Further Study on Permeability of Outdoor Particles in Temperature Difference into Indoor Air

Abstract To deeply understand the permeability of inhalable particles through window gap of buildings, an improved experimental setup was designed and experiments were conducted again based on the environmental chamber in Xi’an Jiaotong University. The experimental results indicated that in winter, with increasing of temperature difference between the indoor and outdoor air, more easily inhalable particles penetrated into indoor air, which was the same as those obtained in previous studies. When the temperature difference is less than 12℃, the greater the temperature difference, the higher the final equilibrium concentration of inhalable particles in indoor air. When the temperature difference is greater than 12℃, the final equilibrium concentration of indoor inhalable particles is basically the same, and it is not affected by the temperature difference. The temperature difference has a greater effect on the I/O ratio of PM2.5. High temperature difference increases not only the energy consumption of heating system but also the energy consumption of ventilation system.