我国工业余热资源丰富,利用相变换热器回收余热用于建筑供暖为清洁供热提供了可靠的新途径。按不同比例制备了石蜡和硬脂酸二元混合相变材料,并对混合相变材料的相变温度、相变潜热、热导率的变化规律进行了实验研究,旨在寻找适合回收余热用相变换热器的储能材料。研究结果表明,62^#石蜡与硬脂酸混合物的相变温度在43～66℃范围内波动;当62^#石蜡与硬脂酸的配比为20∶80时,相变温度为62.73℃,相变潜热较大,为205.53J/g;二元混合物熔化潜热与凝结潜热相差不大,材料过冷度较小,是用于低温余热回收的相变蓄热换热装置的理想储能材料。将储能材料用于相变换热器中,储能材料熔化回收工业余热进行蓄热,蓄热量用于加热散热器回水,实现间歇性工业余热转变为连续输出热量进行供暖。

China is rich in industrial waste heat resources,the use of phase change heat exchangers to recover waste heat for building heating provides a reliable new way for clean heating.Binary mixed phase change materials of paraffin and stearic acid were prepared in different ratios,and experimental research on the changing rules of phase change temperature,latent heat of phase change,and thermal conductivity of the mixed phase change materials was carried out with the aim of finding suitable energy storage materials for phase change heat exchangers used in waste heat recovery.The results showed that the phase change temperature of 62^# paraffin and stearic acid mixture fluctuated in the range of 43～66℃.When the ratio of 62^# paraffin and stearic acid was 20%∶80%,the phase change temperature was 62.73℃,and the latent heat of phase change was relatively large at 205.53J/g.There was not much difference between the latent heat of melting and the latent heat of condensation of the binary mixture,and the material exhibited minimal subcooling,making it an ideal energy storage material for phase change heat exchangers used for waste heat recovery at low-temperature.In application,the energy storage material is applied in phase change heat exchangers,the energy storage material melts and recovers industrial waste heat for heat storage,and the stored heat is used to heat the radiator backwater,thereby realizing the transformation of intermittent industrial waste heat into continuous output heat for heating.