基于Fluent的相变储能换热器回路仿真分析
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摘要
研究了一种相变储能换热器。基于流体仿真软件,对其换热过程中的整个回路进行了建模分析。主要研究了相变材料液相分数及关键位置温度随时间变化的特性,并对比了不同相变材料导热系数及流体回路质量流速对控温特性的影响。研究发现,熔化工况时,导热系数的提高可以加速相变材料熔化速率,同时有效改善相变换热器的运行温度水平及稳定性;而流速的提高可以降低运行温度但同时会降低稳定性。凝固工况时,导热系数和流速的提高均有利于加速相变材料凝固。采用该种回路仿真分析方法可为储能换热器的设计和优化提供指导。
In this paper, a phase change energy storage heat exchanger was researched. The whole loop in the heat transfer process was analyzed based on fluid simulation software. Primary studies on the state of phase change materials melting/solidification and the temperature variation characteristics of critical position over time were taken, as well as the influence on temperature control properties of different phase change materials thermal conductivity and fluid loop mass velocity was compared. It is found that the increase of thermal conductivity can accelerate the melting rate of phase change material, lower the operating temperature and improve temperature stability of the phase change heat exchanger. The increase in velocity can reduce the operating temperature but also the stability. The increase of thermal conductivity and flow velocity both can accelerate the solidification of phase change materials. The method of whole loop simulation can be taken as a guidance for the design and optimization of energy storage heat exchanger.
In this paper, a phase change energy storage heat exchanger was researched. The whole loop in the heat transfer process was analyzed based on fluid simulation software. Primary studies on the state of phase change materials melting/solidification and the temperature variation characteristics of critical position over time were taken, as well as the influence on temperature control properties of different phase change materials thermal conductivity and fluid loop mass velocity was compared. It is found that the increase of thermal conductivity can accelerate the melting rate of phase change material, lower the operating temperature and improve temperature stability of the phase change heat exchanger. The increase in velocity can reduce the operating temperature but also the stability. The increase of thermal conductivity and flow velocity both can accelerate the solidification of phase change materials. The method of whole loop simulation can be taken as a guidance for the design and optimization of energy storage heat exchanger.
引文
[1]Xing-Yuan Miao,Tianyuan Zhen,Uwe-Jen Gorke,Olaf Kolditz,Thomas Nagel.Thermo-mechanical analysis of heat exchanger design for thermal energy storage systems[J].Applied Thermal Engineering,2017(114):1082-1089.
[2]麻才新,盛强,童铁峰.一种空间相变换热器热设计与仿真分析及其改进[J].空间科学学报,2018,38(3),409-417.
[3]Jose P D C,Eames P.Thermal energy storage for low and medium temperature applications using phase change materials-A review[J].Applied Energy,2016(177):227-238.
[4]李淋,徐青山,蒋菱,等.太阳能地源热泵联合供热水系统TRNSYS模拟与研究[J].电网与清洁能源,2017,33(9):124-130.
[5]Teggar M,Mezaache E H.Numerical Investigation of a PCM Heat Exchanger for Latent Cool Storage[J].Energy Procedia,2013(36):1310-1319.
[6]Shokouhmand H,Kamkari B.Numerical Simulation of Phase Change Thermal Storage in Finned Double-Pipe Heat Exchanger[J].Applied Mechanics & Materials,2012(232):742-746.
[7]Esapour M,Hosseini M J,Ranjbar A A,et al.Phase change in multi-tube heat exchangers[J].Renewable Energy,2016(85):1017-1025.
[8]曲乐,贾林祥.相变换热混合工质板翅式换热器流动与传热数值模拟[J].低温技术,2008,36(4),23-28.
[9]韩广顺,丁红胜,童莉葛.列管式相变储能换热器强化换热的数值研究[J].工程热物理学报,2016,9(36):2012-2018.
[10]莫冬传,吕树申,何振辉.相变蓄冷换热器的优化设计[J].工程热物理学报,2015,36(1):175-178.
[11]阮世庭,张济民,曹建广,等.板式相变储能换热器流动与换热性能实验研究[J].节能技术,2018,3(36),229-233.
[2]麻才新,盛强,童铁峰.一种空间相变换热器热设计与仿真分析及其改进[J].空间科学学报,2018,38(3),409-417.
[3]Jose P D C,Eames P.Thermal energy storage for low and medium temperature applications using phase change materials-A review[J].Applied Energy,2016(177):227-238.
[4]李淋,徐青山,蒋菱,等.太阳能地源热泵联合供热水系统TRNSYS模拟与研究[J].电网与清洁能源,2017,33(9):124-130.
[5]Teggar M,Mezaache E H.Numerical Investigation of a PCM Heat Exchanger for Latent Cool Storage[J].Energy Procedia,2013(36):1310-1319.
[6]Shokouhmand H,Kamkari B.Numerical Simulation of Phase Change Thermal Storage in Finned Double-Pipe Heat Exchanger[J].Applied Mechanics & Materials,2012(232):742-746.
[7]Esapour M,Hosseini M J,Ranjbar A A,et al.Phase change in multi-tube heat exchangers[J].Renewable Energy,2016(85):1017-1025.
[8]曲乐,贾林祥.相变换热混合工质板翅式换热器流动与传热数值模拟[J].低温技术,2008,36(4),23-28.
[9]韩广顺,丁红胜,童莉葛.列管式相变储能换热器强化换热的数值研究[J].工程热物理学报,2016,9(36):2012-2018.
[10]莫冬传,吕树申,何振辉.相变蓄冷换热器的优化设计[J].工程热物理学报,2015,36(1):175-178.
[11]阮世庭,张济民,曹建广,等.板式相变储能换热器流动与换热性能实验研究[J].节能技术,2018,3(36),229-233.