Numerical analysis of latent heat thermal energy storage using encapsulated phase change material for solar thermal power plant

Bhagat, Kunal; Saha, Sandip K.

doi:10.1016/j.renene.2016.04.018

Cited by 101 publications

(33 citation statements)

References 42 publications

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“…Over the past decade, comprehensive research work has been conducted on the packed bed latent heat thermal energy storage system (PBTES) employing spherical PCM capsules having the same diameter to examine the thermal performance by estimating the charging time and the first law efficiency . Xu et al provided an elaborate review of PCM along with thermal performance enhancement techniques suitable for TES for CSP plants.…”

Section: Introductionmentioning

confidence: 99%

Exergetic and performance analyses of two‐layered packed bed latent heat thermal energy storage system

Saha

Das

2019

Int J Energy Res

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Summary In concentrating solar power (CSP) plant, a novel method involving the use of thermocline can be employed to augment the capability of the thermal energy storage system (TES). The rate of thermocline degradation can be reduced by packing encapsulated phase change material (PCM) in the TES. The thermal performance of the packed bed latent heat thermal energy storage system (PBTES) can be further enhanced by employing different diameters of PCM capsules arranged in multiple layers. In this paper, the thermal and exergetic performance of single‐layered and two‐layered PBTES is evaluated for varying mass flow rate, PCM capsule diameter and bed height of larger PCM capsules using a dynamic model based on simplified energy balance equations for PCM and heat transfer fluid (HTF). The single‐layered PBTES has a lower TES latent charging rate than the two‐layered PBTES. The charging efficiency and charging time of two‐layered PBTES are increased by 15.85% and 16.85%, respectively for reducing the HTF mass flow rate by 14.29%. A higher stratification number can be achieved by using a two‐layered PBTES instead of a single‐layered PBTES filled with the corresponding larger diameter PCM capsules. The second law efficiency of the two‐layered PBTES is found to be less than that of the single‐layered PBTES. A decrease in the bed height of larger PCM capsules decreases the exergetic efficiency of the two‐layered PBTES by 3.27%. The findings from this study can be used in further designing and optimising the multi‐layered PBTES.

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Section: Introductionmentioning

confidence: 99%

Exergetic and performance analyses of two‐layered packed bed latent heat thermal energy storage system

Saha

Das

2019

Int J Energy Res

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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%

“…[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. [15][16][17] Saghir and Bayomy 18 investigated a ternary mixture of water with a nanofluid and a microencapsulated PCM in a porous medium. Their results indicated a limited improvement of the thermal performance.…”

Section: Introductionmentioning

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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“…A high‐temperature solar thermal energy storage unit based on the molten soda lime silica glass was examined by Cárdenas et al They demonstrated that the overall performance of the thermal energy storage unit was satisfactory and the unit was capable of supplying the required 4 kW output throughout the 16‐hour discharge while it reached its fully charged state during the subsequent 8‐hour recharge. The analysis of latent heat thermal energy storage using the encapsulated PCM for solar thermal power plant was carried out by Bhagat and Saha . They showed that the ability of the latent heat thermal energy storage system to store and release energy was significantly improved by increasing mass flow rate and inlet charging temperature.…”

Section: Introductionmentioning

confidence: 99%

A mobile thermal battery resembling a solar receiver: Innovative design and performance assessment

2018

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Summary An innovative design of a mobile thermal battery resembling the solar receiver is presented. A ternary salt mixture consisting of 52% KNO3, 18% NaNO3, and 30% LiNO3 by wt% is used as the thermal energy storing medium inside the thermal battery. Since the thermal conductivity of the ternary salt mixture is low, aluminum meshes are introduced to create a thermal conduction tree inside the thermal energy storing medium. The actual field data are used in the simulations to resemble the solar irradiation emanating from the parabolic trough and focusing onto the thermal battery outer surface. To improve the uniform heating at the outer surface, the thermal battery rotation along the centerline of the trough is considered. The temperature parameter is introduced to assess the uniform‐like temperature distribution inside the ternary salt mixture. It is found that the use of aluminum meshes improves the heat diffusion in the phase change material of the ternary salt mixture; in which case, it acts like a thermal conduction tree inside the thermal battery. The rotation of the thermal battery results in uniform‐like temperature distribution across the thermal battery cross section and suppresses the excessive temperature rise because of the local heating in the close region of the thermal battery outer surface.

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Numerical analysis of latent heat thermal energy storage using encapsulated phase change material for solar thermal power plant

Cited by 101 publications

References 42 publications

Exergetic and performance analyses of two‐layered packed bed latent heat thermal energy storage system

Exergetic and performance analyses of two‐layered packed bed latent heat thermal energy storage system

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

A mobile thermal battery resembling a solar receiver: Innovative design and performance assessment

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