Numerical Simulation And Energy Consumption Analysis Of Formaldehyde Diffusion In Indoor Environment

Based on FLUENT simulation software,RNG k-ε model combined with wall function method and pollutant diffusion model based on Species(Species Transport)method was used to conduct formaldehyde diffusion simulation and experimental comparative study in indoor environment.Firstly,the simulation study of formaldehyde diffusion in the indoor airtight condition was carried out,and experimental verification was conducted to prove the accuracy and reliability of the selected numerical model.Secondly,air distribution in the summer fresh air system room and the indoor formaldehyde gas pollutant diffusion were simulated.Through the indoor air quality evaluation index to analyze the indoor air quality,the formaldehyde concentration field on different side up supply and down return was obvious and uniform,and the ADPI value was the highest,the highest degree of human comfort;The same side up supply and down return,the coefficient of uneven distribution was smaller,and the airflow was more uniform;the energy utilization coefficient and ventilation efficiency of replacement ventilation were higher,and the sewage and heat rejection capabilities were stronger;the ADPI value of top supply and down return was the smallest,and the air The uneven distribution coefficient was large and the comfort was poor.Further research on different side up supply and down return was carried out to change the air supply speed,supply air temperature and relative humidity.The results show that: increasing the air supply speed can effectively eliminate indoor formaldehyde;indoor temperature and humidity increase is conducive to formaldehyde release;the air speed of the fresh air system should be controlled at about 2 m/s;Air temperature should be between 26～28 ℃;Relative humidity of air is adjusted to about 50%.Finally,under the premise of ensuring the same formaldehyde concentration,the energy consumed by the fresh air system to reduce indoor formaldehyde at low concentrations is much greater than the energy consumed when the indoor formaldehyde is at high concentrations.The relative humidity of the supply air is increased from 40% to 70%.the temperature is increased from22 ℃ to 28 ℃,the energy consumption of the fresh air system is reduced by 34.62%.and 28.4%.Figure 52;Table 21;Reference 68...