Bus Air Conditioning System Evaporator Optimization Research

With the rapid development of today’s society, the domestic and foreign auto industry increasingly fierce competition, the automotive air conditioning system as a kind of to improve vehicle ride comfort and safety of the important components has become the automotive vehicle important feature. And evaporator as heat transfer in the automotive air conditioning system components have also been more and more attention and research. In this paper, based on domestic and foreign research status research of the evaporator, and then to concrete example evaporator model for automotive air conditioning system as the research object, carries on the optimization analysis, in order to solve these days bus air conditioning system in the thermal efficiency of the evaporator is not high, and take up the body such as large volume problem.Firstly, this article from the reaction of the market survey, specific bus air conditioning system performance experiments data and mathematical heat transfer model of evaporator three aspects analyzes the original bus air conditioning system performance and the heat transfer performance of evaporator. And from the following three aspects affecting the evaporator heat transfer effect has carried on the simple analysis: the geometry characteristics of the evaporator, the size of the evaporative air volume and the refrigerant R134 a filling quantity of everything. Then according to the result of analysis, mainly aimed at the structure of the evaporator model and three optimization scheme is put forward.Then, based on the original bus air conditioning system Evaporator model and three optimization of the evaporator model as the research object, on the CFD simulation research, the main program using FLUENT software for four evaporator air side flow field simulation model. Use original evaporator models as example, a detailed analysis of the evaporator mesh in the building up of the GAMBIT and FLUENT in calculation process. Simulation model for flow field of air velocity distribution, respectively, the simulation results of four kinds of model of evaporator are analyzed, the main analysis of four types of evaporator model air velocity distribution in flow field, including the size of the air flow rate, air flow field distribution is uniform and the heat exchange tube if there is a regional air flow velocity is very small, and so on and so forth, through the analysis of the optimization of eventually get the best solution.Finally, in this paper, has carried on the evaporator model experiment of monomers, monomer to experiment of laboratory equipment is introduced, and then presents the need to collect data in the process of experiment and need to analysis of experimental data. Is obtained by experimental result data were analyzed, and the final conclusion: program with FLUENT software simulation results, compared with the original bus air conditioning system refrigerating capacity without big changes, but the optimization system evaporator heat transfer effect is better, smaller volume, COP value of the system is also more at the same time, and the refrigeration evaporator faster.