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Energy and Entropy-Based Optimization of a Single-Stage Water-Lithium Bromide Absorption Refrigeration System

机译:单级水-溴化锂吸收式制冷系统的基于能量和熵的优化

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摘要

Thermodynamic optimization of single-stage water-LiBr absorption system was performed earlier both from first- and second-law points of view. However, a realistic comparison between the two approaches is essential to identify the superior one. Hence a theoretical model is developed to optimize the absorption chiller for identifying conditions corresponding to maximum system coefficient of performance (COP) and minimum entropy generation rate. Optimum generator temperature for minimum entropy generation is found to be lower than that corresponding to maximum COP, with absorber having a dominant role in enhancing irreversibility in system. Optimal generator temperature decreases with increasing evaporator temperature and decreasing condenser temperature. Thus, it is possible to identify optimum value for any combination of condenser and evaporator temperature from both the energy and entropy points of view. Concerned contour maps are presented. Adoption of an entropy-optimized map is suggested, owing to higher sensitivity of entropy generation to the changes in condition compared to COP.
机译:从第一定律和第二定律的观点来看,单级水-LiBr吸收系统的热力学优化是较早进行的。但是,两种方法之间的现实比较对于确定高级方法至关重要。因此,开发了一个理论模型来优化吸收式制冷机,以识别与最大系统性能系数(COP)和最小熵产生率相对应的条件。发现用于产生最小熵的最佳发生器温度低于对应于最大COP的发生器温度,而吸收剂在增强系统的不可逆性中起主要作用。发电机的最佳温度随着蒸发器温度的升高和冷凝器温度的降低而降低。因此,有可能从能量和熵的观点确定冷凝器和蒸发器温度的任何组合的最佳值。提出了相关的轮廓图。建议采用熵优化图,因为与COP相比,熵生成对条件变化的敏感性更高。

著录项

  • 来源
    《Heat Transfer Engineering》 |2016年第4期|232-241|共10页
  • 作者单位

    Department of Mechanical Engineering, Bengal Engineering & Science University Shibpur, Howrah, West Bengal, India;

    Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India;

  • 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
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