Study Of Numerical Simulation On Natural Ventilation In Commercial Atrium And The Identification Of Its Grey Box Model

In commercial buildings, human body, lighting equipment, and solar radiationwill produce a large amount of heat, and the decorate material will produce volatiletoxic substances. And these heat and toxic substances usually concentrate on thepeople activities plane. Using atrium’s structure for natural ventilation will replace orpartly replace traditional air conditioning system. It can take away the waste heat anddirty air without using non-renewable energy. At the same time it can provide freshclean natural air, avoid sick building syndrome (SBS), and satisfiy people’s demandof being close to nature. Natural ventilation used in atrium is helpful for human bodyboth in mental and physical health.This research takes an underground commercial building’s atrium as an exampleto find the effect of natural ventilation, including velocity field temperature field PMVfield PPD field and air age, by using CFD computer numerical simulation. Afterstudying the buoyant-driven ventilation in the atrium, we puts forward and verifiedthe grey box prediction model for the ventilation volume based on the practicalapplication and theoretical basis. At last we promote and popularize this method ofthe grey box prediction model by using other paper’s experimental data. The maininnovation points and conclusions are as follows:(1) CFD numerical simulation shows that some area should use local exhaust oropen air conditioning system early. The paper also shows the quantitative analysis ofsome factors on the natural ventilation effect.(2) The prediction model is identified through priori knowledge and simulationresult. The validation of the model shows it is very simple, quick and accurate, within6%error.(3) Aftert using the model to predict the last set of case, it not only reflects theauthenticity and objectivity of the data, but also proves that the grey box predictionmodel is universality and applicability for both experiment and simulation.The simulation of natural ventilation effect, for this underground commercialbuilding’s atrium, provides the basis of construction scheme selection and localdesign. The identification of grey box model for this project provides a simple methodfor estimating the follow-up work, reducing the work, time and mental labour. Thisgrey box prediction model method is universality and applicability after validation, and it provides a simple scientific research ideas and calculation method for similarprojects in prophase aided designing.