集中通风系统中污染物分布的快速算法

为快速、准确地评价集中通风系统中的室内空气品质 ,提出了污染物可及度的指标对全新风时污染物分布的不均匀程度进行描述 ,并针对实际的系统连接形式 ,建立了带回风时污染物浓度分布的计算模型。该模型综合了集总参数法和计算流体力学 (CFD)的特点 ,充分考虑了污染源位置、回风和局部排风等因素的影响。通过对各个房间的一次CFD模拟 ,获得了系统所有房间内的实际污染物分布。该算法可克服传统集总参数法结果不准确和 CFD需要多次迭代等方面的不足

Algorithm for quickly calculating the pollutant distribution in central ventilation systems

A calculation model was developed to calculate the value of a new index for quickly and accurately evaluating the indoor air quality in central ventilation systems. The contaminant accessibility index first describes the non-uniformity of the indoor contaminant distribution when the system supplies all fresh air. Then the model was used to calculate the final pollutant distribution in a real system with air re-circulation and local exhaust including the impact of source location, air re-circulation and local exhaust on the indoor pollutants. The conventional lumped parameter method was used to determine the boundary conditions for the computational fluid dynamics (CFD) model. The model can predict indoor concentration after only one CFD calculation for each room in the system. The results show that the model gives more accurate results than the lumped parameter method and greatly reduces the number of iterations required of the CFD simulation.