A review of natural energy storage materials used in solar dryers for food drying applications

Mugi, Vishnuvardhan Reddy; Das, Pritam; Balijepalli, Ramakrishna; Chandramohan, V.P.

doi:10.1016/j.est.2022.104198

Cited by 37 publications

(9 citation statements)

References 72 publications

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“…The thermal efficiency of the dryer was calculated using eq 8 and found to be 45% with TES materials and 38% without TES materials and 25% for OSD. The results are consistent with that of Mugi, Das, Balijepalli, and Chandramohan, 16 who reported that the thermal efficiency for the majority of solar dryers combined with TES materials ranged from 9.9 to 58.2%. The collector's efficiency with TES materials was calculated using eq 9 and found to be 43%.…”

Section: Performance Evaluation Of the Developed Dryersupporting

confidence: 91%

“…Passive solar dryers integrated with thermal energy storage (TES) materials can reduce the intermittent drying of agricultural products, improve the drying efficiency, and reduce the drying time . TES materials store thermal energy during the day when there is enough solar energy and discharge it when sunlight is unavailable, ensuring continuous drying of agricultural products . Most of the previous studies have primarily focused on the application of phase change materials (PCM) for agricultural drying applications .…”

Section: Introductionmentioning

confidence: 99%

“…15 TES materials store thermal energy during the day when there is enough solar energy and discharge it when sunlight is unavailable, ensuring continuous drying of agricultural products. 16 Most of the previous studies have primarily focused on the application of phase change materials (PCM) for agricultural drying applications. 17 The key issue with using PCM is that the temperature range of the process during charging and discharging must be tightly constrained.…”

Section: Introductionmentioning

confidence: 99%

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Development and Performance Evaluation of a Novel Solar Dryer Integrated with Thermal Energy Storage System for Drying of Agricultural Products

Rulazi,

Marwa,

Kichonge

et al. 2023

ACS Omega

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Passive solar dryers play a crucial role in reducing postharvest losses in fruits and vegetables, especially in regions like sub-Saharan Africa with low electrification rates and limited financial resources. However, the intermittent nature of solar energy presents a significant challenge for these dryers. Passive solar dryers integrated with thermal energy storage (TES) can reduce intermittence and improve the drying efficiency. Currently, phase change materials (PCMs) are popular heat storage materials in dryers, and paraffin wax dominates. The main problem with the use of PCMs is that it is necessary to closely constrain the temperature range of the process during charging and discharging. This can be a difficult condition to meet in simple solar dryers due to the variable availability of solar radiation. Instead, solid-phase materials, such as sand and rocks, are often used. Soapstone is one of the natural rocks with good thermal properties, but it has yet to be used as a TES material in solar dryers for drying agricultural products. Therefore, the main objective of the present study was to develop a novel solar dryer integrated with soapstone as a TES material and evaluate its performance. The proximate analysis to examine the quality of dried products using the developed technology was also carried out. The comparative experiments for the developed dryer were conducted in two modes: dryer with TES materials and without TES materials, and the results were compared with open sun drying (OSD) by drying 50 kg of fresh pineapple and carrot at different times. The drying times for pineapples in the dryer with TES, without TES, and OSD were 13, 24, and 52 h, respectively. However, the drying times for carrots in the dryer with TES, without TES, and OSD were 12, 23, and 50 h, respectively. Notably, the dryer integrated with TES materials could supply heat for around 3–4 h after sunset. The thermal efficiency of the dryer, collector efficiency, and storage efficiency of TES materials were calculated and found to be 45, 43, and 74.5%, respectively. Proximate analysis indicated that the dryer integrated with TES materials effectively maintained the quality of the dried products compared to OSD. Solar dryer integrated with soapstone showed great promise as sustainable and efficient solutions for reducing postharvest losses and enhancing food security in resource-constrained regions like sub-Saharan Africa.

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Section: Performance Evaluation Of the Developed Dryersupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development and Performance Evaluation of a Novel Solar Dryer Integrated with Thermal Energy Storage System for Drying of Agricultural Products

Rulazi,

Marwa,

Kichonge

et al. 2023

ACS Omega

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“…Solar-assisted drying has developed to improve the traditional sun-drying method. As solar energy is renewable, free energy, the development of this technology has gained recognition among researchers in attempting to overcome major problems commonly posed by sun-drying whilst increasing efficiency in the drying process of plants and herbs (Mugi et al, 2022). Solar drying mechanisms can be classified into three types: natural sunlight drying, indirect solar drying, and a hybrid of both solar drying mechanisms (Janjai and Bala, 2012).…”

Section: Introductionmentioning

confidence: 99%

Basil Quality as Affected by Drying System, Drying Temperature and Plant Layer Thickness

EL-All¹,

Khater²,

Bhansawi³

2022

Misr Journal of Agricultural Engineering

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The main aim of this study is to study the effect of different drying systems drying temperature and plant layer thickness of the quality of dried basil. To achieve that studied the effect of drying systems (hybrid solar and oven drying) and different thickness layer (1, 2 and 3cm) on the weight loss, moisture content, drying rate and essential oil content. The accumulated weight loss of basil leaves ranged from 79.07 to 83.54 % for all treatment under study. The moisture content of basil leaves ranged from 377.83 to 507.10 % d.b. for all treatment under study. The highest value of the drying rate of basil leaves (382.22 g water kg -1 h -1 ) was obtained when the basil dried by oven drying system at 50 °C with 1 cm plant layer thickness. The highest value of the basil oil content (1.8%) was obtained when the basil dried by Hybrid-drying system at 50 °C.

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“…Turkey has an average yearly total sunlight length of 2640 hours (a daily total of 7.2 hours) and an average total irradiation of 1311 kWh/m 2 -year (a daily total of 3.6 kWh/m 2 ) [10]. In this case, it increases the use of solar energy in many different applications, including drying applications [11][12][13][14]. Sun drying is the most prevalent way of preserving agricultural goods in most nations, including Turkey.…”

mentioning

confidence: 99%

Drying of mushroom slices in a new type solar drying system and under open sun: Experimental and mathematical investigation

Çerçi

Saydam

Hürdoğan

2022

European Mechanical Science

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Drying is among the beneficial food preservation strategies and this method ensures food products last before they reach consumers. The most used drying method is direct drying under the sun. However, in this method, the negative effects of the external environment damage food products. Recently, solar drying systems have been the main subject of much research as they have been protecting food from the negative effects of the external environment. In this study, a solar drying system (SD), which have a drying chamber with different structure, was used for drying mushroom. At the same time, mushroom slices were dried under open sun (OSD) for observing the performance of drying system. Drying rate (DR) and moisture ratio (MR) values were determined from the experiments. In addition, the MR values obtained from the experiments were estimated by 6 different mathematical models and 6 different machine learning algorithms. According to the results of the experiments, the drying time of the mushroom slices using SD was approximately 12.4 hours less than the drying time under open sun. The best convergence in the results gathered from the mathematical models is Sripinyowanich and Noomhorn and Hii et al. models for SD and OSD, respectively. The best estimation for MR values was realized by the Multilayer Perception algorithm for both drying methods.

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A review of natural energy storage materials used in solar dryers for food drying applications

Cited by 37 publications

References 72 publications

Development and Performance Evaluation of a Novel Solar Dryer Integrated with Thermal Energy Storage System for Drying of Agricultural Products

Development and Performance Evaluation of a Novel Solar Dryer Integrated with Thermal Energy Storage System for Drying of Agricultural Products

Basil Quality as Affected by Drying System, Drying Temperature and Plant Layer Thickness

Drying of mushroom slices in a new type solar drying system and under open sun: Experimental and mathematical investigation

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