Stability of Heat Storage Capacity for Phase Change Material Na2HPO4.12 H2O Thickening And Gelling Methods
文献类型：会议论文
| 作者 | Lan XZ(蓝孝征) ; Tan ZC(谭志诚) ; 孙立贤等 |
| 出版日期 | 2004-08-17 |
| 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 |
| 会议地点 | 中国 |
| 页码 | 308/1 |
| 通讯作者 | 蓝孝征 |
| 中文摘要 | 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. |
| 会议主办者 | 中国化学会 |
| 学科主题 | 物理化学 |
| 语种 | 中文 |
| 源URL | [http://159.226.238.44/handle/321008/111788]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 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]. 见:18th iupac conference on chemical thermodynamics and the 12th national conference on chemical thermodynamics and thermal analysis. 中国. 2004-8-17. |
入库方式： OAI收割
来源：大连化学物理研究所
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