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首页> 外文期刊>Energy Conversion & Management >Potential of the transcritical Rankine cycle using CO_2-based binary zeotropic mixtures for engine's waste heat recovery
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Potential of the transcritical Rankine cycle using CO_2-based binary zeotropic mixtures for engine's waste heat recovery

机译：使用基于CO_2的二元共沸混合物的跨临界朗肯循环对发动机余热回收的潜力

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摘要

The CO2 transcritical Rankine cycle has considerable potential for the waste heat recovery of engine, but its high operation pressure, harsh condensation condition and low thermodynamic performance are huge obstacle restricting the wide application of it. The purpose of this paper is to investigate the performance improvements of transcritical Rankine cycle using CO2 mixtures for the waste heat recovery of engine. A large number of refrigerants are discussed and then eight of them are selected as the candidate additives into CO2. The Peng-Robinson equations of states are applied to calculate the properties of CO2 mixtures in this study. Afterwards, thermodynamic, economic and miniaturization analyses are implemented. The results show that CO2 mixtures can enlarge the condensation temperature range of the transcritical Rankine cycle and the high operation pressure will also be improved. Moreover, based on transcritical Rankine cycle with optimal power output, CO2/R32 (0.3/0.7) performed best when the condensation temperature is lower than 40 degrees C, else the CO2/R161 (0.45/0.55) is a suitable selection among the CO2 mixtures. The optimal operation pressure will reduce by 36% and 35% respectively for the transcritical Rankine cycles with CO(2/)R161 (0.45/0.55) and CO2/R32 (0.3/0.7) compared with the CO2 transcritical Rankine cycle. Based on transcritical Rankine cycle with optimal total heat transfer area, the CO2/R32 (0.7/0.3) is the best selection. The optimal operation pressure of transcritical Rankine cycle with CO2/R32 (0.7/0.3) decreases by 1.4 MPa and net output power increases by 8.8% compared with CO(2)transcritical Rankine cycle. The optimal total heat transfer area increment of CO2/R32 (0.7/0.3) will decrease by 29.4% compared with that of CO2/R32 (0.3/0.7).
机译：CO2跨临界朗肯循环具有回收发动机余热的巨大潜力，但其高工作压力，苛刻的冷凝条件和低的热力学性能成为制约其广泛应用的巨大障碍。本文的目的是研究跨临界朗肯循环使用CO2混合物改善发动机余热的性能。讨论了大量制冷剂，然后选择其中八种作为二氧化碳的候选添加剂。在本研究中，应用状态的Peng-Robinson方程来计算CO2混合物的特性。之后，进行热力学，经济和小型化分析。结果表明，CO2混合气体可以扩大跨临界兰金循环的冷凝温度范围，并且可以改善较高的工作压力。此外，基于具有最佳功率输出的跨临界兰金循环，当冷凝温度低于40摄氏度时，CO2 / R32（0.3 / 0.7）表现最佳，否则CO2 / R161（0.45 / 0.55）是CO2中的合适选择。混合物。与CO2跨临界朗肯循环相比，CO（2 /）R161（0.45 / 0.55）和CO2 / R32（0.3 / 0.7）的跨临界朗肯循环的最佳操作压力将分别降低36％和35％。基于具有最佳总传热面积的跨临界朗肯循环，CO2 / R32（0.7 / 0.3）是最佳选择。与CO（2）跨临界朗肯循环相比，CO2 / R32（0.7 / 0.3）的跨临界朗肯循环的最佳运行压力降低了1.4 MPa，净输出功率提高了8.8％。与CO2 / R32（0.3 / 0.7）相比，CO2 / R32的最佳总传热面积增量（0.7 / 0.3）将减少29.4％。

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  • 来源
    《Energy Conversion & Management》 |2018年第10期|668-685|共18页
  • 作者

    Shu Gequn; Yu Zhigang; Tian Hua; Liu Peng; Xu Zhiqiang;

  • 作者单位

    Tianjin Univ, State Key Lab Engines, 92 Weijin Rd, Tianjin 300072, Peoples R China;

    Tianjin Univ, State Key Lab Engines, 92 Weijin Rd, Tianjin 300072, Peoples R China;

    Tianjin Univ, State Key Lab Engines, 92 Weijin Rd, Tianjin 300072, Peoples R China;

    Tianjin Univ, State Key Lab Engines, 92 Weijin Rd, Tianjin 300072, Peoples R China;

    Tianjin Univ, State Key Lab Engines, 92 Weijin Rd, 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

    Transcritical Rankine cycle; CO2-based mixtures; Property calculation; Comparison analysis;

    机译：跨临界朗肯循环;CO2基混合物;性能计算;比较分析;

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