An experimental and numerical study on the effect of inclination angle of phase change materials thermal energy storage system

Siyabi, Idris Al; Khanna, Sourav; Mallick, Tapas K.

doi:10.1016/j.est.2019.03.010

Cited by 96 publications

(31 citation statements)

References 37 publications

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“…Therefore, at that temperature, the melting fraction is equal to 0.5. This is consistent with different PCM models proposed in the literature [47][48][49][50]. Taking into account this above discussion and the following assumptions, the energy balance of the PCM can be written:…”

Section: Phase Change Materialssupporting

confidence: 87%

“…From experiments, it is seen that the transition phase (also called mushy zone) occurs on relatively small to high-temperature intervals. In order to accurately model the thermal behavior of PCM, the experimental profile ( Figure 5 adapted from [47,48]) of the heat capacity generally determined by differential scanning calorimetry (DSC) is examined. For example, the DSC of paraffin RT35 (Rubitherm Technologies GmbH, Germany) is plotted in Figure 1 in [35,36].…”

Section: Phase Change Materialsmentioning

confidence: 99%

“…Note that the characterization of PCM is not very consistent through the literature. While some authors assumed that the melting temperature T m is the onset temperature T on during melting (beginning of the peak) [19], others assumed that T m is the peak temperature of the heat capacity profile [47,48]. As a result, at T m , the melting fraction is generally over 0.5 for a skewed PCM profile ( Figure 5) or equal to 0.5 for a symmetric profile (Gaussian distribution) [49].…”

Section: Phase Change Materialsmentioning

confidence: 99%

“…More specifically, the effect of PCM thermo-physical properties on the performance (in terms of energy storage density, specific power output, and energy storage The second attempt of validation was done for the PCM proposed model. To this end, the model was compared with experiments done by Siyabi et al [48]. The schematic of the experimental reactor is depicted in Figure 6c.…”

Section: Effect Of Pcm Thermo-physical Properties On the Thermal Enermentioning

confidence: 99%

“…Model validation against experimental data (a) average reacted fraction (b) average bed temperature (c) Schematic of the PCM reactor and experimental condition (d) PCM temperature at T 6[48].…”

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confidence: 99%

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Metal Hydride Beds-Phase Change Materials: Dual Mode Thermal Energy Storage for Medium-High Temperature Industrial Waste Heat Recovery

2019

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Heat storage systems based on two-tank thermochemical heat storage are gaining momentum for their utilization in solar power plants or industrial waste heat recovery since they can efficiently store heat for future usage. However, their performance is generally limited by reactor configuration, design, and optimization on the one hand and most importantly on the selection of appropriate thermochemical materials. Metal hydrides, although at the early stage of research and development (in heat storage applications), can offer several advantages over other thermochemical materials (salt hydrates, metal hydroxides, oxide, and carbonates) such as high energy storage density and power density. This study presents a system that combines latent heat and thermochemical heat storage based on two-tank metal hydrides. The systems consist of two metal hydrides tanks coupled and equipped with a phase change material (PCM) jacket. During the heat charging process, the high-temperature metal hydride (HTMH) desorbs hydrogen, which is stored in the low-temperature metal hydride (LTMH). In the meantime, the heat generated from hydrogen absorption in the LTMH tank is stored as latent heat in a phase change material (PCM) jacket surrounding the LTMH tank, to be reused during the heat discharging. A 2D axis-symmetric mathematical model was developed to investigate the heat and mass transfer phenomena inside the beds and the PCM jacket. The effects of the thermo-physical properties of the PCM and the PCM jacket size on the performance indicators (energy density, power output, and energy recovery efficiency) of the heat storage system are analyzed and discussed. The results showed that the PCM melting point, the latent heat of fusion, the density and the thermal conductivity had significant impacts on these performance indicators.Energies 2019, 12, 3949 2 of 27 or combined cooling heating and power (CCHP), have been the predominant waste-heat recovery methods in power plants. These multi-generation processes allow for an improvement of thermal energy efficiency of up to 80%. On the other hand, for industrial process heat, the organic Rankine cycle (ORC), thermoelectric generators, heat pumps, and heat storage have been reviewed as potential methods for waste heat recovery [2]. However, the efficacy of either heat recovery method depends on the conditions at which heat is discharged (especially the temperature). There are mainly three factors affecting the implementation of waste heat recovery: the availability, the heat amount and quality (which is the temperature range). The temperature range depends on the waste heat source which ranges from thermal power plants (diesel engines, fossil fuels-fired power plants, PEM, and solid oxide fuel cells) to industrial processes (steel, cement, etc). On the one hand, if the heat is available at a constant temperature, therefore the selection of ORC and thermoelectric generators for heat recovery can improve the overall energy efficiency by generating extra electricity to the end-users. On the oth...

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Section: Phase Change Materialssupporting

confidence: 87%

Section: Phase Change Materialsmentioning

confidence: 99%

Section: Phase Change Materialsmentioning

confidence: 99%

Section: Effect Of Pcm Thermo-physical Properties On the Thermal Enermentioning

confidence: 99%

mentioning

confidence: 99%

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Metal Hydride Beds-Phase Change Materials: Dual Mode Thermal Energy Storage for Medium-High Temperature Industrial Waste Heat Recovery

2019

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Thermal performance of phase change material–based heat sink with hybrid fin‐metal foam structure under hypergravity conditions

Ding

Shan

Nie

2021

Intl J of Energy Research

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The thermal management systems or heat sinks are an integral part of electronic devices for aerospace applications. The heat transfer characteristics of the widely used phase change material (PCM)-based heat sinks under hypergravity conditions are essential in the designation of the heat sink. The current study conducts a systematic evaluation on the thermal characteristics of PCM coupled with hybrid fin-metal foam (FMF) structure under variable hypergravity conditions. A validated two-dimensional transient melting heat transfer model of the designed system is proposed, and the influences of enclosure orientation, fin height, PCM slab thickness, and the distribution of fin and metal foam under different hypergravity conditions are investigated. Results show that with the decrease in inclination angle, the melting time and the heating wall temperature become lower, and the optimal inclination angle is 0 . As the PCM slab thickness gets larger, natural convection is enhanced, while the heating wall temperature and melting time become larger. With the rise of hypergravity value, the effect of inclination angle strengthens, while the influence of PCM slab thickness weakens. Furthermore, with the rise of the copper foam fraction in the hybrid FMF structure, the melting time and the heating wall temperature firstly decrease and increase afterward. The optimal copper foam fraction is 58.62%. This study guides the optimal design of the PCMbased heat sink in aerospace applications.

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Photovoltaic Thermal Collectors with Phase Change Material for Southeast of England

Singh

Elavarasan²,

Kumar

et al. 2020

Springer Proceedings in Energy

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Temperature elevation of solar photovoltaic (PV) in the exposure of sun should be bound to avoid the fall in efficiency. Phase changing material (PCM) is a proven technology to capture the waste heat of photovoltaic. It provides cooling to PV, increase in efficiency and storage of waste heat. In this paper, the thermal conductivity of PCM heat sink is enhanced by using fins. The dual effect of PCM and fins is explored to increase the efficiency of the photovoltaic collectors. Different types of phase change material arrangements are investigated. Twenty collectors of 200Wp original PV are compared with the photovoltaic thermal PCM collectors. It is conveyed that, at Southeast England, the collected electricity is boosted by 1.20, 1.33, 1.40, 1.43 and 1.44 kWh/day through different types of phase change material arrangements.

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An experimental and numerical study on the effect of inclination angle of phase change materials thermal energy storage system

Cited by 96 publications

References 37 publications

Metal Hydride Beds-Phase Change Materials: Dual Mode Thermal Energy Storage for Medium-High Temperature Industrial Waste Heat Recovery

Metal Hydride Beds-Phase Change Materials: Dual Mode Thermal Energy Storage for Medium-High Temperature Industrial Waste Heat Recovery

Thermal performance of phase change material–based heat sink with hybrid fin‐metal foam structure under hypergravity conditions

Photovoltaic Thermal Collectors with Phase Change Material for Southeast of England

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