Abstract
Lauric acid (LA) and myristic acid (MA) were used to prepare a binary eutectic mixture. The expanded graphite (EG) was used as the carrier, and the lauric–myristic acid/expanded graphite (LA–MA/EG) composite phase change material was prepared by physical adsorption method. The microstructure, chemical structure, and thermal properties of LA–MA/EG were characterized by scanning electron microscopy (SEM), differential scanning calorimeter (DSC), Fourier transform infrared spectroscopy (FTIR), and thermal conductivity measurement. The experimental results have shown that the maximum mass ratio of the binary eutectic mixture in the LA–MA/EG composite phase change energy-storing material was 92.2%, and there was physical mixing and has no chemical reaction between LA–MA and EG. The fusion point temperature of LA–MA/EG was 33.4°C, the solidification point temperature was 33.8°C, and the latent heat was 171.1 J/g, which was suitable for building energy storage field. After several thermal cycles, the change of the fusion point and potential heat of the composite phase change materials were very small, and it still has good energy storage performance.
Highlights
Because of the growing energy shortage in today’s society, it is important to improve the effective utilization of traditional energy gradually; the development and application of new energy resources such as solar energy are significant
The Lauric acid (LA)–myristic acid (MA) binary eutectic mixture as Phase change materials (PCMs) and expanded graphite (EG) as adsorption material, an LA–MA/EG composite PCM was prepared by physical adsorption method, and its thermal properties were characterized
The results showed that the mixture between the LA–MA and EG was physically blended without chemical reaction
Summary
Because of the growing energy shortage in today’s society, it is important to improve the effective utilization of traditional energy gradually; the development and application of new energy resources such as solar energy are significant. Latent heat energy storage technology utilizes the characteristics of heat energy release and absorption of PCMs during the transition between solid phase and liquid phase [7, 8], to achieve the goal of energy storage, temperature control, and energy recovery and reuse and balance the contradiction between energy supply and demand [9] It has the advantages of high potential heat of phase transition, high energy storage density, and stable temperature output and has a broad application prospect in many fields such as building energy conservation [10, 11], solar energy utilization [12,13,14], recycling and utilization of industrial
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