Study On Indoor Pollutant Particles Motion Simulation And The Optimizing Control Of Air-conditioning System

Indoor air quality has become a serious problem.People start to make multiple solutions no matter they are professional HVAC researchers or ordinary residents,both of which includes scientific solutions and random shots.However,from the scientific point of view,the control the indoor air quality should be focused on the research subject:indoor air pollutant.Researches were made to get results of indoor air pollution and the way to control it.First of all,methods of controlling indoor air quality are categorized into two kinds which are air-conditioning choosing and airflow distribution choosing.And then it is demonstrated in the paper that how equipment installation affects the control of indoor air quality.Finally,studies have been made that how automatic control system designing,equipment maintenance and system recreation are related to the control of indoor air quality.Theoretical basis has thereby been provided to control air quality of a room equipped with an air-conditioner.The main subject of this paper is spray aerosols caused by breathing,speaking,coughing,sneezing and other respiratory behaviour.First of all,the paper starts with the classic force model,analysing on the condition of moving spray aerosols and turning mathematical and physical models into computer programming language.After the settling of each physical parameters of the spray aerosols while spraying and moving,the definite value of each kind of force has been calculated.Therefore,the validation of each kind of force has been proved,which makes spray aerosols force models match with the following research conditions.And then,the movement of spray aerosols are categorised into two kinds which are spray from mouth and diffusion in airflow organization.The movement models of spray aerosols are established,while MATLAB/Simulink platform is used to simulate condition of spray aerosols.The longest distant of spray aerosols with different diameter is calculated under different designed conditions.The idea of safety diameter was raised to set the foundation of the upcoming research.This paper also considers the outside particulate matters as the main subject with the condition of non-ventilation,fan coil with fresh air and mixed air ventilation.According to quality conserving principle,the concentration models of the three conditions above are established.The simulation parameters are also determined through experiments.MATLAB/Simulink platform is also used to analyze the concentration of indoor particulate matters under different airflow parameters with the methods of lumped parameters.The idea of safety diameter was used to analyze the impact on the people indoor physically by the indoor particulate matters.Because the lumped parameter model of indoor particulate matters could not reflect their distribution,CFD simulation method was therefore used to simulate the distribution of indoor particulate matters.First of all,the equipment of air conditioning was simulated through the established models,and the simulated results were directly drawn by CFD simulation software as the boundary conditions.The whole simulation process was completed through the equipment-end and user-end.The indoor particulate matters concentration distribution is obtained by the simulation,which is the guidance to controlling indoor air pollutants.At last,the experiments are conducted to exam the results of the simulation,which turns out to be a total success.