에어컨 시스템 내 냉매 분배기의 2상 냉매 분배 특성에 대한 수치해석적 연구

다국어 초록 (Multilingual Abstract)

To improve the efficiency of heat transfer in cooling and heating systems, an efficient distribution of refrigerant is required. Especially, the performance of heat exchanger with the two-phase refrigerant is closely related with the splitting characteristics of refrigerant. In the present study, the splitting characteristic of two-phase refrigerant inside a distributor was numerically predicted by using an Eulerian method. For the prediction of pressure drop in several downstream tubes, the pressure boundary conditions based on the Lockhart and Martinelli method was applied to the outlet boundary of numerical model. With these numerical methodologies, splitting characteristic of two-phase refrigerant was predicted for various conditions. In this way, numerical results were in good agreement with experimental data. From the results, it was observed that the splitting characteristics of two-phase refrigerant are determined by the geometric factors of distributor. With the numerical results of splitting characteristics in the distributor with various geometric parameters, the optimized geometry of distributor was obtained for the uniform split of refrigerant.