太阳能线聚焦腔体结构吸收器热迁移因子理论分析  

THEORETICAL ANALYSIS OF HEAT REMOVAL FACTOR OF LINEAR CONCENTRATING SOLAR COLLECTOR USING CAVITY RECEIVER

作　　者：白涛[1] 代彦军[1] 王如竹[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《太阳能学报》2011年第6期836-842,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(No.50876063)

摘　　要：对4种用于线聚焦太阳集热器的腔体吸收器的热迁移因子和效率因子进行理论分析,获得热迁移因子的理论表达公式。搭建了以菲涅尔透镜为聚光器和以抛物槽式反射镜为聚光器的聚焦太阳能集热系统实验台,通过实验验证了热迁移因子理论公式的合理性。结果表明,三角形腔体吸收器具有最好的集热性能。在理论指导下对三角形腔体进行了优化:直接利用管道作为吸收器管道从而提高了热传导;选择合适的管道内径;聚焦比保证在40以上;加大流速强化对流换热。当采用菲涅尔透镜为聚光器时,其热迁移因子为0.834;采用抛物槽式反射镜为聚光器时,优化后的三角形腔体吸收器的热迁移因子可达到0.940。The heat removal factor and the efficiency factor of four kinds of cavity receivers were analyzed by the theory, which could be used in linear concentrating collectors, and then the theoretical formula of the heat removal factor FR was obtained. The testing system of parabolic trough collector and fresnel lens using cavity receiver were set up and many tests had been done, the experiment result is in accordance with the theoretical prediction. The resuits show that the triangle cavity receiver has the best performance, and was improved according to the theoretical model： the pipe was used as cavity wall directly to improve heat conduction; the best inner diameter was chosen; the concentrating ratio was not less than 40; the convection heat transfer was strengthened by increasing the mass flow. The heat removal factor was 0. 834 when the fresnel lens was used as the concentrator; while it could reach 0. 940 when parabolic trough collctor was used as the concentrator with the improved triangle cavity receiver.

关 键 词：效率因子 热迁移因子 腔体吸收器 线聚焦 

分 类 号：TK512[动力工程及工程热物理—热能工程]