Experimental Investigation of Drying Cucumber in a Double Slope Solar Dryer Under Natural Convection and Open Sun Drying

Elavarasan, E.; Natarajan, Sendhil Kumar; Bhanu, Anagh S.; Anandu, A.; Senin, M. H.

doi:10.1007/978-981-16-4489-4_5

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…The average solar radiation and ambient temperature were recorded as 794.18 W/m 2 and 34.33°C, with the maximum solar radiation and atmospheric temperature being 1002.03 W/m 2 and 36.75°C at 11 a.m., respectively. A similar trend was observed by Gatea, 44 Elavarasan et al, 45,46 Elavarasan and sendhil 47 …”

Section: Resultssupporting

confidence: 81%

“…Dried samples increase the self-life, easy to storage and transport facilities, and this will decrease the cost and waste of the samples. [40][41][42][43] From, Figure 3 44 Elavarasan et al, 45,46 Elavarasan and sendhil. 47 From Table 2, it is observed that the Ash content is highest for forced convection drying (6.21 g/100 gm), followed by natural con-…”

Section: Resultsmentioning

confidence: 97%

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Physicochemical characteristics of dried ivy gourd in a single slope solar dryer

Elangovan

Natarajan²

2022

Env Prog and Sustain Energy

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Ivy gourd with a good amount of potassium (K) and calcium (Ca) offers greater benefit to human health. Studying the drying mechanism of fresh ivy gourd is very important for subsequent processes and the quality of the product. The present study is intended to perform a mineral analysis (K and Ca), ash content and color parameter (L*, a*, b*, C*, H*, and whiteness and yellowness index) of solar‐dried ivy gourd. Drying experiments are performed in a single slope solar dryer and open sun drying. During the drying process, the temperature of the dryer is maintained from 45 to 75°C, undergoing forced convection drying (air velocity of 1 m/s). Fresh and dried ivy gourd samples had high amounts of Ca (379.26–4992.24 mg/kg) and K (330.63–14690.24 mg/kg). The highest mineral values were determined in the ivy gourd samples dried inside a forced convection solar dryer. Open sun (L*43.29, a*−0.57, b*16.78, C*16.78, h*88.05), natural convection (L*41.74, a*−1.74, b*15.82, C*15.98, h*83.54) and forced convection (L*41.72, a*−2.02, b*15.81, C*15.94, h*82.72) revealed better color values in the dried ivy gourd samples. The moisture is reduced from 93.5% to 10% wet basis in the natural and forced convection solar dryer within 9 and 6 h, whereas it took 10 h under open sun drying. Forced convection solar dryer dried the ivy gourd sample in a minimal time with better mineral retention and color parameter values when compared to natural and open sun‐dried samples.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 97%

Physicochemical characteristics of dried ivy gourd in a single slope solar dryer

Elangovan

Natarajan²

2022

Env Prog and Sustain Energy

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“…Te moisture content of ginger decreased from 83.3% to 10.41%, respectively, all on wet basis as shown Figure 7. Te similar equilibrium moisture content results were reported by several research work on potatoes [34], tomatoes [35], bananas [36], and cucumbers [37]. Te net beneft, beneft-to-cost ratio, and payback duration were calculated using economic analysis and it proved the devices' economic viability.…”

Section: Economic Analysis Of the Developed Systemsupporting

confidence: 81%

Performance of Polymer Composite Constituted Cabinet Dryer Integrated within a Solar Flat Plate Collector

Raj

Kuzmin

Krishnakumar³

et al. 2023

Advances in Materials Science and Engineering

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Generally, solar dryer cabinets are made up of sheet metals that are heavy, costly, tend to rust over time, and possess the high heat rate to the outer atmosphere. In order to overcome these drawbacks, this research urges to develop a natural fiber reinforced polymer-based cabinet dryer, specially designed and fabricated for the purpose of solar drying. Nylon is used as the matrix material and Prosopis juliflora in particulate form is used as the natural fiber reinforcement. The dryer cabinet was designed at industrial scale to dry 5 kg of ginger at a single setting. This work also studies the efficiency of the polymer composite cabinet integrated with a flat plate solar collector system that is coated with copper and black chrome attached to corrugated fins in between the absorber plate and storage medium. The FRP chamber was compartmented in its interior with aluminium perforated sheets and experimentation was performed to determine the efficiency of the composite cabinet based on reduction of heat loss from the system. The performance of the coating, storage medium materials, and overall storage efficiency were also studied. The FRP cabinet resulted in a moisture level less than 8.5% within 4–7 days. Exergy studies showed 75% efficiency and energy studies gave 25.5 kJ/kg peak readings of drying efficiency for a period ranging between 11 and 12 hours. This was a 75% increment in energy efficiency. Thermal degradation of the FRP material was found to be stable up to 300°C. The overall weight of the constructed polymer cabinet was 25% lesser than the conventional systems.

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“…The moisture diffusivity (D eff ) of direct solar drying (8.43 × 10 −9 to 2.61 × 10 −8 m 2 s −1 ) was higher than the open sun drying (3.86 × 10 −11 to 1.10 × 10 −10 m 2 s −1 ). Cucumbers were dried using a direct-type solar dryer created by Elavarasan et al 13 It was shown that solar drying reduced the MC of dried cucumber from 93 to 12% in 7 h, whereas open sun drying required 11 h. In addition, it was discovered that the dried cucumber's effective D eff and energy efficiency ranged from 8.1 × 10 −5 to 1.1 × 10 −3 m 2 s −1 and 19 to 78.8%, respectively. The findings align with Elavarasan et al 14 on the direct-type solar drying of tomatoes.…”

Section: Direct and Indirect Solar Dryingmentioning

confidence: 99%

A review of solar and solar‐assisted drying of fresh produce: state of the art, drying kinetics, and product qualities

Boateng

2023

J Sci Food Agric

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Global demand exists for high‐quality fresh produce. Nevertheless, the quality of fresh produce is severely impacted by its perishability due to its high moisture content. Therefore, fresh produces are preserved using artificial dryers (hot‐air dryers, catalytic infrared dryers, etc.) driven by electricity or natural fuels. Nonetheless, the exorbitant cost of power has heightened the need for sustainable resources, notably solar energy, for drying. Hence, this article is a review of how solar dryers and solar‐assisted dryers have affected the drying kinetics and quality of fresh produce in the last 5 years. The review showed that solar drying modeling technology (thin‐layer modeling, computational fluid dynamics, adaptive‐network‐based fuzzy interference system, artificial neural network) helps examine fresh produce drying characteristics using various simulation tools before developing any procedure. Solar‐assisted drying shortens drying times and increases drying rates. Besides, the quality of the dried fresh produce (color, aroma, appearance, rehydration, etc.) should always be considered. Hybrid solar drying produces higher drying rates and product quality than other solar dryers. However, energy analysis needs to be done as several studies have recognized energy efficiency and product quality. In addition, fresh produce must be pre‐treated before solar drying to maintain the final product quality. Therefore, future studies should focus on creating other pretreatment techniques to produce the needed chemical and physical changes and enhance mass and heat transfer. Finally, the influence of solar drying on the final products' nutrient retention or loss, functionalities, or sensory characteristics needs further investigation and comparison to other non‐solar drying technologies. © 2023 Society of Chemical Industry.

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Experimental Investigation of Drying Cucumber in a Double Slope Solar Dryer Under Natural Convection and Open Sun Drying

Cited by 11 publications

References 14 publications

Physicochemical characteristics of dried ivy gourd in a single slope solar dryer

Physicochemical characteristics of dried ivy gourd in a single slope solar dryer

Performance of Polymer Composite Constituted Cabinet Dryer Integrated within a Solar Flat Plate Collector

A review of solar and solar‐assisted drying of fresh produce: state of the art, drying kinetics, and product qualities

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