The article presents a method for determining the size of supply and exhaust openings to ensure effective aeration of the barn in calm weather. The results of multivariate calculations of ventilation air flow rates in two modes are given: with the organization of slot ventilation and full opening of the supply openings.
The article presents a method for determining the required air exchange for the assimilation of excess heat, moisture release and carbon dioxide input from animals. The results of multivariate calculations of air flow rates at different angles of opening of gravity vent in the warm season are presented. It was found out that when performing slot ventilation with a sash opening angle of less than 5?, it is impossible to effectively remove excess heat in the room.
The average percentage of high-rise residential buildings in Russia is approximately 5% from the general volume of house construction. However, the demand for this type of buildings begins to increase. This factor relates to establishment of coherent multifunctional living environment with complex infrastructure. All of this facts cause the problem of high-rise building construction, including the design of engineering systems. Building air mode is influenced by external pressures applied to the centers of air-permeable openings, including wind pressure. Wind speed increases in the height of the building, but this change is often neglected in multi-storey houses, of course it is necessary to take this phenomenon into account designing high-rise buildings. The article presents various methods of accounting wind speed change in height, which were calculated for different cities in Russia. According to the of wind speed results obtained, the specific rate of infiltration air has been calculated, which significantly exceed the values in the case of a constant speed.
The choice of air distribution scheme is the most important task which determines indoor air quality, comfort thermal mode of the room and effectiveness of ventilation systems. The article presents comparative analysis of displacement and mixing ventilation systems for large premises. The methodology of the study is based on existing theoretical provisions and standard calculation approach of supply air jets. Multivariate calculations of mixing air distribution in cinema hall are presented. Horizontal jets along room surfaces can not provide required air velocity. In the case of vertical air distribution relative jet area beyond the recommended values. This factor had thus determined the possible formation of circulation contours with high concentrations of harmful emissions. The results of the calculation shows that the speed of the fan jet at the entrance of occupied zone lower than maximum permissible air mobility. The required temperature is achieved by using all air-distributing units considered.
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