Melting of Nanoprticle-Enhanced Phase Change Material inside Shell and Tube Heat Exchanger

Hosseini, M.J.; Ranjbar, A.A.; Sedighi, Kurosh; Rahimi, M.

doi:10.1155/2013/784681

Cited by 27 publications

(11 citation statements)

References 22 publications

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“…Among the various low temperature PCM available such as water, paraffin, fatty acids, sugar, alcohols, and salt hydrates [17], paraffin-based PCM has demonstrated excellent long-term cyclic thermal stability [18,19]. However, the ability to transfer thermal energy during the melting and freezing of these PCM is greatly inhibited by their low thermal conductivities [20]. As such, a wide range of approaches have been developed to increase the heat transfer performance of systems using PCM.…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of Inward Freezing and Melting of Additive-Enhanced Phase-Change Materials Within Millimeter-Scale Cylindrical Enclosures

Rahman

Shabgard

et al. 2016

Journal of Heat Transfer

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The inward melting and solidification of phase-change materials (PCM) within millimeter-scale cylindrical enclosures have been experimentally characterized in this work. The effects of cylinder size, thermal loading, and concentration of high-conductivity additives were investigated under constant temperature boundary conditions. Using a custom-built apparatus with fast response, freezing and melting have been measured for time periods as short as 15 s and 33 s, respectively. The enhancement of PCM thermal conductivity using exfoliated graphene nanoplatelets (xGnPs) has also been measured, showing a greater than 3× increase for a concentration of 6 wt.%. Reductions in the total melting and freezing times of up to 66% and 55%, respectively, have been achieved using xGnP concentrations of only 4.5 wt.%. It is shown that the phase-change dynamics of pure and enhanced PCM are well predicted using a simple conduction-only model, demonstrating the validity of approximating enhanced PCM with low additive loadings as homogenous materials with isotropic properties. While general consistency between the measurements and model is seen, the effect of additives on heat transfer rate during the initial stages of freezing and melting is lower than expected, particularly for the smaller cylinder sizes of 6 mm. These results suggest that the thermal resistance of the PCM is not the limiting factor dictating the speed of the solid–liquid interface during these initial stages.

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Section: Introductionmentioning

confidence: 99%

Experimental Characterization of Inward Freezing and Melting of Additive-Enhanced Phase-Change Materials Within Millimeter-Scale Cylindrical Enclosures

Rahman

Shabgard

et al. 2016

Journal of Heat Transfer

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“…Recently, some of the investigations were reported. [1] reported by numerical investigation that the 146% penetration, reduction of melting time of PCM by 14.6% cab be achieved by including the nano-particles up to 5% in volume in a shell tube heat exchanger during the melting. [2] Discussed the various possibilities of augmentation of performance of LHTSS and the significance of PCM heat exchanger to achieve the best result among the other four LHTSS.…”

Section: Introductionmentioning

confidence: 99%

Numerical Exploration of Influence of Phase Changing Material in Heat Transfer Augmentation in the Double Tube Heat Exchanger

Gnanavel¹,

Saravanan²,

Chandrasekaran³

2018

IJET

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“…To conquer this limitation, various heat transfer enhancement methods are investigated including employment PCM microencapsulation [22,23], using multiple array of PCMs [24,25], dispersing high thermal conductive materials [26,27] and using NePCMs [28,29]. Utilizing extended surfaces techniques has attracted a great amount of attention which includes fined tubes and multi-tubes.…”

Section: Introductionmentioning

confidence: 99%

Phase change in multi-tube heat exchangers

et al. 2016

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a b s t r a c tIn this paper, melting of a phase change material (PCM) in a multi-tube heat exchanger (MTHX) is investigated. Water, as the heat transfer fluid (HTF), flows through the inner tube/tubes and the outer one while RT35 as the PCM fills the middle. The aim of this study is to investigate the effect of number of inner tubes as a geometrical parameter during charging process. Also consequences of increasing operational parameters including the HTF mass flow rate and inlet temperature are studied. In order to understand the effects of the proposed configurations, a comparison between double pipe and simple MTHX is carried out. Results show that as the inlet temperature increases melting process accelerates and complete melting time reduces, whereas, similar mass flow rate increase doesn't reduce the melting time to such an extent. By increasing the number of inner tubes from 1 to 4 in the shell side of the MTHX, melt region enlarges and its including vortices strengthens which leads to a dominated convective heat transfer and thus a higher melting rate. This increase in number of tubes leads to 29% reduction in melting time.

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Melting of Nanoprticle-Enhanced Phase Change Material inside Shell and Tube Heat Exchanger

Cited by 27 publications

References 22 publications

Experimental Characterization of Inward Freezing and Melting of Additive-Enhanced Phase-Change Materials Within Millimeter-Scale Cylindrical Enclosures

Experimental Characterization of Inward Freezing and Melting of Additive-Enhanced Phase-Change Materials Within Millimeter-Scale Cylindrical Enclosures

Numerical Exploration of Influence of Phase Changing Material in Heat Transfer Augmentation in the Double Tube Heat Exchanger

Phase change in multi-tube heat exchangers

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