An irreversible Stirling cycle with temperature difference both in non-isothermal and isochoric processes
An irreversible Stirling cycle with temperature difference both in non-isothermal and isochoric processes
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非等温和等容过程中具有温差的不可逆斯特林循环
DOI：
10.1016/j.energy.2019.115875
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发表时间：
2019-11-01
期刊：
影响因子：
9
通讯作者：
Liu, Wei
中科院分区：
文献类型：
--
作者：
Dai, Dongdong;Liu, Zhichun;Liu, Wei
本文应用有限时间热力学（FIT）方法，提出了一个工作在两个恒温外储库之间的不可逆热力循环，并以此来模拟实际斯特林发动机。为了分析回热过程，假设回热器由许多具有单独温度的较小的热源组成，并且在工作流体和这些较小的热源之间发生不可逆的热传递。为了分析膨胀和压缩过程，采用多方过程对膨胀和压缩过程进行建模，并首次从热力学角度得到了相应的多方指数。基于所提出的热力学模型，推导了热效率和输出功率的表达式。此外，热力学参数对功率和效率的影响进行了研究，以评估所提出的模型的性能。为了优化所提出的斯特林循环模型，采用基于拥挤距离的多目标粒子群优化算法（MOPSOCD）对输出功率和热效率进行了优化。(C)2019爱思唯尔有限公司版权所有。
In this paper, an irreversible thermodynamic cycle working between two constant temperature external reservoirs is proposed to model the practical Stirling engine by applying finite time thermodynamics (FIT). To analyze the regenerative processes, the regenerator is assumed to consist of numerous smaller heat reservoirs with individual temperature, and the irreversible heat transfer occurs between the working fluid and these smaller heat reservoirs. To analyze the expansive and compressive processes, polytropic processes are adopted to model the expansive and compressive processes, and corresponding polytropic exponents are obtained by thermodynamics for the first time. Based on the proposed thermodynamic model, the expression of thermal efficiency and output power are derived. In addition, the effects of thermodynamic parameters on power and efficiency are investigated to evaluate the performance of the proposed model. To optimize the proposed Stirling cycle model, an intelligent optimization algorithm named multi-objective particle swarm optimization based on crowding distance (MOPSOCD) is adopted to optimize the output power and thermal efficiency simultaneously. (C) 2019 Elsevier Ltd. All rights reserved.