针对太阳能利用、余热利用、集中供暖等应用背景,采用差示扫描量热法（DSC）遴选了一种相变温度合适（相变峰值87℃）、相变潜热值较大（203.9J/g）的工业石蜡,并以此为相变材料,采用非离子型乳化剂及助乳剂复配的方法研制了3种浓度的石蜡乳状液高温潜热输送材料。测定了石蜡乳状液高温潜热输送材料的相变点、相变潜热等热物性,并研究了其蓄热特性。结果表明,该材料是一种在80～90℃之间存在相变的储、传热工质,在相变区间内的储、载热密度远大于水,是一种良好的潜热输送材料。
To match the temperature range of central heating systems,several types of commercial grade paraffin with melting points have been investigated as the candidate phase change material（PCM）.And the thermal behavior of the paraffin was tested.According to the phase change temperature difference and heat of fusion,the paraffin with the melting point at 87℃,latent heat of 203.9J/g,phase change temperature range of 80-90℃ was selected as the best phase change material.Paraffin emulsions were prepared by mixing non-ionic surfactants and co-surfactants.Thermal physical properties of these paraffin emulsions such as phase transition temperature and latent heat were tested.Because paraffin emulsions can store their latent heat during phase change process in the temperature range of 80-90℃,their heat storage density their and heat carrier density are higher than water.Based on that,paraffin emulsions are suitable for latent heat transportation.
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