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.

In this article, the sources of risk using DCV (demand control ventilation) are examined along with the components typically and the possible ways to minimize risk without sacrificing potential energy savings.

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.

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.

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.

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.

A framework and computer code has been developed in that study for coupling building energy and load calculations with room air models.

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.

The mathematical model described in this paper relates position, velocity and aerodynamic Torque characteristics of air dampers. That model has been has been developed and tested experimentally : the results demonstrate its accuracy.

The author, basing on the present knowledge on healthy indoor air, asks for a reenforcement of indoor environment in Europe, without delay.