Study On Performance Optimization Of Flat Finned-Tube Evaporator

Finned tube heat exchangers are one of the crucial pieces of heat exchange equipment in heating and cooling systems.Fins can expand the heat dissipation area and speed up the flow rate,enhance the heat transfer performance and improve the heat transfer efficiency.Studying improved heat transfer technology and enhancing the heat exchange equipment’s heat transfer performance is important to lower the energy consumption of heating and cooling systems,utilize energy efficiently,and save energy.The heat transfer efficiency of finned tube heat exchanger is mainly affected by the finned tube structure.To investigate the impact of altering the structural characteristics of the finned tube heat exchanger,the finned tubes with various structural parameters are simulated.The optimization value of the finned tube structure is obtained in this paper through the optimization matching of the flat finned tube heat exchanger structure,and the impact of the increased disturbance of the finned tube structure on the heat transfer performance of the finned tube heat exchanger is investigated.The calculation model is built by using the Space Claim software,which adopts the meteorological parameters of Shijiazhuang in Hebei Province.Moreover,the model is simplified based on the calculation cost and the calculation domain selects reasonable local fins.The calculation domain is meshed by using the Workbench Meshing.The grid scheme is adopted local grid refinement and grid independence examinations are performed to guarantee the calculation accuracy.Using the fluid calculation program Fluent calculates the heat exchanger factor j,friction factor f,and comprehensive evaluation factor j/f of the finned tube with various structural parameters under varied wind speeds(tube diameter D,fin space S_f,fin thicknessδ_f,and fin height H_f).The Coil Designer software is used to simulate the pressure drop of the refrigerant side,which obtains the optimal recommended parameters of the finned tube structure,taking into account the impact of the refrigerant side on the heat transfer of the finned tube.Besides,the effect of the disturbance on the finned-tube heat exchanger is explored by adding arch,triangle and square bumps on the optimal finned tube structure,which provides selection references for the design and the practical engineering applications.The results suggest that the recommended values of tube diameter,fin space,fin thickness and fin height of the finned tube are 7.00 mm,3.00 mm,0.20 mm and 8.00mm,respectively.In addition,the heat transfer performance of finned tube will be affected by increasing the disturbance,and the heat transfer performance of finned tube plus disturbance model C is the highest.According to the research,finned tube heat exchanger heat transfer efficiency can be effectively increased by optimizing the finned tube structure.This finding offers a fresh approach to increasing heat exchanger heat transfer efficiency and also establishes a benchmark for future finned tube heat exchanger design and selection.