Phase Change Material (PCM) Microcapsules for Thermal Energy Storage

Peng, Guangjian; Dou, Guijing; Hu, Yahao; Sun, Yiheng; Chen, Zhitong

doi:10.1155/2020/9490873

Cited by 196 publications

(66 citation statements)

References 176 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Additional small endothermic peaks in the range of 282–289 °C can be attributed to the latent heat during the eutectic phase transformation of the ZnAl alloy core. Several characteristics of the core-shell material were calculated according to Equations (12) to (14) [ 83 , 84 , 85 ], and are summarized in Table 3 .…”

Section: Resultsmentioning

confidence: 99%

“…Additional small endothermic peaks in the range of 282-289 °C can be attributed to the latent heat during the eutectic phase transformation of the ZnAl alloy core. Several characteristics of the core-shell material were calculated according to Equations (12) to (14) [83][84][85], and are summarized in Table 3. Thermal energy capability = × 100% (14) where ΔHm,core and ΔHm,core-shell are the melting heat capacities, and ΔHc,core and ΔHc,core-shell are the solidification heat capacities of the core material and the core-shell material, respectively.…”

Section: Characterization Of the Znal/ni/nip Core-shell Powdermentioning

confidence: 99%

See 1 more Smart Citation

Electrochemical Processing and Thermal Properties of Functional Core/Multi-Shell ZnAl/Ni/NiP Microparticles

et al. 2021

View full text Add to dashboard Cite

Electroless deposition on zinc and its alloys is challenging because of the negative standard potential of zinc, the formation of poor surface layers during oxidation in aqueous solutions, and extensive hydrogen evolution. Therefore, there are only few reports of electroless deposition on Zn and its alloys, neither of them on micro/nano powders. Here, we propose a two-step process that allows the formation of compact, uniform, and conformal Ni/NiP shell on Zn-based alloy microparticles without agglomeration. The process utilizes controlled galvanic displacement of Ni deposition in ethanol-based bath, followed by NiP autocatalytic deposition in an alkaline aqueous solution. The mechanism and effect of deposition conditions on the shell formation are discussed. Thermal stability and functional analysis of core-shell powder reveal a thermal storage capability of 98.5% with an encapsulation ratio of 66.5%. No significant morphological change of the core-shell powder and no apparent leakage of the ZnAl alloy through the Ni shell are evident following differential scanning calorimetry tests. Our two-step process paves the way to utilize electroless deposition for depositing metallic-based functional coatings on Zn-based bulk and powder materials.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Characterization Of the Znal/ni/nip Core-shell Powdermentioning

confidence: 99%

Electrochemical Processing and Thermal Properties of Functional Core/Multi-Shell ZnAl/Ni/NiP Microparticles

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The active temperature-regulating ability of PCMs nowadays is widely applied in thermal management of such areas as buildings, electronics, medicine, automotive, textiles. Considering application in textiles, PCMs integrated into various fibres and fabrics provide temporary warmth or coolness effect, thereby diminishing thermal discomfort [ 1 , 2 , 3 , 4 , 5 ]. Among available PCMs, organic PCMs with a phase change temperature range of 18 °C to 35 °C are the most appropriate for textile application [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the Thermal Performance of the Paraffin-Based Microcapsules Intended for Textile Applications

et al. 2021

View full text Add to dashboard Cite

Phase changing materials (PCMs) microcapsules MPCM32D, consisting of a polymeric melamine-formaldehyde (MF) resin shell surrounding a paraffin core (melting point: 30–32 °C), have been modified by introducing thermally conductive additives on their outer shell surface. As additives, multiwall carbon nanotubes (MWCNTs) and poly (3,4-ethylenedioxyoxythiophene) poly (styrene sulphonate) (PEDOT: PSS) were used in different parts by weight (1 wt.%, 5 wt.%, and 10 wt.%). The main aim of this modification—to enhance the thermal performance of the microencapsulated PCMs intended for textile applications. The morphologic analysis of the newly formed coating of MWCNTs or PEDOT: PSS microcapsules shell was observed by SEM. The heat storage and release capacity were evaluated by changing microcapsules MPCM32D shell modification. In order to evaluate the influence of the modified MF outer shell on the thermal properties of paraffin PCM, a thermal conductivity coefficient (λ) of these unmodified and shell-modified microcapsules was also measured by the comparative method. Based on the identified optimal parameters of the thermal performance of the tested PCM microcapsules, a 3D warp-knitted spacer fabric from PET was treated with a composition containing 5 wt.% MWCNTs or 5 wt.% PEDOT: PSS shell-modified microcapsules MPCM32D and acrylic resin binder. To assess the dynamic thermal behaviour of the treated fabric samples, an IR heating source and IR camera were used. The fabric with 5 wt.% MWCNTs or 5 wt.% PEDOT: PSS in shell-modified paraffin microcapsules MPCM32D revealed much faster heating and significantly slower cooling compared to the fabric treated with the unmodified ones. The thermal conductivity of the investigated fabric samples with modified microcapsules MPCM32D has been improved in comparison to the fabric samples with unmodified ones. That confirms the positive influence of using thermally conductive enhancing additives for the heat transfer rate within the textile sample containing these modified paraffin PCM microcapsules.

show abstract

“…The latent heat of absorption and release of the PCM can be used to reduce the maximum temperature and increase heat transfer in a loop. PCM particles can be prepared by microencapsulation technology [1][2][3][4][5] or emulsion technology [6][7][8]. In microencapsulation, polymer materials cover the PCM to create a barrier between the dispersed phase (PCM) and the dispersion medium (such as water and glycerol) that results in the suspension of PCM particles in the dispersion medium.…”

Section: Introductionmentioning

confidence: 99%

Conjugate Heat Transfer Analysis of PCM Suspensions in a Circular Tube under External Cooling Convection: Wall Conduction Effects

Wang

Chen

et al. 2020

Applied Sciences

View full text Add to dashboard Cite

In this paper, a numerical method is used to investigate the conjugate heat transfer of a phase change material (PCM) suspension in a circular tube under external cooling convection. The following parameters and ranges were considered: dimensionless tube wall thickness, t w (0–0.5); wall-to-fluid thermal conductivity ratio, k w f * (0.1–10); volumetric fraction of PCM particles, c v (0.1); Biot number, B i o (1); Stefan number, Ste (0.1); and Peclet number, Pe (1000). The results show that the wall thermal conductivity considerably affects the outer/inner wall temperature of the tube, the average temperature of the working fluid, and the volumetric liquid fraction of PCM particles. Thus, wall conduction effects must be properly accounted for to model heat transfer in a PCM suspension in tube flow.

show abstract

Phase Change Material (PCM) Microcapsules for Thermal Energy Storage

Cited by 196 publications

References 176 publications

Electrochemical Processing and Thermal Properties of Functional Core/Multi-Shell ZnAl/Ni/NiP Microparticles

Electrochemical Processing and Thermal Properties of Functional Core/Multi-Shell ZnAl/Ni/NiP Microparticles

Enhancement of the Thermal Performance of the Paraffin-Based Microcapsules Intended for Textile Applications

Conjugate Heat Transfer Analysis of PCM Suspensions in a Circular Tube under External Cooling Convection: Wall Conduction Effects

Contact Info

Product

Resources

About