成核剂对蓄冷材料CaCl_(2)溶液过冷度的影响

Influence of nucleating agent on supercooling degree of cold storage material CaCl_(2)solution

以氯化锶、硝酸锶、硝酸铜、硝酸锂、硝酸钴和硝酸铝为成核剂,研究了几种成核剂分别对30%氯化钙溶液过冷度的影响。结果表明,分别添加适量硝酸铜、硝酸锂、硝酸钴、硝酸铝虽能降低30%氯化钙溶液的过冷度,但会降低其相变潜热;而添加1.5%Sr(NO_(3))_(2)或1.0%SrCl_(2)·6H_(2)O成核剂,既能有效地去除30%氯化钙溶液的过冷度,又对其相变潜热基本无影响,是较理想的成核剂。考虑到硝酸盐是无机盐材料中具有防腐性能且相变潜热值和导热系数较高的材料,故选择1.5%Sr(NO_(3))_(2)作成核剂。

Taking SrCl_(2)·6H_(2)O,Sr(NO_(3))_(2),Cu(NO_(3))_(2)·3H_(2)O,LiNO_(3),Co(NO_(3))_(2)·6H_(2)O and Al(NO_(3))3·9H_(2)O respectively as nucleating agent,their effects on the supercooling degree of 30%CaCl_(2)aqueous solution are investigated.The results show that adding appropriate amounts of Cu(NO_(3))_(2)·3H_(2)O,LiNO_(3),Co(NO_(3))_(2)·6H_(2)O and Al(NO_(3))3·9H_(2)O respectively can reduce the supercooling degree of 30%CaCl_(2)aqueous solution,but simultaneously reduce its phase change latent heat.It is ideal to use 1.5%Sr(NO_(3))_(2)or 1.0%SrCl_(2)·6H_(2)O as nucleating agent,which can effectively reduce the supercooling degree but has hardly impact on the phase change latent heat of 30%CaCl_(2)aqueous solution.Since nitrate is a material with anticorrosive performance,higher phase change latent heat and higher thermal conductivity among inorganic salt materials,it is more appropriate to choose 1.5%Sr(NO_(3))_(2)as a nucleating agent for 30%CaCl_(2)aqueous solution.