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首页> 外文期刊>International Journal of Heat and Mass Transfer >Entransy balance for the closed system undergoing thermodynamic processes
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Entransy balance for the closed system undergoing thermodynamic processes

机译：进行热力学过程的密闭系统的运输平衡

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摘要

Entransy is a concept developed in recent years to measure the heat transfer ability of an object or a system at a temperature and has been used in heat transfer optimization. In this contribution, the closed system undergoing thermodynamic processes is analyzed from the viewpoint of entransy. Heat entransy flow and work entransy flow are defined with the consideration of heat interaction and work interaction respectively. The entransy balance equation is developed for the thermodynamic cycle and the processes of the Carnot cycle are discussed. In the cycle, the net heat entransy flow is showed to be equal to the net work entransy flow. The difference between heat entransy flow and work entransy flow is discussed. Work entransy flow can be input from low temperature to high temperature and vice versa. Heat entransy flow can only be transferred from high temperature to low temperature spontaneously, leading to entransy dissipation. The entransy balance equation for the closed system with irreversible processes and heat engines is further introduced by defining the irreversible entransy loss. The entransy balance equations are applied to analyzing the heat-work conversion in a system with given heat input. It is shown that reducing the irreversible entransy loss or the entropy generation can improve the heat-work conversion efficiency. For the reversible heating and air conditioning example in which heat from the high temperature heat source is first used to do work and then the work is used to pump more heat from environment into the target room, the change in work entransy flow can be used to measure the cost for the additional heat pumped from environment, but entropy generation is zero and could not be related to the benefit.
机译：Entransy是近年来发展起来的一种概念，用于在一定温度下测量物体或系统的传热能力，并已用于传热优化中。为此，从转移的角度分析了进行热力学过程的封闭系统。分别考虑热相互作用和功相互作用来定义热传递流和功传递流。建立了热力学循环的entransy平衡方程，并讨论了卡诺循环的过程。在循环中，净热传递流量显示为等于净热传递流量。讨论了热传递流与功传递流的区别。可以从低温到高温输入工作物流，反之亦然。热量传热流只能自发地从高温传递到低温，从而导致传热耗散。通过定义不可逆的运输损失，进一步引入了具有不可逆过程和热机的封闭系统的运输平衡方程。熵平衡方程用于分析具有给定热量输入的系统中的热功转换。结果表明，减少不可逆的熵损失或熵的产生可以提高热功转化效率​​。对于可逆供暖和空调的示例，在该示例中，首先使用来自高温热源的热量来做功，然后使用功来将更多的热量从环境中泵入目标房间，可以利用工作通过流量的变化来测量从环境中抽出的额外热量的成本，但熵产生为零，与收益无关。

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  • 作者

    XueTao Cheng; Qun Chen; Guojie Hu; 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; heat entransy flow; work entransy flow; thermodynamic cycle; irreversible entransy loss;

    机译：转换热传递流工作进入流程;热力学循环不可逆转的运输损失;

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