A review on thermal models for greenhouse dryers

Chauhan, Prashant Singh; Kumar, Anil; Gupta, Bhupendra

doi:10.1016/j.rser.2016.11.023

Cited by 52 publications

(25 citation statements)

References 35 publications

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“…A thermal model was introduced to estimate the air temperature inside the tunnel greenhouse on the basis of ambient conditions. During development of a model, subsequent assumptions were made (Chauhan, Kumar, & Gupta, ; Janjai, Intawee, Kaewkiew, Sritus, & Khamvongsa, ): Drying calculation depends on a thin film drying model. No air stratification inside the dryer. Specific heat of dryer cover, drying air, and product remains stable. The absorptivity of air is neglected. …”

Section: Methodsmentioning

confidence: 99%

Drying characteristics of amla candy in solar tunnel greenhouse dryer

Rajendra

Gawande

2018

J Food Process Engineering

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In this article, a forced convection solar tunnel greenhouse dryer is proposed for food processing, especially for amla candy. An investigation has been made to demonstrate the usefulness of thermal and mathematical modeling in forecasting the drying kinetics of agricultural commodity. A system of partial differential equations concerning the heat and mass transfer were presented and solved by Gauss Jordan elimination technique to determine the temperature of air during drying. The predicted air temperatures within the dryer agreed well with the experimental temperature data. Thin layer characteristics of the product were described by six different mathematical models. The statistical and graphical validation is executed to confirm the validity and accuracy of selected models. However, based on the drying curves, Modified Page model was designated as the best model. The dryer is better for mass production, superb transportability, effortless tracking, easy assembly of tunnels on the site makes it a Do It Yourself (DIY) kit. Practical applications Basically the drying is known as an energy‐intensive process, and in industries, it consumes a huge quantity of energy; whereas in the present time, energy saving is needed to pay adequate attention. However, the traditional method for processing of amla candy (open sun drying) is thermally inefficient due to several problems like contamination of product from foreign materials, degradation by overheating, untimely rainfall, uncontrolled drying, and long drying time. In order to minimize the limitations of open sun/mechanized drying and to improve the quality of dried product, author developed a simple and easy to use solar tunnel greenhouse dryer. The quality of solar dried amla candy is far better and could fetch around 20% extra price than that of open sun/mechanized drying. To make amla a fruit of mass, products need to be developed which are attractive, tasty and therapeutic values. Among various amla food products, candy is very popular.

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Section: Methodsmentioning

confidence: 99%

Drying characteristics of amla candy in solar tunnel greenhouse dryer

Rajendra

Gawande

2018

J Food Process Engineering

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“…The application of solar drying techniques is currently prevalent. In the literature, there are essential publications worldwide on developments in the design and operation of solar dryers to reduce drying times by increasing their efficiency without sacrificing the quality of the final product: open sun drying, natural or forced convective drying (T., Al-Ismaili, Janitha Jeewantha, & Al-Habsi, 2019), photovoltaic-ventilated mixed-mode greenhouse solar dryer (Vengsungnle et al, 2020), (Chauhan, Kumar, & Gupta, 2017), indirect type tunnel (Mewa et al, 2019), hybrid passive-mode and active-mode (Mohammed, Fatumah, & Shadia, 2020), hybrid solar dryer coupling evacuated tube collectors, flat plate collectors, supported with electric fan heaters and the system for modulating the velocity field of the drying air (Pangavhane & Sawhney, 2002).…”

Section: Solar Dryingmentioning

confidence: 99%

Design of an Indirect Dryer with Coupling of Solar Collectors and its Thermal Characterization by Drying the Mint Leaves (Mentha spicate)

Téllez

Castillo‐Téllez

Gerardo

et al. 2021

EJSD

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Man has used solar energy to dry perishable products for many years, managing to preserve a wide variety of foods naturally; drying is a method that highly respects the food's properties and nutritional content. The consumption of medicinal and aromatic herbs in Mexico is traditional and widespread. In this work, an analysis of an indirect solar dryer's thermal behavior was carried out with the coupling of solar technologies (water heaters and air collectors and photovoltaic pumping as an aid to the generation of hot air) comparing with electric oven drying in Campeche, Campeche, Mexico. The experimental results showed that the indirect tunnel type dryer that works with evacuated tubes and solar air heater simultaneously is the most efficient technology, with average drying times of 300 min and final humidity of 9.6%. A study of colorimetry, water activity, and drying speed was carried out to control the drying process. It was found that it is possible to use solar energy to dry food as a means of conservation in warm-humid climates, also obtaining significant energy savings and contributing to caring for the environment.

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“…Design of the greenhouse dryer de nes the performance of the setup. Greenhouse dryer with natural convection method is suitable for the products having low moisture content (Singh et al, 2016). Clean energy utilization of the greenhouse dryer extend it usage in all domain (Kant et al, 2016).…”

Section: Why Greenhouse Dryer For Leaves Drying?mentioning

confidence: 99%

Analyzing environmental parameters for drying of neem and moringa leaves in solar greenhouse dryer regions of southern India

Rajesh¹,

N²,

Sivakumar³

2020

Preprint

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The green foliage of plants plays a vital role in the Traditional Medical System(TMS). Especially neem and moringa contains rich nutrients and hence used for medicinal purpose, preserving and drying of these leaves are found to be most important. Using a solar greenhouse dryer(GHD) for this purpose reduces the cost of energy and maintains herbal's own multifarious spectrum of constituent substances.Drying of these herbals in solar greenhouse dryer depends on the duration of sunshine hours in a particular day, atmospheric pressure, air temperature, relative humidity, wind speed, rainfall, turbidity parameters and transmission coefficients. In the above parameters, finding the longest duration sun shine hours and the best intensity rate of the sunshine are considered to be important to get better performance from the dryer. This communication throws light on the (1) Best time to start the drying process in a particular day ,month and year in GPS co-ordinates (12.2253° N, 79.0747° E) of Tiruvannamalai, Tamilnadu (2) Fabrication of the experimental setup of solar greenhouse dryer (3) Conducting the test for reduction of moisture up to safe limit of moisture content (4) Experimental results are to be validated with the theoretical results.to control the replications of Dengue virus type-2.

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A review on thermal models for greenhouse dryers

Cited by 52 publications

References 35 publications

Drying characteristics of amla candy in solar tunnel greenhouse dryer

Drying characteristics of amla candy in solar tunnel greenhouse dryer

Design of an Indirect Dryer with Coupling of Solar Collectors and its Thermal Characterization by Drying the Mint Leaves (Mentha spicate)

Analyzing environmental parameters for drying of neem and moringa leaves in solar greenhouse dryer regions of southern India

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