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Thermodynamic efficiency of trilateral flash cycle, organic Rankine cycle and partially evaporated organic Rankine cycle
Energy Conversion and Management ( IF 9.9 ) Pub Date : 2021-10-13 , DOI: 10.1016/j.enconman.2021.114731
Sindu Daniarta 1, 2 , Piotr Kolasiński 1 , Attila R. Imre 2, 3
Affiliation  

Emerging and promising ways of utilizing any heat sources from geothermal, solar, combustion, and industrial waste heat may be the application of power plants that are operating according to conventional Rankine cycle (RC), organic Rankine cycle (ORC), trilateral flash cycle (TFC) employing different types of expansion (i.e., volumetric expanders or turbine). In this paper, the studies about partially evaporated ORC (PE-ORC) was carried out; furthermore, it reports on novel results related to the comparison of thermodynamic efficiency of TFC, ORC and PE-ORC. These results were obtained by modelling the system operations computed with MATLAB and the thermal properties library taken from CoolProp and REFPROP. The calculation was based on selected different types of working fluid classified by A, C, Z, M, N points (conventionally categorized by dry, wet, and isentropic working fluids) and the upper-lower operating temperature. The obtained results explain a new point of view on the efficiency of TFC, ORC and PE-ORC plants, that in some of the conditions (i.e., one can find certain combinations of working fluid quality, maximal and minimal cycle temperature), the efficiency of PE-ORCs outperforms TFC and ORC. It means that at certain temperature ranges and conditions when starting the expansion step from a partially evaporated state, it may be recommended to improve the performance of the cycle. It seems that obtained results offer new insight to scientists and engineers in designing the thermal power plant working under a subcritical cycle with high-temperature heat sources or a low-temperature heat sinks employing the selection of working fluids and different types of expanders.



中文翻译:

三边闪蒸循环、有机朗肯循环和部分蒸发有机朗肯循环的热力学效率

利用来自地热、太阳能、燃烧和工业废热的任何热源的新兴和有前途的方法可能是根据常规朗肯循环 (RC)、有机朗肯循环 (ORC)、三边闪蒸循环运行的发电厂的应用。 TFC) 采用不同类型的膨胀(即容积式膨胀机或涡轮机)。本文对部分蒸发的ORC(PE-ORC)进行了研究;此外,它还报告了与 TFC、ORC 和 PE-ORC 的热力学效率比较相关的新结果。这些结果是通过对使用 MATLAB 计算的系统操作以及取自 CoolProp 和 REFPROP 的热属性库进行建模而获得的。计算是基于选定的不同类型的工作流体按 A、C、Z、M、N 点分类(通常按干、湿和等熵工作流体)和上下工作温度。获得的结果解释了关于 TFC、ORC 和 PE-ORC 装置效率的一种新观点,即在某些条件下(即,可以找到工作流体质量、最大和最小循环温度的某些组合),效率的 PE-ORC 优于 TFC 和 ORC。这意味着在某些温度范围和条件下,当从部分蒸发状态开始膨胀步骤时,可能会建议提高循环的性能。似乎获得的结果为科学家和工程师设计在亚临界循环下工作的热电厂提供了新的见解,该热电厂采用高温热源或低温散热器,采用工作流体和不同类型的膨胀器的选择。和等熵工作流体)和上下工作温度。获得的结果解释了关于 TFC、ORC 和 PE-ORC 装置效率的一种新观点,即在某些条件下(即,可以找到工作流体质量、最大和最小循环温度的某些组合),效率的 PE-ORC 优于 TFC 和 ORC。这意味着在某些温度范围和条件下,当从部分蒸发状态开始膨胀步骤时,可能会建议提高循环的性能。似乎获得的结果为科学家和工程师设计在亚临界循环下工作的热电厂提供了新的见解,该热电厂采用高温热源或低温散热器,采用工作流体和不同类型的膨胀器的选择。和等熵工作流体)和上下工作温度。获得的结果解释了关于 TFC、ORC 和 PE-ORC 装置效率的一种新观点,即在某些条件下(即,可以找到工作流体质量、最大和最小循环温度的某些组合),效率的 PE-ORC 优于 TFC 和 ORC。这意味着在某些温度范围和条件下,当从部分蒸发状态开始膨胀步骤时,可能会建议提高循环性能。似乎获得的结果为科学家和工程师设计在亚临界循环下工作的热电厂提供了新的见解,该热电厂采用高温热源或低温散热器,采用工作流体和不同类型的膨胀器的选择。

更新日期:2021-10-13
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