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Experimental study of ceramic foams used as high temperature volumetric solar absorber

机译：陶瓷泡沫用作高温体吸收剂的实验研究

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摘要

Volumetric absorbers appear to be a promising technology in order to heat air above 1000 degrees C to feed combined-cycles (Brayton and Rankine thermodynamic cycles in cascade) for solar thermal electricity production. Thus, the choice of the absorber characteristics (material, geometrical parameters) is the key parameter to reach a maximum solar-to-thermal energy conversion efficiency. In this study, a test bench was developed and the solar-to-thermal efficiency of reticulate porous ceramics with open pores was characterized. Improvements with current state-of-the-art were made by the use of a homogenizer, ensuring spatially homogenized concentrated solar flux irradiation. Fluxmetry and calorimetry measurements were realized to evaluate the flux map incident on the tested absorber samples. A co-current position for the solar incoming power and the air flow rate was chosen for future comparisons with numerical predictions of atmospheric volumetric receivers. Several foam samples currently available in the industry were tested (Silicon Carbide, SiC) covering a wide range of porosity (72-92%) and pores per inch (5-20). A new selective material was also investigated (Zirconium Diboride, ZrB2). Experimental results for random foams were compared to the SiC honeycomb absorber considered to be the reference volumetric receiver. In the literature, two trends were proposed to produce the best performances: (1) the use of foams with large pore diameters and high porosity and (2) the use of small pore diameters with low porosity. This study showed the second trend resulted in the best absorber efficiency. In addition, the use of selective materials was found promising for atmospheric air receiver, provided the solar, absorptivity and the durability could be controlled. (C) 2016 Elsevier Ltd. All rights reserved.
机译：容积式吸收器似乎是一种有前途的技术，它可以将高于1000摄氏度的空气加热到联合循环（布雷顿和兰金热力学循环级联）中以供太阳能热发电。因此，吸收器特性（材料，几何参数）的选择是达到最大太阳能到热能转换效率的关键参数。在这项研究中，开发了一个试验台，并表征了具有开孔的网状多孔陶瓷的日光热效率。通过使用均质器对当前的最新技术进行了改进，以确保空间均质的集中太阳光辐射。实现了通量和量热测量，以评估入射到测试吸收体样品上的通量图。选择太阳能输入功率和空气流速的并流位置，以便与大气体积接收器的数值预测进行将来的比较。测试了目前在该行业中可用的几种泡沫样品（碳化硅，SiC），其覆盖范围广泛的孔隙率（72-92％）和每英寸的孔（5-20​​）。还研究了一种新的选择性材料（二硼化锆，ZrB2）。将随机泡沫的实验结果与被视为参考体积接收器的SiC蜂窝吸收器进行了比较。在文献中，提出了两种趋势以产生最佳性能：（1）使用具有大孔径和高孔隙率的泡沫，以及（2）使用具有低孔隙率的小孔径。该研究表明第二趋势导致最佳吸收器效率。另外，发现选择性材料的使用对于大气空气接收器是有希望的，只要可以控制太阳光，吸收率和耐久性即可。 （C）2016 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Solar Energy》 |2016年第10期|226-235|共10页
  • 作者

    Mey-Cloutier S.; Caliot C.; Kribus A.; Gray Y.; Flamant G.;

  • 作者单位

    PROMES CNRS Lab UPR 8521, 7 Rue Four Solaire, F-66120 Font Romeu Odeillo Via, France;

    PROMES CNRS Lab UPR 8521, 7 Rue Four Solaire, F-66120 Font Romeu Odeillo Via, France;

    Tel Aviv Univ, Sch Mech Engn, IL-69978 Tel Aviv, Israel;

    Tel Aviv Univ, Sch Mech Engn, IL-69978 Tel Aviv, Israel;

    PROMES CNRS Lab UPR 8521, 7 Rue Four Solaire, F-66120 Font Romeu Odeillo Via, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Solar volumetric absorber; High temperature; Solar furnace; Ceramic foam;

    机译：太阳能容积吸收器;高温;太阳能炉;陶瓷泡沫;

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