In recent years, phase change materials (PCM) are becoming an active
research field in energy utilization and material science. When temperature is
higher than PCM’s phase change point, it will absorb heat; on the contrary it will
release heat when temperature is lower than PCM’s phase change point, which is
essential of phase change. According to its working style, PCM can be divided
into solid-liquid, solid-solid, solid-gas and liquid-gas. Solid-solid phase cha...