Journal of South China University of Technology (Natural Science Edition) ›› 2006, Vol. 34 ›› Issue (3): 6-9.

• Chemistry,Chemical & Energy Engineering • Previous Articles     Next Articles

Preparation and Influence Factors of Low-GradeTherma-l Energy StorageMaterial

Wu Hui-jun1  Zhu Dong-sheng1  Wang Sheng-wei2  Wang Chun-hua1   

  1. 1. Key Laboratory of Enhanced Heat Transfer and Energy Conserv ation, theM in istry of Education,South China Univ. of Tech. , Guang zhou 510640, Guangdong, China;2. Dept. o f Building Services Engineering, The Hong Kong Polytechnic Univ. , Hong Kong
  • Received:2005-01-21 Online:2006-03-25 Published:2006-03-25
  • Contact: 吴会军(1978-) , 男, 博士, 主要从事传热与节能、储能材料的研究. E-mail:wuhuijun@ tsinghua. org. cn
  • About author:吴会军(1978-) , 男, 博士, 主要从事传热与节能、储能材料的研究.
  • Supported by:

    国家自然科学基金资助项目( 20346001); 广东省自然科学基金资金项目( 011584); 教育部优秀青年教师资助计划项目; 高等学校博士学科点专项科研基金资助项目

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Abstract:

A composite low-grade thermal-energy storage sorbentw as first prepared by impregnating hygroscopic salt CaCl2 into silica gel. Nex ,the water adsorbing properties of the prepared so rbent and pure silica gel were measured and compared. Then, the corresponding thermal-energy storage properties were investigated in a sorption setup.Finally, the factors affecting the adsorbing properties of the composite so rbent were studied. Experimental resultsshow a proper impregnation period of 4h and an increase in water adsorption and specific thermal-energy storage density with the increases of CaCl2 content and impregnation temperature. It is also indicated that the specific thermal-energy storage density of the composite sorbent increases up to 1050 J /g with the amount of adsorbed water,and that the composite sorbent can be effectively regenerated at 90℃. Therefore, the composite sorbent is feasibleto store and utilize the low-grade thermal energy, such as solar energy and industrial-waste heat.

Key words: composite sorben, tenergy storage, preparation, low-grade heat