Design Of Equivalent Ventilation System For Indoor Air Quality

Air quality will not only affect people's work efficiency,but also affect people's health.Both cabin air quality and building air quality have received more and more attention.Therefore,it is of great significance to design a ventilation system which can ensure comfort,health and effective use of energy.This paper aims to design a ventilation system to minimize energy use while ensuring indoor air quality.The ventilation system is designed from the aspects of air supply scheme,ventilation mode,air supply parameters and air distribution.Firstly,a well mixed solvent diluted solute model was established to simulate the variation of pollutant concentration with time in a certain volume space.The equivalent dilution equation is derived and different ventilation schemes of equivalent air quality are calculated.The best ventilation scheme and its existing range are determined by time ventilation efficiency.By optimizing the air supply scheme,about 16.7% energy loss is saved under the condition of ensuring air quality.The conclusion can be used in the analysis of air supply system in cabin.After the ventilation scheme of space is determined,the ventilation efficiency of different ventilation systems is analyzed.The steady-state and transient spatial ventilation efficiencies of different air supply modes are determined by solving the continuous differential equation of a singlechamber and two-zone mixed model.The results show that the displacement ventilation system has good performance both in ventilation efficiency and space ventilation efficiency.Next,a ventilation system air is designed for a certain space,and the energy consumption is calculated.After synthesizing the international IAQ evaluation index,an indoor IAQ evaluation which meets the national standard is established to quantify the indoor air quality.Combining IAQ and energy consumption,reasonable air supply parameters are designed.Finally,numerical simulation of air distribution in a space is carried out.The temperature field,velocity field and pollutant concentration field are simulated,and its comfort and safety are analyzed.By changing the air supply parameters to simulate several working conditions,the influence of each air supply parameters on air quality is analyzed.