Drying Kinetics in Solar Drying

Guiné, Raquel; Barroca, Maria João

doi:10.1007/978-981-10-3833-4_10

Cited by 4 publications

(3 citation statements)

References 119 publications

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“…)is device dries agricultural items using solar radiation. It is a strategy for reducing postharvest losses and poor quality associated with traditional solar drying [6][7][8][9][10]. Following numerous (attempts) tests, a successful design of solar dryer with natural convection was established, which can be used in active-and passive-type solar dryer applications.…”

Section: Literature Reviewmentioning

confidence: 99%

Design and Fabrication of Solar Dryer System for Food Preservation of Vegetables or Fruit

Kumar

Singh

et al. 2022

Journal of Food Quality

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Food preservation has been practised in many parts of the world for thousands of years, and it applies to a wide range of foods, including fruits, vegetables, cereals, and meat. Food preservation techniques are canning, freezing, pickling, curing (smoking or salting), and drying. Food spoilage caused by moisture is caused by the growth of mould, yeast, bacteria, and enzymes in the food. The drying process removes enough moisture from food to significantly reduce the humidity level’s likelihood of these adverse outcomes. The material's content measures how much moisture is present in that substance. The moisture content of fresh food can range from 20 to 90 percent depending on the type of food consumed. There will be no signs of moisture in food that has been thoroughly dried before being chopped. We used the experimental analysis in this study to create a mathematical model that could be used to determine which parameter was most important in the design of a solar dryer. In the future, the model is expected to be a helpful design tool for estimating the short- and long-term performance of a solar dryer under load and overload scenarios. The simulation of a solar dryer system has been performed under conditions such as the gap between the glass and the absorber plate, and the impact of hole size. The optimal hole size and spacing between the glass and the absorber plate are determined.

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Section: Literature Reviewmentioning

confidence: 99%

Design and Fabrication of Solar Dryer System for Food Preservation of Vegetables or Fruit

Kumar

Singh

et al. 2022

Journal of Food Quality

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“…Polypropylene has a higher barrier to water vapor than polyethylene bag (Shin & Selke, 2014). Foods having water activity values between 0.5 and 0.8 are more affected by nonenzymatic browning and values under 0.2 results in lipid oxidation (Guiné & Barroca, 2017). Water activity value of tomato powder packed in polypropylene bottle was within the safe range up to 6 months of storage.…”

Section: Discussionmentioning

confidence: 99%

Effect of packaging materials on lycopene vitamin C and water activity of dried tomato (Lycopersicon esculentum Mill.) powder during storage

Dufera

Hofäcker

Esper³

et al. 2023

Food Science & Nutrition

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In this work, a storage study was conducted to find suitable packaging material for tomato powder storage. Experiments were laid out in a single factor completely randomized design (CRD) to study the effect of packaging materials on lycopene, vitamin C moisture content, and water activity of tomato powder; The factor (packaging materials) has three levels (low‐density polyethylene bag, polypropylene bottle, wrapped with aluminum foils, and packed in low‐density polyethylene bag) and is replicated three times. During the study, a twin layer solar tunnel dried tomato slices of var. Galilea was used. The dried tomato slices were then ground and packed (40 g each) in the packaging materials and stored at room temperature. Samples were drawn from the packages at 2‐month interval for quality analysis and SAS (version 9.2) software was used for statistical analysis. From the result, higher retention of lycopene (80.13%) and vitamin C (49.32%) and a nonsignificant increase in moisture content and water activity were observed for tomato powder packed in polypropylene bottles after 6 months of storage. For low‐density polyethylene packed samples and samples wrapped with aluminum foil and packed in a low‐density polyethylene bag, 57.06% and 60.45% lycopene retention and 42.9% and 49.23% Vitamin C retention were observed, respectively, after 6 months of storage. Considering the results found, it can be concluded that lycopene and vitamin C content of twin layer solar tunnel dried tomato powder can be preserved at ambient temperature storage by packing in a polypropylene bottle with a safe range of moisture content and water activity levels for 6 months.

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“…Direct dryers consist of a drying chamber covered by a transparent cover made of glass or plastic and have holes to enable air circulation. In this type of dryer, moisture is removed by the direct incidence of solar radiation on the product, regardless of whether or not there is natural ventilation (Guiné & Barroca, 2017). In indirect dryers, atmospheric air is heated in solar collectors and flows in the drying chamber where the products are stored.…”

Section: Introductionmentioning

confidence: 99%

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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Drying Kinetics in Solar Drying

Cited by 4 publications

References 119 publications

Design and Fabrication of Solar Dryer System for Food Preservation of Vegetables or Fruit

Design and Fabrication of Solar Dryer System for Food Preservation of Vegetables or Fruit

Effect of packaging materials on lycopene vitamin C and water activity of dried tomato (Lycopersicon esculentum Mill.) powder during storage

Solar drying of residue from Brazil nut processing

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