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.

This article discusses how to integrate all air-to-air devices into an HVAC system that may contain one or more air-to-air exchangers as well as conventional components for ventilation and comfort control.HVAC systems with air-to-air exchangers need to be carefully designed for the location of each device in the system, with the winter and summer design performance of each device and the total annual energy saved by the HVAC system.

Variable Air Volume system use VAV boxes that serve open areas for five or more occupants, each zone is controlled with a single space temperature sensor. But VAV zone control strategies remained the same for the last years, so the designers have to consider that system : it provides a high quality environment for occupants, it permits the use of a smaller air-distribution system that is low cost and does not compromise building comfort or operating efficiency.

This paper asks questions about what is the right tightness and a warns against too tight tightness guidelines.The author gives advice :- A tight building envelope should reduce average natural infiltration (due to wind and temperature) to 0.05 to 0.1 air change per hour.- A tight building envelope should contain the desired air pressure field.- A building envelope should not be too tight because of the unbalanced airflows that can create excessive levels of depressurization.

The investigation was made in a Finnish building built for people with respiratory diseases. During 3 years the main indoor air parameters were measured. In parallel a questionnaire to evaluate symptoms of the occupants and their satisfaction was conducted.The experiment proved that the use of low emitting building materials, along with a high quality control of the building practices during the contruction phases, gave full satisfaction to the occupants (decrease of their symptoms during the 3 year-occupancy).With low additional costs a high IAQ can be obtained.

This article aims at precising the difference between Underfloor air distribution (UFAD) and Displacement Ventilation (DV) systems, though they both use supply air delivered into a room or space from an access floor.This article presents each system with its different way of working in applications for commercial buildings.

The purpose of that study was to quantify the effect of the variables (previously identified during the first phase of that study conducted from 1999 to 2002) concerning smoking room performance under controlled laboratory conditions.In a test chamber simulating a smoking room, 27 experiments were conducted.

DVC is a new energy saving technology, buildings that use a DVC strategy use CO2 sensors that measure and regulate the amount of outdoor air supplied to the space.Standards and local building codes have been slow to adopt it.Available data suggests that DVC reduces ventilation, heating and cooling load by 10 to 30 %.

It is a basic biological truth that people bring different levels of responsiveness to irritant stimuli to work. No one reacts to the same levels with the same intensity (symptoms are different)What are the stress factors that lead people to complain? Poor work organization, inadequate communication or pollutants ? The author suggests that priority should be given to the problems of work organisation before looking for problems of indoor air pollution, air-handling, or heating.Systematic approaches to stress management have shown to have major benefits.

The impact of the concentration of pollutants in the air on emissions from building materials is the subject of that study.Different building materials were studied in ventilated small-scale test chambers. The experiment allowed the changing of the dilution factor or the changing of the area factor.The results showed that more ventilation in a given space may increase the emissions from the inner surfaces.