Development of ventilation system for smoking space separating by circulation flow and re-circulation flow

点击翻译按钮获取中文摘要

[Experiment]1) We designed and made the precise room model which can reproduce a variety of ventilation properties. An average velocity of the wind and various turbulence statistics amounts were measured in detail in the case of setting up the obstacle and the heat body, etc. indoors in all cases by using this precise room model, and the effectiveness to the indoor ventilation of the re-circulation flow was analyzed in detail.2) The temperature and the average velocity of the wind in micro climate around the human body by metabolic heat of the human body were measured with a thermal manikin. Moreover, the temperature gradient in the boundary layer from the skin of the body was measured by using the thermo-couple of the extra fine, and the convection heat transfer coefficient was calculated directly.[Numeric simulation]1) The above-mentioned precise model was simulated using LES and standard k-epsilon model. It was shown that an analytical result by LES agreed to the experiment very well, and had enough accuracy as a technique by which the adhesion of supply flow from slot type supply opening on the ceiling side and the range of the power the line type exhaust opening and the turn flow and the re-circulation flow can be examined in detail. Moreover, standard k-epsilon model have enough analytical accuracy, and effectiveness as the technique by which various cases were examined was confirmed in the analysis by the model.2) Passive smoking properties were simulated with a computational thermal manikin from which accuracy was verified by the experiment with the above-mentioned thermal manikin in the room. (1)Room ventilation system, (2)arrangement of the human bodies, (3)exhalation velocity of cigarette smoke from the mouth being changed, under the various environment, we analyzed the smoke diffusion properties around the human body.