Study On Air Quality Control Technology Of Haiwo Underground Mall

With the improvement of people’s living standard, the demand for the environment is getting higher and higher.Air quality is particularly important in densely populated places.Air quality has a direct impact on the people’s safety and health.The quality of air in densely populated places of the research personnel is of great significance to the health of human body.This paper takes the underground mall in the HaiWo area of Huai Nan city as the research object.To research the temperature, humidity, wind speed, CO2 concentration, formaldehyde concentration, TVOC concentration and so on at the site. It is found that the temperature and wind speed in the market are not uniform. The maximum temperature 28.2 degrees Celsius and the minimum temperature 23 degrees Celsius, the temperature difference is 4degrees Celsius,maximum wind speed reached 0.4m/s and local 1923ppm reached CO2.From research we found that local wind speed over 0.3m/s,local CO2 reached 1900ppm,it is greater than that of the Indoor Air Quality Standard specifications.According to the above, the design and research are carried out according to the problems existing in the field.we would use the professional air flow and heat transfer solver of numerical simulation software Airpak to model the physical dimensions and concluded that temperature,speed,CO2concentration in existing air conditioning system air distribution modes,The maximum temperature 28 degrees Celsius and the minimum temperature 24 degrees Celsius, the temperature difference is 4degrees Celsius,and simulation results show that the ventilation mode on up-supply up-return basically coincide with the actual test results.We choose improve the existing ventilation mode,we select ventilation mode of up-supply down-return, up-return down-supply to research the temperature, humidity, wind speed, CO2 concentration, mean age of air concentration and PMV、PPD concentration.After the research,we get the following results:(1)From the speed concentration we can get that the up-supply up-return and up-supply down-return ventilation modes are cause speed concentration uneven.down-supply up-return ventilation maximum wind speed is 0.25m/s, less than 0.3m/s.(2)From the temperature concentration, we can get that the up-supply up-return and up-supply down-return ventilation modes are cause temperature concentration Stratification phenomenon.and when use up-down up-suppy ventilation mode show that maximum temperature 25 degrees Celsius and the minimum temperature 23 degrees Celsius, The temperature difference is less than 2 degrees Celsius.(3)From the CO2 concentration,we can get that only the up-supply up-return ventilation mode can produce a large number of CO2,the up-supply down-return and up-return down-up the highest concentrations of CO2 were 823ppm,525ppm,and not make this phenomenon.(4)From the mean age of air concentration and PMV, PPD concentration,we can get that the ventilation mode of up-supply up-return mean age of air concentration is the longest,the ventilation mode of up-supply down-return mean age of air concentration is the second,and the ventilation mode of up-supply down-return mean age of air concentration is the shortest.the up-supply up-return and up-supply down-return ventilation modes in the outlet and the nearby there are different degrees of satisfaction is higher and part of the regional thermal,but the up-return down-up not this phenomenon.To research the temperature, humidity, wind speed, CO2 concentration, mean age of air concentration and PMV、PPD concentration we can get that the ventilation mode of up-return down-up is suitable for engineering practice.