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相变储能可应用在许多领域.相变材料(PCM)的热物性对其筛选和应用有重要意义.PCM的比热和潜热的测量方法一般可分成3类:常规卡计法、差热分析法(DTA)和差示扫描量热法(DSC).虽然DTA和DSC法优点很多,但缺点也是明显的:所用试剂很少(1～10mg),导致试剂的热物性常常与实际应用中的大块材料和热物性有差别;不能测定导热系数和热扩散率.常规卡计法几乎都不能同时测定多种PCM试样的比热、潜热、凝固点和导热系数,且PCM的相变过程不易观察.鉴于上述,我们发展了一种能够测定多组相变材料凝固点、比热、潜热、导热系数和热扩散系数的新方法——参比温度曲线法.
Phase change energy storage can be applied in many fields.The thermophysical properties of phase change material (PCM) are of great significance to its screening and application.The measurement methods of specific heat and latent heat of PCM are generally divided into three categories: conventional card counting method, differential heat Analysis (DTA) and Differential Scanning Calorimetry (DSC). Although the advantages of DTA and DSC are many, the disadvantages are also obvious: very few reagents are used (1 to 10 mg), resulting in the thermophysical properties of the reagents often being used in practice Of the bulk material and thermal properties are different; can not determine the thermal conductivity and thermal diffusivity. Conventional card counting method can not simultaneously determine the specific heat of a variety of PCM samples, latent heat, freezing point and thermal conductivity, and PCM phase change process Not easy to observe.In view of the above, we developed a new method that can measure the freezing point, specific heat, latent heat, thermal conductivity and thermal diffusivity of multiple sets of phase change materials - reference temperature curve method.