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双层容积式太阳能吸热器性能分析

发表时间:2018-09-30  浏览量:137  下载量:53
全部作者: 黄月明,陈昊,胡明启,杨昆
作者单位: 华中科技大学能源与动力工程学院
摘 要: 容积式太阳能吸热器是塔式太阳能发电系统的关键部件。辐射传输采用Rosseland近似,推导得到了局部非热平衡条件下双层容积式太阳能吸热器内空气、多孔固相温度分布、吸热器热效率和压力分布的解析解,分析了沿流动方向孔隙率增加或减小和沿流动方向孔隙直径增加或减小对双层吸热器性能的影响。结果表明,第一层吸热器的厚度对吸热器入口处固相温度、吸热器热效率和压降有较大影响;沿流动方向孔隙率减小时的吸热器入口处固相温度与热效率均比孔隙率增加时的高;沿流动方向孔隙直径增加时的吸热器与孔隙直径减小时的吸热器相比,入口处固相温度更低,热效率更高;增加高孔隙率或高孔隙直径区域的厚度均能降低压降。
关 键 词: 一次能源;双层容积式太阳能吸热器;多孔介质;局部非热平衡;Rosseland近似;解析解
Title: Thermal performance analysis of a double-layer volumetric solar receiver
Author: HUANG Yueming, CHEN Hao, HU Mingqi, YANG Kun
Organization: School of Energy and Power Engineering, Huazhong University of Science and Technology
Abstract: Volumetric solar receiver is a key component of the tower solar power system. The Rosseland approximation is applied to account for the radiative heat transfer through the double-layer solar receiver. Analytical solutions for the air temperature, porous solid temperature, the thermal efficiency of solar receiver and pressure distribution are obtained along the receiver by using a local thermal nonequilibrium model. The effects of the gradual-porosity design and gradual pore diameter design along the flow direction on the performance of the double-layer receiver are analyzed. The results show that the thickness of the first porous layer has a significant effect on the solid inlet temperature, thermal efficiency of the solar receiver and pressure drop. Subsequently, compared with the increasing-porosity along the flow direction, the decreasing-porosity along the flow direction tends to achieve higher solid inlet temperature and higher thermal efficiency. What’s more, the increasing of pore diameter along the flow direction can achieve lower solid inlet temperature and higher thermal efficiency compared to the decreasing of pore diameter along the flow direction. Lastly, the pressure drop can be reduced by increasing the thickness of high porosity region or increasing the thickness of high pore diameter region.
Key words: primary energy; double-layer volumetric solar receiver; porous medium; local thermal nonequilibrium; Rosseland approximation; analytical solution
发表期数: 2018年9月第18期
引用格式: 黄月明,陈昊,胡明启,等. 双层容积式太阳能吸热器性能分析[J]. 中国科技论文在线精品论文,2018,11(18):1776-1787.
 
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