Numerical Investigations on Latent Heat Storage Unit using Phase Change Material

Amer, Ahmed E.; Лебедев, В. А.

doi:10.1088/1742-6596/1565/1/012099

Cited by 5 publications

(5 citation statements)

References 10 publications

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“…The numerical predictions of this model and experimental data 40 are in good agreement. The validated numerical model 40 is identical to the current numerical model given in Section 2.2 but without the fin. However, there is some discrepancy between numerical results and the corresponding experimental data in the period between 1 and 2 hours, due to the complexity of the buoyancy‐induced natural convection that occurs in this period.…”

Section: Materials and Methods Of Researchsupporting

confidence: 69%

“…The melting of the selected paraffin wax (as the PCM) in the specific S‐T storage unit without fins was experimentally studied 39 . In our recent numerical investigation, 40 the numerical predictions were compared with the experimental results of the reference case, 39 as illustrated in Figure 1. The numerical predictions of this model and experimental data 40 are in good agreement.…”

Section: Materials and Methods Of Researchmentioning

confidence: 99%

“…In our recent numerical investigation, 40 the numerical predictions were compared with the experimental results of the reference case, 39 as illustrated in Figure 1. The numerical predictions of this model and experimental data 40 are in good agreement. The validated numerical model 40 is identical to the current numerical model given in Section 2.2 but without the fin.…”

Section: Materials and Methods Of Researchmentioning

confidence: 99%

“…The experimental data 39 and corresponding numerical predictions of the current numerical model without fins 40 for the temperature at the top section (TA)…”

Section: Materials and Methods Of Researchmentioning

confidence: 99%

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Thermal performance of an accumulator unit using phase change material with a fixed volume of fins

2021

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Summary Melting rate enhancement inside an accumulator unit for a phase change material (PCM) has been numerically investigated in a shell‐and‐tube (S‐T) arrangement that incorporates the circular type of fins, considering a fixed total volume of fins. The number of fins was chosen as the design parameter. The heat transfer fluid (HTF) was chosen as water that flows through the selected accumulator unit during the process of melting. The computational fluid dynamics (CFD) technique has been utilized for the simulation of the accumulator using ANSYS FLUENT software by considering a two‐dimensional axisymmetric cylindrical accumulator in a vertical direction. During the melting process, two heat transfer mechanisms were considered, namely, conduction and convection. The HTF flow was 5 L/min with a flow temperature of 358 K for charging. The predicted complete melting time of the PCM decreased by 53.125%, 65.625%, 71.875%, and 71.875% for fins numbering 6, 18, 30, and 36, respectively, compared with the S‐T without fins where it took approximately 480 minutes to melt completely. The optimal fin parameters are recommended in this study as follows: number of fins N = 30, thickness t/d = 0.01858, interval d/L = 0.03227, and aspect ratio t/h = 0.015. These recommended values maximize the thermal performance of the selected accumulator unit. The effects of changing the flow rate of the heat transfer fluid and its inlet temperature have been found to be significant on the PCM melting rate. The total melting time of the PCM is found to be reduced by about 57% when the inlet flow temperature is increased from 343 to 358 K. Moreover, the total melting time reduces by about 70.5% with an increase in the heat transfer fluid mass flow rate from 0.15 to 5 L/min. Furthermore, increasing the HTF flow rate from 0.15 to 5 L/min leads to a reduction of about 61.1% in the predicted total time that is required for solidification. The temperature differences for low flow rates are greater than those for high flow rates. The novelty of this study is in investigating the performance at a fixed total volume of fins.

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Section: Materials and Methods Of Researchsupporting

confidence: 69%

Section: Materials and Methods Of Researchmentioning

confidence: 99%

Section: Materials and Methods Of Researchmentioning

confidence: 99%

“…The experimental data 39 and corresponding numerical predictions of the current numerical model without fins 40 for the temperature at the top section (TA)…”

Section: Materials and Methods Of Researchmentioning

confidence: 99%

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Thermal performance of an accumulator unit using phase change material with a fixed volume of fins

2021

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“…Оттирка и обесшламливание руды. Собиратели, как правило, чувствительны к наличию шламов в руде [2,3,9]. Глинистые минералы ультратонкого размера могут покрывать частицы руды и препятствовать прикреплению пузырьков к ценным минеральным частицам, что приводит к снижению эффективности флотации [26,28].…”

Section: влияние увеличения расхода собирателя на процесс флотации нефелинаunclassified

Increasing the efficiency of phosphate ore processing using flotation method

Aleksandrova

Elbendari

2021

PMI

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The paper presents flotation of two phosphate ore samples of different origin. Statistical analysis was used to study the effect of operating parameters on flotation efficiency. The paper proposes to increase the efficiency of flotation processing of magmatic phosphate ore with a low grade of the valuable component (P2O5 = 10.88 %), containing nepheline and feldspars, by means of direct anionic flotation. Authors present an optimization of anionic flotation using tall oil fatty acids mixed with anionic phospholane as an anionic collector. The effect of adding soda ash to compensate for the influence of calcium cations on technological parameters of P2O5 flotation was examined. The results of studying the flotation of nepheline ore (flotation tailings of magmatic phosphate ore) showed that replacement of phospholane with oxyethylated isotridecanol allowed to obtain a high-quality concentrate. It was estimated that with the addition of Na2CO3 in the amount of 2,000 g/t, a concentrate was obtained with the grade and recovery of phosphorus pentoxide equal to 39.15 and 94.19 %, respectively. The paper proposes to increase the efficiency of flotation processing of sedimentary phosphate ore with a low grade of the valuable component (P2O5 = 22.5 %), containing gypsum and quartz, by means of desliming followed by anionic or cationic reverse flotation. Tall oil fatty acid with anionic phospholane was used as a collector in anionic reverse flotation, and amine was used in cationic reverse flotation. Sodium tripolyphosphate was used as a P2O5 depressant. It was found to be an effective depressant in both anionic and cationic flotation. When analyzing the statistical plan, it was estimated that the maximum grade of the valuable component in the concentrate (P2O5 = 31.23 %) and the recovery to concentrate of 95.22 % were obtained in the chamber product at amine consumption of 950.88 g/t and sodium tripolyphosphate consumption of 500 g/t.

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Performance Analysis of a Green Hydrogen Production System in Several Coastal Locations in Egypt

Elsakka,

Refaat,

Ahmed

et al. 2024

Earth and Environmental Sciences Library

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Numerical Investigations on Latent Heat Storage Unit using Phase Change Material

Cited by 5 publications

References 10 publications

Thermal performance of an accumulator unit using phase change material with a fixed volume of fins

Thermal performance of an accumulator unit using phase change material with a fixed volume of fins

Increasing the efficiency of phosphate ore processing using flotation method

Performance Analysis of a Green Hydrogen Production System in Several Coastal Locations in Egypt

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