Discharging process expedition of NEPCM in fin-assisted Latent Heat Thermal Energy Storage System

Lohrasbi, Sina; Sheikholeslami, M.; Ganji, D.D.

doi:10.1016/j.molliq.2016.06.044

Cited by 77 publications

(14 citation statements)

References 38 publications

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“…It was reported that as compared to pure paraffin, the charging rates for Al2O3, AlN and GNP based nano-PCMs were significantly enhanced by 28.01%, 36.47% and 44.57%, and the discharging rates by 14.63%, 34.95% and 41.46%, respectively. However, it was reported in [31][32][33][34] that as compared to thermal conductive additives enhanced LHS systems, the phase transition rates and thermal storage capacities of LHS systems with optimised extended surfaces were relatively higher.…”

Section: Introductionmentioning

confidence: 97%

Thermodynamic performance of a novel shell-and-tube heat exchanger incorporating paraffin as thermal storage solution for domestic and commercial applications

Khan

2019

Applied Thermal Engineering

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This article is focused to evaluate thermal performance of commercial grade paraffin in a novel shell-and-tube heat exchanger with multi-tube passes and longitudinal fins as latent heat storage (LHS) system. Thermal performance assessments of latent heat storage system are conducted with respects to charging/discharging power, accumulative thermal energy storage/retrieval, thermal efficiencies and effectiveness, heat transfer characterisation and nature of melt front propagation. The average charging and discharging powers are significantly enhanced by 75.53% and 27.04% with an increase in temperature gradient between paraffin and inlet water from 52 o C-62 o C and 15 o C-5 o C, respectively. Likewise, the maximum charging and discharging powers are augmented from 2.15 kW-2.63 kW and 5.18-10.37 kW with an increase in flow rate from 1.5-3 l/min, respectively. Furthermore, the average effectiveness, Nu-Ra and heat transfer coefficient are significantly improved with an increase in temperature gradient and moderately reduced with upgrading volume flow rate. The range of Rayleigh numbers for charging cycles have indicated turbulent nature of melt front movement and supportive behaviour of longitudinal fins orientations towards natural convection. Empirical correlations for average effectiveness and Nu-Ra are developed from experimental results to facilitate design estimation for employment of proposed LHS systems in domestic and commercial applications. These empirical correlations, to evaluate feasibility and employability of LHS systems in practical applications such as domestic hot water supply and space heating to maintain control room temperature, have been successfully implemented in real operating conditions.

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Section: Introductionmentioning

confidence: 97%

Thermodynamic performance of a novel shell-and-tube heat exchanger incorporating paraffin as thermal storage solution for domestic and commercial applications

Khan

2019

Applied Thermal Engineering

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“…[9][10][11][12] Methods for LHS performance enhancement include extending heat transfer surface, [13][14][15][16][17][18][19] improving process uniformity 7,20 and enhancing PCM conductivity. [9][10][11][12] Methods for LHS performance enhancement include extending heat transfer surface, [13][14][15][16][17][18][19] improving process uniformity 7,20 and enhancing PCM conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…In order to improve the performance of latent heat storage systems, researchers have conducted a large number of studies. [9][10][11][12] Methods for LHS performance enhancement include extending heat transfer surface, [13][14][15][16][17][18][19] improving process uniformity 7,20 and enhancing PCM conductivity. [21][22][23][24][25][26][27][28][29] Lohrasbi et al 13 and Kabbara et al 14 used axially fins and radially fins, respectively, to extend the heat transfer surface area.…”

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confidence: 99%

Conduction paths of backbones for thermal enhancement of nanocomposite phase change materials

Zhou

Zhao

et al. 2019

Int J Energy Res

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Thermal energy storage (TES) based on phase change materials (PCMs) has become a research hot spot due to its high energy storage density and maintained operating temperature during the phase change. However, as PCM has a poor thermal conductivity that can be as low as 0.2~0.5 W/m·K, the charging/discharging processes of PCM modules are significantly restrained, which severely affects the application of the TES technology in industrial sectors. This study concerns the improvement of the effective thermal conductivity of composite PCM formed by adding nanoparticles with high thermal conductivity into different PCMs. A theoretical model is established to reveal the intrinsic mechanism for the promotion of thermal conductivity of composite PCM consisting of nanoparticles. The results show that aggregation and interfacial thermal resistance are the main reasons for the change of the thermal conductivity. By forming effective conduction paths composed of backbones in the composite PCM, the average thermal conductivity can be improved significantly, which can be as high as 10~50 W/m·K with a wide range of volume fraction of the additives.

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“…The other reason of employing FEM in this study is its simplicity of analyzing mathematically and because it has optimality properties for certain types of equations [35] . Based on these reasons, FEM and its combination with other methods have been employed in several studies [36][37][38][39][40][41][42][43] .…”

Section: Introductionmentioning

confidence: 99%

Response surface method optimization of innovative fin structure for expediting discharging process in latent heat thermal energy storage system containing nano-enhanced phase change material

Sheikholeslami

Lohrasbi

Ganji

2016

Journal of the Taiwan Institute of Chemical Engineers

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Discharging process expedition of NEPCM in fin-assisted Latent Heat Thermal Energy Storage System

Cited by 77 publications

References 38 publications

Thermodynamic performance of a novel shell-and-tube heat exchanger incorporating paraffin as thermal storage solution for domestic and commercial applications

Thermodynamic performance of a novel shell-and-tube heat exchanger incorporating paraffin as thermal storage solution for domestic and commercial applications

Conduction paths of backbones for thermal enhancement of nanocomposite phase change materials

Response surface method optimization of innovative fin structure for expediting discharging process in latent heat thermal energy storage system containing nano-enhanced phase change material

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