A kind of combined ventilation system that is suitable for residential buildings is presented in this article.The aim is to show the impact of the combined ventilation system on the indoor air quality(IAQ) of buildings.Experiments and simulations are carried out in a apartment based on the tracer gas decay method.In comparison with experimental results,it indicates that educational results generally agree with experimental results as well as this combined ventilation system can supply a high level of IAQ for it.Therefore,simulations can be used to study IAQ in buildings such as office when the combined ventilation system is applied.Finally,some important conclusions on this system are obtained through a lot of analysis.
