| In the utilization of solar energy, the heat collector is the key component of all kinds of solar energy heat utilization system. But the low efficiency of solar air collector becomes an important reason for the popularization and application of the collector. So as to further improve the collector’s performance, researchers have put forward many novel collector optimization ideas, solar air collector with internal baffles is the typical representative. The internal baffles can effectively improve the heat efficiency. But the strong flow separation is caused by the baffles, resulting in the large flow loss and partial heat loss, which has become an important factor limiting to improve the efficiency of this type of collector. In this paper, solar air collector with holes on the baffles is studied. The hole factors and the inlet flow factor that could affect the thermal efficiency is studied in detail. It’s no doubt that great theoretical and practical significance will be produced.In this paper, a numerical model of the solar air collector with holes on the baffles is established, and the mesh generation, mesh independence checking and numerical model validation are also established. Using orthogonal numerical simulation method to optimize the parameters of open hole baffle solar air heat collector, by means of direct analysis and variance analysis,the influence of the 3 opening hole parameters, the size, the position, the number and the 1 operating parameters inlet flow on the thermal efficiency of the collector was studied. Through the analysis of the influence of these 4 factors on the efficiency, the optimal parameter combination scheme is obtained. The influence of the these 4 factors on the flow and heat transfer characteristics of the collector is also analyzed. Finally, based on the purpose of improving the internal air flow of the collector, the influence of inlet position and baffle length on the performance of the original collector is discussed. |
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