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Theoretical analyses of pressure losses in organic Rankine cycles

机译：有机朗肯循环中压力损失的理论分析

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摘要

The thermodynamic efficiency of Organic Rankine Cycle (ORC) obtained from experimental systems has been obviously lower than theoretical results. One of the reasons is that some elements affecting the efficiency, such as pressure losses in evaporator, condenser and pipes, have not been deeply discussed and optimized. The present manuscript detailed and examined the influences of pressure losses on ORC thermodynamic efficiency. Pressure losses in ORC system were divided into three categories: High Pressure Loss of the first category (HPL1), High Pressure Loss of the second category (HPL2) and Low Pressure Loss (LPL). A formula was developed to describe the relationships between three categories of pressure losses and ORC thermodynamic efficiency. Through analyses of the formula, it is found that the adverse impacts of pressure losses on thermodynamic efficiency are very different, mainly depending on the characteristic specific volume of working fluid in certain state. Because the very different specific volume, under a same value of pressure loss, LPL mostly leads to the largest thermodynamic efficiency drop of ORC system, HPL1 does less and HPL2 does the least. The influences of LPL are normally 3-21 times larger than that of HPL1, and 30-50 times larger than that of HPL2. The conclusions will serve as a guide for engineering applications of ORC system.
机译：从实验系统获得的有机朗肯循环（ORC）的热力学效率明显低于理论结果。原因之一是影响效率的某些因素，例如蒸发器，冷凝器和管道中的压力损失，尚未得到深入讨论和优化。本手稿详细并研究了压力损失对ORC热力学效率的影响。 ORC系统中的压力损失分为三类：第一类高压损失（HPL1），第二类高压损失（HPL2）和低压损失（LPL）。开发了一个公式来描述三类压力损失与ORC热力学效率之间的关系。通过对公式的分析，发现压力损失对热力学效率的不利影响是非常不同的，主要取决于特定状态下工作流体的特征比容。因为在相同的压力损失值下，比容非常不同，所以LPL导致ORC系统的热力学效率下降最大，HPL1的作用较小，HPL2的作用最小。 LPL的影响通常比HPL1的影响大3-21倍，比HPL2的影响大30-50倍。结论将为ORC系统的工程应用提供指导。

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  • 来源
    《Energy Conversion & Management》 |2017年第12期|157-162|共6页
  • 作者

    Lei Biao; Wu Yu-Ting; Ma Chong-Fang; Wang Wei; Zhi Rui-Ping;

  • 作者单位

    Beijing Univ Technol, Key Lab Enhanced Heat Transfer & Energy Conservat, Beijing Key Lab Heat Transfer & Energy Convers, Minist Educ,Coll Environm & Energy Engn, Beijing 100124, Peoples R China;

    Beijing Univ Technol, Key Lab Enhanced Heat Transfer & Energy Conservat, Beijing Key Lab Heat Transfer & Energy Convers, Minist Educ,Coll Environm & Energy Engn, Beijing 100124, Peoples R China;

    Beijing Univ Technol, Key Lab Enhanced Heat Transfer & Energy Conservat, Beijing Key Lab Heat Transfer & Energy Convers, Minist Educ,Coll Environm & Energy Engn, Beijing 100124, Peoples R China;

    Beijing Univ Technol, Key Lab Enhanced Heat Transfer & Energy Conservat, Beijing Key Lab Heat Transfer & Energy Convers, Minist Educ,Coll Environm & Energy Engn, Beijing 100124, Peoples R China;

    Beijing Univ Technol, Key Lab Enhanced Heat Transfer & Energy Conservat, Beijing Key Lab Heat Transfer & Energy Convers, Minist Educ,Coll Environm & Energy Engn, Beijing 100124, Peoples R China;

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

    Organic Rankine cycle; Pressure loss; ORC thermodynamic efficiency;

    机译：有机朗肯循环;压力损失;ORC热力学效率;

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