相变储能材料的相变过程温度模型

Temperature Model of Phase Change Process of Phase Change Material

基于集总参数法和矩形相变等效比热假设建立了相变材料的相变过程温度模型.该模型与实验结果吻合很好.利用该模型定量研究了环境温度、相变潜热、相变温度范围和换热效率等多种因素对相变行为的影响,初步得出如下结论:环境温度对相变开始时间和持续时间均有明显影响,随着环境温度的升高,该二时间呈指数形式下降;相变材料的潜热对相变开始时间没有影响,对相变持续时间有明显影响,持续时间随潜热线性增加;相变温度范围对相变开始时间也没有影响,而相变持续时间随相变温度范围的增加平缓地增加;相变材料与环境之间的换热效率显著影响相变过程开始和持续的时间,二者随换热效率的提高呈指数形式下降.

Based on lumped parameter method and assumption of rectangular effective specific heat for phase change process, a temperature model of phase change process of ptuzse change material is established. After experimental verification, the model is used to study the influences of ambient temperature, latent heat, phase change temperature span and the efficiency, heat exchange between phase change material and environment on the phase change behavior （in terms of starting time and duration）. Analysis results indicate that the starting time and duration of phase change process decrease in a sharp exponential style with the increase of ambient temperature, that latent heat does not influence the starting time, but has a linear influence on the duration, that the phase change temperature span does not influence the starting time, and the duration increases gradually with the phase change temperature span and that the exchange of heat efficiency between the phase change material and environment influences the starting time and duration in a sharp decreasing exponential style.