Structural Optimization And Experimental Study Of Finned-Tube Heat Exchanger

In recent years,every heating season in the northern cities has often led to frequent smog and excessive PM2.5.In order to curb the deterioration of this pollution situation,local governments at all levels have promoted“coal to electricity”heating in coal.In the reform of heating,the solid electric heat storage heating method is widely used because it can effectively utilize low-grid electricity resources and has a price advantage.In the solid electric heat storage heating mode,the wind-water heat exchanger is used to exchange the heat energy accumulated by the solids into the water heating system to realize the heat supply.In the design process of the solid electric heat storage heating system,how to improve the heat exchange efficiency of the heat exchanger has attracted more attention.In this paper,combined with the application of finned tube heat exchanger in solid electric heat storage system,the numerical simulation and orthogonal calculation of finned tube heat exchanger are carried out.Provide reference for the selection and structural optimization of finned tube heat exchangers.The main research contents include:?1?Analyze and study the solid electric heat storage structure and working principle,and complete the construction of the solid electric heat storage test system in combination with the actual needs of the specific project.?2?Based on the specific structure and related parameters of the built-up solid electric heat storage test system,the simulation model of the fin-and-tube heat exchanger was constructed.The tube array model was established by Gambit,and Fluent was introduced for numerical simulation to obtain the temperature,velocity and pressure distribution of the flow field in the heat exchanger.Based on the comparison between the simulation results and the actual operation data of the solid electric heat storage test system,the feasibility of the simulation of the rationality of the simulation model is verified.?3?Using the orthogonal method,the L₁₆?4⁵?orthogonal table is selected to compare the effects of the fin mix,height and thickness of the heat exchanger on the heat transfer coefficient,pressure drop and performance factor.,to obtain the optimal structure of the finned tube.For the optimized CP/6/22/0.6 fin structure,the velocity field,pressure field,and temperature field were analyzed by Fluent simulation,and compared with the CP/8/16/0.8 fin performance before optimization.The conclusion is that the heat transfer coefficient is increased by 7.79%and the output power is increased by 8.09%.The research results in this paper can provide reference for the structural design of finned tube heat exchanger in solid electric heat storage,and have certain practical significance for the optimization of solid electric heat storage heating system.