Heat transfer in a latent heat-storage system using MgCl2·6H2O at the melting point

Increased Melting Heat Transfer in the Latent Heat Energy Storage from the Tube-and-Shell Model to the Combine-and-Shell Model

“…Castell et al [15] conducted research using vertical fins on the outside of the tube; the results show a change in the coefficient of heat transfer when using external fins as a result of the increased heat transfer surface. Choi and Kim [16] compared the use of finned circular tube to a tube without fins and conveyed that the heat transfer from the tube to the PCM was influenced by the natural convection of the melting PCM, especially in the tube system without fins. Zhang and Faghri [17] conducted research using a finned tube on the inside and the results show that the addition of fins on the inside is an efficient way to increase the heat transfer when the heat carrier fluid has a low thermal conductivity.…”

Hybrid thermal storage using coil-encapsulated phase change materials

“…Agyenim and Hewitt carried out an experimental investigation of paraffin wax PCM in a horizontal cylinder encapsulation with an embedded finned tube through which heat transfer fluid in the range 62-77 o C is delivered [12]. They observed different U-values during the charge and discharge phases of 16-23.5Wm -2 K -1 in the charge phase and 15-19.5Wm -2 K -1 during discharge -much lower than Choi and Kim's work with salt hydrate [11] though the experimental set-ups were quite different. The higher U-values in the charge (melting) phase are to be expected in part due to the material having higher conductivity in the solid phase (as shown, for example, in [4]).…”

“…Quantitative research into PCMs and their applications have involved experimental work [11][12][13][14][15][16] and numerical modelling [17][18][19][20][21][22]. Choi and Kim investigated heat transfer using a salt hydrate (magnesium chloride hexahydrate) surrounding plane and externally-finned tube options carrying compressed air as the heat transfer medium [11]. They measured U-values ranging from 160-200Wm -2 K -1 in the conductive region for the plane tube option with ratios of 1.1 -2.1 for finned tubes, depending on fin spacing.…”

Study of the Crystallization and Melting Behavior of a Latent Heat Storage by Computed Tomography

“…The experimental setup of the latent heat storage is based on the single tube designs already used by Choi et al and Nagano et al . It is shown in Fig.…”

“…The heat transfer from a hot or cold medium to the PCM is a big challenge. Choi et al , as well as Nagano et al used a single tube with or without fins to investigate the heat transfer. Their measuring technique required introducing thermocouples into the PCM.…”