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Novel experimental research on the compression process in organic Rankine cycle (ORC)

机译：有机朗肯循环（ORC）压缩过程的新实验研究

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摘要

Organic Rankine cycle (ORC) is one of the most promising methods for converting medium-low temperature thermal energy into power. Many studies have been performed to optimize the operating conditions, select proper working fluids, design efficient expansion machines, etc. However, as the major power-consuming component in ORC system, the circulating pump is rarely studied. Most of theoretical studies only assume a constant value of isentropic efficiency for the compression process, but this value varies with different studies. A small-scale ORC system is built in the present work to test the performance of a diaphragm pump, and the working fluids of R245fa, R123, R152a and R600a are tested under various conditions. The isentropic efficiencies of diaphragm pump for compressing those working fluids are between 57.22% and 93.51%. The results show that volume flow rate and pressure difference have great influence on isentropic efficiency, and the isentropic efficiency increases with the volume flow rate and pressure difference. Under the condition of same volume flow rate and pressure difference, the isentropic efficiency conforms to the order of eta(R245fa) > eta(R123) > eta(R600a) > eta(R152a). The analyses about the variation trend of isentropic efficiency are made from the perspectives of physical properties of working fluid and the driving mode of diaphragm pump, which prove that the hitting velocity of diaphragm to the liquid is the main cause for irreversible enthalpy increment. A novel parameter alpha(v)/rho c(p), is proposed to identify the influence of physical properties of working fluid on the performance of pump. The experimental results show that under same volume flow rate and pressure difference, the isentropic efficiency of pump decreases with the increment of alpha(v)/rho c(p), of different working fluids. (c) 2017 Elsevier Ltd. All rights reserved.
机译：有机朗肯循环（ORC）是将中低温热能转化为电能的最有前途的方法之一。为了优化操作条件，选择合适的工作流体，设计高效的膨胀机等，已经进行了许多研究。但是，作为ORC系统中的主要耗电组件，很少研究循环泵。大多数理论研究仅假设压缩过程的等熵效率值恒定，但是该值随不同研究而变化。在当前工作中建立了一个小型ORC系统来测试隔膜泵的性能，并在各种条件下测试R245fa，R123，R152a和R600a的工作流体。隔膜泵压缩这些工作流体的等熵效率在57.22％和93.51％之间。结果表明，体积流量和压力差对等熵效率有很大的影响，等熵效率随体积流量和压力差的增加而增加。在相同的体积流量和压差的条件下，等熵效率符合eta（R245fa）> eta（R123）> eta（R600a）> eta（R152a）的顺序。从工作流体的物理特性和隔膜泵的驱动方式出发，对等熵效率的变化趋势进行了分析，证明隔膜对液体的撞击速度是产生不可逆焓增加的主要原因。提出了一种新颖的参数alpha（v）/ rho c（p），以识别工作流体的物理特性对泵性能的影响。实验结果表明，在相同的体积流量和压力差下，不同工质的泵的等熵效率随α（v）/ rho c（p）的增加而降低。 （c）2017 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Energy Conversion & Management》 |2017年第4期|1-11|共11页
  • 作者

    Xu Weicong; Zhang Jianyuan; Zhao Li; Deng Shuai; Zhang Ying;

  • 作者单位

    Tianjin Univ, Minist Educ, Key Lab Efficient Utilizat Low & Medium Grade Ene, Tianjin 300072, Peoples R China;

    Tianjin Univ, Minist Educ, Key Lab Efficient Utilizat Low & Medium Grade Ene, Tianjin 300072, Peoples R China;

    Tianjin Univ, Minist Educ, Key Lab Efficient Utilizat Low & Medium Grade Ene, Tianjin 300072, Peoples R China;

    Tianjin Univ, Minist Educ, Key Lab Efficient Utilizat Low & Medium Grade Ene, Tianjin 300072, Peoples R China;

    Tianjin Univ, Minist Educ, Key Lab Efficient Utilizat Low & Medium Grade Ene, Tianjin 300072, 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; Compression process; Pump; lsentropic efficiency;

    机译：有机朗肯循环;压缩过程;泵浦;等熵效率;

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