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首页> 外文期刊>International Journal of Mechanical Engineering Education >Quantification of irreversibilities in practical cyclic processes using exergy analysis and Gouy-Stodola theorem
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Quantification of irreversibilities in practical cyclic processes using exergy analysis and Gouy-Stodola theorem

机译：使用（火用）分析和Gouy-Stodola定理量化实际循环过程中的不可逆性。

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摘要

The exergy analysis of a process to quantify the irreversibilities is advantageous over the entropy analysis in that it provides the definition of efficiency of a process, referred to as exergetic efficiency (defined as the ratio of exergy recovered to exergy supplied to the process). Unfortunately, the exergy analysis of practical multi-unit cyclic processes is rarely covered adequately in the undergraduate courses in engineering thermodynamics. In this article, the quantification of irreversibilities is illustrated in detail for a practical cyclic steam power plant using exergy analysis and Gouy-Stodola theorem. The efficiencies are determined for the various components and for the whole process. The theoretical background related to exergy, exergy analysis, and Gouy-Stodola theorem is also covered briefly for the benefit of the students. An assessment problem dealing with vapor-compression refrigeration cycle is included at the end in order to assess the intended learning outcomes of this article. The key solution steps along with answers are also provided for the benefit of the readers. As exergy analysis involves advanced level concepts in thermodynamics, the appropriate place for the introduction of the material presented in this article is the second, advanced level, course in thermodynamics.
机译：量化不可逆性的过程的能值分析优于熵分析，因为它提供了过程效率的定义，称为能效（定义为能值（回收的能值与提供给过程的能值之比））。不幸的是，工程热力学本科课程很少充分涵盖实用的多单元循环过程的火用分析。在本文中，详细说明了使用能值分析和Gouy-Stodola定理对实际循环蒸汽发电厂的不可逆性进行量化的方法。确定各种组件和整个过程的效率。为了学生的利益，本文还简要介绍了与火用，火用分析和Gouy-Stodola定理有关的理论背景。最后包括一个涉及蒸汽压缩制冷循环的评估问题，以便评估本文的预期学习成果。还提供了关键的解决方案步骤以及答案，以使读者受益。由于火用分析涉及热力学的高级概念，因此本文介绍的材料介绍的合适位置是热力学的第二级高级课程。

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