Recent developments in solar drying technology of food and agricultural products: A review

EL-Mesery, Hany S.; EL‐Seesy, Ahmed I.; Hu, Zicheng; Li, Yang

doi:10.1016/j.rser.2021.112070

Cited by 72 publications

(29 citation statements)

References 189 publications

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“…Heat pump dryers are continuously being developed all around the world, and their effectiveness has been shown to outperform conventional drying processes. [15][16][17][18][19][20] Heat pump dryers are characterized by their energy efficiency of up to 91.95%, low power consumption which ranges between 60% and 80%, low cost, good drying efficiency of up to 95%, high coefficient of performance of up to 5, low drying temperature of up to 80%, short drying time, low relative humidity which varies from 10% to 80% and thus the ability of nutrient retention of the dried products. [21][22][23][24][25][26][27] The ability to control the temperature of the drying air and humidity while recovering energy from exhaust are the primary advantages of heat pump dryers.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive assessment of heat pump dryers for drying agricultural products

Loemba

Kichonge

Kivevele

2022

Energy Science & Engineering

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Fruits and vegetables are agricultural products that require preservation to enhance and protect shelf life, encapsulate natural flavour, and retain nutritional content. Globally, agricultural products are preserved by a range of means, the most prevalent of which is the heat pump dryer, which produces the best results even in unfavourable climatic conditions. Heat pump dryers come in different types and their performance varies depending on the type. This study aims to evaluate recently developed heat pump dryers based on key performance indicators, impacts on food colour and nutritional content, techno‐economic, exergoeconomic, and environmental issues associated with the development of heat pump dryers, which are underrepresented in most of the existing heat pump dryers' reviews. This study also discusses mathematical drying kinetic models, and regulation or policy aspects related to the development of heat pump dryers. In the present study, the results on performance analysis indicate that heat pump dryers examined were effective in reducing drying time and obtaining high coefficients of performance ranging from 1.94 to 5.338 and specific moisture extraction rate ranging from 0.156 to 9.25 kg/kWh, as well as significantly reducing energy consumption by up to 80%. The nutritional composition and colour results show that heat pump dryers maintain the maximum nutrient content while also improving colour. The expansion valve has the lowest exergoeconomic factor of all heat pump dryer components, whereas the compressor has the highest cost of exergy destruction in general, according to the results of exergoeconomic analysis. Techno‐economic analysis results demonstrated that most developed heat pump dryers have short payback periods ranging from 1.6 to 3.6 years. However, due to a lack of research in this field, the environmental implications of heat pump dryers are unknown. As per the findings of this study, future research in this field should focus on the design of simple and low‐energy heat pump dryers, life cycle, techno‐economic, and exergoeconomic assessments.

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Section: Introductionmentioning

confidence: 99%

Comprehensive assessment of heat pump dryers for drying agricultural products

Loemba

Kichonge

Kivevele

2022

Energy Science & Engineering

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“…Figure 1 and Figure 2 show the drawing of passive and active solar dryers respectively. Observation of the drying time in minutes and moisture content in percentage as shown in Figure 3 and Figure 4 respectively (EL-Mesery et al, 2022). This observation is conducted to find the best drying method in order to get the maximum dehydration rate based on the open sun, passive, active mixed flow and active crosses flow.…”

Section: Conventional Greenhouse For Dehydrationmentioning

confidence: 99%

A Review of Dehydration Techniques of Greenhouse

Noor¹,

Zaiddy²,

Suleiman³

2023

IJAREMS

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This paper review on the latest development of greenhouses related to the dehydration process of dried food products. In general, greenhouses are categorized into two types of greenhouses: 1) Conventional greenhouses for dehydration, and 2) the Drying technology of greenhouses for dehydration. The greenhouses are compared based on the methodology, concept, objective, advantages, disadvantages, and limitations. The recommendation for the next development of technology that can be implemented in the smart greenhouse for dehydration is included in this paper.

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“…1 As a result, all countries loose ≥ 20% of their fresh produce, and considerable losses of ≤ 50% have been observed in Asia and Africa, per data on agrofood wastage. 2,3 Drying is one of the most popular preservation techniques for fresh produce. By lowering the moisture content (MC) to the point where microbial activity is minimal, this approach has proven to increase shelf life.…”

Section: Introductionmentioning

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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Recent developments in solar drying technology of food and agricultural products: A review

Cited by 72 publications

References 189 publications

Comprehensive assessment of heat pump dryers for drying agricultural products

Comprehensive assessment of heat pump dryers for drying agricultural products

A Review of Dehydration Techniques of Greenhouse

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

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