Study Of Pressure Gradients In Corridors-Buffer Rooms-Negative Pressure Wards And Air Environment Control Of Wards

The highly infectious and concealed nature of respiratory infectious diseases has led to a high number of infections among medical staff in hospitals receiving treatment for infected patients.As an important place for the admission of patients with respiratory infectious diseases,negative pressure wards play an important role in cutting off the transmission path of viral particles and reducing the risk of cross-infection in hospitals with infectious diseases.The key to scientifically constructing a negative pressure ward and effectively controlling its air environment lies in the rational design of pressure gradients and air organization to block airflow from the ward to surrounding clean areas,thereby reducing the risk of healthcare workers being infected.In this paper,we use CFD numerical simulations to investigate the pressure gradient between these areas and the effect of air control in the ward,using the corridor-buffer room-negative pressure ward as the target.The research work revolves around the following aspects.1.The standardization of negative pressure wards and related research at home and abroad are systematically described,and the limitations of using negative pressure wards alone as a research object are analyzed.Based on the above discussion,the research idea of integrating a corridor-buffer room-negative pressure ward is proposed.2.The control equations and turbulence models involved in this paper are introduced,as well as the numerical methods used to solve them;the numerical methods chosen to simulate the air flow in the ward are validated;the overall physical model of the corridor-buffer room-negative pressure ward is constructed,and the grid-independent validation is carried out.3.In order to effectively control the diffusion distribution of pollutant gases in the ward,the air organization in the ward is optimized,and numerical simulation methods are used to study the pressure gradient of the corridor-buffer room-negative pressure ward and the distribution pattern of the ward air environment for six air organization schemes.4.Direct introduction of outdoor air during the transitional season to study the changes of air temperature in the ward under different outdoor air temperatures and to explore the effectiveness of direct air introduction on the control of indoor temperature in the ward.5.Study the effect of simulated conventional air organization scheme and optimized air organization scheme on the diffusion of pollutant gases after the buffer room door is opened.In view of the phenomenon of contaminated gas spreading to the buffer room and the corridor in the conventional scheme,control measures are proposed to systematically study the inhibiting effect of different technical measures on the spreading of contaminated gas to the surrounding rooms;the distribution of contaminated gas concentration in the optimized scheme after the opening of the room door is analyzed,and it is obtained that the scheme can effectively inhibit the spreading of contaminated gas to the outside.