AIVC aims to play a central role in the ventilation and infiltration community with respect to the dissemination of information, either with its conferences or workshops, or with the material available on its website. The annual conferences continue to be greatly appreciated: 96 % of a sample of 76 conference attendees rated the 34th conference as excellent or satisfactory, 91% would recommend it to others. As you will see in this newsletter, we are working to uphold this quality for our future events.
There is a trend to perform more ventilation and air infiltration measurements in buildings, either to strengthen commissioning procedures or to learn from field data. This trend is stronger in nearly zero-energy buildings projects or programmes given the significant share of ventilation and infiltration losses on total building energy use.
The design of fans has evolved to meet the ever-increasing demands for higher efficiency machines, combined with the requirements for lower noise and high availability. In addition many fans are now being used in safety related applications, such as smoke control in buildings and underground spaces in the event of a fire. Variable speed is now more common, leading to some additional design problems and many existing users are revisiting their plant looking at ways to upgrade the fans.
The just published by JRC report on 'Harmonisation framework for health-based evaluation of indoor emissions from construction products in the European Union based on the Lowest Concentration of Interest approach (EU-LCI)' (ECA report 29) is now available here!
Submitted by Maria.Kapsalaki on Mon, 02/10/2014 - 11:32
Legislative drivers and new research on the importance of building and ductwork airtightness are leading to increased activity in this aspect of building energy performance. Qualification schemes for competent testers, training and events and where to find the best information are summarised here.
Submitted by Maria.Kapsalaki on Mon, 02/10/2014 - 10:55
Building and ductwork leakage are detrimental to energy conservation, comfort, and hygiene. They can cause building damage and it can prevent proper control of the ventilation airflow rates. Through the ASIEPI project, we have identified that while some key elements for a market transformation on envelope airtightness are under development in many countries, status quo seems to prevail for the duct market. With the objective of all new constructions being “nearly zero energy buildings” in 2020, policy makers need to know how better airtightness can be stimulated.
Submitted by Maria.Kapsalaki on Mon, 02/10/2014 - 09:00
A full size simulation laboratory aircraft cabin comprising three rows of seats has been built. This represents the Airbus A320 and the China C919 aircraft. Experimental research on the attenuation rule of the individual air-conditioning isothermal jet flow from nozzles positioned above the seats was conducted. The results show that axial air velocity continuously decreases with increasing cross-sectional distance. For a distance x < 0.4 m, (the axis air velocity sharp attenuation area), the velocity of attenuation slows.
Submitted by Maria.Kapsalaki on Mon, 02/10/2014 - 08:57
The redispersion factor of microbe-carrying particles, which is the ratio of the concentration of floor-derived microbes in room air to those on a floor surface, was determined, as was the percentage of floor-derived microbes in room air. These relationships were shown to vary according to conditions in the room. Equations were derived that allow these relationships to be calculated for a variety of room conditions, including air supply rates, levels of personnel activity, and the effect of gravitational deposition on microbe-carrying particles.
Submitted by Maria.Kapsalaki on Mon, 02/10/2014 - 08:56
In hot climates a comfortable indoor environment is important. Mechanical fans are often introduced to cool the indoor air. However, it has been found that the airflow from such fans is not comfortable, especially compared with natural wind. Artificial airflow in an enclosure has been known to disturb hair, irritate eyes, and distract occupants. This paper presents the result of an experimental study on the characteristics of household airflow inducing appliances. The details of experiments carried out in the laboratory are described.
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