Effect of water based Al 2 O 3 nanoparticle PCM on cool storage performance

Altohamy, Ahmed A.; Rabbo, M.F. Abd; Sakr, R. Y.; Attia, Ahmed A.A.

doi:10.1016/j.applthermaleng.2015.03.066

Cited by 94 publications

(24 citation statements)

References 15 publications

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“…The related literature shows that the maximum reduction ratio for SD of the water-based PCM added graphene oxide [3], carbon nanotubes [15,17,18], and graphene [14,15] is about 12–100%. In addition, the maximum reduction ratio of SD using copper [5], aluminum oxide [10,11], titanium dioxide [12,13,14], and silicon dioxide [14] as additives is about 12–78%. The sample (S5) of the maximum reduction ratio of SD in this study was not particularly excellent compared with the literature although it was within the range of reduction ratio.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Experimental Evaluation of Phase-Change Characteristics in Carbon-Based Suspensions

2018

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In this study, micro/nanocarbon-based materials (MNCBMs) were prepared using the high-pressure combustion method (HPCM) with an isoperibol oxygen bomb calorimeter at different oxygen pressures (0.5–3.0 MPa). The prepared MNCBMs were added to water to form carbon-based suspensions (CBSs); sodium dodecyl benzene sulfonate (SDBS) and defoamer were added to the CBSs to enhance their stability. The thermal conductivity, viscosity, density, and contact angle of the CBSs were measured using appropriate instruments to determine their fundamental characteristics. The phase-change characteristics of the CBSs were measured and analyzed using a differential scanning calorimeter (DSC) to evaluate the feasibility of employing them as phase-change materials in ice-storage air-conditioning systems. The results revealed that the maximal change ratios of thermal conductivity, viscosity, density, and contact angle of the samples were −3.15%, 6.25%, 0.23%, and −57.03%, respectively, as compared with the water. The CBS of S5 (oxygen pressure of 2.0 MPa) had the lowest melting temperature and subcooling degree (SD) and the highest freezing temperature in the experiments conducted using the DSC; thus, S5 was determined to be the most suitable CBS for use as a phase-change material of cold energy storage in this study.

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Section: Resultsmentioning

confidence: 99%

Preparation and Experimental Evaluation of Phase-Change Characteristics in Carbon-Based Suspensions

2018

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“…In previous studies, the onset nucleation time (beginning freezing time) [14,23,24], total freezing time (complete charging time) [14,16,17,[19][20][21]24,26,28,29], or half crystallization time [15,27] were applied to characterize the performance of nanofluid PCMs. In previous studies, the onset nucleation time (beginning freezing time) [14,23,24], total freezing time (complete charging time) [14,16,17,[19][20][21]24,26,28,29], or half crystallization time [15,27] were applied to characterize the performance of nanofluid PCMs.…”

Section: Subcooling Degree and Half Freezing Timementioning

confidence: 99%

“…Half freezing time is defined as the time at which half of the PCM is solidified. In previous studies, the onset nucleation time (beginning freezing time) [14,23,24], total freezing time (complete charging time) [14,16,17,[19][20][21]24,26,28,29], or half crystallization time [15,27] were applied to characterize the performance of nanofluid PCMs. In the present study, HFT is measured to estimate the cold storage efficiency of the nanofluids.…”

Section: Subcooling Degree and Half Freezing Timementioning

confidence: 99%

“…Nanofluids are obtained by dispersing nanoparticles in a conventional base liquid and have been considered as a new type of PCMs. Previous results revealed that adding nanoparticles to base liquid enhances the thermal conductivity and thermal performance [8][9][10][11][12][13], reduces the SD and freezing (solidification) time [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], and possibly reduces the equipment size required for CTES systems [7].…”

Section: Introductionmentioning

confidence: 99%

“…This parameter is also known as the freezing point for water and aqueous solutions and the eutectic temperature for other mixtures or solutions. Previous studies revealed that the freezing point of water-based nanofluids is around 0°C, which is almost equal to the freezing point of water [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. However, subzero temperature condition is required in various applications, such as product preservation and transportation in food, pharmaceutical, and chemical plants.…”

Section: Introductionmentioning

confidence: 99%

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Phase change characteristics of ethylene glycol solution-based nanofluids for subzero thermal energy storage

Zhu

Yin

et al. 2016

Int. J. Energy Res.

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Summary Nanofluids, particularly water‐based nanofluids, have been extensively studied as liquid–solid phase change materials (PCMs) for thermal energy storage (TES). In this study, nanofluids with aqueous ethylene glycol (EG) solution as the base fluid are proposed as a novel PCM for cold thermal energy storage. Nanofluids were prepared by dispersing 0.1–0.4 wt% TiO2 nanoparticles into 12, 22, and 34 vol.% EG solutions. The dispersion stability of the nanofluids was evaluated by Turbiscan Lab. The liquid–solid phase change characteristics of the nanofluids were also investigated. Phase change temperature (PCT), nucleation temperature, and half freezing time (HFT) were investigated in freezing experiments. Subcooling degree and HFT reduction were then calculated. Latent heat of solidification was measured using differential scanning calorimetry. Thermal conductivity was determined using the hot disk thermal constant analyzer. Experimental results show that the nanoparticles decreased the PCT of 34 vol.% EG solution but minimally influenced the PCT of 12 and 22 vol.% EG solutions. For all nanofluids, the nanoparticles decreased the subcooling degree, HFT, and latent heat but increased the thermal conductivity of the EG solutions. The mechanism of the improvement of the phase change characteristics and decrease in latent heat by the nanoparticles was discussed. The nanoparticles simultaneously served as nucleating agent that induced crystal nucleation and as impurities that disturbed the growth of water crystals in EG solution‐based nanofluids. Copyright © 2016 John Wiley & Sons, Ltd.

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Improving the performance of air conditioning systems by using phase change materials: A review

Omara

Abuelnour

2019

Int J Energy Res

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Summary This paper reviews the application of phase change materials (PCMs) for improving the performance of air conditioning systems. The different methods of integrating PCMs into air conditioning systems are presented. Moreover, the effects of PCM geometry, flow, and heat transfer characteristics on the performance of air conditioning systems and the potential use of PCMs in increasing the energy savings and coefficient of performance of air conditioning systems are also discussed. Recent studies on the thermodynamic (energy and exergy), economic, and environmental benefits of integrating PCMs into air conditioning systems are reviewed. Several methods for the preparation and optimal selection of PCMs are proposed to improve the performance of air conditioning systems, and then the challenges relating to PCM properties, optimal thickness, and PCM containers are highlighted. The economic aspects, humidity effect, life cycle assessment, and use of solid‐solid PCMs are cited as potentially important topics for future research.

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Effect of water based Al 2 O 3 nanoparticle PCM on cool storage performance

Cited by 94 publications

References 15 publications

Preparation and Experimental Evaluation of Phase-Change Characteristics in Carbon-Based Suspensions

Preparation and Experimental Evaluation of Phase-Change Characteristics in Carbon-Based Suspensions

Phase change characteristics of ethylene glycol solution-based nanofluids for subzero thermal energy storage

Improving the performance of air conditioning systems by using phase change materials: A review

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