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Entransy analyses of thermal processes with variable thermophysical properties

机译：热物理性质可变的热过程的瞬态分析

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摘要

Entransy method is developed for the analyses of thermal processes with variable thermophysical properties. The entransy and enthalpy entransy balance equations for thermal processes with variable thermophysical properties are derived based on the definitions of differential entransy and enthalpy entransy. The definitions of the entransy and enthalpy entransy for an object are presented. The optimization principles for heat transfer and heat-work conversion processes with variable thermophysical properties are discussed with the concept of entransy. Entransy analyses for a two-stream heat exchanger and a closed Brayton cycle with variable thermophysical properties are conducted and compared with the entropy generation analyses. For the heat exchanger, the results show that both the minimum entransy-dissipation-based thermal resistance and the minimum revised entropy generation number correspond to the maximum heat exchanger effectiveness when the inlet condition of the heat exchanger is prescribed, but the minimum entropy generation rate and the minimum entropy generation number do not. For the closed Brayton cycle, the results show that both the maximum entransy loss rate and the minimum entropy generation rate correspond to the maximum output power and both the maximum entransy loss coefficient and the minimum entropy generation number correspond to the maximum heat-work conversion efficiency when the inlet conditions of the streams and the environmental temperature are prescribed. When the inlet temperature of the hot stream increases, larger entransy loss rate and larger entransy loss coefficient still correspond to larger output power and larger heat-work conversion efficiency respectively.
机译：开发了Entransy方法来分析具有可变热物理性质的热过程。基于微分焓和焓焓的定义，推导了热物理性质可变的热过程的焓和焓焓平衡方程。介绍了对象的entransy和焓entransy的定义。讨论了具有热物理性质的传热和热功转换过程的优化原理。进行了两流式换热器和具有可变热物理性质的封闭布雷顿循环的换能分析，并将其与熵产生分析进行了比较。对于换热器，结果表明，当规定了换热器的进气条件时，最小的基于耗散的热阻和最小的修正熵产生数均对应于最大的换热效率，但最小的熵产生率而最小熵产生数则没有。结果表明，在封闭的布雷顿循环中，最大熵损失率和最小熵产生率均对应于最大输出功率，最大熵损失系数和最小熵产生数均对应于最大热功转换效率当规定了流的入口条件和环境温度时。当热流入口温度升高时，较大的熵损失率和较大的熵损失系数仍分别对应于较大的输出功率和较大的热功转换效率。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2015年第11期|1244-1254|共11页
  • 作者

    Bing Zhou; XueTao Cheng; WenHua Wang; XinGang Liang;

  • 作者单位

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, 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

    Entransy; Variable thermophysical property; Heat transfer; Heat-work conversion; Optimization;

    机译：转换可变的热物理性质;传播热量;热功转换;优化;

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