Experimental and numerical study of constrained melting of n-octadecane with CuO nanoparticle dispersions in a horizontal cylindrical capsule subjected to a constant heat flux

Dhaidan, Nabeel S.; Khodadadi, J. M.; Al-Hattab, Tahseen A.; Al-Mashat, Saad M.

doi:10.1016/j.ijheatmasstransfer.2013.08.001

Cited by 102 publications

(13 citation statements)

References 33 publications

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“…The results based on a square enclosure experimental setup and the COMSOL simulation showed that the parallelto-wall flat shape interface was existed at the lower part of the test cell which was dominated with the conduction heat transfer, while the curved shape interface was developed at the upper part of the test cell dominated with natural convection [80]. For both annular cavity and horizontal cylindrical vessel, it was found that conduction was dominant at the early stage of the melting process while natural convection was developed gradually, which can increase the melting rate in the top region at the later stage of the melting process [81,82].…”

Section: Numerical and Experimental Investigation On Thermodynamic Bementioning

confidence: 95%

“…Based on the similar test unit (i.e. cubic thermal containment unit), Sanusi et al [79] An experimental and numerical study on the melting of n-octadecane dispersed with copper oxide nanoparticles in a square enclosure, an annular cavity and a horizontal cylindrical vessel was reported by Dhaidan et al [80][81][82]. The commercial software COMSOL was used to numerically solve the governing equations.…”

Section: Numerical and Experimental Investigation On Thermodynamic Bementioning

confidence: 99%

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Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

161

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Nano-enhanced phase change materials (PCMs) have attracted increasing attention to address one of the key barriers (i.e. low thermal conductivity) to the wide adoption of PCMs in many industrial applications. This paper discusses the generic problem and key issues associated with appropriately using this new class of materials in buildings for effective thermal management and improved energy performance. An overview on major recent development and application of nano-enhanced PCMs as thermal energy storage media is provided. A case study based on a PCM ceiling ventilation system integrated with solar photovoltaic thermal (PVT) collectors is then performed to evaluate the potential benefits due to the dispersion of copper nanoparticles into the PCM base fluid of RT24. The results showed that this nano-enhanced PCM has higher melting and solidification rates than that of the pure PCM. Compared to the use of the pure PCM, 8.3% more heat was charged in and 25.1% more heat was discharged from the nano-enhanced PCM under the three winter test days. More research is needed to understand the fundamental mechanisms behind the PCM thermal conductivity enhancement through the dispersion of nanometer-sized materials and to investigate how these mechanisms drive building performance enhancement. Abstract: Nano-enhanced phase change materials (PCMs) have attracted increasing attention to address one of the key barriers (i.e. low thermal conductivity) to the wide adoption of PCMs in many industrial applications. This paper discusses the generic problem and key issues associated with appropriately using this new class of materials in buildings for effective thermal management and improved energy performance. An overview on major recent development and application of nano-enhanced PCMs as thermal energy storage media is provided. A case study based on a PCM ceiling ventilation system integrated with solar photovoltaic thermal (PVT) collectors is then performed to evaluate the potential benefits due to the dispersion of copper nanoparticles into the PCM base fluid of RT24. The results showed that this nano-enhanced PCM has higher melting and solidification rates than that of the pure PCM. Compared to the use of the pure PCM, 8.3% more heat was charged in and 25.1% more heat was discharged from the nano-enhanced PCM under the three winter test days. More research is needed to understand the fundamental mechanisms behind the PCM thermal conductivity enhancement through the dispersion of nanometer-sized materials and to investigate how these mechanisms drive building performance enhancement.

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Section: Numerical and Experimental Investigation On Thermodynamic Bementioning

confidence: 95%

Section: Numerical and Experimental Investigation On Thermodynamic Bementioning

confidence: 99%

Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

161

View full text Add to dashboard Cite

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“…As such, a wide range of approaches have been developed to increase the heat transfer performance of systems using PCM. These include most notably the addition of conductive solid structures into the PCM, such as metal matrices [18,21], graphite matrices [22], fins [23], foils and heat pipes [1], and nanoenhanced PCM [24][25][26][27]. In particular, a variety of carbon-based nanoparticles with high intrinsic thermal conductivity, including graphite nanofibers [28,29], few-layer graphene nanoplatelets [30][31][32], and ultrathin graphite foams [33,34], have been used to enhance thermal conductivity of PCM, leading to up to 28 times improvement in thermal conductivity of PCM [31].…”

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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“…One of the most efficient and reliable ways to reduce energy consumption is the use of PCMs in latent heat thermal energy storage (LHTES) system to store and release thermal energy. Several works have been done recently considering different types of PCMs and different heat exchanger geometries ( [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]). The shell and finned tubes [6] and [7] is the only one tested on a prototype scale.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Cylindrical Thermal Energy Storage System using Bio-Based Phase Change Materials

Alomair¹,

Alomair²,

Abdullah³

et al. 2017

International Conference of Energy Harvesting, Storage, and Transfer

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-Thermal energy storage (TES) using phase change materials (PCMs) are an efficient and reliable technique to reduce consumption of energy. The heat transfer processes during phase change in PCMs is complex because of the simultaneous presence of solid and liquid phases where, solid and liquid fractions are continuously changing with time. The present experimental investigation focuses on the transient behaviour of the melting process and the dynamic of the solid-liquid interface in a cylindrical TES containing bio-based PCM. Coconut oil is used as a bio-based PCM and two different experimental conditions are investigated. The aim of this study is to improve the understanding of the fundamental of solid-liquid phase transition during melting, and a better characterization of the related heat transfer during phase change processes of bio-based PCM. To achieve these goals, an experimental setup is developed for the visualization of charging time, melt fraction location, and thermal field measurements.

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Experimental and numerical study of constrained melting of n-octadecane with CuO nanoparticle dispersions in a horizontal cylindrical capsule subjected to a constant heat flux

Cited by 102 publications

References 33 publications

Nano-enhanced phase change materials for improved building performance

Nano-enhanced phase change materials for improved building performance

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

Experimental Investigation of Cylindrical Thermal Energy Storage System using Bio-Based Phase Change Materials

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