. This approach involves all those involved in the buildings creation process, including architect, owner, building physicists and climate engineers. A validated thermal and airflow building simulation software was used to assess the design and sizing. A reference document was created from the optimal technical specifications, and has been used to build over 800 new pilot homes.

The use of natural ventilation and air conditioning for houses in warm-humid climates.

There are important benefits to come from using passive techniques as opposed to artificial cooling. They may not be sufficient to provide thermal comfort throughout the year in wet tropical areas, however. Few experiments have been performed on the thermal performance of buildings using a mixed-running strategy in warm-humid climates. The paper attempts to demonstrate that a possible dual-mode integrated operation can be used for such locations.

Natural ventilation of the housing in hot and humid climates: some suggestions for the design of urban blocks.

The study aimed to identify the behaviour of wind in the type of urban blocks usually found in cities in tropical climates. The results presented here were obtained in colonial type areas. The authors' approach was to establish a relationship between the clusters of buildings and the evidence of overpressures or low-pressure in proximity to the openings of occupied spaces. A prominent physical feature of natural ventilation is the maximal difference of pressure between windward and leeward building facades.

Influence of different surface systems and ventilation strategies on critical states of the indoor climate and the construction.

Many buildings in Austria experience poor indoor climate states and critical states of their construction. Possible causes of the high moisture content of indoor air might be bad ventilation or high moisture content of the buildings because of rising damp or weathering. Retrofitting is needed to increase indoor climate comfort levels. It is essential when designing the retrofitting to understand and predict the influences of different actions on the building's indoor climate and behaviour.

Indoor air quality, ventilation and energy studies in hot and humid climates.

Considers how ventilation provision affects the indoor air quality in tropical climates, and the energy aspect. Describes a series of research projects aimed at obtaining a detailed database of IAQ, ventilation and energy measurements, carried out in Singapore in the mid to late nineties. Obtained the overall energy consumption of a dedicated air handling unit that served the zones in which the relevant IAQ and ventilation measurements were done. Presents the results for five air conditioned buildings in Singapore.

Soft air conditioning in storage rooms.

Investigates the possibility of limiting ventilation in archival storage areas when the outside conditions would have a detrimental effect on the humidity. Conducted measurement-based simulations on the Vaud state archives in Lausanne, Switzerland, with a continental mild climate. Recommends good insulation and high thermal mass.

A method of assessing the utilisation of outdoor air for summer cooling in warm/humid climate.

The study developed a method to assess the capability of outdoor air utilized for summer cooling in urban apartments in the hot, humid climate of Taiwan (average yearly temperature 23 Deg C, average humidity 85%). The assessment method is approached using three aspects of identifying the maximum comfort room temperature, estimating the cooling capacity of applied outdoor air volume, and calculating the required outdoor air and pre-cooled outdoor air volumes for cooling through cooling load calculations.

Mechanical ventilation protects one-storey single-dwelling houses against increased air humidity, domestic mite allergens and indoor pollutants in a cold climatic region.

States that poor ventilation is a factor in raising humidity levels in well insulation cold climate housing. Aimed to look at the ventilation rates in houses with varying ventilation systems, noting indoor air humidity, domestic mite allergen levels and VOCs. Enzyme-linked immunosorbent assay was used to measure levels in 59 similar one-storey single family houses. 22 houses had an added mechanical supply and exhaust ventilation system.

Effect of central air conditioning and meteorologic factors on indoor spore counts.

The effect of residential central air conditioning on indoor spore counts was investigated. Six pairs of residential buildings were monitored for three days. The homes were both air conditioned and non-air-conditioned. An Andersen sampler was used and outdoor measurements were also taken. Kitchens and bedrooms of air conditioned homes revealed significantly lower spore counts. The study used multiple regression analysis to show that the lower spore counts were associated with lower relative humidity.

The acute effects of humidifiers on asthma morbidity.

In order to examine the possible effects of humidifier use on asthma control, a randomised controlled study was performed. No significant differences were found when analyses were restricted to portable humidifiers, allergies to mites and/or moulds, and infrequently cleaned humidifiers.