相变储能材料六水氯化钙的储热性能优化研究

Calcium Chloride Hexahydrate Phase Change Material with Enhanced Thermal Performance for Energy Storage

中文关键词:  相变储能材料  水合盐  六水氯化钙  步进稀释法  潜热存储能力

英文关键词:Phase change materials  Hydrated salt  Calcium chloride hexahydrate  Step dilution method  Latent heat storage capacity

中文摘要:

      六水氯化钙(CaCl2?6H2O)的相变温度约为29 ℃，相变潜热约180.0～190.8 J/g，因其潜热高，成本低，无毒等优点广泛应用于建筑材料中，但CaCl2?6H2O在实际应用中存在着储热性能差、衰减严重等缺点。通过差示扫描量热法(DSC)、原子力显微镜(AFM)、X射线衍射法(XRD)对比了CaCl2?6H2O在改性前后的潜热性能、形貌及晶体结构差异。结果表明，通过对CaCl2?6H2O的水含量进行精确调控，材料的相变潜热从158.6 J/g提升至194.8 J/g，潜热存储能力得到极大的提升。

英文摘要:

      Calcium chloride hexahydrate (CaCl2?6H2O) has a phase change temperature of approximately 29 ℃ and a phase change latent heat of about 180.0 - 190.8 J/g. It is widely used in building materials owing to the high latent heat， low cost and non-toxicity. However， CaCl2?6H2O has some disadvantages in practical applications， such as poor heat storage performances and serious degradation. Characterized by differential scanning calorimetry (DSC)， atomic force microscopy (AFM) and X-ray diffraction (XRD)， the latent heat storage capacities， morphologies， and structures of CaCl2?6H2O before and after modification were compared. The results show that the latent heat storage capacity has been improved significantly， from the initial value of 158.6 J/g to 194.8 J/g， through precise water control in CaCl2?6H2O.