通过对有机朗肯循环工作过程的拆分解耦,利用工质物性中的临界温度、偏心因子结合循环参数推导其热力学性能表征式,进而建立循环的热力学模型,并借助该模型分析循环参数对循环热力学性能评价指标的影响规律。研究结果显示：当蒸发温度升高时,循环热效率会增大,但其净输出功和㶲效率先增大,然后再降低;当冷凝温度升高时,循环的热效率、净输出功和㶲效率都会下降;当过热度升高时,循环的净输出功和㶲效率随过之降低,而循环的热效率随之增大。基于工质物性引入雅各布数,循环的净输出功和热效率随雅各布数的增大分别呈现出增大和减小的趋势,而临界温度越高热效率随之升高。
Abstract
Through the separation and decoupling of the working process of the organic Rankine cycle, the thermodynamic performance expressions of the working fluid are derived by using the critical temperature, acentric factor in the physical properties of the working fluid and the cycle parameters, and then the thermodynamic model of the cycle is established. With the help of this model, the influence of the cycle parameters on the thermodynamic performance evaluation index of the cycle is analyzed. The research results show that as the evaporation temperature increases, the cycle thermal efficiency increases, but its net output power and exergy efficiency grows first and then decrease. When the condensation temperature increases, the thermal efficiency, net output work, and exergy efficiency of the cycle will all decrease. When the degree of superheat increases, the net output power and exergy efficiency decrease, while the cycle thermal efficiency increases. Based on the introduction of Jacobian number based on the physical properties of the working fluid, the net output power and exergy efficiency show an increasing and decreasing trend with the increase of Jacobian number, respectively. The higher the critical temperature, the higher the thermal efficiency.
关键词
有机朗肯循环 /
循环性能 /
解耦 /
工质物性
Key words
organic Rankine cycle /
cycle performance /
decoupling /
working fluid property
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基金
国家自然科学基金（52106010）; 中央高校基本科研业务费专项资金（2021MS077）; 河北省高等学校科学技术研究项目（QN2023081）; 保定市科技计划（2272P017）
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