Search

The natural ventilation is an easy way to exchange the indoor polluted warm air with outdoor fresh air. The wind power injects outdoor fresh air into the building. A good indoor air current and subsequently a proper exhaust depend on the openings’ conditions and their situations. A serious architectural question is under what conditions of the openings the wind-cross ventilation can be effective, and the required indoor air current in the enclosure is established. The purpose of this article is analyzing the conditions of indoor airflow in an analytical architectural model to upgrade the natural ventilation by focusing on opposite opening’s conditions. This research considers some wind driven ventilation manner with respect to openings circumstances in an assumed cubic model. The research method includes a numerical simulation using a validated computational fluid dynamics (CFD) model. It investigates and compares the performances of different models of airflow currents in a natural ventilation process and subsequently the indoor airflow paths, under the different conditions of the openings in a fixed boundary condition model; the simulations are performed in an assumed model (a 6×6×6m cubic building with just 2 opposite openings in stationary walls as boundaries of the model) by using Gambit and Fluent software. With an analytical method (using Fluent) the gathered data would be analyzed. Finally the results are presented and generalized: the results demonstrate that whatever the wind speed is, the indoor airflow condition depends on the situations of the openings. It means that the quality of wind-driven cross ventilation and its path is not depended on the wind speed. Besides for establishing proper natural ventilation, the opposite windows must not be installed in front of each other, or in the same level. [ABSTRACT FROM AUTHOR]

Providing welfare status for personnel of industrial plants is necessary and also emphasized in all standards. Preparing fresh, cool and clean air especially in warm seasons is one of the most important duties of plant owners to keep workers safe and healthy. Although in many workshops some cooling and air-conditioning systems (commonly mixing ventilation systems) were installed, most of them have economical problems and may not be energy efficient as the entire room volume gets cooled. The purpose of this article is presenting an executive improved solution in architecture to upgrade existing Mixing Ventilation Systems (MVS) by intervening in architectural variables. The new solution is compared with a traditional MVS taking into account technical and economic performances. The study was carried out resorting to experimental measurements on a single-diffuser pilot installation of the existing MVS in an actual industrial facility. The research method is experimental: the thermometry tests and interviews with workers which were carried out after initial observations and the case study selection. After that some interventions in architecture were impelled and the testes were repeated. To confirm the results, after interventions, a questionnaire was given to the operators, and their answers were registered. A comparison was fulfilled with respect to energy consumption and also the consumed power was checked before and after the interventions. The results demonstrate that architectural alterations based on this research can improve the quality of existing MVS (Satisfactions of the workers approved the interventions) and reduce the energy consumptions. It could be generalized. [ABSTRACT FROM AUTHOR]