Effect of mass concentration of composite phase change material CA-DE on HCFC-141b hydrate induction time and system stability

2017 International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Li, Juan^1 ; Sun, Zhigao^1 ; Liu, Chenggang^1 ; Zhu, Minggui^1

School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu, China^1

关键词: Aliphatic hydrocarbons;    Composite phase change materials;    Environment friendly;    Industrial practices;    Mass concentration;    Peak load shifting;    Phase change temperature;    Temperature reduction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/322/2/022002/pdf
DOI  :  10.1088/1757-899X/322/2/022002

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

HCFC-141b hydrate is a new type of environment-friendly cold storage medium which may be adopted to balance energy supply and demand, achieve peak load shifting and energy saving, wherein the hydrate induction time and system stability are key factors to promote and realize its application in industrial practice. Based on step cooling curve measurement, two kinds of aliphatic hydrocarbon organics, n-capric acid (CA) and lauryl alcohol (DE), were selected to form composite phase change material and to promote the generation of HCFC-141b hydrate. Five kinds of CA-DE mass concentration were chosen to compare the induction time and hydration system stability. In order to accelerate temperature reduction rate, the metal Cu with high heat conductivity performance was adopted to conduct out the heat generated during phase change. Instability index was introduced to appraise system stability. Experimental results show that phase change temperature and sub-cooling degree of CA-DE is 11.1°C and 3.0°C respectively, which means it is a preferable medium for HCFC-141b hydrate formation. For the experimental hydration systems, segmented emulsification is achieved by special titration manner to avoid rapid layering under static condition. Induction time can achieve up to 23.3min with the densest HCFC-141b hydrate and the lowest instability index, wherein CA-DE mass concentration is 3%.