• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Energy Conversion & Management >Transient theoretical model for the assessment of three heat exchanger designs in a large-scale salt gradient solar pond: Energy and exergy analysis
【24h】

Transient theoretical model for the assessment of three heat exchanger designs in a large-scale salt gradient solar pond: Energy and exergy analysis

机译：评估大型盐梯度太阳能池中三种换热器设计的瞬态理论模型：能量和火用分析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper deals with transient modelling of a large-scale salt gradient solar pond (SGSP = 50000 m(2)) located in a semi-arid climate region. Precisely, the pond was exposed to meteorological data of the Agafay site (located 30 km south of Marrakesh-Morocco) covering the period from January 2015 to May 2017. We considered three different heat extraction technics (HET) including the reference one (R-HET) that limits the heat draw to the heat storage zone using horizontal tubes. The other two methods consider an additional heat draw from the intermediate non-convective zone using horizontal (HT-HET) and vertical (VT-HET) tubes. We elaborated a transient mathematical model based on energy balance equations for the pond (including the ground) and the extraction's tubes. This model was solved using a MATLAB code based on the fully implicit finite-difference scheme that has been developed for this purpose. The study focuses on the examination of the thermal performances of the considered SGSP for each of the three heat extraction methods based on energetic and exergetic analysis. The obtained results reveal that the third method of heat extraction (VT-HET) provides higher energy and exergy efficiencies by reducing the total heat losses towards the pond's surroundings and saving exergy from destruction. The amount of energy/exergy extraction improvement recorded is around 22.5%/30% compared to the reference heat extraction technic (R-HET) against an improvement of only 1.7%/0.6% for the HT-HET.
机译：本文研究了位于半干旱气候区的大型盐梯度太阳能池（SGSP = 50000 m（2））的瞬态建模。准确地说，该池塘暴露于2015年1月至2017年5月期间Agafay站点（位于马拉喀什-摩洛哥以南30公里）的气象数据。我们考虑了三种不同的排热技术（HET），包括参考技术（R-使用水平管将热量限制到储热区。另两种方法考虑了使用水平（HT-HET）和垂直（VT-HET）管从中间非对流区吸收的额外热量。我们基于池塘（包括地面）和提取管的能量平衡方程，精心设计了一个瞬态数学模型。使用基于为此目的开发的完全隐式有限差分方案的MATLAB代码解决了该模型。这项研究的重点是，基于能量和能量分析，对三种热提取方法中每一种均考虑了SGSP的热性能。获得的结果表明，第三种排热方法（VT-HET）通过减少流向池塘周围的总热量并节省了被破坏的火用量，从而提供了更高的能量和火用效率。与参考排热技术（R-HET）相比，记录的能量/余热提取改进量约为22.5％/ 30％，而HT-HET的改进仅为1.7％/ 0.6％。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号