| For a long time, most people increase the outdoor ventilation intuitively to improve indoor air quality. However, in recent years, some of outdoor air pollutants have exceeded the indoor air quality control indicators, direct introduction of fresh air can not only play a dilution effect, but also may worsen the indoor air quality. Obviously, the outdoor air pollution has become one of the important factors that affect the indoor air quality. However, the relationship between indoor and outdoor pollutants concentration is still unknown, the test and calibration of the dust test instrument is not perfect, and the simulation of the aerosol composition can’t reflect the real situation of atmospheric particulate matter in our country. It’s not sure the indoor pollution situation, so appropriate optimal control scheme can’t be made.In order to understand the evolution relationship of indoor and outdoor pollutant concentration, to master and evaluate the pollution status of indoor environment correctly, to provide the application model and control strategy of indoor air quality prediction, this paper mainly carried out the following work:1. Dust measuring instrument calibration system and calibration process were built, and a mathematical model of uncertainty of calibration results dust measuring instrument was established to analyze the influence factors of the calibration of dust testing instrument.2. In addition to NaCl, KCl standard solution specified in the relevant standards, the new aerosol solution, including single component ((NH4)2SO4, CuSO4) and multi component compound were put forward; ability to meet the requirements of the test aerosol were verified from the correlation, particle size distribution, dispersion and other aspects; influence of jet pressure and mass concentration on the particle size distribution and geometric standard deviation of all kinds of aerosol particles were obtained. The results indicate that particle spectrum distribution of new artificial dust aerosol including one component and multi-component are accord with the Gaussian distribution, and the aerosol particle geometric standard were less than 1.15, mono-disperse; the correlation coefficient R2 between (NH4)2SO4, CuSO4 and standard aerosol KC1 were 0.9948 and 0.9915, and the correlation was very good; to introduce Ca2+ and obtain multi-component aerosol, two different ways were used, both were mono-disperse aerosol, and the dispersion degree of aerosol with method 2 was larger than that of the aerosol with method 1, but the correlation coefficient, R2=0.9229, with the standard aerosol is slightly worse than the correlation coefficient, R2=0.9856, between KCl with aerosol method 1.3. The single room model was established, and the diffusion of the particle concentration in the indoor and outdoor were simulated; the permeability of the particles in a self-built three bedroom test room with different function rooms including living room, bedroom, master bedroom and study room, were measured using cigarette dust as atmospheric dust, and found that the measured results were in good agreement with the simulation results.4. Indoor and outdoor particulate matter concentration of some typical public buildings (basketball hall, hotels, shopping centers, research center, commercial office, apartment buildings and villas) in Beijing were carried out actual monitoring analysis; indoor and outdoor PM2.5 quality concentration correlation was obtained, and the influence of the purification device on the indoor particle concentration was compared, what’s more the reliability of the simulated test was verified by the measured data. |
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