Review on development, recent advancement and applications of various types of solar dryers

Singh, Pushpendra; Gaur, Manoj Kumar

doi:10.1080/15567036.2020.1806951

Cited by 23 publications

(4 citation statements)

References 108 publications

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“…The proper drying techniques are profitable for reducing the post-harvest losses of agricultural products [84]. The use of solar energy has been used for drying purposes since ancient times.…”

Section: Analysis On the Recent Trends Of Greenhouse Dryersmentioning

confidence: 99%

A Comprehensive State-of-the-Art Review on the Recent Developments in Greenhouse Drying

et al. 2022

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Drying via solar energy is an environmentally friendly and inexpensive process. For controlled and bulk level drying, a greenhouse solar dryer is the most suitable controlled level solar dryer. The efficiency of a solar greenhouse dryer can be increased by using thermal storage. The agricultural products dried in greenhouses are reported to be of a higher quality than those dried in the sun because they are shielded from dust, rain, insects, birds, and animals. The heat storage-based greenhouse was found to be superior for drying of all types of crops in comparison to a normal greenhouse dryer, as it provides constant heat throughout the drying process. Hence, this can be used in rural areas by farmers and small-scale industrialists, and with minor modifications, it can be used anywhere in the world. This article provides a comprehensive analysis of the development of solar greenhouse dryers for drying various agricultural products, including their design, thermal modelling methods, cost, energy, and environmental implications. Furthermore, the choice and application of solar photovoltaic panels and thermal energy storage units in the solar greenhouse dryers are examined in detail, with a view to achieving continuous and grid-independent drying. The energy requirements of various greenhouse dryer configurations/shapes are compared. Thermodynamic and thermal modelling research that reported on the performance prediction of solar greenhouse dryers, and drying kinetics studies on various agricultural products, has been compiled in this study.

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Section: Analysis On the Recent Trends Of Greenhouse Dryersmentioning

confidence: 99%

A Comprehensive State-of-the-Art Review on the Recent Developments in Greenhouse Drying

et al. 2022

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“…Of these, 670 studies were eliminated from the review, 563 for not meeting the criteria (cf. Table 1) and 107 due to lack of methodological clarity (28), type of solar dryer not mentioned (5), inclusion of non-passive solar dryers in the analysis (36), or a lack of included food quality parameters (38). Hence, only 18 studies are included in our review (Fig.…”

Section: General Findingsmentioning

confidence: 99%

Passive solar dryers as sustainable alternatives for drying agricultural produce in sub-Saharan Africa: advances and challenges

et al. 2021

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The lack of adequate techniques for food processing is among the reasons underlying food losses and high levels of hunger in Sub-Saharan Africa; the application of solar energy to dry agricultural products is one potential solution. However, the total replacement of traditional uses of solar energy is still far from reality. Therefore, in this study, we systematically review the academic literature testing passive solar drying systems in order to assess their performance. Then the main limitations and challenges for passive solar dryers developed in Sub-Saharan Africa are derived. The literature search reveals very limited research and a lack of standardized methods to assess solar dryer performance. Studies mainly report parameters related to dryers’ thermal performance and physical features, thus neglecting parameters related to the quality of dried products and economics. Standardized and robust methodologies are urgently needed for more accurate conclusions and comparability of study results. Moreover, successfully applying passive solar dryers as an alternative to the traditional use of solar energy requires overcoming challenges such as time consumption, limited quantities of dried products, and the periodic nature of solar radiation. Thus, given its ability to significantly improve the self-life of food and overcome the current limitations for effective utilization of solar dryers in SSA, the use of mixed mode passive greenhouse dryers is proposed.

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“…In order to develop a more efficient and sustainable solar dryer, Kiggundu et al (2016) had recommended the application of new scientific technologies such as computational fluid dynamics so that the design can be tested and optimized as per the requirements before fabrication. Singh and Gaur (2020) recommended direct type solar dryers for small-scale applications and the use of energy storage techniques for continuous drying operation during off shine period. Similar recommendations have also been made for domestic solar dryers (Shimpy et al, 2023a, b).…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of a domestic solar dryer: an analytical approach

Shimpy,

Kumar,

Kumar

2024

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PurposeFood loss and wastage is an issue of global concern and the household sector is one of the biggest contributors to this. Solar drying has been explored by many eminent researchers as a solution to this problem but there have been concerns about the lack in designs, higher cost, lower performance, and consumer acceptability. The present research aims to design a small-scale domestic solar dryer by using computer software.Design/methodology/approachResponse surface methodology (RSM) and computational fluid dynamics (CFD) are used to design the domestic solar dryer. Initially, design variables (inlet and outlet vent height) are identified and a design of experiments has been created using RSM for set of experimental runs. The experimental runs suggested by RSM were carried out using CFD simulation in COMSOL Multiphysics software and the results were used for optimization of response variables (outlet velocity and drying chamber temperature) in RSM.FindingsOutlet vent height was found to be most significantly affecting parameter to both the responses. The optimum values of inlet and outlet vent heights were 0.5 and 2.5 cm, respectively with the overall desirability of 0.728. The model accuracy was tested by conducting a confirmation test as post processing in design expert software.Originality/valueDesigning a solar dryer is a complex, costly and time consuming process, this study presents an easy, economic and fast method to design a new solar dryer. It would help researchers to design and develop new domestic as well as large size industrial solar dryer.

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Review on development, recent advancement and applications of various types of solar dryers

Cited by 23 publications

References 108 publications

A Comprehensive State-of-the-Art Review on the Recent Developments in Greenhouse Drying

A Comprehensive State-of-the-Art Review on the Recent Developments in Greenhouse Drying

Passive solar dryers as sustainable alternatives for drying agricultural produce in sub-Saharan Africa: advances and challenges

Design and optimization of a domestic solar dryer: an analytical approach

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