摘要
以氨水为催化剂,乙酰胺作相变材料,采用溶胶-凝胶法制备出有机-无机复合相变蓄热材料。通过改变醇盐-醇-水体系配比及相变材料的加入量来控制蓄热能力和相变温度。采用差示扫描量热仪(DSC)和扫描电镜(SEM)进行表征。结果表明:含相变材料35.8%的复合材料的相变温度为32.0℃,相变潜热高达176.4kJ/kg,经过1500次循环后其相变温度和潜热变化不大。氨水和相变材料对复合材料性能的影响显著:随着氨浓度的增加,复合材料粒径增大;相变材料增多,复合材料储热能力提高,材料致密度增加。
Organic-inorganic phase changed composites were prepared with ammonia as activator and acetamide as PCM by sol-gel method. The thermal storage capacity and phase change temperature were controlled by changing the ratio of alkoxide-alcohol-water system and the amount of PCM. The resulted products were characterized by DSC and SEM. The results show that the composites containing 35.8wt% PCM has a melting temperature of 32.0℃ and latent heat of 176.4kJ/kg. The melting temperature and fusion latent heat of the composites changed slightly after 1500 times＇ thermal cycles. The properties of composites were affected significantly by ammonia and PCM. The particle diameter was augmented with the adding of ammonia. The thermal storage capacity and tightness were increased with the growing of PCM.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2007年第8期901-904,共4页
Acta Energiae Solaris Sinica
关键词
氨水
相变
储热材料
溶胶-凝胶
ammonia
phase change
thermal storage material
sol-gel
