| The dynamic change of indoor environment will make people’s state change accordingly,people pursue a relaxed and satisfied indoor environment,so as to increase the activity of people’s brain,so as to improve work efficiency.Stratum ventilation is a small office environment well,a new type of ventilation way,therefore,to explore the reasonable form of tuyere and air supply parameters can improve the indoor environment of air distribution,optimize the indoor environment,raise the satisfaction of human body of indoor environment,improve air quality,achieve energy saving,comfortable and healthy.This paper analyzed the influence of multiple air supply parameters on indoor environment and human comfort under the stratum ventilation mode,and used the research method combining experiment and numerical simulation to carry out the research on the stratum ventilation.Through the experimental method,the single tuyere air supply and double tuyere air supply,the return air outlet was arranged at the top,the experiment of changing the angle of the air supply outlet,the temperature value and the speed value of the cross section of the room were measured,and measure indoor temperature distribution,temperature non-uniformity coefficient and vertical temperature difference between head and foot,PMV/PPD index were analyzed;Secondly,the condition of 0° air supply was selected to conduct experiments on the layout of air supply outlets,namely,single tuyere air supply and double tuyere air supply.The temperature value and velocity value of the section in the room were measured,and measure indoor temperature distribution,temperature non-uniformity coefficient and vertical temperature difference between head and foot,PMV/PPD index were analyzed.Experimental results showed that :（1）When the air was supplied by a single tuyere,the vertical temperature value increases with the increase of height.As the deflection Angle of supply air increased,the average temperature at each height was lower than 0° supply air temperature.When the air supply Angle was 30°,the temperature uniformity in the working area was the best.When the air supply Angle was 0°,the average vertical temperature difference between head and foot of the four columns around the human body was the smallest.When the air supply Angle was 0° and30°,PMV was closest to 0 and PPD value was the smallest.The thermal comfort of human body was suitable.Considering the uniformity of temperature distribution and the comfort of human body comprehensively,the optimal condition of single tuyere air supply were 0°and 30° angle air supply.（2）When the air was supplied by two tuyere,the vertical temperature value increased with the increase of height.At the A-A section perpendicular to the air outlet,the temperature distribution in the working area was the most uniform when the air supply Angle was 0°,and the average vertical temperature difference between the head and feet of the four columns around the human body was the smallest.At this time,PMV was closest to 0,and the thermal comfort of the human body was more suitable when the PPD value was the minimum.Therefore,when the air was supplied at the double outlet,the air supply at the angle of 0° was the best working condition.（3）When the air supply angle was 0°,the distribution of single and double air supply outlets was compared,and the temperature inhomogeneity coefficient of A-A section was close to that of single and double air supply outlets.The temperature distribution on the B-B section of single-side tuyere was more uniform than that of double-side tuyere,but the vertical temperature of the pusher feet of double-side tuyere was less than 3℃,and the PMV value of double-side tuyere air supply was smaller,which made more satisfied people and better comfort.Through numerical simulation,the angle of supply air and the height of return air inlet are controlled.FLUENT software was used to analyze the indoor temperature field,velocity field and the non-uniformity coefficient of temperature and velocity.The simulation results showed that :（1）With the increase of air supply angle,the average indoor temperature decreased gradually.The air supply angle was 15°.The heat around the body and the air supply flow had good heat exchange.The wind speed near the air supply and return vents was large.As the height of the return air increased,the air would flow upwards,so that the air supply could not be used effectively.The increase of the air supply angle made the average wind speed in the indoor working area increase first and then gradually decreased.（2）The average temperature of the working area decreased with the increase of the height of the return air outlet.With the increased of the height of the return air inlet,the average velocity in the working area had no obvious law distribution.The height of the return air outlet increased,the average temperature of the working area increased,the higher the return air outlet height was,the more disorderly the temperature distribution in the working area was.When the air supply angle was 0 °,the average velocity non-uniformity coefficient in the working area was the maximum when the return air outlet height was 0.5m,and the minimum when the return air outlet height was 0.3m.When the air supply angle was 15°,30°,45° and 60°,the average velocity non-uniformity coefficient of the working area at each return air outlet height was close.To sum up,when the return air outlet was located at the upper part and the single-side air supply mode was adopted,the recommended air supply angle of 30° was more comfortable;When the return air outlet was located at the upper part and the air supply mode with two side tuyere was adopted,the recommended air supply angle was 0° and the comfort was higher;When the return air outlet was located at the top and the air was supplied by two side tuyere,the horizontal air supply（air supply angle 0°）has better comfort;When the air supply and return ports were arranged opposite each other,it was recommended that the height of the return air port be 0.1m,so that the indoor temperature distribution was more uniform and the average temperature value was higher. |
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