Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6687248 | Applied Energy | 2015 | 6 Pages |
Abstract
Ternary eutectic chloride (NaCl-CaCl2-MgCl2)/expanded graphite (EG) composites were prepared for thermal energy storage applications at a solar thermal power plant. Heat capacity and latent heat thermal energy storage (LHTES) characteristics of the composites including the melting temperature and latent heat capacity were investigated using a differential scanning calorimetry (DSC) technique, and the effects of EG additives in the composite on thermal conductivities were evaluated using a hot disk analyzer. The ternary eutectic chloride/EG composites with expanded volumes ranging from 150 to 250Â g/L and the EG mass fractions ranging from 0 to 5Â wt% were prepared by absorbing liquid chlorides into the EG at high temperature. Experimental results indicated that the specific heat capacity of solid composites decreased with EG mass fraction and temperature. In the liquid state, the effect of the EG loading on the specific heat was not uniform. Specific heat capacity reached maximum at 1Â wt% of EG loading and the specific heat capacities of all samples rose with temperature. The melting temperatures of the composites were the same as the pure ternary eutectic chloride, but the phase change latent heat decreased with the mass percentages of EG in the composites. The thermal conductivities of the composites were 1.35-1.78 times higher than that of the pure ternary eutectic chloride.
Related Topics
Physical Sciences and Engineering
Energy
Energy Engineering and Power Technology
Authors
Heqing Tian, Weilong Wang, Jing Ding, Xiaolan Wei, Ming Song, Jianping Yang,