【作者】 张曼； 方贵银； 吴双茂； 杨帆；

【Author】 Zhang Man,Fang Guiyin,Wu Shuangmao,Yang Fan (Department of Physics,Nanjing University,Nanjing 210093,Jiangsu,China)

【机构】 南京大学物理系；

【摘要】 本文通过实验对四丁基溴化铵(TBAB)溶液的蓄冷结晶过程进行了测试,结果表明TBAB溶液的凝固温度随其浓度的改变而改变,在25%—45%的浓度范围内,其凝固温度位于5.8—9.3℃范围内。选取相变温度适宜、相变过程稳定、浓度为40%的TBAB溶液,向其添加硼砂成核剂,测试其相变温度和相变潜热,测试结果表明质量浓度为2%的硼砂在不影响TBAB溶液凝固温度的情况下可以降低其结晶过冷度2.4℃。采用示差扫描量热仪(DSC)测试TBAB溶液的熔解潜热为187.030kJ/kg。因此TBAB溶液是一种高效的空调蓄冷材料。更多还原

【Abstract】 The crystallization progress of tetra-n-butylammonium bromide solution is tested. The results indicate that the freezing points of TBAB solutions change with the concentrations. The freezing point of TBAB solution changes between 5.8℃ and 9.3℃ while the TBAB solution concentration changes from 25% to 45%. As a nucleating agent, natrium biboricum is added into the TBAB solution with the concentration of 40%, which has the proper phase-change point and stable phase-change process. Then the phase-change point and latent heat were tested. The results indicate natrium biboricum, which has the concentration of 2%, reduces the supercooling of TBAB solution crystallization for 2.4℃ without changing the freezing points of TBAB solution. Differential scanning calorimetry (DSC) is used to test the melting latent heat of TBAB solution and the melting latent heat is 187.030kJ/kg. Thus TBAB solution is an efficient cool storage material for air conditioning system.更多还原