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Solar collector with asymmetric compound parabolic concentrator for winter energy harvesting and summer overheating reduction: Concept and prototype device

机译：太阳能收集器与不对称的复合抛物线浓缩器冬季能量收获和夏季过热减少：概念和原型设备

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A major technical barrier of solar water heating systems for space heating and domestic water usage is the mismatch between the seasonal availability of solar energy and demand loads. The resulting low solar fraction in winter and high risk of overheating in summer reduces the competitiveness of this technology. Aiming to solve this problem, a novel collector module which combines asymmetric com-pound parabolic reflector with horizontally aligned evacuated tubular absorber is proposed in this paper. The special configuration enables the reflector to realize the seasonal dual function which performs as a concentrator in winter and a shading device in summer. This collector design can achieve high thermal performance during winter when demand is high and lower the efficiency in summer when demand is low. Based on the design principle, a prototype device was fabricated. Its photo-thermal behavior was investigated by the numerical approach as well as the experimental approach under real outdoor con-ditions on summer and winter days. Both theoretical and experimental results revealed that the pro-totype device has a high average optical efficiency on clear December days of 0.70, whereas it maintained low average optical efficiency of 0.39 on clear August days. In addition, the daily thermal efficiency remained above 0.5 for a large temperature difference between the fluid and ambient air at 77 K during the testing days around the winter solstice. These results confirmed that this solar unit achieves satis-factory performance in winter and also reduces the overheating risk in summer. (c) 2021 Elsevier Ltd. All rights reserved.
机译：太空加热和国内水的太阳能加热系统的主要技术屏障是太阳能和需求负荷的季节性可用性之间的不匹配。在冬季产生的低太阳能分度和夏季过热的高风险降低了这项技术的竞争力。旨在解决这个问题，本文提出了一种与水平对齐的抽空管状吸收相结合的非对称COM-磅抛物面反射器的新型收集器模块。特殊配置使反射器能够实现季节性双重功能，该季节性双重功能在冬季进行冬季和遮光装置。该收集器设计可在冬季实现高热性能，当需求高并且在需求较低时夏季效率降低。基于设计原理，制造了一种原型装置。通过数值方法研究了其光热行为以及夏季和冬季真实户外凝固下的实验方法。理论和实验结果都透露，Pro-CoType装置在0.70的明确透明的120日期具有高平均光学效率，而8月日期，它保持了0.39的低平均光学效率。另外，在冬至的测试天期间，每日热效率在77 k处的流体和环境空气之间的较大温差以上0.5。这些结果证实，该太阳能单位在冬季实现了满意性的性能，并在夏季降低了过热风险。 （c）2021 elestvier有限公司保留所有权利。

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