Three measuring techniques have been compared for evaluation of the surface duct level in ventilation ducts : vacuum test, gravimetric tape method, optical tape method. Measurements have been operated in 13 recent buildings in Helsinki using the three methods. The vacuum test gives similar values to the gravimetric tape method when air ducts show no residual oil from their manufacturing (average values 1.1 and 1.2 g/m2). With residual oil, vacuum test gives higher dust levels than gravimetric tape method. The optical tape method is the most easy to use on site.
Relationships between research about indoor and outdoor air quality are reviewed. The author mentions that outdoor air pollution has attached greater regulatory interest, although people spend more time indoors. The contribution of exposure to indoor pollutants is now more recognized but this increased consideration has little effect on regulations. Nevertheless, the author considers that indoor air quality researchers and public health officials have a lot to learn from the outdoor air quality experience, in fields such as exposure, dosimetry, health effects and risks, mixed exposures.
This study is a part of the Finnish contribution to the HYBVENT project (Annex 35 of IEA). Two 'hybrid' ventilation concepts designed for northern climates were evaluated for a 4300 m2 office building in Helsinki : one of them is low pressure mechanical exhaust with CO2-controlled air inlets ; the other uses mechanical air supply through coils and two parallel exhaust circuit with and without fan and heat recovery. They were compared with conventional systems in Finland (mechanical supply and exhaust with constant or variable air volume).
An audit of 20 hospital operating rooms was operated in Grece in order to collect information about the HVAC installations and the indoor physical parameters. Data were also collected from 560 medical personnel through a questionnaire about the assessment of the indoor conditions.
The revision of Ashrae standard 62, Ventilation for Acceptable Indoor Air Quality, began in 1991. This article gives a summary of the changes that have been approved and describes the issues that remain to be resolved.
Field measurements were carried out on six office buildings in Taïwan to evaluate ventilation efficiencies on the concentration of formaldehyde and TVOC, as well as the impact of ventilation rates on reducing these concentrations.
This study is to validate a CFD model of displacement ventilation combined with chilled ceiling and determine if this combination may create draught risk or influence badly indoor air quality.
The aim of this study is to evaluate different control strategies on ventilation in a bathroom and their efficiency. Comments are given on running time periods as well as reaction of different controls (occupation, CO2/COV, humidity).
Describes how CSTB undertook an experimental study of three schools in the Paris region to get to know the real quality of indoor air in educational buildings.
This study was based on measuring the physical and chemical characteristics of indoor climate variables in four town halls in Copenhagen in Denmark and on the odour-intensity judgements by a panel. Three of the buildings had high levels of work-related mucosal irritation and work-related general symptoms; the other one did not. There was a significant correlation between the total concentration of volatile organic compounds (TVOC), the air temperature and the panel's ratings of odour intensity and acceptability in the rooms.
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