English

The aim of the present study is to characterize, experimentally, the effect of dust loading on coil performance for HVAC applications when employing different filter-coil combinations. The results of experiments carried out on different combinations of five types of filters of varying efficiencies (MERV4, 6, 8, 11 and 14) and four types of evaporator coils with depths and fin geometries under clean and fouled conditions, are presented along with the conclusions of the authors.

Essential oils are one means to prevent microbial development, and are low in toxicity. The authors selected a pathogenic test strain and followed the Afnor NF T72-282 standard in the aim of proposing an indoor purification method based on the germicidal and odorant properties of essential oils. The protocol was both applied to one of the most active essential oils, mountain savory, and to a solution of formol, a chemical reference in hospitals.

The authors compared first the natural ventilation flows established by a range of heat source distributions at floor level, then demonstrated that modelling the ventilation flow driven by a uniformly distributed heat source is equivalent to the flow driven by a large number of localised sources. For the transient flow development in a room with a uniform heat distribution, a model has been developed then compared to existing ones for localised buoyancy inputs. Results are presented.

For that study, indoor and outdoor carbonyl concentrations have been measured simultaneously in 12 urban dwellings in Beijing, Shanghai, Guangzhou and Xi'an, during summer and winter. The most abundant indoor and outdoor carbonyl species found were formaldehyde, acetaldehyde and acetone. The dwellings with tobacco smoke, incense burning or poor ventilation had significant higher indoor concentrations of carbonyls. It appears too that the indoor levels of carbonyls are higher in Chinese dwellings than in other countries.

This paper presents the development of an updated approach to determine simultaneously the effective air exchange rates (AERs) , the interzonal flows, and VOC concentrations over long and representative test periods. Those critical ventilation parameters affect thermal comfort, air migration and contaminant exposure in buildings and other environments. For the measurements perfluorocarbon tracer gas techniques (PFT), the constant injection rate method and adsorbent-based sampling of PFT concentrations were used.

The Swedish navy has operated submarines equipped with air independent propulsion that can stay submerged for long periods. The aim of that study is to investigate the air quality wtihin those submarines during the long periods of submersion. Results for a number of air qualiy parameters obtained during more than one week of continuous submerged operation are presented.

The aim of that paper is to study the effectiveness of building air handling units (AHUs) in serving high volume sampling devices for airborne bacteria and viruses. According to Ashrae standard 52.2.-1999, an HVAC test facility was built and used for the controlled loading of HVAC filter media with aerosolized bacteria and virus. A choice of non pathogenic bacteria and animal viruses were nebulized in separate tests and injected into the test duct facility upstream of a MERV 14 filter.

The aim of that population-based cross-sectional study was to assess the relation between the exposure to carbonless copy paper (CCP), paper dust, and fumes from photocopiers and printers (FPP) and the occurrence of sick building syndrome(SBS) related symptoms, respiratory infections and chronic respiratory symptoms.

The investigation of the performance of floor-supply displacement ventilation with swirl diffusers or perforated panels under a high cooling load is reported in that paper. Numerical simulations using a CFD program previously validated, were performed to evaluate the performance of such a system for a large workshop. The impacts of several parameters on the environment were investigated too.

The contaminant efficiency of a ventilated ceiling used in kitchen has been determined as function of type of ventilation and air flow rate. The pollutant capture and containment efficiency can be 85-93 % using the concept of low velocity ceiling supply and centralised capture jet, and is as high as 98 % when combined with displacement ventilation at floor level.