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首页> 外文期刊>Renewable energy >Novel experimental approaches to investigate distribution of solar insolation around the tubes in evacuated tube solar collectors
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Novel experimental approaches to investigate distribution of solar insolation around the tubes in evacuated tube solar collectors

机译：研究真空管式太阳能集热器中管子周围日照量分布的新颖实验方法

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摘要

In this study, the exact amount of the rate of irradiance within the ambit of a tube in the evacuated tube solar collector (ETSC) has been measured in various hours of the day by means of a solar meter. Some novel correlations for determining the distribution of insolation intensity around the tube have been proposed by the analysis of experimental data. A correlation is offered by using the results of previous studies and mathematical analysis. The offered correlation is utilized to calculate the direction and the amount of the maximized insolation intensity in cross section area of the tube concerning geographical circumstances, hour angle, and the slope of the collector by denoting the solar radiation distribution function around the section of the tube. Moreover, by integrating around the tube, a correlation for calculation of the whole amount of the absorbed radiation through the absorber has been presented. In the end, the error analysis is conducted and the maximum amount of error for the proposed model is estimated to be 8% before 5 p.m., and at solar noon the amount of error is reported less than 1%. Furthermore, the energy efficiency of the constructed water heater is obtained as 65%. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在这项研究中，已在一天中的各个小时中通过太阳能表测量了真空管太阳能集热器（ETSC）中管范围内的辐照率的确切数量。通过对实验数据的分析，提出了一些新颖的相关关系，用于确定日照强度在管子周围的分布。通过使用以前的研究结果和数学分析可以得出相关性。通过表示管截面周围的太阳辐射分布函数，利用提供的相关性来计算与地理环境，小时角和集热器坡度有关的管横截面积中最大日照强度的方向和数量。此外，通过在管子周围进行积分，已经给出了用于计算通过吸收器吸收的辐射总量的相关性。最后，进行了误差分析，所建议模型的最大误差量估计在下午5点之前为8％，并且在太阳正午时，误差量据报道小于1％。此外，所构造的热水器的能量效率为65％。 （C）2018 Elsevier Ltd.保留所有权利。

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