Simulation Research On The Effect Of The Position Of Air Vents On The Mechanical Exhaust Effect In Residential Buildings

Nowadays,for people who are increasingly pursuing air quality and quality of life,the bathroom is not only used to solve the problem of "crapping",but also a place to relax and enjoy.The proportion of the bathroom inside the residence is getting higher and higher,but the inside bathroom is the worst part of the air sanitary environment in the residential room,most of the inside toilet smell can not be removed effectively and quickly.However,if the air quality of indoor toilet is not good,it will not only affect people's living mood,but also seriously affect people's physical and mental health.The subject investigate the air quality of residential bathroom on the way of questionnaire According to the survey results,most of the residents who resided inside the bathroom were relatively sensitive to the stench problem,most respondents thought that the smell of the inside bathroom had affected the quality of life and quality of life of the restroom.Therefore,The mechanical exhaust effect of the domestic toilet system is necessary to improve.This subject aims to use Fluent pre-processing modeling software lcem to establish a residential bathroom model,through the Fluent software simulation,choose two representative pollutants ammonia NH3 and hydrogen sulfide H2S?set the exhaust port pressure,exhaust wind speed and exhaust time and other conditions were same,the research in toilet during mechanical ventilationt,the influence of the air flow organization to change the location of the exhaust outlet,through the comparative analysis of different exhaust outlet location(ceiling center,above the toilet,below the side wall)of the concentration distribution and streamline distribution cloud chart to determine the better program of distribution of air flow.The simulation results show that,when the exhaust vent was arranged below the side wall,had the shortest path for the removal of pollutants and the minimum diffusion range of the pollutants.When the same time is excluded,the concentration of pollutants below the side wall is the lowest.In the meantime,taking into account the influence of hot pressing on the bathroom exhaust system in high-rise residences,the mechanical ventilation of typical floors during the transitionseason,summer season and winter season were simulated separately when simulating the working conditions of different locations of exhaust vent.Compared with the simulation results showed that in the spring and autumn,the exhaust time of exhaust vent on the lower side wall was shorter than the other two conventional exhaust vents(ceiling of the central and over the toilet)by 1-2 minutes;in summer,the exhaust time of exhaust vent on the lower side of the side wall was shorter than the other two conventional exhaust vents by 2-3 minutes;in winter,the exhaust time of exhaust vent on the lower side of the side wall was shorter than the other two conventional exhaust vents by 1-3 minutes.Thus,no matter what the season,the floor,the exhaust time is the shortest when the exhaust vent below the side wallDifferent seasons lead to different hot pressing effects in the same position exhaust vent and the same floor:the influence of five floors is the greatest,and different seasons can lead to a maximum of 5 minutes difference in exhaust vent working time;the influence of 17 floors is the least,and different seasons will only differ by 0-2 minutes of exhaust working time;when the exhaust vent below the side wall,different seasons affect the exhaust time by 0-4 minutes.Different floors lead to different effects of hot pressing in the same position exhaust vent and the same season:in summer,the longest exhaust time required by the 5 floors and the shortest exhaust time required by the 17 floor,both differ 1-3 minutes of exhaust time;in winter,5 floors required exhaust fan exhaust time is shortest,17 floors required exhaust fan exhaust time is the longest difference between the two 1-2 minutes of exhaust time;when the exhaust vent is below the side wall,different floors have a difference of 0-2 minutes on the exhaust time.In summary,the subject of the optimal design of the bathroom exhaust system,that is,below the side wall of the toilet set up exhaust fan,the pollutants can be discharged in time when just send out,not only greatly shorten the diffusion path of pollutants,optimized the form of air flow organization,reduces the impact of pollutants on human health,and reduces the diffusion time of pollutants and ventilation exhaust fan exhaust time,help to improve the human body comfort and toilet room air quality,and can also save the energy consumption of the exhaust system.