Heat transfer enhancement in medium temperature thermal energy storage system using a multitube heat transfer array

Agyenim, Francis; Eames, Philip C.; Smyth, Mervyn

doi:10.1016/j.renene.2009.03.010

Cited by 297 publications

(104 citation statements)

References 31 publications

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“…0.4 up to 0.7 W/(m·K) [13][14][15][16][17][18][19], makes it difficult to utilize this capacity effectively. To enhance the heat transfer into PCMs, various techniques have been suggested, like fins [17,[20][21][22], metal and graphite-compound matrices [23][24][25], dispersed high-conductivity particles inside the PCM [26,27], and micro-encapsulation [28,29].…”

mentioning

confidence: 99%

Influence of the Fin Design on the Melting and Solidification Process of NaNO3 in a Thermal Energy Storage System

Walter¹,

Beck²,

Hameter³

2015

JEPE

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Abstract:The melting and solidification process of sodium nitrate, which is used as energy storage material, is studied in a vertical arranged energy storage device with two different bimetal finned tube designs (with and without additional lateral fins) for enhancing the heat transfer. The finned tube design consists of a plain steel tube while the material for the longitudinal (axial) fins is aluminum. The investigation analyses the influence of the lateral fins on the charging and discharging process. Three-dimensional transient numerical simulations are performed using the ANSYS Fluent 14.5 software. The results show that, every obstruction given by lateral fins reduces the melting and solidification velocity in direction to the outer shell.

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mentioning

confidence: 99%

Influence of the Fin Design on the Melting and Solidification Process of NaNO3 in a Thermal Energy Storage System

Walter¹,

Beck²,

Hameter³

2015

JEPE

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“…For the density of the sodium nitrate in the solid phase, the value of 2119.6 kg/m 3 was used according to [3,37,39], while for the liquid region the equation ρ liq " 1890´0.6pT´593.15q (8) which is based on the data of [40], was developed. A comparison with available data in the literature shows that the polynomial used for the liquid density of NaNO 3 in this work is located between the data of [41,42].…”

Section: Thermo-physical Propertiesmentioning

confidence: 99%

“…A widely used method to overcome this heat transport limitation in LHTES is to increase the specific surface of the heat exchanger tubes. Various techniques, like fins [4][5][6][7][8][9][10][11], dispersed high-conductivity particles inside the PCM [12,13], metal and graphite-compound matrices [14][15][16], micro-encapsulation [17][18][19] as well as a combination of metal foam made of copper and sandwich structure fins [20] have been suggested and were analyzed.…”

Section: Introductionmentioning

confidence: 99%

Transient Numerical Simulation of the Melting and Solidification Behavior of NaNO3 Using a Wire Matrix for Enhancing the Heat Transfer

2016

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Abstract:The paper presents the results of a transient numerical investigation of the melting and solidification process of sodium nitrate (NaNO 3 ), which is used as phase change material. For enhancing the heat transfer to the sodium nitrate an aluminum wire matrix is used. The numerical simulation of the melting and solidification process was done with the enthalpy-porosity approach. The numerical analysis of the melting process has shown that apart from the first period of the charging process, where heat conduction is the main heat transfer mechanism, natural convection is the dominant heat transfer mechanism. The numerical investigation of the solidification process has shown that the dominant heat transfer mechanism is heat conduction. Based on the numerical results, the discharging process has been slower than the charging process. The performance of the charged and discharged power has shown that the wire matrix is an alternative method to enhance the heat transfer into the phase change material.

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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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Heat transfer enhancement in medium temperature thermal energy storage system using a multitube heat transfer array

Cited by 297 publications

References 31 publications

Influence of the Fin Design on the Melting and Solidification Process of NaNO3 in a Thermal Energy Storage System

Influence of the Fin Design on the Melting and Solidification Process of NaNO3 in a Thermal Energy Storage System

Transient Numerical Simulation of the Melting and Solidification Behavior of NaNO3 Using a Wire Matrix for Enhancing the Heat Transfer

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

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