Structure Optimization And Experimental Study Of Water Distributor In Thermal Storage Tank

With the increasingly severe energy consumption,the country has introduced corresponding new energy development policies,but some new energy systems operate unstable.The reasonable use of heat storage device can effectively solve this problem.A widely used heat storage device in the regional Hydronics is the heat storage tank.Optimize and analyze the structure of the water distributor in the thermal storage tank through theoretical derivation and experimental research,improve the thermal efficiency of the tank operation,and achieve stable utilization of renewable energy.This article first conducts research on the operation of actual engineering heat storage water tanks.Through real-time data analysis,it is found that the internal temperature stratification effect of the water tank is poor and the operating efficiency is low.After consulting relevant literature and analyzing the factors affecting the thermal performance and operating characteristics of the heat storage tank,it was found that there is a correlation between the temperature stratification inside the heat storage tank and the uniformity of the water distributor flow.Research has shown that the thermal efficiency of water tank operation can be improved by improving the structure of the water distributor.Secondly,using the actual engineering heat storage tank as the physical model,a theoretical analysis is conducted on its U-shaped water distributor structure.By studying the basic component unit of the water distributor in the thermal storage tank,the porous diffuser,the flow theory and structural size of the porous diffuser are analyzed to determine the impact on the flow from the side orifice of the pipeline.Based on comprehensive consideration,a mathematical model is established to analyze the momentum changes and frictional resistance that affect the pressure distribution of the pipeline.The pipeline opening ratio is determined under the four influencing factors of the length and diameter of the porous diffuser pipe,as well as the diameter and spacing of the holes on the side of the pipeline.Based on relevant theoretical knowledge,derive the correlation between the uniformity of outlet flow and the opening ratio of the porous diffuser in the water distributor of the thermal storage tank.Then,the existing experimental platform was renovated,and experimental research was conducted on the flow uniformity of the porous diffuser with 25 different opening ratios of 3 different pipe lengths and 5 different opening diameters.The experimental data was summarized under different opening ratios,and the relationship between the opening ratio of the porous diffuser in the water distributor of the heat storage tank and the flow uniformity of the orifice was obtained.Verifying the relationship under specific pipeline conditions,the analysis shows that the error between the measured value of flow uniformity and the predicted value of the relationship does not exceed 3%.Therefore,this relationship can be used as a formula for the uniformity of discharge.Finally,based on this relationship,an optimization plan for the water distributor of the heat storage water tank is designed and a water tank experimental platform is built.Verify the uniformity of the outlet flow of the U-shaped water distributor in the thermal storage tank,use thermocouple measuring points to monitor the temperature changes inside the tank in real time,and conduct experimental research on the internal operation of the tank under different inlet flow conditions.Collect data from the paperless recorder module and analyze the data based on the temperature measurement points on the cross-section of the heat storage tank.The results indicate that the thickness of the inclined temperature layer inside the water tank is between0.3 and 0.4m,which is within a reasonable range.After optimization,the water distributor of the heat storage water tank has a uniform outlet flow,and the internal temperature stratification of the water tank is relatively good.The overall operation is good.The research results verify the feasibility of the optimization scheme for the water distributor of the thermal storage tank.