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Impact of utilizing reflector, single-axis and two-axis sun trackers on the performance of an evacuated tube solar collector
International Journal of Green Energy ( IF 3.1 ) Pub Date : 2020-08-10 , DOI: 10.1080/15435075.2020.1798766
Hassan Fathabadi 1
Affiliation  

In this paper, a novel evacuated tube solar collector (ETSC) is first designed and built. Then, the impact of adding reflector, reflector plus single-axis sun tracker and reflector plus two-axis sun tracker to the built ETSC on the thermal efficiency of the ETSC is evaluated both theoretically and experimentally. In this regard, four identical versions of the proposed ETSC have been built and utilized in four collectors built and presented in this research work. The first collector is the same proposed built ETSC, the second collector is a parabolic trough solar collector comprising one built ETSC and a reflector (ETSC+R), the third collector is composed of one built ETSC, a reflector and a single-axis sun tracker all built in this study (ETSC+R+ ST), and the fourth collector consists of one built ETSC, a reflector and a two-axis sun tracker all built in this study (ETSC+R+ DT). Theoretical basis and concepts of the four collectors are formulated and analyzed in separate subsections. Theoretical results are outlined and highlighted at the end of each subsection. Experimental measurements and data obtained from the operation of the four collectors in the four seasons are presented that point by point verify theoretical results obtained in this study. To provide a comprehensive view, a techno-economic numerical comparison is performed between the four collectors. The following points, which are also the novelty and contributions of this work, are deduced from theoretical concepts, experimental data, and comparison provided in this study:

•There is no technical and economic justification for adding a reflector to an ETSC that results in forming a parabolic trough solar collector (ETSC+R) without any sun tracker.

•There is no economic justification for adding a single-axis sun tracker to a parabolic trough solar collector (ETSC+R).

•There is no economic justification for adding a two-axis sun tracker to a parabolic trough solar collector (ETSC+R).

•Comparing between a two-axis sun tracker and a single-axis sun tracker, adding the single-axis type to a parabolic trough solar collector (ETSC+R) is more advantageous.



中文翻译:

使用反射器,单轴和两轴太阳跟踪器对真空管太阳能集热器性能的影响

本文首先设计并制造了一种新型的真空管太阳能集热器(ETSC)。然后,从理论上和实验上评估了将反射器,反射器加单轴太阳跟踪器和反射器加两轴太阳跟踪器添加到内置的ETSC中对ETSC的热效率的影响。在这方面,本研究工作建立并介绍了四个收集器,并构造了四个相同版本的拟议ETSC。第一个收集器是建议的内置ETSC,第二个收集器是抛物槽太阳能收集器,包括一个内置ETSC和反射器(ETSC + R),第三个收集器由一个内置ETSC,反射器和单轴太阳组成。跟踪器全部是本研究构建的(ETSC + R + ST),第四个收集器由一个内置的ETSC组成,本研究中均内置了一个反射镜和一个两轴太阳跟踪器(ETSC + R + DT)。这四个收集器的理论基础和概念在单独的小节中进行了阐述和分析。在每个小节的末尾概述并突出了理论结果。从四个季节的四个收集器的操作中获得的实验测量和数据被提出,一点一点地验证了在这项研究中获得的理论结果。为了提供全面的视图,在四个收集器之间进行了技术经济的数值比较。从本研究提供的理论概念,实验数据和比较中得出以下几点,也是本研究的新颖性和贡献:这四个收集器的理论基础和概念在单独的小节中进行了阐述和分析。在每个小节的末尾概述并突出了理论结果。从四个季节的四个收集器的操作中获得的实验测量和数据被提出,一点一点地验证了在这项研究中获得的理论结果。为了提供全面的视图,在四个收集器之间进行了技术经济的数值比较。从本研究提供的理论概念,实验数据和比较中得出以下几点,也是本研究的新颖性和贡献:这四个收集器的理论基础和概念在单独的小节中进行了阐述和分析。在每个小节的末尾概述并突出了理论结果。从四个季节的四个收集器的操作中获得的实验测量和数据被提出,一点一点地验证了在这项研究中获得的理论结果。为了提供全面的视图,在四个收集器之间进行了技术经济的数值比较。从本研究提供的理论概念,实验数据和比较中得出以下几点,也是本研究的新颖性和贡献:从四个季节的四个收集器的操作中获得的实验测量结果和数据被逐点验证了本研究中获得的理论结果。为了提供全面的视图,在四个收集器之间进行了技术经济的数值比较。从本研究提供的理论概念,实验数据和比较中得出以下几点,也是本研究的新颖性和贡献:从四个季节的四个收集器的操作中获得的实验测量和数据被提出,一点一点地验证了在这项研究中获得的理论结果。为了提供全面的视图,在四个收集器之间进行了技术经济的数值比较。从本研究提供的理论概念,实验数据和比较中得出以下几点,也是本研究的新颖性和贡献:

•在ETSC上增加反射器会导致形成没有任何太阳跟踪器的抛物槽式太阳能集热器(ETSC + R),因此在技术和经济上均无道理。

•在抛物槽式太阳能集热器(ETSC + R)上增加单轴太阳跟踪器没有经济上的理由。

•在抛物槽式太阳能集热器(ETSC + R)上增加两轴太阳跟踪器没有经济上的理由。

•比较两轴太阳跟踪器和单轴太阳跟踪器,将单轴类型添加到抛物槽式太阳能收集器(ETSC + R)更为有利。

更新日期:2020-08-26
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