![]() It was found that except in the big room having 8 m×6 m flooring, natural ventilation from the airflow window can satisfy the thermal and relative humidity conditions in the international ventilation standard except for the American Society of Heating, Refrigerating and Air-Conditioning Engineers. Then, the local and average temperature, relative humidity, velocity as well as CO2 and dust concentration were extracted from simulation results and compared to criteria in international ventilation standards. ![]() Both natural/mixed ventilation methods were studied and the full heating load as well as contaminant sources in the office rooms considered. The concluding remarks and recommendations are presented.Ībstract In the present study performance of an airflow window in removing contaminants as well as providing thermal comfort for the occupants was investigated. The findings of the European adaptive comfort showed that less than 50% of office hours appeared in category III with cross-ventilation. Such an achievement requires full and quarter window openings in the cases of 10% and 25% window-to-floor ratios (WFR), respectively. For a fully glazed wall, a 10% window opening could provide all the office hours inside category I of CO 2 concentration. The results indicate that when windows were opened, the first-floor zones were subjected to the highest CO 2 levels, especially the north-facing window in the winter and the south-facing window in the summer. The assessments of indoor carbon dioxide (CO 2) concentration and adaptive thermal comfort were performed using the British/European standard BS EN 15251:2007. An experimental method of computational modelling and simulation was applied. This study attempts to address the "indoor air quality-thermal comfort" dilemma of naturally ventilated office buildings in the Mediterranean climate through the effective use of early window design. Natural ventilation through window openings is an inexpensive and effective solution to bring fresh air into internal spaces and improve indoor environmental conditions.
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