Recent advances in solar drying technologies: A Comprehensive review

Behera, Debashree Debadatta; Mohanty, A.M.; Mohanty, Ramesh Chandra

doi:10.30521/jes.1050814

Cited by 3 publications

(2 citation statements)

References 69 publications

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“…According to a first investigation into the test results, similarly, the test results are relatively stable in the ST of 8.0 mm, and the TS has a small effect on the SD's result accuracy. In the range Eissa et al, 2024 of 4 -6 mm, the test results vary greatly, and the ST has a greater impact on the SD's result accuracy at all levels of AV.…”

Section: 4effect Of Thicknesses Of Ts On the Reduction On The Total W...mentioning

confidence: 99%

Some Engineering Factors Affecting Utilization of Solar Energy in Drying Tomato Fruits

Elwakeel,

Mostafa,

Gameh

et al. 2024

Aswan University Journal of Environmental Studies

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Tomato fruit (TF) is considered one of the most cultivated and consumed vegetables around the world, and it is characterized by a high content of vitamins and mineral elements. But it is unfortunate that it is seasonal and contains a high percentage of moisture, which hinders the storage process. This leads researchers around the world to innovate and develop processes that will preserve TF in a safe way for safe use throughout the year and facilitate the preservation and processing. Therefore, the current study focused on studying the different engineering factors through which the use of solar energy (SE) in drying TF can be maximized. The TF were dried using a solar dryer (SD) attached to a fixed solar collector (FSC) and another SD attached to a solar collector integrated with an automatic sun tracking system (ASCT). The field experiments were done at three drying air velocities of 1, 1.5, and 2 m/s and three slice thicknesses (ST) of 4, 6, and 8 mm. The results showed that the ASCT reaches a peak air temperature of 65°C, while the FSC reaches a peak air temperature of 55°C. This 10°C difference in air temperature can have a significant impact on drying times, which led to an increase in the thermal efficiency of the SC equipped with an ASCT by about 17% compared to the traditional FSC. The maximum efficiency of the PV system was about 17% at 8.0 a.m. In addition, the ASCT samples dry more quickly than the FSC samples at all AV. On SD merged with ASCT, the TF samples dried for 5-8 hours reached EMC; whereas, on SD merged with FSC, the TF samples dried for 6-10 hours reached EMC. This indicates that the time needed to dry TF slices was reduced by 20% to 25% when the developed ASCT was used.

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Section: 4effect Of Thicknesses Of Ts On the Reduction On The Total W...mentioning

confidence: 99%

Some Engineering Factors Affecting Utilization of Solar Energy in Drying Tomato Fruits

Elwakeel,

Mostafa,

Gameh

et al. 2024

Aswan University Journal of Environmental Studies

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“…Solar dryers are generally classified according to different modes of heat transfer, the form of solar heat utilization, and temperature range. The solar dryer is categorized as a passive, active, or hybrid solar dryer by Behera et al (2022). Jha and Tripathy (2021) have studied different types of hybrid solar dryers according to climatic conditions.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of a hybrid solar dryer through experimental and CFD investigation

Behera

Mohanty

2023

J Food Process Engineering

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Solar drying comes under clean energy technology that aims to dry food products hygienically. The present work discusses the development of an energy‐efficient and cost‐effective hybrid‐type solar dryer for drying 15 kg of food products. Experiments and CFD modeling of the solar drying system have been carried out for drying tomato slices. The maximum efficiency of the collector has been obtained as 74.1% and 66.96%, respectively with and without using exhaust hot air recirculation. Performance indicators such as convective heat transfer coefficient, overall loss coefficient, drying efficiency, and collector efficiency factor have been obtained as 7.743685 W/m2°C, 5.94189 W/m2°C, 32.89%, and 0.987%, respectively. The coefficient of determination (R2) is calculated as 0.9863, 0.9919, and 0.9755 for the first, second, and third day, respectively, representing a higher order of fit of getting a performance evaluation of the collector. A p‐value is obtained as 0.49375 (>0.05) from a paired sample t‐test signifying no statistical significance difference between the predicted and actual experimental results of collector efficiency. For a constant mass flow rate of air, the maximum temperature inside the drying chamber and wall radiative heat flux obtained from experiments and CFD simulation are in good agreement, thus satisfying the validation. Further, the dryer can be used during the night time by using an electric coil producing a satisfactory drying effect. It is lightweight and easily portable to capture maximum solar radiation. Practical applications The present solar dryer is most suitable for drying applications in food processing industries due to the clean and hygienic process of drying. It is easily portable to any location to capture maximum solar radiation. It is lightweight and has low construction, and maintenance costs. It is the most efficient and fast drying compared to open sun drying and can be used for large‐scale drying in industrial applications. The present study is about CFD simulations of the solar dryers for drying 5 kg of tomato slices. The drying efficiency has been increased by utilizing exhaust hot air circulation. Both the simulation and experimental results have been validated and further dryer has been used during night time by using an auxiliary heating element.

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Effect of Solar Collector Geometry on Drying Time and Nutritional Properties of Levant Quality Hazelnuts

Akgün,

Aygün,

Akgün

et al. 2024

Black Sea Journal of Engineering and Science

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This study examines the impact of drying Levant hazelnut samples, including husk and shell, using hot air heated by solar panels at a constant speed of 6 m/s. The study also investigates the impact of collector irradiation absorption surface geometries on hazelnut drying time. A solar collector with four types of air duct geometry was used to dry hazelnuts. The radiation-absorbing surface of the air duct was manufactured flat, and three different trapezoidal geometries (30, 45 and 60 angles) were used. The mass losses of hazelnuts were measured and determined at regular intervals. In addition, the total phenolic content, the DPPH radical scavenging activity, the FRAP, the free fatty acid content, the peroxide value and the moisture content were measured. For the purpose of comparison, some of the products have been dried by means of unheated air at ambient temperature. The pre-drying process (withering process) to separate the hazelnuts from husk, only took 1.5 days (14 hours excluding night). In these systems, the shelled fresh hazelnuts, separated from the husk, fell below the equilibrium moisture content of 6% in 2 days (except for 18 hours at night). It was found that the most suitable collector geometry for all the parameters studied in the drying of hazelnuts with solar collectors was 45 degrees, and that other geometries could be used in terms of food properties.

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Recent advances in solar drying technologies: A Comprehensive review

Cited by 3 publications

References 69 publications

Some Engineering Factors Affecting Utilization of Solar Energy in Drying Tomato Fruits

Some Engineering Factors Affecting Utilization of Solar Energy in Drying Tomato Fruits

Thermal performance of a hybrid solar dryer through experimental and CFD investigation

Effect of Solar Collector Geometry on Drying Time and Nutritional Properties of Levant Quality Hazelnuts

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