In this paper, airflow analysis in an air conditioning room was carried out, in that aim a standard office room was taken up for simulation. temperature and velocity distribution over various virtual planes for different locations of the air conditioner blower were analyzed to achieve the maximum comfort for the occupant. That work can be extended to a more complex air conditioning system like in industries, hospitals, and huge shopping centers.

The aim of this paper is to determine the effects of the use of an electret filter on aerosol penetration. Various factors such as particle size, aerosol charge state, face velocity, and relative humidity were examined to assess their effects on aerosol collection characteristics. The results presented demonstrate that the level of penetration through the electret filter increased with increasing face velocity and relative humidity but was not affected by the temperature and the aerosol charge appeared to exert the greatest influence on aerosol penetration.

The aim of that study was to assess the level of occupational exposure to nitrous oxide in operating rooms. Measurements were carried out during surgical procedures in 35 operating rooms in 10 different Polish hospitals equipped with different systems for ventilation and anaesthetic scavenging. Air was collected in Tedlar bags, and NO2 concentrations were analyzed by adsorption gas chromatography and mass spectrometry.

In order to evaluate the effectiveness of the restrictions of the Finnish Tobacco Act, concentrations of environmental tobacco smoke (ETS) have been measured before and after the amended Act entered into force. Establishments with a serving area larger than 100 m2 were selected for that study. The ventilation rate was measured twice in each site, during peak hours , the number of guests and cigarettes smoked were counted. Then the air samples were analyzed by thermodesorption, gas chromatography and mass spectrometry.

Casting fumes lower the air quality in foundries. So a local ventilation solution for the mould casting area was designed and dimensioned with CFD calculations. The most efficient solution appears to be a push-pull ventilation system. A prototype was built and tested in actual operation foundry. The capture efficiencies with push jet were determined by the tracer gas method, they varied between 40 and 80 % in function of the distance between the source and the exhaust.

The characterization of profiles and concentrations of emitted volatile organic compounds (VOCs) when essential oils evaporate indoors, is the aim of that study. Lavender, eucalyptus and tea-tree were tested on a nation-wide questionnaire survey. Specific aromatic compounds were sampled and analyzed by GC-MS. Particulate matters, CO, CO2, TVOCs were measured in real-time. The results show that only the PM level did not increase after the evaporating of the essential oils and high emissions of terpene were observed.

The investigations of IAQ and thermal comfort were performed by combining CFD simulation of the 3D air flow and a multi nodal humanbody thermo-regulation model. New characteristics of the three typical air distribution designs (mixed ventilation, displacement ventilation and personalised ventilation) are revealed in their results.

The aim of this paper was to investigate during working hours, atmospheric particle size distribution and number concentrations in three naturally ventilated offices and outdoors to study the indoor-outdoor atmospheric particulate matter relationships. It appears that construction activities in the vicinity, movement of people indoors, computer operation, environmental tobacco smoke, re-suspension, and meteorological conditions with respect to office orientation have a significant impact on indoor PM number concentrations.

The research of the frequency of risk factors for sick building syndrome in indoor working places in Istanbul was the aim of that study. A questionnaire was fulfilled by the employees of 50 non-governmental bank offices, and measurements were carried out. The results of findings of SBS are analyzed.

In this study, the subjective responses of office occupants with respect to indoor CO2 concentration allowed the evaluation of the acceptability of IAQ in air-conditioned offices in subtropical climates . CO2 concentrations were measured at 396 sample locations and occupants' responses were recorded by an electronic questionnaire.A logistic regression model described the overall acceptability of IAQ by all the occupants. The correlation with indoor CO2 concentration is shown.