Research On Brazing Temperature And Fin Heat Dissipation Characteristics Of Multi-element Parallel Flow Condenser

With the rapid development of China's economy and the continuous improvement of people's living standards,automobiles have become an indispensable means of transportation in daily life,and demand continues to increase.At the same time,people's requirements for cars are no longer simply to be able to ride.The comfort of a car has become another important criterion for judging the quality of a car.Automobile airconditioning system has become one of the signs to measure the car's functions,and it has been paid more and more attention by car manufacturers and users.The condenser is the core component of the automobile air-conditioning system,and its production quality directly affects the operation of the automobile air-conditioning system.Therefore,it is necessary to carry out research on the structure and heat dissipation characteristics of the multi-element parallel flow condenser in the automobile to improve the operating quality of the vehicle air conditioner.This paper takes the multi-element parallel flow condenser as the research object,the temperature field distribution in the brazing furnace was analyzed,and the simulation and optimization analysis of its fin angle were carried out.The main contents include the following aspects:(1)Based on the structural characteristics of the multi-element parallel flow condenser,the three-dimensional models of the whole condenser and its two important brazing parts,namely,the collector-flat tube and the flat tube-fin,were established by ANSYS.The corresponding temperature field simulation analysis was carried out.(2)Through the temperature field simulation analysis of the multi-element parallel flow condenser and the horizontal and vertical placement of the header-flat tube part in the brazing furnace,the thermal cycle curve and the thermal cycle under the horizontal and vertical placement were obtained.The temperature field distribution at the moment of baking.The maximum temperature and minimum temperature of the four stages of brazing and the time points were found.The temperature field distribution of the condenser as a whole and the header-flat tube part at the time of horizontal placement was consistent with the temperature field at the time of discharge.The maximum temperature difference was 0.47°C,the minimum temperature difference was 2.89°C,and the minimum temperature difference was closed to 10°C under vertical placement.Great influence on welding quality.(3)For the flat tube-fin part,the thermal cycle curve and the temperature field distribution at the time of furnace discharge were obtained when it was placed horizontally and vertically.The maximum temperature and minimum temperature and the time point of the four stages of brazing have been found.At the same time,the comparison showed that the condenser as a whole was in a good fit with the header-flat tube and flat tube-fin in the horizontal placement,whether it was the thermal cycle curve or the temperature field distribution at the time of the furnace,but the degree of fit was poor in the vertical placement.Therefore,it was finally determined that the best placement method for brazing the multi-element parallel flow condenser in the furnace was horizontal placement.(4)Under the premise of a certain length of fin installation space,the smaller the fin angle,the more fins per unit length,and the better the heat dissipation effect of the fins on the flat tube.However,due to the small angle of the fins,the installation gap of the fins will be too small,resulting in poor heat exchange between the fins and the air.Through the analysis of the temperature field of the multi-element parallel flow condenser under different fin angles,the results showed that as the fin angle increases,the temperature difference range increases and the heat dissipation effect decreases.Synthesizing the structure and actual operation of the multi-element parallel flow condenser,it was concluded that the suitable range of the fin installation angle was 0°?30°.The research in this article provides a reference for the study of the temperature field distribution during brazing of the multi-element parallel flow condenser and the influence of different fin installation angles on its heat dissipation performance.