Reaction Rate Characteristics of SrBr₂ Hydration System for Chemical Heat Pump Cooling Mode

作     者：Takehiro Esaki Noriyuki Kobayashi Takehiro Esaki;Noriyuki Kobayashi

作者机构：Department of Chemical Engineering Nagoya University Nagoya Japan 

出 版 物：《Journal of Materials Science and Chemical Engineering》 (材料科学与化学工程（英文）)

年 卷 期：2016年第4卷第2期

页      面：106-115页

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 

主　　题：Chemical Heat Pump SrBr₂ Hydration Hysteresis Unreacted-Core Shell Model 

摘      要：Here, we propose a chemical heat pump chiller with a SrBr2 hydration reaction system for utilization of waste heat. The SrBr2 hydration reaction could recover waste heat in low temperatures ranging from 373 K to 353 K, and the system showed good potential in terms of the high cooling thermal-storage density. Previous studies have given little information on the reaction characteristics of the SrBr2 hydration reaction. In this paper, we developed a measuring method for the hydration reaction equilibrium and reaction rate based on the volumetric method. We analyzed the hydration reaction rate with an unreacted-core shell model. In the experiments, the SrBr2 equilibrium temperature observed was equal to the theoretical equilibrium temperature obtained from thermodynamic databases. In addition, the hysteresis gap between the hydration and dehydration values was 2.0 K. Thus, the hysteresis effect was negligible for the chemical heat pump cooling operation. The reaction fraction of the SrBr2 hydration reached 0.7 within 20 s. By analyzing the hydration reaction rate with the unreacted-core shell model, the activation energy value was calculated to be56.6 kJ/mol. The calculation results showed good agreement with those of the experiment as the reaction fraction reached 0.7.