摘要
针对海洋温差能可利用温差小,利用效率低的问题,本文提出了一种采用非共沸混合工质的新型海洋温差能回热循环,并基于热力学定律对提出的热力循环进行热力学分析。选取蒸发压力、工质的质量分数作为变量,对提出的热力循环进行热力学分析研究。研究结果表明:以工质质量分数为变量时,循环热效率和系统净输出随蒸发压力的增加先增大后减小,系统热效率在工质质量分数为0.91时取得最大值5.28%,净输出功在浓度为0.96时取得最大值3.83 kW。以蒸发压力为变量时,循环热效率和系统净输出随工质质量分数的增大先增大后减小,系统热效率在蒸发压力为0.595 MPa时取得最大值5.26%,净输出功在压力为0.58 MPa时取得最大值3.57 kW。在相同运行控制参数下与Uehara循环、Yoon循环进行对比,提出的循环系统热效率最佳。提出的热力循环系统分析结果可对提高海洋温差能利用效率提供理论依据和参考。
In view of the problems of small available temperature difference and low utilization efficiency of ocean thermal energy conversion(OTEC).A new thermodynamic cycle of OTEC using non-azeotropic mixed working flu-id is proposed.Based on the laws of thermodynamics,the thermodynamic analysis of the proposed thermodynamic cycle is carried out.Evaporation pressure,mass fraction of working fluid,evaporation temperature and condensa-tion temperature are selected as influencing variables to study the proposed thermodynamic cycle.The results show that when the working fluid mass fraction is selected as a variable,with the evaporation pressure increases the cycle thermal efficiency and the net output of system increase first and then decrease.The system thermal efficiency achieves a maximum value of 5.28%when the working fluid mass fraction is 0.91.The maximum value of 3.83 kW is obtained when the mass fraction of the working fluid is 0.96.When the evaporation pressure is selected as the variable,the cycle thermal efficiency and the net output of the system increase first and then decrease with the mass fraction of the working medium increases.The cycle thermal efficiency achieves a maximum value of 5.26%when the evaporating pressure is 0.595 MPa,and the net output work obtains a maximum value of 3.57 kW when the evaporating pressure is 0.58 MPa.Compared with Uehara cycle and Yoon cycle under the same operating condi-tions,the proposed cycle system has the highest thermal efficiency.The analysis results of the proposed thermal cycle system can provide a theoretical basis and reference for improving the utilization efficiency of OTEC.
作者
彭景平
葛云征
陈凤云
刘蕾
吴浩宇
刘伟民
Peng Jingping;Ge Yunzheng;Chen Fengyun;Liu Lei;Wu Haoyu;Liu Weimin(Marine Engineering Environment Research Center,First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2021年第5期120-126,共7页
基金
国家自然科学基金(41976204,51709055)
中韩海洋科学共同研究中心项目(PI-2018-3)。
关键词
海洋温差能
蒸发压力
循环热效率
工质质量分数
净输出功率
ocean thermal energy conversion
evaporation pressure
cycle thermal efficiency
working fluid mass frac-tion
net output work
