Simulation Study On Air Distribution And Energy Consumption Of The Ventilation System For A Shelter Hospital In Severe Cold Area

In recent years,with the rapid spread of the novel coronavirus pneumonia epidemic worldwide,the number of confirmed cases of neo-coronavirus pneumonia has been rising,resulting in a serious shortage of medical resources,especially the number of beds for the treatment of confirmed cases.At the same time,outbreaks of new coronavirus pneumonia usually occur in winter,and cold regions are more prone to outbreaks in winter.New Coronary Pneumonia is a respiratory infection and requires a large amount of fresh air indoors to reduce the concentration of pollutants.In order to ensure the winter heating room temperature requirements of the square cabin hospital in severe cold areas,how to reduce the energy consumption of fresh air needs to be studied in depth.Although the current epidemic control in China has achieved initial success,in order to cope with similar emergency large-scale public health events that may occur in the future,this paper explores a reasonable solution for the design of ventilation systems in square-cabin hospitals in severe cold regions based on the previous simulation research program of airflow organization in tall spaces.The main research contents and conclusions are as follows.(1)Research and analysis of ventilation form of square cabin hospital and determination of air supply form:through domestic and foreign existing square cabin hospital ventilation system renovation program and its problems after putting into use related literature research,comparative analysis of advantages and disadvantages of various air supply forms,propose the bag air supply form and introduce its application.(2)Modeling of the bag air supply system of the square cabin hospital:Based on the common theoretical basis of jet calculation and turbulence numerical simulation of tall space,and combined with the situation of the proposed square cabin hospital,the air supply system model of the bed area of the square cabin hospital is established,and the grid division and grid-independence verification are carried out.(3)Simulation study on the effect of air supply parameters on the airflow organization of the square cabin hospital:Simulation study on the effect of air supply parameters on the airflow organization of the square cabin hospital,such as air supply form,air supply parameters,air supply and exhaust arrangement,and bed arrangement.By simulating and analyzing the airflow organization of air conditioning in winter with different air supply temperature,air supply speed and air supply height,we focus on the temperature and speed fields at the height of patient and doctor breathing area(0.6m and 1.7m).(4)bag air supply on the effect of pollutant removal simulation study: when the duct height is 4.5m,air supply temperature of 26℃,simulation analysis of the impact of different air supply volume each other cabin hospital indoor pollutant concentration.The volume fraction of pollutants was assumed to be 1,and the dilution factor was explored.(5)Analysis of heat sources in square cabin hospitals in severe cold regions:Based on the optimal air supply scheme derived in the previous paper,energy consumption calculations were performed for different air supply volumes of the fresh air system in combination with the meteorological conditions of Harbin in winter and the actual use of the Harbin Convention and Exhibition Center gymnasium.