Enhancement of solidification rate of latent heat thermal energy storage using corrugated fins

Aly, Kareem Awny; El-Lathy, Ahmed R.; Fouad, Mahmoud

doi:10.1016/j.est.2019.100785

Cited by 93 publications

(19 citation statements)

References 25 publications

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“…In this context, equation 13is useful to estimate the lifetime (t f ) of palm oil that undergoes thermal aging, which is defined as the time period after which the material undergoes a change in its properties that it can no longer satisfy the function for which it was produced [39]. In particular, the degradation time (tα) required to reach a given conversion rate can be calculated by Equation (14), which is the integral of Equation (13).…”

Section: Reaction Model and Pre-exponential Factor Determinationmentioning

confidence: 99%

“…In this context, the use of thermal energy storage (TES) materials, being capable to store heat to be later used under varying temperature conditions in combination with passive and active techniques has lately gathered increasing attention by the scientific community [11,12,13]. As a matter of fact, this kind of materials can guarantee a favorable dynamic response to the local boundary conditions, providing huge energy densities and, eventually, a unique buffering effect on indoor thermal fluctuations.…”

Section: Introductionmentioning

confidence: 99%

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Palm oil-based bio-PCM for energy efficient building applications: Multipurpose thermal investigation and life cycle assessment

Fabiani

Pisello

Barbanera

et al. 2020

Journal of Energy Storage

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This study aims at investigating the potential use of a bio-based phase change material, i.e. expired palm oil from the food industry, as a more sustainable alternative to petrochemical-based organic PCMs. To this purpose, thermogravimetric analysis (TGA) and isoconversional methods (Starink and Miura-Maki methods) are applied and the main thermo-physical properties of the blend are investigated by means of differential scanning calorimetry (DSC) and extensive thermal monitoring in a controlled realistic environment. Finally, a life cycle assessment is used to evaluate the environmental impact of the bio-based material in comparison to the more common petrochemical-based application. Kinetic analysis results indicate the two dimensional phase boundary reaction model as the most reliable scheme for describing the oxidation of palm oil, with an activation energy of about 73 kJ•mol −1. The DSC and the thermal monitoring procedure, showed two separate melting peaks in the ambient temperature range, which globally guarantee a melting enthalpy of about 50 kJ•kg −1 , i.e. of the same order of magnitude of the first developed PCMs. Results from the life cycle analysis reveal that the expired palm oil can be considered a promising material for bio-based latent applications.

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Section: Reaction Model and Pre-exponential Factor Determinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Palm oil-based bio-PCM for energy efficient building applications: Multipurpose thermal investigation and life cycle assessment

Fabiani

Pisello

Barbanera

et al. 2020

Journal of Energy Storage

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show abstract

“…Besides the arrangement of fins, numerous researchers investigated the fins of various shapes. Aly et al [95] found that when the straight longitudinal fins were replaced by corrugated fins, the solidification time of PCM decreased by 38%. Furthermore, Scharinger-Urschitz et al [88], Zhang et Besides the arrangement of fins, numerous researchers investigated the fins of various shapes.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

“…Furthermore, Scharinger-Urschitz et al [88], Zhang et Besides the arrangement of fins, numerous researchers investigated the fins of various shapes. Aly et al [95] found that when the straight longitudinal fins were replaced by corrugated fins, the solidification time of PCM decreased by 38%. Furthermore, Scharinger-Urschitz et al [88], Zhang et al [96], and Luo and Liao [97] proposed using fractal Y-shaped (tree-shaped, dendritic) fins.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

et al. 2020

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An application of latent heat thermal energy storage systems with phase change materials seems to be unavoidable in the present world. The latent heat thermal energy storage systems allow for storing excessive heat during low demand and then releasing it during peak demand. However, a phase change material is only one of the components of a latent heat thermal energy storage system. The second part of the latent heat thermal energy storage is a heat exchanger that allows heat transfer between a heat transfer fluid and a phase change material. Thus, the main aim of this review paper is to present and systematize knowledge about the heat exchangers used in the latent heat thermal energy storage systems. Furthermore, the operating parameters influencing the phase change time of phase change materials in the heat exchangers, and the possibilities of accelerating the phase change are discussed. Based on the literature reviewed, it is found that the phase change time of phase change materials in the heat exchangers can be reduced by changing the geometrical parameters of heat exchangers or by using fins, metal foams, heat pipes, and multiple phase change materials. To decrease the phase change material’s phase change time in the tubular heat exchangers it is recommended to increase the number of tubes keeping the phase change material’s mass constant. In the case of tanks filled with spherical phase change material’s capsules, the capsules’ diameter should be reduced to shorten the phase change time. However, it is found that some changes in the constructions of heat exchangers reduce the melting time of the phase change materials, but they increase the solidification time.

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“…The addition of a conducting fin within the inner tube helped to intensify the recirculation process in the bottom half region of the space. The solidification time was reduced due to the novel corrugated configuration of fins, in comparison to the straight fin configuration even though the effectiveness of the corrugated fins was generally less than that of straight fins (Aly et al 2019).…”

Section: Introductionmentioning

confidence: 98%

Melting Behavior of Phase Change Material in a Solar Vertical Thermal Energy Storage with Variable Length Fins added on the Heat Transfer Tube Surfaces

Senthil

Patel

Rao

et al. 2020

Int. J. Renew. Energy Dev.

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This paper investigates the melting behaviour of phase change material (PCM) in a vertical thermal energy storage system with provision of thin rectangular fins of uniform and variable lengths on the heat transfer tube surfaces. The selected PCM and heat transfer fluid (HTF) are paraffin wax and water, respectively. The HTF is passed through the helically coiled copper tube of 10 mm diameter to melt the PCM. The time required to complete the melting of PCM in the system with fins is found to be five hours, whereas for the system without fins it is five hours and forty minutes, for the same conditions of constant water temperature of about 70°C and flow rate of 0.02 kg/s. HTF tube with fins is observed to be more effective with a 13.33% faster rate of melting when compared to that of the HTF tube without fins. Such a fast charging process will be helpful in storing maximum energy within a short period/duration of time shorter duration in for solar thermal and heat recovery applications during lean production times. ©2020. CBIORE-IJRED. All rights reserved

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Enhancement of solidification rate of latent heat thermal energy storage using corrugated fins

Cited by 93 publications

References 25 publications

Palm oil-based bio-PCM for energy efficient building applications: Multipurpose thermal investigation and life cycle assessment

Palm oil-based bio-PCM for energy efficient building applications: Multipurpose thermal investigation and life cycle assessment

The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

Melting Behavior of Phase Change Material in a Solar Vertical Thermal Energy Storage with Variable Length Fins added on the Heat Transfer Tube Surfaces

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