Measurement and Analysis of Ventilation Rate and Indoor Air Quality of Two Typical Newly-built Residential Buildings in Xi'An in Winter——Natural and Mechanical Ventilation Scenarios
For two typical newly-built residential buildings with household fresh air systems in Xi'an,the ventilation rate and the indoor pollutant concentrations under three ventilation modes of natural infiltration,window-opening ventilation,and mechanical ventilation in winter were measured.The indoor air quality under different ventilation modes was evaluated and compared,and the problems of mechanical ventilation were diagnosed and analyzed by numerical simulation.The results show that the ventilation rate under natural infiltration is 0.17 h-1,the ventilation rate under different window-opening sizes is 1.43～3.74 h-1,and that under mechanical ventilation with different operating conditions is 2.31～4.50 h-1.The indoor CO2 concentration under the natural infiltration mode is seriously beyond the standard.When using window-opening ventilation to control CO2,it is necessary to ensure sufficient window opening time.The mechanical ventilation system with a filtering device can control the indoor PM2 5 concentration far below the limit value in haze weather.The six mechanical ventilation modes tested all can not control the indoor CO2 concentration within the limit,and the main reason is the improper air distribution design.The simulation and optimization results show that the best air distribution design is to set the side air supply inlet at the diagonal direction of the bottom exhaust door slot.
residential buildingsnatural ventilationmechanical ventilationventilation rateindoor air qualityair distribution
NETL
NSTL
万方数据
