平膜和中空纤维膜储能器放能特性分析
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摘要
储能是太阳能等不稳定热源驱动溴化锂制冷系统中必不可少的措施。针对普通的溴化锂浓度差储能器中由于溶液浓度过高导致结晶的问题,提出了膜储能器基本设想,并建立了中空纤维膜储能器内动态数学模型.根据计算结果,分析了膜通量、溶液温度、溶液质量分数等参数的动态变化特性,同时说明膜储能器的可行性。另外,验证性实验结果验证了数学模型及计算结果的可靠性,并通过数据对比分析了平膜和中空纤维膜储能器放能特性.
Energy storage is an indispensable part of the lithium bromide refrigeration system driven by unstable energy such as solar energy. To overcome the crystallization in the traditional lithium bromide concentration difference energy accumulators,the membrane energy accumulators were proposed. The thermodynamic mathematic model of a hollow fiber membrane energy accumulator was built. Based on the calculation results, the thermodynamic characteristics of the membrane flux, temperature and mass fraction of the solution were analyzed. The feasibility of the membrane energy accumulator was verified. Additionally, the accuracy of the model and calculation results was verified by the experimental results. The characteristics of the flat membrane and hollow fiber membrane energy accumulators during the energy discharging was compared and analyzed.
Energy storage is an indispensable part of the lithium bromide refrigeration system driven by unstable energy such as solar energy. To overcome the crystallization in the traditional lithium bromide concentration difference energy accumulators,the membrane energy accumulators were proposed. The thermodynamic mathematic model of a hollow fiber membrane energy accumulator was built. Based on the calculation results, the thermodynamic characteristics of the membrane flux, temperature and mass fraction of the solution were analyzed. The feasibility of the membrane energy accumulator was verified. Additionally, the accuracy of the model and calculation results was verified by the experimental results. The characteristics of the flat membrane and hollow fiber membrane energy accumulators during the energy discharging was compared and analyzed.
引文
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[2] Xu S M, Huang X D, Du R. An Investigation of the Solar Powered Absorption Refrigeration System with Advanced Energy Storage Technology[J]. Solar Energy, 2011, 85(9):1794-1804
[3] Xu S M, Xu C H, Zhang L, et al. Numerical Simulation of an Advanced Energy Storage System Using H_2O-LiBr as Working Fluid, Part 1:System Design and Modeling[J].International Journal of Refrigeration, 2007, 30(2):354-363
[4]石巧慧,张华,王子龙,耿直.溴化锂吸收式制冷机组的防结晶保护分析[J].暖通空调,2010, 40(2):88-91Shi Qiaohui, Zhang Hua, Wang Zilong, Geng Zhi. AntiCrystallization Protection of Lithium Bromide absorption Type Refrigeration Machines[J]. Journal of HV&AC,2010, 40(2):88-91
[5]尹洪超,靳兵,赵亮.溴化锂水溶液的结晶控制及应用对策[J].能源技术,2008, 29(1):45-47Yin Hongchao, Jin Bing, Zhao Liang. The Crystallization of LiBr Absorption System and Control Strategies[J]. Energy Technology, 2008, 29(1):45-47
[6]李畅,李保安.减压膜蒸馏过程模拟及通量强化研究[D].天津:天津大学,2013Li Chang, Li Baoan. Numerical Simulation and Flux Enhancement Research of Vacuum Membrane Distillation[D]. Tianjin:Tianjin University, 2013
[7]朱春燕,赵之平,刘殿忠,等.膜蒸馏过程传递机理研究进展(Ⅲ)真空膜蒸馏[J].膜科学与技术,2009, 29(6):99-104Zhu Chunyan, Zhao Zhiping, Liu Dianzhong, et al.Progress in Research on Transfer Mechanism in Membrane Distillation on(Ⅲ)Vacuum Membrane Distillation[J].Membrane Science and Technology, 2009, 29(6):99-104
[8]童国柱,李保安.减压膜蒸馏过程模拟及组件优化[D].天津:天津大学,2011Tong Guozhu, Li Baoan. Simulation and Component Optimization of Vacuum Membrane Distillation Process[D].Tianjin:Tianjin University, 2011
[9]高振.真空膜蒸馏传递机理和过程特性研究[D].天津:天津大学,2003Gao Zhen. Transfer Mechanism of Vacuum Membrane Distillation and Process Characteristics Research[D].Tianjin:Tianjin University, 2003
[10] Iversen S B, Bhatia V K, Dam-Johansen K. Characterization of Micro-Porous Membranes for use in Membrane Contactors[J]. Journal of Membrane Science, 1997, 130(1/2):205-217
[11] Kaita Y. Thermodynamic Properties of Lithium Bromidewater Solutions at High Temperatures[J]. International Journal of Refrigeration, 2001, 24(5):374-390