Abstract
The utilization of phase change material (PCM) of lauric acid (LA) in thermal energy storage system is limited by liquid phase leakage and relatively low thermal conductivity. Therefore, a novel composite PCM of LA@Cu/Attapulgite was prepared in order to overcome the aforementioned issues. Herein, the nano-Cu were firstly to disperse into LA with different loadings (1, 2, 3 and 4 wt.%,) by ultrasonic dispersion method to form the PCM of LA@Cu. Then, LA@Cu was combined with the supporting material of attapulgite by vacuum impregnation method. The results show that LA@Cu with 2 wt.% of Cu has the best dispersion of Cu with good thermal properties and high thermal conductivity (0.33 W/(m·K)). The composite PCM of LA@Cu/Attapulgite melted/solidified at 42.1 °C/40.6 °C with the melting/solidification latent heat of 87.1 J/g/86.2 J/g, and exhibited good thermal stability and thermal reliability. The thermal conductivity of LA@Cu/Attapulgite reached 0.46 W/(m·K) which was synergistically enhanced by Nano-Cu and attapulgite. The above results indicated that the composite PCM of LA@Cu/Attapulgite have potential application in energy conservation of buildings.
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