Study On Heat Transfer Of Spiral Tube Heat Storage Tank And Spherical Capsule Regenerator

At present,China is at a stage of rapid development as the countries of the world,and China's development has paid more and more attention to the problems of energy and environment,economy and climate.Therefore,accelerating the development of new energy and the research of renewable energy has reached the world consensus and concerted action.Solar energy utilization had received wide attention.Considering the uncertainty of solar energy,energy storage has become a hot topic in the research of various countries.This paper mainly studies the structure of the regenerator,which is mainly divided into the heat storage structure and the latent heat storage structure.The single spiral tube concrete heat storage tank structure is used for the sensible heat storage.Among them,water is used as a heat transfer medium,and high temperature concrete to study the influence of different factor such as temperature and speed of regenerative fluid on heat storage time.The change trend of temperature with time and the change of temperature field are obtained.In addition,the structure of the pitch spiral tube is studied and the influence factors of the equidistant spiral tube are compared analyzed.Latent heat storage adopts spherical capsule structure.The spherical capsule paraffin water is experimentally analyzed,and the melting point of phase change material is obtained.According to the experimental parameters,fluent is used to simulate,and the experimental structure is compared and analyzed to verify the quasi determination of the simulation.According to the simulation results,the structure of the spherical capsules was optimized,and fins were added to the enhance heat transfer,and the factors affecting the length and size of the capsules were analyzed.The results show that the temperature of the storage tank increases with the increase of the inlet velocity.As he inlet temperature increases,the heat transfer effect of the fluid and the regenerative material is also more obvious.With the increase of flow rate,the flow rate is not the main factor affecting heat storage,and temperature is the main factor affecting heat storage.However,the load time required for variable pitch,which improves the heat transfer efficiency.The loading time of the variable pitch spiral tube is shorter than that of the equal pitch spiral tube.Paraffin wax was used as a constant temperature water bath test platform for phase change materials.The phase transition interval of paraffin wax(RT27)was 299~305K,and the temperature change was very small,which released a lot of latent heat and lasted for a long time.The ts are simulation results are compared with the experimental results to verify the accuracy of the melting model of the fins added in the capsule.A latent heat storage model of spherical capsules was established,which increased fin heat transfer inside the spherical capsules and compared with finless capsule heat storage,adding fins to heat transfer enhancement of phase change materials in the capsule.With the increase of thelength of the fins,the temperature in the capsule increases and tends to be stable.When the size of the capsule is changed and the temperature of the monitoring the lager size of the capsule.