Research And Optimization Simulation Of Ventilation Performance Of Small Sound-proof Conference Room

With the development of society and economy,people’s demands for protecting business secrets and personal privacy in business activities and daily life are also increasing.Stimulated by this demand,a detachable small soundproof conference room was born.The conference room is composed of prefabricated standardized components,which can be temporarily constructed and dismantled as needed in the original building room.However,due to the special requirements of sound insulation,conventional ventilation methods such as opening windows and installing ventilators cannot be used,which makes the conference room relatively closed and densely populated.At the same time,the heat emitted by people and the metabolic waste generated by breathing will seriously affect the thermal comfort and air quality of the room.Therefore,how to optimize the ventilation system and improve the air quality and thermal comfort in a small crowded space under the constraints of sound insulation has become the focus of research.This article first measured the ventilation system of the original small soundproof conference room in three different ventilation conditions:natural penetrating ventilation,indoor ventilation with high CO₂ concentration and indoor CO₂ with low concentration.Analysis of the changes in indoor temperature and CO₂concentration has its shortcomings.Then,based on the derivation formula of comprehensive ventilation theory,the effects of factors such as room volume and outdoor CO₂ concentration on indoor pollutant concentrations were analyzed.Based on this,according to the HVAC design manual,the indoor heat and humidity load and air supply volume were calculated,and factors such as thermal comfort,air quality,and energy saving were considered to determine a reasonable range of air supply parameters.Aiming at such a small and densely populated space,on the premise of meeting the constraints,three airflow organization schemes using ventilation slots for air supply were designed.After the turbulence model was verified,the three kinds of airflow organization schemes were simulated by CFD using the RNG k-εmodel with higher accuracy.After comparing and analyzing the simulation results,and combining with evaluation indicators such as ADPI,ventilation efficiency,air age,and PMV-PPD,it is determined that the fixed-point air supply form is the best air supply plan.Based on this,the air supply structure is further optimized.Considering that the height of the air supply port and the air supply angle are mutually coupled,the analysis shows that the optimal air supply structure is the air supply port height of90cm and the air supply angle of-15°.Then compare the indoor thermal environment under different air supply parameters.The best air supply parameters are the air supply temperature of 19℃and the air supply volume of 225m³/h.