Heat transfer enhancement in latent heat thermal energy storage using copper foams with varying porosity

Lei, Jie; YiShui, Tian; Zhou, Dan; Ye, Wenlin; Huang, Yanshi; Zhang, Ying

doi:10.1016/j.solener.2021.04.013

Cited by 55 publications

(9 citation statements)

References 32 publications

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“…In a series pattern, the heat transfer is limited by the biggest thermal resistance (lowest thermal conductivity), however, in a parallel pattern, even if there is a considerable thermal conductivity resistance, the heat could be conducted into the sink through the other resistances. As a result, comparison between Equations (30) and (31) reveals that the overall thermal resistance in series mode is larger than the parallel one, leading to restriction of the heat transfer rate and consequently, delays the melting process of PCM.…”

Section: Resultsmentioning

confidence: 99%

“…29 They proved that by designing the foam porosity in gradient form, uniform melting pattern and temperature distribution could be obtained for foam-PCM heat sink or TES unit. In another two-dimensional modeling of the TES unit, 30 the foam porosity pattern applied linear variation in horizontal and vertical directions. The optimum porosity pattern resulted in an enhancement of average heat flux by 3.54% and reduction of melting time by 4.26% compared to foam-PCM with a uniform porosity of 94%.…”

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confidence: 99%

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Performance evaluation of concentrated photovoltaics with phase change materials embedded metal foam‐based heat sink using gradient strategy

Rahmanian‐Koushkaki

Rahmanian

Moein‐Jahromi

et al. 2022

Intl J of Energy Research

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A novel passive cooling heat sink for thermal regulation of concentrated photovoltaics (CPV) and its performance improvement based on phase change material (PCM) embedded in the metal foam has been introduced in this study. Eighteen different patterns have been considered for the heat sink to investigate the influence of series/parallel porosity gradient arrangement, foam material gradient, inclination angle, and pore density. A computational fluid dynamics simulation has been developed to analyze the transient heat charging mechanism and evaluate the effects of porosity/material gradient with different arrangements on the conduction/convection heat transfer processes in the foam-PCM-CPV. The results revealed that parallel positive porosity gradient in y-direction could enhance the natural convection and the conduction heat transfer compared to the series negative porosity gradient in the xdirection and reduce the time-average CPV temperature by 6.76 C and enhance the time-average electrical efficiency by 3.93%. The results also indicated that using an obtuse inclination angle instead of anacute one may reduce the CPV temperature by about 5 C and leads to an electrical efficiency improvement of 2.65%. The lower value of pore density is another determinative factor that could enhance the total absorbed heat by about 12% for different patterns.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Performance evaluation of concentrated photovoltaics with phase change materials embedded metal foam‐based heat sink using gradient strategy

Rahmanian‐Koushkaki

Rahmanian

Moein‐Jahromi

et al. 2022

Intl J of Energy Research

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“…They are often based on either play/design with the tune geometry of the device or system for TES usage [12] or to increase the thermal conductivity of the PCM-based composite. The latter can be achieved by using additions and/or high-conducting particles such as carbon microfibers [13,14], fine materials such as copper [15], graphite [16], aluminum [17], bronze [18], nickel and stainless steel [19], graphene nano-platelets [20], and carbon nanotubes [21].…”

Section: Introductionmentioning

confidence: 99%

Multiobjective Optimization of Cement-Based Panels Enhanced with Microencapsulated Phase Change Materials for Building Energy Applications

2022

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Thermal energy storage using phase change materials (PCMs) is a promising technology for improving the thermal performance of buildings and reducing their energy consumption. However, the effectiveness of passive PCMs in buildings depends on their optimal design regarding the building typology and typical climate conditions. Within this context, the present contribution introduces a novel multiobjective computational method to optimize the thermophysical properties of cementitious building panels enhanced with a microencapsulated PCM (MPCM). To achieve this, a parametric model for PCM-based cementitious composites is developed in EnergyPlus, considering as design variables the melting temperature of PCMs and the thickness and thermal conductivity of the panel. A multiobjective genetic algorithm is dynamically coupled with the building energy model to find the best trade-off between annual heating and cooling loads. The optimization results obtained for a case study building in Sofia (Bulgaria-EU) reveal that the annual heating and cooling loads have contradictory performances regarding the thermophysical properties studied. A thick MPCM-enhanced panel with a melting temperature of 22 °C is needed to reduce the heating loads, while a thin panel with a melting temperature of 27 °C is required to mitigate the cooling loads. Using these designs, the annual heating and cooling loads decrease by 23% and 3%, respectively. Moreover, up to 12.4% cooling load reduction is reached if the thermal conductivity of the panels is increased. Therefore, it is also concluded that the thermal conductivity of the cement-based panels can significantly influence the effectiveness of MPCMs in buildings.

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“…In fact, the thermal conductivity of most inorganic PCMs are less than 1.0 W (m À1 K À1 ), whilst organic PCMs have even lesser thermal conductivity values of 0.2 W (m À1 K À1 ). 11,31 Such low thermal conductivity of PCMs could lead to low heat transfer rate, resulting in slow heat exchange performance during melting and solidication processes. Furthermore, in a LHTES system, the major cost is associated with the heat transfer technology that employs to achieve a large amount of heat charge/discharge rates to achieve high efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] LHTES is the most promising method in this eld due to the excellent phase change behavior [5][6][7] and high heat storage capacity. 8,9 Up to now, phase change materials (PCMs) for the LHTES have been widely investigated in building energy storage, such as building insulation walls, 10 phase change cement boards, 11 solar space cooling and heating applications in buildings. 12 Among all types of PCMs organic PCMs have desirable characteristics including a suitable melting temperature, negligible supercooling through phase change, outstanding phase transition performance, and non-toxicity.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of a thermal energy storage system using shape-stabilized LDPE/hexadecane/SEBS composite PCMs by copper oxide addition

2022

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Heat transfer enhancement in latent heat thermal energy storage using copper foams with varying porosity

Cited by 55 publications

References 32 publications

Performance evaluation of concentrated photovoltaics with phase change materials embedded metal foam‐based heat sink using gradient strategy

Performance evaluation of concentrated photovoltaics with phase change materials embedded metal foam‐based heat sink using gradient strategy

Multiobjective Optimization of Cement-Based Panels Enhanced with Microencapsulated Phase Change Materials for Building Energy Applications

Performance enhancement of a thermal energy storage system using shape-stabilized LDPE/hexadecane/SEBS composite PCMs by copper oxide addition

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