Effect of drying using solar energy and phase change material on kiwifruit properties

Reyes, Antonio; Vásquez, José; Pailahueque, N.; Mahn, Andrea

doi:10.1080/07373937.2018.1450268

Cited by 45 publications

(12 citation statements)

References 35 publications

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“…These results were positively correlated with the R 2 data of the selected model, because the Midilli model also showed the highest absolute values (R 2 > 0.997). Reyes et al (2019) also found adequate fit of the Midilli model for the solar drying of kiwi slices with thicknesses of 4 and 8 mm. Kesavan et al (2019) found good fit of the Midilli model to the experimental data of solar drying of potato slices, with R 2 greater than 0.999 and low values of MSD and 2 χ (0.0057 and 0.540 ×10 -4 , respectively).…”

Section: Mathematical Modeling Of the Drying Processmentioning

confidence: 68%

“…In other words, the resistance to moisture movement is lower in thinner samples (Hussein et al, 2016). Reyes et al (2019) dehydrated kiwi with thicknesses of 4 and 8 mm in solar dryer and found the shortest drying time for the smallest thickness. The average initial moisture content of Brazil nut residue was 123.34% d.b., which was reduced to 4.91, 3.60 and 2.15% d.b.…”

Section: Equilibrium Moisture Contentmentioning

confidence: 94%

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Solar drying of residue from Brazil nut processing

Nascimento

Oliveira

Santos

et al. 2021

Braz. J. Food Technol.

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Brazil nuts are often used for direct consumption or in the preparation process of water-soluble extract. After obtaining the water-soluble extract, a large amount of Brazil nut residues with good sensory characteristics are generated. Thus, this study aimed to dry Brazil nut processing residues in layers with different thicknesses in a direct solar dryer as well as by direct exposure to the sun, in order to fit different mathematical models to the experimental data of drying kinetics, and calculate the drying rates and effective diffusivity. The drying procedures began at 9 a.m. on a concrete base, for samples dried by direct exposure to the sun, and in a solar dryer constructed with expanded polystyrene foam zinc plated and a glass cover. The mass loss of the samples was monitored by weighing at regular times until the hygroscopic equilibrium was obtained. The direct solar dryer had temperatures about 80% higher than those recorded in the open environmental air temperature. Drying rates were higher in dehydrations performed in the solar dryer compared to the drying by exposure to the sun. The Midilli model was selected as the most adequate for predicting the drying of the samples under all experimental conditions, showing coefficients of determination above 0.99. The effective diffusion coefficients of moisture were higher in samples dehydrated in the solar dryer when compared to those dried by exposure to the sun. Regarding the research conducted under the experimental conditions of this study, the performance of the solar dryer to dry Brazil nut processing residues was satisfactory.

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Section: Mathematical Modeling Of the Drying Processmentioning

confidence: 68%

Section: Equilibrium Moisture Contentmentioning

confidence: 94%

Solar drying of residue from Brazil nut processing

Nascimento

Oliveira

Santos

et al. 2021

Braz. J. Food Technol.

View full text Add to dashboard Cite

show abstract

“…Based on this, a new model was formulated by Vargas-Lopez et al [98]. Reyes et al [99] showed that by using a fuzzy logic control system the period of energy retention of the PCM could be extended. In principle, the same should be true for the discharge from a PCM.…”

Section: Methods Of Integration Of Pcms and Numerical Analysismentioning

confidence: 99%

Potential for Mitigation of Solar Collector Overheating Through Application of Phase Change Materials – A Review

Ranilović¹,

Grozdek²

2020

J. sustain. dev. energy water environ. syst.

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Demand for domestic hot water and heating is rarely perfectly concurrent with solar irradiation, which means that collectors can overheat in periods of high incident radiation and low demand. Phase change materials have been used as energy storage in space heating applications to absorbs excess heat during low demand periods for use in peak demand periods. This paper reviews the current state of research on the possibility of application of such materials as energy storage for solar collectors, in order to avoid collector overheating. Finally, various materials were evaluated and ranked for this application based on required properties and price. An example model of such materials being applied in a typical family house domestic hot water solar system is also provided.

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“…Thermal storage implies that a part of the solar energy is stored during day time and is released to the system during nighttime (Aboul-Enein et al, 2000;Bal et al, 2010;Arun et al, 2020). The solar energy can be stored in the form of sensible heat (Ayyappan et al, 2016) or latent heat (Jain and Tewari, 2015;Ayyappan et al, 2016;Reyes et al, 2019;Salih et al, 2019;Babar et al, 2020). Another strategy is to decrease the humidity level of the incoming air by employing passive dehumidification.…”

Section: Introductionmentioning

confidence: 99%

Physics-Based Digital Twin Identifies Trade-Offs Between Drying Time, Fruit Quality, and Energy Use for Solar Drying

Prawiranto

Carmeliet²,

Defraeye

2021

Front. Sustain. Food Syst.

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Solar drying is regarded as a less reliable process compared to continuous hot-air drying due to the intermittency of solar radiation. This problem is mitigated by equipping solar dryers with thermal storage, dehumidifier units, or auxiliary heating that enhances drying continuity during night time. In this study, we combine a mechanistic fruit drying model, quality models (vitamin C decay and browning reaction) and weather data to evaluate the drying characteristics and quality evolution of apple fruit with and without the aforementioned improvement strategies. By coupling to measured weather conditions, a digital twin of the drying fruit is established. The twin outputs drying times and final product quality for a specific fruit type and size, a particular dryer configuration, and specific weather conditions. The trade-offs between drying time, final product quality and energy use for the different improvement strategies of solar drying are documented. We found that solar drying may benefit from the slower drying due to the improvement of product quality. Compared to the other improvement strategies, dehumidification of the drying air is shown to be superior in retaining the vitamin C content and prohibiting the browning reaction. However, in general, drying with auxiliary heating is found to balance the trade-offs between drying time, final product quality and energy use since the weather-dependency of the process is mitigated. Additionally, we quantified the impact of a pre-treatment process that modifies the permeability of the fruit tissue by breaking the cell membrane. We found that inducing such lysis is more effective in decreasing the drying time when drying is conducted at low (room) temperature. This study shows that using the developed digital twin, future drying process and control strategies could be optimized in real-time for every single drying run.

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Effect of drying using solar energy and phase change material on kiwifruit properties

Cited by 45 publications

References 35 publications

Solar drying of residue from Brazil nut processing

Solar drying of residue from Brazil nut processing

Potential for Mitigation of Solar Collector Overheating Through Application of Phase Change Materials – A Review

Physics-Based Digital Twin Identifies Trade-Offs Between Drying Time, Fruit Quality, and Energy Use for Solar Drying

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