A stationary evacuated collector with integrated concentrator
A stationary evacuated collector with integrated concentrator
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DOI：
10.1016/0038-092x(84)90196-8
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发表时间：
1984
期刊：
影响因子：
6.7
通讯作者：
K. Snail;J. O'Gallagher;R. Winston
中科院分区：
文献类型：
--
作者：
K. Snail;J. O'Gallagher;R. Winston
介绍了一种新研制的太阳能集热器的综合实验测试和详细的光学和热学模型。新的收集器具有65%的光学效率，在不跟踪太阳的情况下，在200°C的流体温度下实现了50%以上的热效率。通过以一种新颖的方式将真空绝缘、光谱选择涂层和非成像浓缩结合在一起，实现了高温操作和完全固定安装的同时特征。这三个设计元素通过将传统真空管的外部玻璃包络成形为非成像CRC型聚光器的轮廓，将这三个设计元素“集成”在一个独立的单元中。这允许使用第一面镜，并消除了对第二盖玻璃的需要。新的收集器被命名为“集成固定疏散浓缩器”，或ISEC收集器。ISEC的最高热效率不仅与商用跟踪抛物面槽相当，而且对年平均能量传输的预测也显示出具有竞争力的性能，在200°C以下的温度下可获得净收益。此外，ISEC较少受到曝光引起的降解的影响，可以通过与荧光灯类似的组装方法批量生产。由于不需要跟踪或倾斜调整，并且其敏感的光学表面受到环境保护，因此ISEC集热器提供了一个简单、易于维护的100-300°C太阳能集热器，适用于大多数气候和大气条件。潜在的应用包括空间供暖、空调和工业过程供热。
A comprehensive set of experimental tests and detailed optical and thermal models are presented for a newly developed solar thermal collector. The new collector has an optical efficiency of 65 per cent and achieves thermal efficiencies of better than 50 per cent at fluid temperatures of 200°C without tracking the sun. The simultaneous features of high temperature operation and a fully stationary mount are made possible by combining vacuum insulation, spectrally selective coatings, and nonimaging concentration in a novel way. These 3 design elements are “integrated” together in a self contained unit by shaping the outer glass envelope of a conventional evacuated tube into the profile of a nonimaging CRC-type concentrator. This permits the use of a first surface mirror and eliminates the need for a second cover glazing. The new collector has been given the name “Integrated Stationary Evacuated Concentrator”, or ISEC collector. Not only is the peak thermal efficiency of the ISEC comparable to that of commercial tracking parabolic troughs, but projections of the average yearly energy delivery also show competitive performance with a net gain for temperatures below 200°C. In addition, the ISEC is less subject to exposure induced degradation and could be mass produced with assembly methods similar to those used with fluorescent lamps. Since no tracking or tilt adjustments are ever required and because its sensitive optical surfaces are protected from the environment, the ISEC collector provides a simple, easily maintained solar thermal collector for the range 100–300°C which is suitable for most climates and atmospheric conditions. Potential applications include space heating, air conditioning, and industrial process heat.