Evaluation of α-AL2O3-PW nanocomposites for thermal energy storage in the agro-products solar dryer

Bahari, Mohammad; Najafi, Bahman; Babapoor, Aziz

doi:10.1016/j.est.2019.101181

Cited by 39 publications

(11 citation statements)

References 38 publications

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“…The cabin interior temperature increased up to 10 wt.% Al2O3 fraction compared to pure RT55, and started to decrease again with the further increase of the Al2O3 fraction. The main reason is that the Al2O3 nanoparticles improve the heat transfer coefficient and thermal stability of pure paraffin [30]. Because the nanoparticles dispersed in PCM contribute to the improvement of the melting and solidification processes by increasing the thermal conductivity due to its high surface areato-volume ratio [31].…”

Section: Resultsmentioning

confidence: 99%

The Effect of Al_2 O_3 Addition on Solidification Process of Phase Change Material: A Case Study on Heating of Automobile Cabin in Cold Climate Conditions

Gürbüz

Aytaç

HAMAMCIOĞLU

et al. 2022

International Journal of Automotive Science and Technology

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In this paper, an experimental investigation is revealed on the solidification process of the latent heat thermal energy storage (LHTES) system, in which the heat energy emitted into the atmosphere with the exhaust gases of ICE vehicles is stored by phase change material (PCM) enhanced with nanoparticles (Al2O3). In the study using RT55 paraffin wax as the PCM, the interior heating process of a typical sedan automobile in cold climate conditions is used as the heat release medium for the LHTES system. Experimental studies carried out in real climatic conditions were repeated for pure paraffin (RT55) and five dif-ferent Al2O3 fractions (5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%, and 25 wt.%). Ex-periments are performed in an optical PCM container and are completed after 1200 seconds (20 minutes). The heat energy stored in the PCM container is discharged to the automobile cabin via the closed-circuit liquid circulation system by the heating radiator system in the automobile cabin. The findings showed that the solidification process is improved considerably up to 10 wt.% Al2O3 fractions compared with pure paraffin RT55, and the temperature in the cabin could be increased by approximately 29%. In addition, the Al2O3 frac-tion increased by more than 10 wt.%, which has a negative effect on the im-provement in the solidification process, but higher solidification ability and in-cabinet temperature were obtained with all Al2O3 fractions compared to pure RT55.

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Section: Resultsmentioning

confidence: 99%

The Effect of Al_2 O_3 Addition on Solidification Process of Phase Change Material: A Case Study on Heating of Automobile Cabin in Cold Climate Conditions

Gürbüz

Aytaç

HAMAMCIOĞLU

et al. 2022

International Journal of Automotive Science and Technology

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show abstract

“…The high cost of traditional energy resources makes it increasingly necessary to use alternative energy sources to reduce energy intensity and increase the efficiency of technical equipment in agricultural production [7][8][9][10][11][12][13][14][15][16][17][18]. Combined types of dryers with different sources of thermal energy are often used [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Heat Balance of Combined Heat Exchanger Aerodynamic Heating Dryers

Купреенко¹,

Isaev²,

Kuznetsov³

et al. 2022

adeletters

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Today, the use of aerodynamic dryers for drying various types of fruit crops is very current. In them, the electric energy spent on the drive of the centrifugal fan is transformed into thermal energy due to the mutual friction of the air flows circulating in the closed chamber. In order to increase the energy efficiency of the drying process, the heat of the waste drying agent was used in the research. The presented dryer was equipped with a combined heat exchanger. In order to predict the thermal performance of the combined heat exchanger depending on external factor variables, the dependence of the temperature of the fresh drying agent at the outlet of the combined heat exchanger on the dryer operation time is theoretically determined on the basis of the heat balance equation. The air solar collector in the combined heat exchanger made it possible to increase the temperature of the drying agent at the outlet by another 10oC without extra costs of electrical energy. A comparative analysis of the results of experimental and theoretical studies showed their high convergence.

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“…However, the moisture content in the crop needs to decrease after the drying process. The extent of bacterial degradation can be signi cantly decreased by removing the moisture content.Therefore, it is feasible to accumulate adried-outfood product for an extended period (Bahari et al 2020). The methodology of solar drying is typically intended to meet speci c drying attributes of farming products with an improved approach to energy utilisation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Solar Dryer with Thermal Energy Storage System for Drying of Agro Products

Govindan¹,

Sattanathan²,

Muthukannan³

et al. 2021

Preprint

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The drying of food products is an essential step in the preservation ofcrops and agricultural by-products that serve as raw materials for numerous end applications. Solar drying with Phase Change Material (PCM) is an efficient low-energy consumption processin the post-reapingstage, reducing food deterioration. A customized solar dryer setup was assembled usingCudappah (black) stones as the baseof the drying chamber to facilitate the absorption of solar energy on its surface. Theorganic paraffin wax, with a melting point of 60℃,was used as PCM in the solar dryer. The novelty of the study is the application of a PCMin asolar dryer to improve the effectiveness of drying and decrease the absolute drying period and the microbial content in the dried food products. The study compared the drying characteristics between open sun drying, solar dryingwithout and with PCM (100 and 200 grams). The fabricated setup was utilised for drying coconut using a PCM-based solar drying method.The coconut was dried from an initial moisture content of 55.5% to a final moisture content of about 9%. The prototype dryer modelminimized the use ofthe workforce,avoided improper drying,and decreased the absolute drying time. A Total Plate Count (TPC) test was conducted to characterize the microbial content in the dried coconut.The microbial count decreased with the use of 200 g PCM as the use of PCM retained the heat for a longer time in the chamber. The drying time of the coconut was decreased by about 28 and 52 hours by installing of about 100 and 200g of PCM respectively. The drying time of the coconut decreased with an increase in the amount of PCM in the solar dryer. The sensory characteristics like colour, taste, flavour, quality, and texture of the solar-dried coconut sample were superiorto the sun-dried coconut sample.

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Evaluation of α-AL2O3-PW nanocomposites for thermal energy storage in the agro-products solar dryer

Cited by 39 publications

References 38 publications

The Effect of Al_2 O_3 Addition on Solidification Process of Phase Change Material: A Case Study on Heating of Automobile Cabin in Cold Climate Conditions

The Effect of Al_2 O_3 Addition on Solidification Process of Phase Change Material: A Case Study on Heating of Automobile Cabin in Cold Climate Conditions

Heat Balance of Combined Heat Exchanger Aerodynamic Heating Dryers

Experimental Study of Solar Dryer with Thermal Energy Storage System for Drying of Agro Products

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