Thermodynamic Analysis of Packed Bed Thermal Energy Storage System  

作　　者：GUO Huan XU Yujie GUO Cong CHEN Haisheng WANG Yifei YANG Zheng HUANG Ye DOU Binlin 

机构地区：[1]Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of the Built Environment,University of Ulster,Co.Antrim BT370QB,UK [4]School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China

出　　处：《Journal of Thermal Science》2020年第2期445-456,共12页热科学学报（英文版）

基　　金：The authors acknowledge the support provided by National Key R&D plan(No.2017YFB0903605);National Natural Science Foundation of China(No.51806210);Newton Advanced Fellowship of the Royal Society(No.NA 170093);International Partnership Program,Bureau of International Cooperation of Chinese Academy of Sciences(No.182211KYSB20170029).

摘　　要：A packed-bed thermal energy storage(PBTES) device, which is simultaneously restricted by thermal storage capacity and outlet temperatures of both cold and hot heat transfer fluids, is characterized by an unstable operation condition, and its calculation is complicated. To solve this problem, a steady thermodynamics model of PBTES with fixed temperatures on both ends was built. By using this model, the exergy destruction, thermocline thickness, thermal storage capacity, thermal storage time, and other key parameters can be calculated in a simple way. In addition, the model explained the internal reason for the change of thermocline thickness during thermal storage and release processes. Furthermore, the stable operation of the PBTES device was analyzed, and it was found that higher inlet temperature of hot air, and lower temperature difference between cold and hot air can produce less exergy destruction and achieve a larger cycle number of stable operation. The work can be employed as the basis of the design and engineering application of PBTES.A packed-bed thermal energy storage(PBTES) device, which is simultaneously restricted by thermal storage capacity and outlet temperatures of both cold and hot heat transfer fluids, is characterized by an unstable operation condition, and its calculation is complicated. To solve this problem, a steady thermodynamics model of PBTES with fixed temperatures on both ends was built. By using this model, the exergy destruction, thermocline thickness, thermal storage capacity, thermal storage time, and other key parameters can be calculated in a simple way. In addition, the model explained the internal reason for the change of thermocline thickness during thermal storage and release processes. Furthermore, the stable operation of the PBTES device was analyzed, and it was found that higher inlet temperature of hot air, and lower temperature difference between cold and hot air can produce less exergy destruction and achieve a larger cycle number of stable operation. The work can be employed as the basis of the design and engineering application of PBTES.

关 键 词：packed BED thermal energy storage THERMOCLINE STEADY THERMODYNAMIC analysis STABLE operation 

分 类 号：TK11[动力工程及工程热物理—热能工程]