Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 208, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2019.110390
Keywords
Long-term energy storage; PCM; Stable supercooling; Surface free energy
Funding
- National Natural Science Foundation of China [51876004]
- Natural Science Foundation of Guangdong Province [2018A030310515]
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A novel method of microcosmic-visualizing was employed in investigating the supercooling stability of a phase change material (PCM). The supercooling behavior of the PCM under circumstances of different surface free energy was studied both dynamically and statically, and a theory analysis of how the surface free energy of the substrate affects the stable supercooling of PCM was carried out. The results showed that, the PCM droplets phase changed after a 20-cm free fall on substrate with larger surface free energy, while remained supercooled on substrate with lower surface free energy. The PCM in PTFE container initiated crystallization at -8.99 degrees C, withstood over 400% on hours at liquid state compared with the sample in glass container, while a large supercooling degree of over 57 degrees C was achieved. It indicated that containers made of materials with lower surface free energy could be considerably beneficial in stabilizing supercooling of PCMs, which could give a guide to the practical application on long-term energy storage of PCMs. What is more, the surface free energy theory also works on the air-liquid interface. The oil-covered PCM sample withstood a temperature of 5 degrees C for 10 months without crystalized in a refrigerator, showing great potential on supercooling stabilization.
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