Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 146, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2019.118836
Keywords
Solidification; Natural convection; Ice storage; Parametric optimization
Categories
Funding
- National Natural Science Foundation of China [51725602, U1737104]
- Natural Science Foundation of Jiangsu Province [BK20170082]
- 'six talent peaks' project of Jiangsu Province [XNY042]
- 'Zhishan Young Scholar' Program of Southeast University
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The present paper reports on a numerical study of the ice storage process in finned shell-tube ice storage (STIS) units, with a focus on the special solidification behavior using water as the phase-change material (PCM). The proposed model is experimentally verified using an energy-discharging process in an ice storage unit. The effects of natural convection and buoyancy reversal on the solidification behavior are examined and investigated. Moreover, the Taguchi method is utilized to optimize the fin geometry of STIS units. The results indicate that the natural convection and buoyancy reversal are negatively correlated with the ice storage performance. An increase of the superheat factor leads to the enhancement of the buoyancy reversal intensity, which is not conducive to the acceleration of the solidification rate. In addition, the increases in fin height, fin width, and fin number are positively correlated with ice storage performance. It is demonstrated that the fin height is the dominant factor affecting the overall ice storage performance, and it is independent of the superheat factor. From the perspective of trade-off between ice storage rate and ice storage capacity, the optimal fin parameters for the STIS unit are fin height H = 40 mm, fin number N = 10, fin width Delta = 3 mm for engineering applications. (C) 2019 Elsevier Ltd. All rights reserved.
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