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M.M. Kenisarin, et al. Journal of Energy Storage 27 (2020) 101082 numerical results, Ehms et al. [118] suggested the following correla- tion: = LF = [1 (3.8FoSte)1/2]2 (53a) Above in Section 3.2, we considered the results of experimental investigation of the time of complete melting of water and water- polyethylene glycol blends inside a spherical capsule reported by Lago et al. [84]. In this paper, the time of complete solidification has also been studied. The experiment details were described above. Fitting experimental results of PCM solidification duration inside the spherical plastic shell allowed getting the following correlation: tcomplete solidification = 1.09 × 108D2.704 Tbath 1.243 (1 W ) 0.781. (53b) The range of application of correlation (53b) is 0.076 m≤D≤0.131m;0.075(7.5%)≤W≤0.5(50%); −10 °C ≤ Tbath ≤ −25 °C. The comparison of the predicted results with the experimental measurements indicated good agreement and maximum deviation was to be less than 6%. 3.4. Melting and solidification in finned spherical capsules Fan et al. [119] recently have undertaken an experimental and numerical investigation of the constrained melting of PCM in a Fig. 49. Experimental spherical capsule rig with an annular fin [119]. Fig. 50. Variation of the molten fraction with time for various fin heights: a – measured and predicted values versus dimension time; b – measured values versus dimensionless time [119]. 26PDF Image | Journal of Energy Storage 27
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