There has been lack of fact based knowledge for design and operation of supply air jilter for general ventilation. An Invent multi-component project was started in 1994 to tackle this problem area. The paper describes the basic performances of air filters and requirements to be included in the Design Guide Handbook, managed by Invent, Finland.
A technique has been developed to estimate the equivalent leakage area needed in residences to provide a quantity of infiltration-driven air exchange which exceeds a design value for a desired level of frequency of occurrence. The technique presented applied an air infiltration simulation model to hourly long term weather data to provide hourly estimates of the infiltration weather factor. Cumulative frequency distributions (CFD) were then used to describe the distribution of these data when 1-, 3-, 6-, 8-,12-, 24-, and 48-hour time periods were grouped together.
Combustion gases from diesel engines of trucks accumulate in the apparatus rooms of fire stations when fire trucks and emergency vehicles leave for or return from an emergency run. The situation is most extreme when fire trucks leave for an emergency run. All doors are closed for security reasons and combustion gases become trapped in closed apparatus rooms. These gases can migrate to the living quarters located next to the apparatus rooms, causing discomfort or potential health problems for personnel returning to the building.
The CIBSE is to publish new guidance on environmental criteria later this year. This includes new material on Indoor Air Quality which provides a strategy for minimising indoor air quality problems in buildings and improving the effectiveness of outdoor air supply in controlling indoor pollution. This Chapter explains the reasons for this approach and the basis for the guidance given.
A cross-sectional study was carried out to investigate the occurrence of the sick building syndrome (SBS) among office workers in Mauritius. A walk-through inspection and a questionnaire survey were carried out in 21 office building complexes to evaluate the prevalence of risk indicators for SBS symptoms among 302 office workers. Indoor climatic variables monitored were: carbon dioxide, carbon monoxide, nitrogen dioxide, air temperature, relative humidity, air movement, noise and light. All data collected were analysed using the EPl-info software.
Good indoor air quality (IAQ) enhances occupant health, comfort and workplace productivity. This issue has become more critical in a country like Singapore that has no other natural resources except manpower. In addition, Singapore is located in the tropical region with a hot and humid climate and a large number of the buildings are served by air-conditioning and mechanical ventilation (ACMV) systems to maintain a thermally comfortable indoor environment. The provision of a thermally comfortable indoor environment for the occupants is only one aspect in achieving better indoor air quality.
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