The air exchange rate is a determinant factor for the indor air quality in a given spaces. If it is lower than the required it may cause the so caled sick building syndrome. The ultimate result depends, obviously, also on the nature and strength of the sources emisions. In this work the natural
An experimental study was conducted in a field environmental chamber with the aim of comparingceiling-based mixing ventilation (MV) system and under-floor supply system (UF) from the perspectives of indoor air quality and thermal comfort. Six tropically acclimatized female subjects participated in the experiments and they were required to complete a set of questionnaire pertaining to IAQ and thermal sensation every 20 minutes during each exposure of 2 hours.
An experiment was carried out to determine the effect of photocatalytic air cleaning on perceivedair quality. Thirty-eight subjects assessed the air quality in a low-polluting, 108 m3 office, with pollution sources either present or absent behind a partition. The pollution sources were carpet, linoleum and chipboard. The office was ventilated with outdoor air at 0.6, 2.5, and 6 h-1. The air temperature was 22C and the relative humidity 40%.
The perceived intensity is investigated by a trained group of 10 to 15 persons. Until now fieldstudies have to be made at the location of interest. All members of a trained group have to visit e.g. a building in order to estimate the perceived intensity of the indoor air. The trained group is influenced by the local environment. This paper presents a new method to sample and to store air probes at arbitrary locations. The air probes can then be transported to the laboratory where a standard group test can be made in the neutral and clean environment of an air quality lab.
Amongst various sources of polluting substances the open space gas-range have an impact onthe quality of living spaces. Carbon-dioxide and nitrogen-oxides occurring during burning considerably impair the air quality. Emission of polluting substances has been examined in the Laboratory of Air Quality of Dept. of Building Service. The results of the research supported by the Ministry of Education (T0375 96) will be presented here.
In the light of ever increasing oil prices and rapidly depleting fossil fuel resources, energyconservation strategies in buildings become popular and necessary design goals. However, it is important to note that resulting poor ventilation in the occupied zones at part-load operating conditions or even unanticipated peak-load conditions due to a different occupancy pattern can often lead to major problems associated with poor Indoor Air Quality (IAQ).
A detailed study using Computational Fluid Dynamics (CFD) was conducted on the influenceof the difference in the effective diameters of air supply outlets (wind velocity, assuming the airflow rate to be constant) when using personal air conditioning with isothermal air currents. A method to analyze the new age of air (SVE3*) and the residual lifetime of air (SVE6*) was proposed and studied focusing on the individual supply openings and exhasut openings in a room with multiple supply openings and exhasut openings when using personal air conditioning.
This paper reports experimental study of air quality in the kitchen of the CSTB experimental house MARIA. These experiments are transition between measurements in an experimental cell and in situ measurements. Indeed, ventilation conditions are controlled via either a hood or via a mechanical ventilation at the exhaust. The kitchen studied is also equipped with a pan on an electric cook-top which temperature is controlled. However, unlike measurements in test cells, wall temperatures cannot be controlled. Impact of cooking vapour on indoor air quality is analyzed using a tracer gas (SF6).
For the application of personalized (PV) in practice, it is important to recognize its performance under realistic conditions as they apply in rooms. In this paper results of both CFD simulations and laboratory measurements are reported regarding the local ventilation effectiveness with personalized ventilation. It was observed that the personalized air influences only a limited microenvironment at the workstation. Then a new model was proposed to evalate the indoor air quality in the entire space with varied distributions of occupants.
Airflow characteristics in ventilated and air-conditioned spaces play an important role to attain comfort and hygiene conditions. This paper utilizes a 3D Computational Fluid Dynamics (CFD) model to assess the airflow characteristics in ventilated and air-conditioned archeological tombs of Egyptian Kings in the Valley of the Kings in Luxor, Egypt.
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