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Experimental investigation of energy and exergy performance of square and circular solar ponds

机译:方形和圆形太阳池能量和火用性能的实验研究

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摘要

Solar energy is a free, clean and widely available renewable energy. Various kinds of solar systems provide scope for several studies on energy and exergy analysis. Solar ponds are one of applications for collecting and storing solar energy simultaneously and are usable in regions with readily available land, much sunlight, and access to low-priced salt. In the present work, an experimental investigation of the energetic and exergetic performance of two prototype solar ponds with square and circular cross sections has been carried out. The solar ponds were built at Bafgh city, a city near Yazd in the central part of Iran. The cross sectional area and depth of both prototype solar ponds are 3 m~2 and 1.5 m, respectively. During 11 months of energy storage operation, a data acquisition system was used to measure the temperature variations along the height of the solar ponds and to capture the development of thermal stratification. Data collection is done with 10 min intervals. Thermal analysis of an experimental solar pond is usually a complicated task due to variations of many involved factors such as solar radiation, thermophysical properties of operating fluid, climatic changes etc. The energy performances of the solar ponds under investigation are carried out by modeling the solar incident radiation on the ponds surface, calculating energy exchange within each zone and thermal energy losses to the environment. Although the data are collected for almost one year of operation, however, the energy analysis is performed for some warmer months of the year during which the ponds are in the charging or energy storing period. An exergy balance model is also developed to investigate the exergetic performance of solar ponds. Monthly averaged exergy efficiencies are obtained for different regions of the ponds and compared with the corresponding energy efficiencies. The monthly average temperature of ambient is considered as the reference environment temperature for the exergy analysis. It was demonstrated that the circular solar pond has superior thermal performance than the square one. Stored water in the storage zone of the circular solar pond reaches to a higher temperature in comparison with the square one. It is attributed to the different shading effect in the two solar ponds. The maximum energy efficiencies for NCZ and HSZ of circular solar pond are found to be 17.25% and 25.8%, respectively while the corresponding values for the square solar pond are 17.39% and 23.65%. Maximum exergy efficiency for NCZ and HSZ are 0.86% and 2.44% for circular solar pond and 0.71% and 1.91% for the square solar pond.
机译:太阳能是一种免费,清洁和广泛使用的可再生能源。各种太阳能系统为能源和火用分析的若干研究提供了空间。太阳池是同时收集和存储太阳能的应用之一,可用于土地易得,阳光充足且可获取低价盐的地区。在目前的工作中,对具有方形和圆形横截面的两个原型太阳池的能量和能量性能进行了实验研究。太阳池是在伊朗中部亚兹德附近的巴夫市建的。两个原型太阳能池的截面积和深度分别为3 m〜2和1.5 m。在储能运行的11个月中,使用了一个数据采集系统来测量沿太阳池高度的温度变化并捕获热分层的发展。每隔10分钟收集一次数据。由于许多相关因素(例如太阳辐射,工作流体的热物理性质,气候变化等)的变化,对实验性太阳塘进行热分析通常是一项复杂的任务。所研究的太阳塘的能量性能是通过对太阳能进行建模来实现的池塘表面的入射辐射,计算每个区域内的能量交换以及对环境的热能损失。尽管收集了将近一年的数据,但是在一年中一些较暖的月份进行了能量分析,在此期间池塘处于充电或能量存储期间。还开发了一种火用平衡模型来研究太阳池的火用性能。获得池塘不同区域的月平均火用效率,并将其与相应的能源效率进行比较。每月的平均环境温度被视为火用分析的参考环境温度。事实证明,圆形太阳能池具有比方形池更好的热性能。与方形太阳能池相比,圆形太阳能池的存储区中存储的水达到更高的温度。这归因于两个太阳池中不同的阴影效果。圆形太阳能池的NCZ和HSZ的最大能量效率分别为17.25%和25.8%,而方形太阳能池的相应效率值为17.39%和23.65%。 NCZ和HSZ的最大火用效率对于圆形太阳池为0.86%和2.44%,对于正方形太阳池为0.71%和1.91%。

著录项

  • 来源
    《Solar Energy》 |2013年第11期|273-284|共12页
  • 作者单位

    School of Mechanical Engineering, Yazd University, Yazd, Iran;

    School of Mechanical Engineering, Yazd University, Yazd, Iran;

    Islamic Azad University, Bafgh Branch, Yazd, Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Solar energy; Solar pond; Energy analysis; Exergy analysis;

    机译:太阳能;太阳池;能量分析;火用分析;

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