添加固体颗粒提高太阳能集热管内导热油光热转换性能  

Adding solid particles in heat conduction soil improves photo-thermal properties of solar collector tube

作　　者：高林朝[1,2] 沈胜强[2] 郝庆英[1] 刘存祥[3] 岳峰[1] 

机构地区：[1]河南省科学院能源研究所有限公司,郑州450008 [2]大连理工大学能源与动力学院,大连116024 [3]河南农业大学理学院,郑州450002

出　　处：《农业工程学报》2013年第22期206-211,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：河南自然科学基金(10230041008);河南省重点科技攻关项目(092102310129)

摘　　要：利用太阳辐照玻璃真空管加热导热油的试验装置,试验研究了添加不同种类和不同质量分数的固体颗粒对导热油光热转换特性的影响,通过测量闷晒温度和闷晒太阳辐照量间接比较了3种试验流体的热性能;理论分析了固体颗粒对导热油吸热与对流传热的强化机理。结果表明：添加铜箔颗粒可提高导热油平均温度14℃;同等试验工况石墨-油分别与铜箔-油和铝箔-油的最大温差达3.3和7℃;质量分数3%-3.2%的铜箔颗粒对提高导热油闷晒温度较有利,增大含量对光热转换的强化效果不明显。石墨-油和铜箔-油显示出良好的光热转换性能。该研究为导热油在太阳能热发电和热管热水器领域的应用提供科学参考。Adding solid suspended particles into liquid is one of the effective methods to enhance heat transfer properties, and is discussed widely. The fluids of added solid particles have excellent thermal transport properties and spectral absorption properties, and can be used as a working fluid for a direct absorption solar collector to improve the collection efficiency. However, in the research on photo-thermal properties effect of solid suspended particles on heat conduction oil（HTF）, the existing literature is reported less. Therefore, this paper aimed at determining clearly the influence of solid particles on solar radiation absorption properties of HTF. In this work, the photo-thermal performance tests of HTF were conducted in all-glass evacuated solar collector tubes under solar irradiation. Three experimental fluids（carbon powder-oil, copper foil-oil, and aluminum foil-oil） with different content were prepared. The spectral absorption properties and photo-thermal conversion properties were compared among the three experimental fluids through measuring the insolation temperature and solar radiation. Meanwhile, the temperature tests of water、HTF, and copper foil-oil were performed under solar irradiation. The effects of three solid particles（carbon, copper, and aluminum） and copper foil particles with different mass fraction（0.8%, 1.6%, 3.2%, and 6.4%） on the temperature rise of HTF were studied respectively. In order to evaluate the heat start-up performance of experimental fluids, the effects of solar radiation on temperature rise were also investigated by measuring the amount of solar irradiation. In addition, the mechanism of the spectral absorption enhancement and convective heat transfer enhancement of solid particles on HTF were analyzed. The research results showed that adding solid particles can improve the temperature of HTF under solar irradiation. The copper foil particles can improve the average insolation temperature by 14℃. The insolation temperature of carbon powder-oil was the

关 键 词：太阳辐射 热效应 温度 太阳能集热管 导热油 固体颗粒 光热特性 

分 类 号：TK519[动力工程及工程热物理—热能工程] TK124