The European AIRLESS project was conducted by 12 organisations between 1998 and 2000, with the objective of improving the control and performance of heating, ventilating and air-conditioning ( HVAC ) systems, the first phase being to study the causes and control of air pollution originating from HVAC systems. In comfort ventilation systems, filters and ducts were the most common sources of pollution, particularly odours. When present, humidifiers and rotating heat exchangers were also pollution sources, particularly when they were not properly constructed and maintained. Air flow rates had little influence on the perceived air pollution level. Control of pollution is discussed in terms of: use of suitable filters for the fresh and re-circulated air systems; and strategies for the system controls, including the hours of operation and the use of lower air temperatures and relative humidities. 44 refs.
Primary author(s): Bluyssen P M;Cox C;Seppanen O;de Oliveira Fernandes E;Clausen G;Muller B;Roulet C-A
Vol.38, No.2, February 2003, p.209-225