Indoor Air Distribution Design And Analysis Of An Ice Rink In Gansu Province

With the construction of various venues for the 2022 Beijing Winter Olympics and the policy guidance of "300 million people on ice and snow",China has ushered in a wave of construction and renovation of ice sports venues.But the ice rink energy consumption is huge,and because of its complex building structure,airflow between easy to mix and other factors,the use of conventional design methods and airflow organization program,often difficult to achieve the actual operating effect.If the airflow organization design is not reasonable,it will not only lead to energy waste,but also affect the comfort of indoor personnel,so the initial design often requires the use of numerical simulation software to assist in the design.Among them,CFD(Computer Fluid Dynamics)numerical simulation technology is widely used in the simulation of indoor airflow organization of tall space buildings because of its unique advantages.This paper adopts theoretical design and numerical simulation methods to simulate the winter conditions of the ice rink.First,by studying a large amount of data,combined with the unique climate characteristics of Gansu subalpine region,the indoor load,air supply parameters,airflow organization scheme and so on theoretical calculation and design.Then,the "National Speed Skating Stadium" was selected as the validation model,and the validity of the selected numerical model and method was verified by comparing and analyzing the simulated data with the measured data to ensure that the error of the results is within a reasonable range.Finally,following the principle of "single variable" for the winter working conditions of Gansu ice rink numerical calculation,through the analysis of the temperature distribution,velocity distribution and relative humidity of the standard surface under different working conditions to obtain the "preliminary best design plan",and then the air distribution of its working surface The optimal airflow organization design for indoor ice rink was finally obtained by considering the air distribution index(ADPI),whether the ice surface is fogged or not,and the thermal comfort of personnel(PMV-PPD index).From the above study,the following conclusions were obtained:1)Through numerical calculation and analysis of different air supply height,air speed,air temperature and air supply scheme in the spectator area,it is obtained that the airflow organization scheme of "air supply under the seats and air return above the seats" in the spectator area has unique advantages over the airflow organization scheme of "air supply above the seats and air return under the seats" in controlling the airflow parameters of the spectator area and the competition area independently and without mixing with each other.2)Numerical simulations of different internal structures(e.g.crash wall design),air supply temperature,air supply speed and air supply moisture content in the competition area showed that the optimized physical model(with openings in the crash wall)significantly improved the overall temperature field and relative humidity distribution in the working area,and further reduced the risk of fogging in the figure skating rink.3)Based on the research and analysis of 16 working conditions,and comprehensive Gansu ice rink interior design parameters(such as temperature and humidity,wind speed),ice fogging analysis,air distribution indicators and indoor personnel comfort and other factors to consider: working condition 16,indoor temperature is maintained at about 16℃,relative humidity is less than 50%,temperature and humidity distribution is uniform and fogging will not occur above the ice surface;air flow velocity less than The air flow velocity is less than 0.2m/s and the air distribution characteristic index ADPI is as high as 91.7%,which is a good airflow distribution and will not affect the normal performance of the athletes;when the personnel(athletes or auxiliary personnel)are at rest in the working area,the PMV range is between-0.3～-0.5 and the PPD value is less than 10%,which is a good thermal comfort for the personnel.Therefore,the final determination of working condition 16 is the best airflow organization design scheme for Gansu ice rink.