Thermal energy storage performance of a three-PCM cascade tank in a high-temperature packed bed system

Mao, Qianjun; Zhang, Yamei

doi:10.1016/j.renene.2020.01.051

Cited by 141 publications

(15 citation statements)

References 39 publications

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“…Solid-liquid phase transformation, such as air-conditioning cooling technology, waste heat utilization technology, solar energy utilization technology, building energy-saving equipment, etc. In various engineering fields, phase-change materials are especially widely used in the field of solar energy [1][2][3][4][5]. The extensive application of phase change heat transfer in various engineering fields is inseparable from the scholars' continuous research on phase change materials.…”

Section: Introductionmentioning

confidence: 99%

Division of paraffin melting zone based on multiscale experiments

Liu

TianYu

et al. 2022

THERM SCI

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Phase change energy storage materials are widely used in the field of renewable energy. Paraffin is one of the common phase change energy storage materials. As a multi-component hydrocarbon mixture, the melting of paraffin is different from that of pure substance. In addition to the solid and liquid zones, there is also a fuzzy zone in which solid and liquid coexist. In this paper, the melting characteristics of paraffin in phase transition zone are studied by multi-scale experiments. Through the visualization experiment of square cavity paraffin melting, the solid zone, fuzzy zone and liquid zone are determined, and the moving process of phase interface is tracked by digital pictures and infrared heat maps. The evolution process of the pore structure in the fuzzy zone under different temperatures is photographed by means of the micro experiment, and it is revealed that there are two areas in the fuzzy zone, porous media area and multiphase flow area. The results show that the melting process of paraffin can be divided into four zones: liquid zone, multiphase flow zone, porous media zone and solid phase zone. According to the polarizing optical microscopy (POM) picture, the continuous phase and discrete phase transition relationship between solid wax crystal and liquid paraffin is captured. The POM picture is statistically analyzed, and the critical liquid phase ratio of the transition from porous media area to multiphase flow area is given under experimental conditions.

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Section: Introductionmentioning

confidence: 99%

Division of paraffin melting zone based on multiscale experiments

Liu

TianYu

et al. 2022

THERM SCI

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“…Paraffin phase change process has wide and important applications in many fields, such as building energy saving, energy utilization, space exploration, pipeline paraffin removal and other fields [1][2][3][4][5]. Because of the wide melting temperature range and high latent heat of paraffin, the research on paraffin melting at domestic and foreign mainly focuses on the field of phase change materials, including the preparation methods of PCMs [6] and the improvement of solid-liquid phase-change heat transfer [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of paraffin melting in circular tube using lattice Boltzmann method

Liu

Zhang

et al. 2022

THERM SCI

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Paraffin melting is widely used in the fields of phase change materials (PCMs) energy storage, gathering and transportation pipeline paraffin removal, etc. Analysis of the phase change mechanism and influencing factors of paraffin melting in the circular tube deeply has important guiding significance for improving the heat storage capacity by changing the structure of phase change material storage device and ensuring the safe transportation of crude oil in the pipeline. A double distribution lattice Boltzmann model based on enthalpy method is established to simulate the temperature field and the flow field of paraffin melting in a circular tube in this paper. The influence of different Rayleigh (Ra) number and Prandtl (Pr) number on the paraffin melting process in a circular tube is analyzed. The results show that the natural convection process is strengthened with the increase of the Ra number, and the decrease of the average Nusselt (Nu) number on the wall is smooth in the transition stage of wax melting due to the existence of fuzzy zone. The melting rate of paraffin can be accelerated or reduced by controlling the number Pr, so as to meet the relevant requirements of engineering.

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“…Further, experimentation carried out with the adoption of three different PCM's in a TES tank revealed that the use of cascaded PCM contributed to augmentation in the fraction of phase change and capacity of energy storage, compared to a single PCM unit with a higher melting point 32 . Recently, an enthalpy‐based analysis with concentric‐dispersion model for analyzing PCM's phase transition effect in a high temperature packed bed system revealed that the TES capacity and rate of utilization with the adoption of cascaded three PCM tank was relatively high compared to a single PCM tank 33 . Further, microencapsulation is also identified as an effective technique for improving the thermal conductivity and storage capacity of PCM's 34 .…”

Section: Introductionmentioning

confidence: 99%

Comparative investigation on heat transfer enhancement of surface‐roughened and nano‐dispersed phase change material for thermal energy storage

Santosh

Kumaresan

Paranthaman³

et al. 2021

Int J Energy Res

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Summary Considering the increasing energy demand and cost, phase change materials (PCM) are gaining momentum for efficient thermal energy storage (TES). However, beyond desirable properties, poor thermal stability is a major drawback of the PCM. To address the same, the present study aims to comparatively evaluate the thermal behavior of the plain encapsulated paraffin PCM, PCM with surface‐roughened (shot‐peened) encapsulation, and PCM with Al2O3 nanoparticles respectively. The charging and discharging characteristics were assessed experimentally with the investigation on PCM's behavior considering lower (0.0124 kg/s) and higher (0.0155 kg/s) air heat transfer fluid (HTF) mass flow rates. Results indicated that shot‐peened capsule contributed to the maximum heat transfer rate due to efficient nucleating convective effect followed by nano‐dispersed and plain capsules respectively. The duration for complete melting of PCM in the shot‐peened capsule was 11.53% and 20.6% lesser compared to the other two cases. Similarly, the period of complete solidification was 20.23% and 10.38% lesser in shot‐peened capsule compared to nano‐dispersed and plain capsules. Further, the effect of HTF's flow rate was minimal (up to 5.95%) during both charging and discharging periods. Thus, comparatively shot peening on the capsule's inner surface was found to efficiently contribute to heat transfer augmentation of the paraffin wax PCM outperforming other cases.

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Thermal energy storage performance of a three-PCM cascade tank in a high-temperature packed bed system

Cited by 141 publications

References 39 publications

Division of paraffin melting zone based on multiscale experiments

Division of paraffin melting zone based on multiscale experiments

Numerical simulation of paraffin melting in circular tube using lattice Boltzmann method

Comparative investigation on heat transfer enhancement of surface‐roughened and nano‐dispersed phase change material for thermal energy storage

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