A ventilation system effective to solve the SBS problems has been developed : it consists in a circulating ventilation system with air cleaning units that reduce indoor contaminant concentration without increasing the amount of air supply. The aim of that study is to determine the formaldehyde and VOC removal rates of that ventilation system. A constant-emission test in environmental chambers has been used for the experiments.

Photoacoustic spectroscopy (PAS) and the tracer gas techniques were used for the testing of indoor air quality and ventilation in nine Spanish office buildings during a 15 day period in May. Those experimental results have been analysed and conclusions are presented in this paper.

That study investigated the possibility of using a regenerative desiccant rotor for air purification.A laboratory study was carried out in a climate chamber, a dehumidifier with a silica gel desiccant rotor was installed within it to treat the recirculation airflow.A Proton-Transfer-Reaction - Mass Spectrometry (PTR-MS) gas analyzer was used for the measurement of VOCs concentration upstream and downstream of the desiccant rotor.The experiment confirmed that indoor humidity has little influence on the effectiveness of VOC removal by a desiccant rotor and that this technique is efficie

This paper points out the benefits of on-going testing of building materials. This allow to learn more about the decay or rise of building-related and occupant-related indoor air chemicals. Results, discussion and lessons learned from those product testing, source evaluation and air sampling are presented.

Measurements of physical, chemical and microbiological parameters were carried out in three classrooms of a school in Porto. They were conducted in winter, spring and summer twice a week. The results are presented. Low ventilation and high number of students per classroom are responsible for the high concentration of CO2.

This paper sums up the findings from three current analyses of BASE data. Using multivariate logistic regression models, the authors found increasing occupant symptoms associated with building related factors. The method, results and discussion are presented.

For that IAQ evaluation in a 75 storeys office building, the authors used three indicators (CO2, TVOC, PM10) to assist the building engineering management in the identification of possible improvement measures in indoor air quality control

Research in 88 central Florida commercial buildings during the last decade has found that 26% of the air distribution systems had substantially unbalanced return air. Unbalanced return air occurs when there is a restriction to airflow between the supply discharge and the return air, creating positive and negative pressure fields throughout the building.

Field research performed in 70 central Florida homes found that return grilles are almost always located in the central zone of the house and that individual rooms rarely have ducted returnair or return transfer pathways. When interior doors were closed, the closed rooms went to +0.0249 inches of water gauge (in. w.g.) (+6.2 pascals [Pa]) wrt outdoors (wrt = with respect to) and thecentral zone went to 0.0116 in. w.g. (2.9 Pa) wrt outdoors.Room pressures as high as +0.150 in. w.g. (+37.3 Pa) and central zone pressure as low as 0.059 in. w.g. (14.7 Pa) wrt outdoors were found.

The objective of this field investigation was to compare the impacts on thermal comfort due to vertical location of return air inlets in a residential forced-air system operating in the cooling mode. Design guidelines for forced-air cooling systems recommend placing return air inlet locations above
the occupied zone in order to improve circulation of stagnant air and reduce thermal stratification. A companion study of the heating mode is under way. Results from the research will be used to recommend optimal return air inlet locations for yearround performance.