The vertical inhomogeneous particle concentration in a large-space machining workshop with a displacement ventilation system will increase the required ventilation volume for indoor particle concentration reduction.The present work presents a particle concentration prediction model using a zonal modeling method that can rapidly predict the vertical particle concentration distribution for the energy-saving performance analysis of the ventilation system.The model,which takes the wall heat plume zone,heat source heat plume zone,and main airflow zone into account,can obtain the inter-regional airflow based on the energy balance and continuity equations and predict the zonal particle concentration based on the mass balance equations using particle emission rates and inter-regional airflow.A validation experiment conducted in a scaled chamber demonstrates that the relative error of the prediction model is less than 20%,it shows that the model can basically meet the engineering requirements.Further study of the prediction model by a case study under five particle emission conditions showed that the required air volume supply can be reduced by 18.83%to 44.41%compared to the traditional method used on variable air volume system.Overall,the prediction model can accurately and rapidly predict the vertical particle concentration distribution in large-space machining workshops under displacement ventilation,showing promising prospects in optimizing the performance of the ventilation system.
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