METHOD FOR DETERMINING reduction coefficient of ventilation PREMISES FOR MEDIUM METEOROLOGICAL CONDITIONS AND EVALUATING EFFECTIVENESS aerodisperse FORMATIONS

摘要

FIELD: physics.SUBSTANCE: method of determining the reduced air change coefficient of rooms for average weather conditions and estimation of the efficiency of aerodisperse formations inside rooms involves first determining the characteristic of the room under analysis (inner volume of the room V, total surface area of leaks F). A flow coefficient µ is then determined depending on the geometric shape of the leaks and external conditions of analysis (speed U and direction of wind ?). Further, the current value of the air change coefficient Kni and aerodynamic coefficients Sg and Cx are determined. The reduced air change coefficient is then determined by reducing experimental values of the air change coefficient to average weather conditions Kn. Current concentrations C(?), formed at given moments in time ?as a result of operation of the test sample in the room, are determined experimentally and the wind speed and direction outside the room during the experiment are also determined. The value of the air change coefficient Kni during experiments is determined based on the obtained data on wind speed and direction and the initial concentration of the desired substance formed immediately after operation of the sample. The current values of concentration of the desired substance, which could have been obtained when testing the sample at average weather conditions, are also determined. Efficiency of aerodisperse formations (test sample which produces aerodisperse systems) is then estimated depending on the type of the desired substance used, technical characteristics of the dispersing device, location thereof and amount thereof.EFFECT: estimation of the value of the air change coefficient when testing samples, enabling to take into account characteristics of the facility in which the testing is conducted and weather conditions when conducting the experiment, enabling comparative analysis of test samples when reducing test results to average weather conditions.2 tbl, 2 dwg