四丁基溴化铵相变蓄冷材料热物性实验研究

Experimental Study on Thermal Characteristics of Phase-change Material Tetra-n-butylammonium Bromide for Cool Storage

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。

The crystallization progress of tetra-n-butylammonium bromide solution was tested. The results indicate that the freezing point of TBAB solutions changes with concentration. The freezing point of TBAB solution changes from 5.8℃ to 9.3℃ while the concentration changes from 25% to 45%. As a nucleating agent, natrium biboricum was added to the TBAB solution with the concentration of 40%. Then the phase-change point and latent heat were tested. The results show that natrium biborieum with the concentration of 2% reduced the supercooling of TBAB solution crystallization by 2.4℃ without changing the freezing points of TBAB solution. Differential Scanning Calorimetry （DSC） was used to test the melting latent heat of TBAB solution and the melting latent heat was 187.030kJ/kg. Our conclusion is that TBAB solution is an efficient cool storage material for air conditioning systems.