AIVC - Air Infiltration and Ventilation Centre

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indoor climate

Three examples of improvement of ambient conditions in industrial premices

Three experiments aiming at improving the atmosphere in industrial premices are described in this paper. The working conditions of the staff have been improved along with an amelioration of the process and quality of fabrication.The third example proves that a well adapted technical approach allows the improvement of working conditions coupled with an energy control.

Comfort notions. The control of indoor atmospheres

The notion of comfort is not easy to define. As it relies on elements partly subjective, a statistical approach of the user requirements is necessary.In order to reach the optimum reduction of the causes of discomfort, the profession in charge with the indoor air quality has adopted a certain number of rules that working groups of standardization try to improve and complete.

The effect of air temperature on labour productivity in call centres - a case study -

A study on the effect of air temperature on productivity was carried out in telecommunications offices with an observational approach in call centre 1 and an intervention approach in the second call center by installing cooling units.The study shows that the productivity can be reduced by 5 to 7 % when the indoor temperatures increase.

Thermal comfort in classrooms in the tropics

Thermal comfort variables were measured in Singapore mechanically ventilated classrooms. In parallel the cccupants filled questionnaires on their perception of the indoor climate. The results showed that ASHRAE Standard 55 was not applicable in free-running buildings in the tropics. The study showed that generally cool thermal sensations were more readily accepted by the classroom occupants than warm thermal sensations.

Solving the O&M equation

An effective and successful O&M (operation and maintenance) program for schools begins at the very start of the project and not at its facility completion : key design issues must be covered during planning and design phases. The owner must be identified and listened to, the understanding of how the O&M staff works, what its capabilities and technology skill level are, will help in designing the right facility within the capability of available resources.

Integration of high environmental quality comfort requirements during the retrofitting of educational buildings.

A important part of educational buildings must be retrofitted in many European countries, in the next years, for historical and demographic reasons. These retrofittings must be carried out with a limitation of energy consumption and a better indoor comfort. In this context, Annex 36 of International Energy Agency aims at promoting energy efficient measurements of educational buildings in the retrofitting process. In the same time, in France, decision makers want to integrate high environmental quality comfort requirements.

Effect of architectural decisions on indoor climates of residential buildings

The comparison of indoor temperatures measured in different Beijing buildings without air conditioners allowed those conclusions : the indoor temperature is different according to the floor at which a room is located , a high insulation of external walls and roof, along with a proper location of fenestrations and window shading can reduce incidence of solar radiations and improve indoor climates of the room.

The impact of humidity on health and comfort in an office building

Monitoring of temperature and relative humidity was carried out in an air-conditioned office building during the heating season. In addition, occupants filled in health and comfort questionnaire. Without informing the occupants, humidity was reduced in an experimental area compared to the control area. As this reduction was not so great (2% relative humidity), the differences of occupants perception between areas are not significant. A slight reduction of building related symptoms was observed at higher humidity.

Field investigations on comfort in office buildings

A method based on both measurements and questionnaire has been developed to investigate comfort in office buildings. The measurements apparatus records temperature, humidity, noise, light, odours and occupant's perceived comfort. The questionnaire contains information about indoor climate and working environment. Results are given and analysed for 60 offices in France.

Optimal temperature setting of indoor air-conditioning after walking outdoors in supmmer and winter

The aim of this study is to investigate an optimal air-conditioning adjustment for an indoor space where people come in and out. The authors conducted the experiments by measuring the physiological and psychological responses of subjects who walked outdoors and then entered a chamber. Psychological responses to summer climate were grouped within three categories of: "cool" - "comfortable," "hot" - "uncomfortable," and "cold" - "uncomfortable." These responses are related with subjects perspiration.