Experimental study on enhancement of thermal energy storage with phase-change material

Yang, Jialin; Yang, Linlin; Xu, Chao; Du, Xiaoze

doi:10.1016/j.apenergy.2016.02.028

Cited by 169 publications

(50 citation statements)

References 40 publications

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“…The solid-liquid interface of paraffin developed from the boundary to the inner of the composite, resulting in that the solid paraffin was surrounded by the melted paraffin. The melting processes of the paraffin in the two models were well consistent with the obtained experimental phenomena, which presented that in pore scale, the paraffin near metal fiber melted first and the melting front was parallel to the structure of metal fiber, and with the increase of melting time, the melting front moved to the center of pore structure [22]. The completely melted time of the whole process took 12 s in 2D C-M model, and 7 s in 3D B-P model.…”

Section: Resultssupporting

confidence: 84%

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Numerical and Experimental Studies on the Heat Transfer Performance of Copper Foam Filled with Paraffin

Zheng

Wang

2017

Energies

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Abstract:The pore-scale numerical works on the effective thermal conductivity and melting process of copper foam filled with paraffin, and a phase-change material (PCM) with low thermal conductivity, were conducted by utilizing the two-dimensional (2D) hexahedron Calmidi-Mahajan (C-M) model and the three-dimensional (3D) dodecahedron Boomsma-Poulikakos (B-P) model. The unidirectional heat transfer experiment was established to investigate the effective thermal conductivity of the composite. The simulation results of the effective thermal conductivity of the composite in 2D C-M model were 6.93, 5.41, 4.22 and 2.75 W/(m·K), for porosity of 93%, 95%, 96% and 98% respectively, while the effective thermal conductivity of the composite in 3D B-P model were 7.07, 5.24, 3.07 and 1.22 W/(m·K). The simulated results were in agreement with the experimental data obtained for the composite. It was found that the copper foam can effectively enhance the thermal conductivity of the paraffin, i.e., the smaller the porosity of copper foam, the higher the effective thermal conductivity of the composite. In addition, the Fluent Solidification/Melting model was applied to numerically investigate the melting process of the paraffin in the pore. Lastly, the solid-liquid interface development, completely melted time and temperature field distribution of paraffin in the pore of copper foam were also discussed.

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Section: Resultssupporting

confidence: 84%

“…It was proved that the convection of melted paraffin in different pores was negligible [22]. The reason was that the pore size of the metal foam was very small, and its existence might cause the flow resistance in the domain.…”

Section: Melting Process Simulationmentioning

confidence: 99%

Numerical and Experimental Studies on the Heat Transfer Performance of Copper Foam Filled with Paraffin

Zheng

Wang

2017

Energies

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“…Basically, DSC curve of PCM has characteristic two endothermic peaks. The first peak at low temperature is due to solid-solid transition of PCM whereas the second peak at phase transition temperature is due to solid-liquid transition 20 . The enthalpy of fusion is calculated by numerical integration of the area under the peak of thermal transition.…”

Section: Confirmation Tests For Encapsulationmentioning

confidence: 99%

Microencapsulation of Paraffin Wax Microspheres with Silver

et al. 2018

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Microencapsulation of phase change materials (PCMs) with metallic shell materials is a very innovative and challenging task. This can mitigate the problems related to thermal barrier for conventional nonconductive shell materials as well as enhance mechanical properties of PCM microcapsules. Such microcapsules can be integrated into microelectronic devices for their intermittent thermal management in mission critical components. The present work is aimed at developing a new method to synthesise phase change material encapsulated with metallic shell material and characterising the same. Paraffin wax microspheres were first synthesised and then encapsulated with silver through in situ chemical reduction. Further more, a new set of experiments were identified to analyse the quality of encapsulation. The thermal properties were investigated under differential scanning calorimeter and thermogravimetric analyser. The average diameter of paraffin wax microspheres (PW) is found to be ±329 µm. It reveals from DSC analysis that the enthalpy of fusion is minimum for PW@Ag-PVA amongst all others. Accordingly, higher deposition of Ag is possible for PW@Ag-PVA. This is also supported by TGA results where PW@Ag-PVA has only 40 per cent mass loss and the remaining samples have 100 per cent. However, even for PW@Ag-PVA the encapsulation is found incomplete. The present work provides knowhow of the difficulties associated with encapsulation of PCMs with metallic shell material.

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“…These feature is generally enhanced by the mechanical activation by introducing various lattice defects. 21 Remaining PW could also contribute to the enhanced heat storage, since they are also applied to phase change thermal energy storage, 33,34 with their latent heat up to ten times higher than usual VO 2 .…”

Section: 32mentioning

confidence: 99%

Chemical and thermal properties of VO₂ mechanochemically derived from V₂O₅ by co-milling with paraffin wax

et al. 2018

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A novel mechanochemical reduction process of V 2 O 5 to VO 2 was established by milling with paraffin wax (PW, average molecular weight 254-646), serving as a reductant. The reduction progressed with increasing milling time and mass ratio V 2 O 5 : PW (MRVP). The mechanochemically derived VO 2 became phase pure after milling for 3 h with an MRVP of 30 : 1 and exhibited a reversible polymorphic transformation between tetragonal and monoclinic phases at around 53-60 C and 67-79 C during heating and cooling, respectively. The latent heat was above 20 J g À1 in both processes, being superior to those of commercial VO 2 . Doping of starting V 2 O 5 with Cr, Mo or W at 1 at% in the form of oxide did not increase the latent heat. This is another difference from the conventionally prepared doped VO 2 . These anomalous heat storage properties of mechanochemically derived VO 2 were discussed mainly on the basis of X-ray photoelectron spectroscopy V 2p3/2 peaks combined with ion etching. The observed relatively high heat storage capacity of undoped VO 2 is primarily ascribed to the abundance of V 4+ ionic states introduced during milling with PW, which were stabilized with simultaneously introduced structural degradation throughout the entire particles. The possible role of a remaining small amount of PW was also discussed.

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Experimental study on enhancement of thermal energy storage with phase-change material

Cited by 169 publications

References 40 publications

Numerical and Experimental Studies on the Heat Transfer Performance of Copper Foam Filled with Paraffin

Numerical and Experimental Studies on the Heat Transfer Performance of Copper Foam Filled with Paraffin

Microencapsulation of Paraffin Wax Microspheres with Silver

Chemical and thermal properties of VO₂ mechanochemically derived from V₂O₅ by co-milling with paraffin wax

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Experimental study on enhancement of thermal energy storage with phase-change material

Cited by 169 publications

References 40 publications

Numerical and Experimental Studies on the Heat Transfer Performance of Copper Foam Filled with Paraffin

Numerical and Experimental Studies on the Heat Transfer Performance of Copper Foam Filled with Paraffin

Microencapsulation of Paraffin Wax Microspheres with Silver

Chemical and thermal properties of VO2 mechanochemically derived from V2O5 by co-milling with paraffin wax

Contact Info

Product

Resources

About

Chemical and thermal properties of VO₂ mechanochemically derived from V₂O₅ by co-milling with paraffin wax