Research On Temperature Stratification Experiment And Simulation Optimization Of Baffle Heat Storage Tank

With the rapid development of cities and towns in northern China,building energy consumption is increasing,and the phenomenon of smog in the heating season is serious.Therefore,clean heating technology using renewable energy has attracted much attention.Low-carbon clean heat sources such as solar energy and w:ind energy have the characteristics of instability,volatility,and mismatch between supply and demand.In the application process,the thermal energy with these characteristics needs to be stored and converted into a continuous and stable thermal energy resource output,so as to effectively regulate the thermal energy Problems such as matching supply and demand,and improving the efficiency of heat utilization.The application of the hot water storage tank to the multi-energy complementary heating system can not only compensate for the instability and discontinuity of the heating system,effectively improve the heat utilization rate in the heating system,but also effectively store and allocate the system of heat.This article takes the clapboard type hot water storage tank of a variety of clean enetgy complementary heating systems in an enterprise park in Jilin City as the research object.First,an experimental study was conducted on its heat storage process.The thickness of the thermocline layer inside the water tank was used as an evaluation index.By calculating the thickness of the thermocline layer under different operating parameters,the temperature of the hot water storage tank during the thermal storage process was analyzed Layered effect to obtain the best operating parameters.The experimental results show that for the partition type hot water storage tank,when the hot water storage tank is operated under the operating parameters of low 'inlet flow rate and high inlet temperature,its temperature stratification effect is relatively good,and the preferred inlet flow rate is 0.2m/s,the inlet temperature is 65?.Secondly,after the experimental study,the physical model and mathematical model of the baffle type hot water storage tank were established,the temperature distribution inside the hot water storage tank was obtained,and the position and partition of the partition were analyzed using the number of layers and the mixing number The influence of the three factors of aperture and baffle angle on the temperature stratification of the hot water storage tank.The numerical simulation results show that the addition of a baffle in the baffle type hot water storage tank can effectively improve the temperature stratification effect.The baffle is arranged at a relative height of 0.8 for the heat storage tank.When the angle is 0°,the temperature stratification effect of the hot water storage tank is the best,which can effectively improve the heat storage efficiency of the system.Finally,based on the partition type hot water storage tank,the physical model and mathematical model of the hybrid hot water storage tank with phase change unit are established,and the melting process of the phase change material in the heat storage process is calculated to obtain the phase change material.The liquid phase rate is an evaluation index,and the effects of different phase change unit arrangements on the melting process of phase change materials are analyzed.The numerical simulation results show that for the hybrid hot water storage tank,add 14.73%of the total volume of phase change material inside the hot water storage tank,and assume that the temperature difference of 45? is set for the entire thermal storage process.The total amount of heat storage is 16.82%higher than the total amount of heat storage of the partition type sensible heat storage water tank It is faster and can effectively reduce the damage to the internal temperature stratification of the hot water storage tank.