Thermal performance and economic evaluation of NaCl-CaCl2 eutectic salt for high-temperature thermal energy storage

作者：Tian, Heqing; Wang, Weilong^*; Ding, Jing; Wei, Xiaolan

来源：Energy, 2021, 227: 120412.

DOI：10.1016/j.energy.2021.120412

• Thermal energy storage
• Phase change materials
• Chloride salt
• Thermal property
• Economic analysis

Molten salts have been widely used as a kind of high-temperature thermal energy storage materials taking its advantage of high heat storage density and good stability. In this paper, the eutectic chloride salt (NaCl-CaCl2, 52-48mol.%) was prepared by a statically mixing method assessing its thermal energy storage performance for concentrating solar power (CSP) plants. The thermal properties were all determined experimentally by thermal analysis methods including melting temperature, latent heat, specific heat capacity, density, thermal expansion coefficient, thermal diffusivity and thermal conductivity. The measurement results showed that the eutectic salt has a suitable melting temperature of 512.8 degrees C and high latent heat of 178.4 J/g. Moreover, it exhibited an excellent thermal stability below 858 degrees C with no significant mass changes. Both high heat storage density and low cost price promoted its potential application for high-temperature thermal energy storage.

• 单位
  中山大学; 郑州大学