Proposed solar Rankine cycle system with phase change steam accumulator and CPC solar collector
Proposed solar Rankine cycle system with phase change steam accumulator and CPC solar collector
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DOI：
10.1109/iecec.2002.1392137
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发表时间：
2002-07
期刊：
影响因子：
--
通讯作者：
T. Saitoh;A. Hoshi
中科院分区：
文献类型：
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作者：
T. Saitoh;A. Hoshi
提出了一种由CPC（复合抛物面聚光器）集热器和相变式蒸汽蓄能器组成的先进太阳能热电系统。据估计，以水蒸气为工作流体的系统的发电效率约为16%，比夏季运行的光伏（PV）电池的发电效率（约67%）高出约3倍。目前系统的总效率包括空间供暖/热水供应超过60%。结果表明，用R-113（C/sub 2/Cl/sub 3/F/sub 3/）等有机流体代替工作流体，发电效率可达21%以上。首先，介绍了如何提高CPC集热器的热效率。做了很多改进，包括双层玻璃填充氪气体，高温隔热和选择性涂层。开发的CPC具有世界上最好的热效率（例如，在TII=0.14时为50%），包括真空集热器。其次，设计了采用高温相变材料（PCM）的相变蒸汽蓄能器，并进行了实验和理论评价。该蒸汽蓄能器的性能是传统显热蓄能器的两倍。第三，基于“叠加（COS）概念”，发明并设计了新型汽轮机（膨胀机）。所提出的汽轮机由许多具有叶片元件的相同直径的薄圆盘组成。蒸汽以脉动流的形式从喷嘴引入涡轮。这种独特的汽轮机具有成本效益，可以很容易地扩展到“级联”。本文报道了该系统在实际太阳辐射和蓄热器条件下的实验结果。此外，它将表明，所提出的太阳能朗肯循环系统的发电性能比目前的光伏系统好三倍。
An advanced solar thermal electric system with CPC (compound parabolic concentrator) collector and steam accumulator of phase-change type was newly proposed. The electricity generation efficiency of the proposed system using water vapor as the working fluid is estimated to be about 16 percent, which is about three times better than that of photovoltaic (PV) cell (about 67 percent) under a summer time operation. The total efficiency of the present system including space heating/hot water supply exceeds 60 percent. It will be shown that the electricity generation efficiency exceeds 21 percent if the working fluid were replaced with organic fluid like R-113(C/sub 2/Cl/sub 3/F/sub 3/). First, the present authors describe how to improve the thermal efficiency of the CPC collector. A lot of improvements were done including double glazing filled with Krypton gas, high temperature insulations, and selective coating. The developed CPC has the best thermal efficiency (for ex. 50% at TII=0.14) in the world including evacuated collectors. Second, the phase-change steam accumulator with high temperature phase change material (PCM) is designed and evaluated both experimentally and theoretically. The present steam accumulator has twice as better performance as the conventional sensible heat accumulator. Third, the new steam turbine (expander) is invented and designed based on "the concept of superposition (COS)". The proposed steam turbine consists of numerous thin disks of the same diameter with blade elements. The steam is introduced from a nozzle to this turbine with pulsating flow. This unique steam turbine is cost effective and can be easily extended to incorporate "cascading". The present paper reports experimental results of the proposed system under actual solar radiation and under heat stored accumulator condition. Further, it will be shown that the proposed solar Rankine cycle system has triple times better electricity generating performance than the current PV systems.