Outdoor/Indoor/Personal ozone exposures of children in Nashville, Tennessee

That study was conducted in Nashville (TN) : during six weeks, measurements using passive ozone samplers were made on a group of school children aged 10 to 12 to estimate the outdoor/indoor /personal ozone exposure. Personal ozone exposure depends of the time spent indoors and outdoors.

Quantification of the effects of air velocity on VOC emissions from building materials

The effects of environmental factors can be important in simulating indoor levels of VOCs emitted from building materials. In this study the effort has been made to quantify the relationship between air movements and emissions of decane applied on an oak substrate.
The aim of this research is to determine the correlation between environmental factors and coefficients of mass-transfer based emission models in a mathematical form.

Final report on European interdisciplinary networks on indoor environment and health - EUROWORKS

In this swedish report, an inventory and a multidisciplinary review (EUROWORKS) of the scientific literature about networks on indoor environmental quality and health is made. That work was performed during 2001 and was supported by the European Commission.

Best practices for underfloor air systems

The number of Underfloor air systems (UFAD) has incresed 40 % between 1995 and 2002, thanks to the benefits it offers : lower churn costs, improved IAQ, lower energy costs, potential to reduce floor-to-ceiling heights. But knowledge of how to apply the technology is not widespread.
Design phases, construction and commissioning phases of the UFAD project are presented along with a paragraph on the importance of educating building occupants on UFAD.

Supply air CO2 control of minimum outdoor air for multiple space systems

Supply air CO2 control (SACO2) is a technique for measuring the outdoor air fraction in the supply air and controlling the outdoor air intake. It is applicable to recirculating systems serving multiple places where ventilation targets are based on outdoor airflow rate per person. SACO2 offers significant benefits : energy savings, simple maintenance, adequate ventilation and ability to measure and record performance.

Addendum 62n. Single-zone and dedicated outdoor air systems

That addendum 62n modifies the ANSI/ASHRAE Standard 62 "Ventilation for Acceptable Indoor Air Quality, it contains an update to the minimum prescribed ventilation rates and includes ventilation airflow "additivity" for dilution of people-source and building source contaminants.

Compression effects on pressure loss in flexible HVAC ducts

The aim of that study was to evaluate the effect of compression on pressure drop in flexible, spiral wire helix core ducts used in residential and light commercial applications. Tests on ducts of 6, 8, 10 in. nominal diameters were conduted under different compression configurations following ANSI/ASHRAE standard 120-1999. That study suggests potential improvements to that standard and gives new data for duct design.

Sound absorption of microperforated duct systems

Microperforated sound absorbers have been successfully implemented in suspended ceilings, transparent panel absorbers or other applications. That principle of microperforation has been introduced to further engineering areas such as duct systems where the air flows through the micorperforation. So along with the ventilation aspects, the sound absorption effects need to be taken into account. In that aim, the theory of a microperforated absorber was extended by the effects due to airflow through the microperforation.

Recalibration of the complaint prediction model

In this paper the complaint prediction model developed by Federspiel in 2000 is evaluated and recalibrated. Temperature time-series data and complaint data were collected from different size buildings from different geographical areas. Results are presented.

Using the torque characteristics of dampers to measure airflow, Part 2 : analysis and testing

Thanks to an uncertainty analysis, the demonstration has been made that the APT method can, over a wide range of conditions, outperform a pitot tube, but can't do it when the damper is nearly open. Tests have confirmed the results of the uncertainty analysis.

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