The Refrigerant-side Structure Optimization And Performance Simulation Of Parallel Flow Condenser

In the view of the parallel flow aluminum heat exchanger with high efficiency, compact structure and so on, it has an irreplaceable status in the field of air-conditioner for the automobile, which is the most promising form of heat exchanger as the replacement for the heat exchangers of the home air-conditioning. In this paper, by the numerical simulation methods, the performance study of the parallel flow condenser in the refrigerant-side was analyzed, and in the domestic air-conditioning running condition, its structure was optimized as well.Based on the numerical simulation of the single-phase flow distribution in the parallel flow condenser's tube, the effects of the combined altitudes between inlet branch and manifold, the same with the flat tube and manifold, and the uniformity of the fluid distribution were analyzed. Studies have shown that, for the parallel flow condenser applicable to the domestic air-conditioning with the use of Horseshoe manifold, reducing the position of the inlet branch appropriately along with the distance decrease between the flat tube and manifold, the homogeneity of the single-phase flow distribution can be increased.For the simulation study on the flow characteristics and heat transfer properties in the mini-channel of the flat tube, the velocity field, temperature field and the condensed fluid distribution were analyzed, and liquid sheet formed from the condensed fluid flowed along the wall of the mini-channel was found. Finally, by the numerical analysis on the heat transfer performance with different inlet degree of dryness, it showed that the higher degree of dryness, the greater heat transfer performance. In addition, for the simulation analysis with different mass flow of refrigerant in the entrance, the results also showed that a specific structure for the existing mini-channel had an optimum mass flow of refrigerant.In this paper, the results provided a theoretical basis for the application and optimization of parallel flow condensers design in the field of home air conditioning.