Study On Heating Simulation Of Double Wind Combined Radiator In Tall Workshop

In China,the heating of tall industrial plants in winter takes up a large proportion.Combined with the engineering practice,it is found that the heating of tall plants is not ideal.It consumes a lot of energy but can not guarantee the thermal comfort of employees,or even can not meet the temperature requirements of mechanical equipment.Therefore,it is of great significance to propose and optimize the heating form of combined radiator with upper air supply and air curtain to form comfortable working temperature and reasonable and effective air distribution in tall building.The research content is to compare and simulate the heating form of double-layer air combined radiator in tall building,so as to improve energy efficiency,reduce operating cost and satisfy the comfort of personnel.Aiming at the high and tall workshop,the double layer air combined radiator heating system is designed for the hot air flow upward and the vertical temperature gradient is large.The upper high-speed jet forms a thermal insulation layer to block the hot air flow floating on the lower heating fan,and the lower heating fan binds the hot air around the radiator to flow in the personnel working area.The theoretical experience shows that the air supply jet track bends downward along the jet path and has an upward trend at the end of the jet.The larger the jet velocity,larger the range,the smaller the terminal velocity attenuation,and the stable interface can be formed.It is feasible to strengthen the flow of the working area and increase the temperature of the personnel activity area.Aiming at the key factors affecting the air curtain: the height difference between the upper air outlet and the lower heating fan,the influence of the upper air temperature and the upper air velocity,the simulation and qualitative analysis are carried out to ensure the heating effect of the double-layer air combined radiator in the tall workshop.Using CFD method,its advantages are not limited to the model size,reducing the influence of human factors and measurement error,without excessive investment of financial and human resources,a broader application field,aiming at the complex computational domain can resolve the physical quantity of each point inside the flow field.Using Fluent software to simulate the temperature field and airflow field of the two-layer wind combined radiator heating system in a tall building,it ensures the accuracy and saves more time than the experimental test.After establishing the physical model,the K-ε turbulence model and SIm PLE algorithm are applied to obtain the visual temperature cloud map and velocity vector map of each section inside the building.Finally,it is verified that the double-layer air combined radiator heating is indeed superior to the traditional radiator heating.When the height difference between the upper and the lower layers is 4 meters and the upper air supply temperature is 18℃ and the upper velocity is 4m/s,the comfort level of the personnel in the tall building is optimal.