Solar Drying—A Sustainable Way of Food Processing

Aravindh, M. A.; Saritha, Appukuttan

doi:10.1007/978-81-322-2337-5_2

Cited by 27 publications

(10 citation statements)

References 3 publications

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“…These dryers require high capital and running cost to build and operate the facilities and also use conventional energy sources (Aravindh and Sreekumar, 2015) and they are not often viable to use in many developing countries (Ringeisen et al, 2014). In addition to this; using artificial drying methods with energy sources from fossil fuels and biomass will result in greenhouse gas emissions that contributes for global climate change.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical quality of twin layer solar tunnel dried tomato slices

Dufera

Hofäcker

Esper³

et al. 2021

Heliyon

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The objective of this experimental study was to evaluate the effect of twin layer solar tunnel drying on physicochemical quality of tomato slices. The novelty of this dryer is that it has two layers of trays unlike Hohenheim solar tunnel dryer which makes it to have drying capacity of more than two times compare to type hohenheim solar tunnel dryer with equal collector area. The experiment consists of two (tray position and drying position) factors with two levels of tray position (upper tray (samples exposed to direct solar radiation) and lower tray (samples are exposed to only heated air)) and three levels of drying position (collector out let,middle of the dryer and dryer out let) with three replications. During the experiment 180 kg of Tomato slices of Galilea variety with 5mm thickness were dried in the twin layer solar tunnel dryer. Data on physicochemical quality of tomato were collected and analyzed using SAS (version 9.2). software. From the experimental result; an increase in lycopene and phenolic content retention along the length of the dryer was observed while Vitamin C retention showed a decreasing trend. Large retention of total phenol, lycopene and beta carotene content were observed for the lower tray dried tomato slices compared to the upper tray dried ones. The water activity and PH values of the solar tunnel dried tomatoes were within the safe range from microbial growth, enzymatic and non-enzymatic browning. Compared to sun drying; solar tunnel dried tomatoes showed a much better nutrient retention for all quality parameters which is comparable with the data reported for energy intensive mechanical dryers.

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Section: Introductionmentioning

confidence: 99%

Physicochemical quality of twin layer solar tunnel dried tomato slices

Dufera

Hofäcker

Esper³

et al. 2021

Heliyon

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show abstract

“…Research also shows that drying in general affects the nutritional value of vegetables, leading to a decrease in many phytochemicals, which are of health benefits, resulting in reduction of nutritional quality of the final products [4]. From late 19th century many drying techniques were developed to improve upon the efficiencies of the solar drying systems without having negative impact on the quality of the final dried products [5].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Three Solar Drying Methods of Adensonia digitate L. (Baobab Leaves using Drying Kinetics and Empirical Drying Models)

Okaiyeto

Unguwanrimi

2021

JERR

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A comparative study of three drying methods of baobab leaves have been conducted and reported. Mixed mode solar drying, indirect mode solar drying and open sun drying of baobab leaves were conducted based on three drying models viz a viz Lewis,. Page and Henderson and Pabis models were employed in this research. Baobab leaves dried faster when dried under the mixed mode on-farm solar dryer. Drying time reduced considerably using the mixed mode on-farm solar dryer. Drying data were fitted into Lewis, Page and Henderson and Pabis models. Henderson and Pabis model (R2=0.9999, 0.9611, 0.9656; X2= 1.0297, 0.7931, 0.7710; RMSE= 0.5859, 0.6898, 0.6802 and MBE= -0.4.135, -0.4.231, -0.4176) gave the best prediction for the mixed mode drying). In the same way Henderson and Pabis model (R2=0.7450, 0.7699, 0.8243; X2= 1.9025, 0.4026, 0.2006; RMSE= 1.0684, 0.5181, 0.4058 and MBE= -0.8966, -0.3823, 0.2789) gave the best prediction for the indirect mode drying of baobab leaves. Effective moisture diffusivity of baobab leaves varied between -6.382 X 10-04 and -1.108 X 10-03 m2/s.

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“…However, this method results in poor quality of dried vegetable products due to uncontrollable weather conditions, dust particles, and other contaminating substances. Aravindh [5] reported that products dried using solar dryers have good texture, color and nutritive content when compared with products dried using conventional open sun drying.…”

Section: Introductionmentioning

confidence: 99%

Comparative Studies of Two Developed On-farm Solar Dryers for Vegetables

Okaiyeto¹,

Unguwanrimi²,

Ogijo³

et al. 2020

JERR

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This research work was carried out to provide local farmers with on-farm solar dryers to minimize post-harvest losses of vegetables. Two dryers (Mixed mode and Indirect mode on-farm solar dryers) were constructed using locally available materials. The dryers basically consist of a blower, a collector area and a drying chamber. Aluminum sheet is placed inside the collector which serves as the absorbing material. An electrical axial fan was placed before the air duct to supply air responsible for forcing heated air to blow over the vegetables to be dried. Incorporated in the drying chamber are trays which provide a platform where the products to be dried were spread evenly. Transparent polythene material of 0.2 mm thickness with wooden frame was used as cover for the dryers. The dryers were evaluated to determine drying time and performance efficiencies, using Baobab leaves, Tomato and Okra slices as test crops. Collected data were analyzed using Statistical Analysis Software (SAS). The effects of variation of the independent factors were verified using Analysis of variance (ANOVA) at 1% and 5% levels of significant. Mean separation was carried out on significant factors using Duncan Multiple Range Test (DMRT). The results obtained showed the performance of the developed dryers, which indicates that drying time of mixed mode on-farm solar dryer stood at 56 hrs and 46 hrs while that of the indirect mode dryer was 76.67 hrs and 57 hrs and that of open sun drying was 154 hrs and 127 hrs for tomato and okra slices respectively. Results obtained showed that average system drying, energy collection and pick up efficiencies for the three test crops were 16.35%, 21.1% and 8.05% for mixed mode dryer respectively and 28.63%, 45.3% and 0.3% for indirect mode dryer, respectively. From the results obtained the mixed mode dryer dried all the products faster while indirect mode has superior energy efficiencies.

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Solar Drying—A Sustainable Way of Food Processing

Cited by 27 publications

References 3 publications

Physicochemical quality of twin layer solar tunnel dried tomato slices

Physicochemical quality of twin layer solar tunnel dried tomato slices

Comparative Study of Three Solar Drying Methods of Adensonia digitate L. (Baobab Leaves using Drying Kinetics and Empirical Drying Models)

Comparative Studies of Two Developed On-farm Solar Dryers for Vegetables

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