Preparation and Performance of Capric-Myristic Acid Binary Eutectic Mixtures for Latent Heat Thermal Energy Storages

Abstract

The capric-myristic acid (CA-MA) binary eutectic mixture phase change material (PCM) was prepared for low-temperature latent heat thermal energy storage (LHTES). The thermal properties, thermal stability, and long-term cycling reliability of the PCMs were measured. Differential scanning calorimetry results showed that the CA-MA binary eutectic mixture at the mass ratio (72/28\u2009wt%) indicated a high-performance PCM for its suitable phase change temperature ( : 18.21°C, : 17.40°C) and high latent heat ( : 148.5\u2009J/g, : 134.0\u2009J/g). Thermal gravimetric analysis results indicated that the CA-MA binary eutectic mixture had excellent thermal stability in its operating temperature range. The thermal cycling tests and Fourier transform infrared spectroscopy results revealed that the CA-MA binary eutectic mixture had good long-term cycling thermal chemical reliability. In summary, in terms of thermal property, thermal stability, and reliability, the prepared CA-MA PCM could be applied particularly for low-temperature LHTES systems and backfill materials of ground source heat pump systems.