Effect of evaporator heat transfer process on selection of mixture and operating condition in ORC system

被引：0
|
作者：
Chen Y. [1 ,2 ]
Xu Y. [1 ,2 ,3 ]
Wang L. [1 ,2 ]
Ye S. [1 ]
Huang W. [1 ]
机构：
[1] Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai
[2] University of Chinese Academy of Sciences, Beijing
[3] ShanghaiTech University, Shanghai
来源：
Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 05期
关键词：
Entransy flow dissipation rate; Evaporator; Heat transfer; Irreversible loss; Mixtures; Numerical simulation; Organic Rankine cycle;
D O I：
10.11949/j.issn.0438-1157.20181238
中图分类号：
学科分类号：
摘要：
Under the condition of the same efficiency of other parts of organic Rankine cycle (ORC) system, the greater the heat exchange capacity of the evaporator, the smaller the irreversible loss, and the greater the potential of the system. Because of the phase transition temperature glide of mixture has good "matching" with the temperature change of heat source, this paper uses mixture as working fluid, and uses entransy flow dissipation rate to represent the irreversible loss of heat transfer process between mixture and heat source fluid. Combining T-Q diagram, the heat transfer process of mixture and heat source fluid in evaporator is analyzed. It is found that the area enclosed by the heat transfer curves of mixture and heat source fluid is the entransy flow dissipation rate, and the conditions of maximum heat transfer quantity and minimum irreversible loss of evaporator are obtained respectively, to guide the selecting of the optimal mixture and operation condition. According to the determined heat source, under the condition of maximum heat transfer quantity, a method for selecting the optimal mixture and optimal operating condition of the system based on the performance of evaporator is established. Adopting the heat source listed in reference paper, the optimum mixture and optimum outlet temperature are R600a/R134a(0.2/0.8) and 365.75 K, respectively. The heat transfer quantity of the evaporator is 3.3 times, under the condition that the parameters of other parts of the system are the same, the net output power of the system is 2.4 times than the optimum mixture in the literature. © All Right Reserved.
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页码：1723 / 1733
页数：10
相关论文
共 34 条
  • [11] Modi A., Haglind F., A review of recent research on the use of zeotropic mixtures in power generation systems, Energy Conversion & Management, 138, pp. 603-626, (2017)
  • [12] Collings P., Yu Z., Wang E., A dynamic organic Rankine cycle using a zeotropic mixture as the working fluid with composition tuning to match changing ambient conditions, Applied Energy, 171, pp. 581-591, (2016)
  • [13] Ni Y., Zhao L.J., Liu C., Et al., Recovery of waste heat of low-temperature flue gas by parametric optimization on organic Rankine cycle with non-azeotropic mixtures, CIESC Journal, 64, 11, pp. 3985-3992, (2013)
  • [14] Yue C., Han D., Pu W., Et al., Thermal matching performance of a geothermal ORC system using zeotropic working fluids, Renewable Energy, 80, pp. 746-754, (2015)
  • [15] Zhou Y.Y., Duo X.Z., Yang L.J., Et al., Heat transfer characteristics of zeotropic mixtures in an ORC evaporator heated by exhaust gas, Proceeding of the CSEE, 33, 8, pp. 9-15, (2013)
  • [16] Andreasen J.G., Larsen U., Knudsen T., Et al., Selection and optimization of pure and mixed working fluids for low grade heat utilization using organic Rankine cycles, Energy, 73, 9, pp. 204-213, (2014)
  • [17] Zhang J.H., Liu J.F., Chen Q.H., Optimal evaporating temperature and exergy analysis for organic Rankine cycle, CIESC Journal, 64, 3, pp. 820-826, (2013)
  • [18] Bao J., Zhao L., A review of working fluid and expander selections for organic Rankine cycle, Renewable & Sustainable Energy Reviews, 24, 10, pp. 325-342, (2013)
  • [19] Li T., Zhang Z., Lu J., Et al., Two-stage evaporation strategy to improve system performance for organic Rankine cycle, Applied Energy, 150, pp. 323-334, (2015)
  • [20] Yu C., Xu J.L., Wang H.R., Influence of heat capacity match between heat transfer fluids on irreversibility of organic Rankine cycle, Journal of North China Electric Power University, 43, 3, pp. 69-75, (2016)
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