Stability of Heat Storage Capacity for Phase Change Material Na2HPO4.12 H2O Thickening And Gelling Methods

DICP OpenIR

学科主题	物理化学
	Stability of Heat Storage Capacity for Phase Change Material Na2HPO4.12 H2O Thickening And Gelling Methods
	Lan XZ(蓝孝征); Tan ZC(谭志诚); 孙立贤等
会议名称	18th IUPAC Conference on Chemical Thermodynamics and The 12th National Conference on Chemical Thermodynamics and Thermal Analysis
会议日期	2004-8-17
	2004-08-17
会议地点	中国
页码	308/1
部门归属	十五室
主办者	中国化学会
英文摘要	Disodium hydrogen phosphate dodecahydrates (Na2HPO4×12H2O) is a candidate phase change material with a heat of fusion 260~280 J/g. But its melting process is incongruent which leads to continuous lowering of heat storage capacity during thermal cycling. Adding thickening agent or in-situ synthesizing polyelectrolyte, e.g. polyacrylate, to its melt can help to prevent the phase separation to some extent. Heat of fusion of pure Na2HPO4×12H2O decreased from ~200 J/g to ~25 J/g in a four-time freeze-thaw cycling. A rubbery mixture containing sodium alginate 3-5%(w/w), Na2HPO4×12H2O and a certain amount of water shows constant heat storage capacity in five times thermal cycles. A gel was obtained through polymerizing of sodium acrylate in the melt of Na2HPO4×12H2O and water at 50℃. Solid dodecahydrates salt with the in-vivo synthesized polyacrylate sodium exhibited stable heat of fusion. Optimum components for the synthesis of polyacrylate sodium to obtain the gel-like product composed of sodium acrylate 3-5%(w/w) with pH＝7, N,N’-methylenebisacrylamide 0.1-0.2%(w/w), K2S2O8 and Na2SO3(mass ratio 1:1) 0.06-0.12%(w/w). Solid gelled hydrate with crystal size less than 0.2mm possesses stable thermal storage property. TG analysis of pure and gelled Na2HPO4×12H2O presented a different thermal stability.
语种	中文
文献类型	会议论文
条目标识符	http://cas-ir.dicp.ac.cn/handle/321008/111788
专题	中国科学院大连化学物理研究所
通讯作者	Lan XZ(蓝孝征)
推荐引用方式 GB/T 7714	Lan XZ,Tan ZC,孙立贤等. Stability of Heat Storage Capacity for Phase Change Material Na2HPO4.12 H2O Thickening And Gelling Methods[C],2004:308/1.