塔式太阳能集热器HTF温度均化特性研究及评价

以太阳能发电站中集热器中的传热介质(HTF)为研究对象,并对其进行量化评价。采用数值模拟的方法研究3种介质在集热器内的流动和传热特性,流体介质假定为各向同性的均匀介质,液相处于局部热平衡状态,对集热管的轴向切平面和周向截面的温度分布进行分析和定量评价。结果表明,液态钠作为塔式太阳能集热管的传热介质时管壁及管内的温度分布更均匀,在流动和传热方面有比S-S或HITEC更适合作为传热介质的潜力。

RESEARCH AND EVALUATION OF TEMPERATURE HOMOGENIZATION CHARACTERISTICS OF HTF ON SOLAR TOWER COLLECTOR

In this paper,the heat transfer fluid(HTF)in the collector of solar power station is studied and evaluated quantitatively.The flow and heat transfer characteristics of the three kinds medium in the collector are studied by numerical simulation.The fluid medium is assumed to be isotropic homogeneous medium,and the liquid phase is in a state of local thermal equilibrium.The temperature distribution of the axial tangent plane and the circumferential section of the collector are analyzed and quantitative evaluation.The results show that when liquid sodium is used as the heat transfer medium on the solar tower collector,the temperature distribution in the tube wall and inside of the tube is more uniform,and it is more suitable than S-S or HITEC as the HTF.