Experimental Study On CFD Simulation Of Automobile Air Conditioning Condenser Parallel Flow Based

Automobile air-conditioning parallel flow condenser belongs to the compact heat exchanger, which is improved from duct tape condemn. It compromises the merits of small size, light quality and heat exchanger with high efficiency. The pros and cons of the heat transfer performance have a great influence on automotive air conditioning efficiency. The convective heat transfer is mainly processed on the air-side louver and flat tube on the refrigerant side. Therefore, the structural parameters of air-side louver and flat tube on the refrigerant side have an great impact on the performance of parallel-flow condenser. This essay is focused on the study of the influence that the structural parameters of louver and flat tube have on the change of condenser air side and a refrigerant-side heat transfer coefficient, pressure drop and flow characteristics, so that the optimization of the structure of louver and flat tube could be processed smoothly. The main research will be carried out in the following three steps:It starts with the performance study of parallel flow condenser air side and refrigerant side with the method of CFD. Study is about the variation of heat dissipating capacity,air flow field and pressure of condenser air side in different louver angle and distance under the circumstance of same wind speed and channel length. And it will be made by establishing the CFD model of parallel flow condenser air side louver and the numerical simulation of air flow field、 temperature field and pressure drop in flow channel of parallel flow condenser louver. Then, we will get the conclusion that the distribution of the air through louver runner is more uniform, and the performance of pressure drop and heat transfer is the best when the louver in the angle from27°-28°and the distance from1.6mm-1.8mm.The following study is about the influence of the flat tube’s stretching into the throttle pipe has on the flow uniformity of the chiller by the numbered analog simulation of refrigerant flow field and all flat tubes exports flow in parallel flow condenser single-phase flow flat tube. In the process, the combination of the actual process requirements is also important. It turns out that when the inlet flow of header pipe is0.044kg/s and flat tube extends into the depth which is H=0.5mm of the header pipe, the outflowing of refrigerant from the flat tube could produce minimum pressure drop and the maximum heat transfer. Thus, in order to increase the emission uniformity and amount of outlet flow, the header pipe in type D will take the place of the header pipe in type O. The numeral simulation finally indicates that outlet flow uniformity could be ensured by the sufficiently strong flat pipe structure.Finally, after getting the simulation results mentioned above, it is necessary to make the experimental study of different air side and refrigerant side groups parallel flow condenser to get the drop parameter of parallel flow condenser air-side heat transfer coefficient, pressure drop, air flow as well as the export flow of refrigerant flat tube, the evenness of the outlet flow, pressure drop in the different structural parameters. The results of the experiment are basically consistent with numerical simulation. It shows that the optimization results of the parallel flow condenser air side and refrigerant side structure parameters by numerical simulation are reliable. At the same time, it also proves that the physical design of applying CFD to parallel flow condenser air side blinds and refrigerant side flat tube is feasible. The method will contribute to the shortening of product development cycle and reduction of research costs.