Journal
ENERGY AND BUILDINGS
Volume 183, Issue -, Pages 161-173Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2018.11.018
Keywords
Latent heat thermal energy storage; Heat transfer enhancement; Local double-fin; Shell conductivity
Funding
- National Key Research and Development Program of China [2018YFB0605902]
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Latent heat thermal energy storage (LHTES) with novel fin configuration to enhance heat transfer was proposed. The fins were placed in the lower half of the LHTES unit and were symmetrical along the vertical centerline. A transient two-dimensional numerical model was developed to study the melting characteristics of lauric acid (phase change material, PCM). The local double-fin at different fined angles (theta = 30 degrees, 60 degrees, 90 degrees, 120 degrees, 150 degrees and 180 degrees) were investigated and the results were compared with the uniform double-fin (base case), in which the two fins were placed on the top and bottom. It was found that with special 0, using local double-fin can greatly enhance melting than using the uniformly arranged. The effects of shell conductivity, dimensionless fin length (l) and heat-transfer fluid temperature on PCM melting were investigated. Results showed that the conductivity of shell had a remarkable effect on the melting behaviors and the performance of local double-fin. The complete melting time for the optimum 0 can be saved by 66.7% when the dimensionless fin length increases from 0.50 (optimum at theta = 30 degrees) to 1.00 (optimum at theta = 120 degrees). The complete melting time decreases by 53.1% when heat-transfer fluid temperature increases from 333.15 to 353.15 K under l = 1.00 and theta = 120 degrees Furthermore, it was found that the use of longer fins can improve the LHTES performance more greatly for the local double-fin than that of the base case. (C) 2018 Elsevier B.V. All rights reserved.
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