Journal
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Volume 100, Issue -, Pages 454-462Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2018.11.025
Keywords
Phase change materials; Cool thermal energy storage; Cooling rate; Solidification; Subcooling
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Funding
- Technology Mission Division [DST/TMD/MES/2k16/98]
- Department of Science and Technology, Government of India
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This work aims to investigate the solidification behavior of de-ionized (DI) water as the base phase change material (PCM) dispersed with various mass fractions of sodium chloride and D-sorbitol in a spherical encapsulation. The DSC analysis of water illustrated that subcooling of DI water increases with respect to cooling rate due to inadequate time to complete the crystallization. The solidification experiments were carried out at a bath temperature of -7 degrees C and DI water undergoes a subcooling of -5.4 degrees C. However, the subcooling substantially reduced to -2.8 degrees C for DI water with 0.5 wt. % sodium chloride and 1 wt. % of D-sorbitol. Accelerated mode of charging prevails in all the PCM samples and the innermost 6% of volume got solidified in decelerated mode. The cooling rate is found to decrease with respect to increase in concentration of the dispersants in subcooling region, but at a particular concentration both dispersants provide the enhanced cooling rate for a given driving potential than DI water. It is concluded that reduction of subcooling and partial charging of water based PCMs would be helpful to enhance the energy efficiency of the cool thermal energy storage (CTES) system. (C) 2018 Elsevier Ltd and IIR. All rights reserved.
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