Decoration and fitment result in serious indoor air pollution in residential houses nowadays, furthermore, this kind of pollution can usually last for several years. The most effective way to eliminate indoor air pollution is to open the window to air the room at all seasons of the year. But compared to southern China weather conditions, there are frequently windy, dusty and great temperature differences days in Beijing especially around wintertime, causing indoor dust dispersion after ventilating though the window. People have to close the window in winter for years, making indoor air quality getting worse, which is quite harmful for the peoples physical and mental health.
Aiming at above problems, a new kind of unpowered fresh air exchange component based on natural ventilation is proposed in this paper. A typical north-south permeability residential house, which means that there are opposite windows in both north and south walls to make draught forming more easily, in Beijing was taken for example. The authors studied the influences to air exchange effects and room temperature in different working conditions when adopting this kind of unpowered fresh air exchange components to ventilate and exchange air for 24 hours without cease, analyzed applicable conditions, influencing factors, installation height, installation height difference, and air exchange effects etc. of the unpowered fresh air exchange components. The simulating calculation using Computer Fluid Dynamics (CFD) software and experimental test were conducted.
