Subject Area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
Conference Name18th IUPAC Conference on Chemical Thermodynamics and The 12th National Conference on Chemical Thermodynamics and Thermal Analysis
Conference Date2004-8-17
Conference Place中国
Funding Organization中国化学会
AbstractDisodium 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.
Document Type会议论文
Corresponding AuthorLan XZ(蓝孝征)
Recommended Citation
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.
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