Design and performance evaluation of a passive flat plate collector solar dryer for agricultural products

Babar, Onkar A.; Tarafdar, Ayon; Malakar, Santanu; Arora, Vinkel Kumar; Nema, Prabhat K.

doi:10.1111/jfpe.13484

Cited by 52 publications

(19 citation statements)

References 25 publications

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“…Cleaned leaves were subjected to three different drying methods‐ solar drying, tray drying and microwave drying. Solar drying was carried out in an indirect type natural convection solar dryer developed and installed at the National Institute of Food Technology Entrepreneurship and Management (NIFTEM) under the Ministry of Food Processing Industries, Government of India (Babar et al., 2020). Solar drying was carried out under cross flow air pattern.…”

Section: Methodsmentioning

confidence: 99%

Thin‐layer drying of sadabahar ( Catharanthus roseus ) leaves using different drying techniques and fate of bioactive compounds

Kasara

Babar

Tarafdar

et al. 2020

J. Food Process. Preserv.

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Drying of Catharanthus roseus leaves offer easy utilization of its powder for medicinal purposes but is challenging due to temperature sensitivity of its bioactive constituents. In this work, C. roseus leaves were subjected to three economic drying techniques: solar, tray (40, 50, 60°C) and, microwave (450, 600, 900 W) to identify the best drying condition for retention of bioactives of C. roseus leaves. Semi‐empirical models that best defined the drying conditions were identified. Results revealed lowest moisture content (~1.2% d.b.), drying time (4–8 min) and activation energy (36.92 kJ/mol) with high moisture diffusivity (~10−9 m2/s) for microwave drying. For retention of bioactives, solar drying in natural convection mode performed well and may serve as a low‐cost drying strategy. However, leaves dried at 600 W microwave power showed higher antioxidants (152 mg TE/g), phenols (11.28 mg GAE/g), and flavonoids (59.69 mg/QE g) and is recommended for drying of C. roseus leaves. Practical application Identification of suitable drying method and conditions for the production of Catharanthus roseus leaf powder can promote its large scale manufacturing while retaining its innate bioactive compounds. Addition of the said powder or its extract in neutraceutical, pharmaceutical formulations, and in oncological ailments can enhance health benefits as these leaves contain essential polyphenols and important dimeric alkaloids like vincristine and vinblastin etc. Optimum C. roseus processing conditions especially for solar and microwave drying can help farmers in producing value added medicinal food products at the field level for generation of additional revenue at lower process cost.

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Section: Methodsmentioning

confidence: 99%

Thin‐layer drying of sadabahar ( Catharanthus roseus ) leaves using different drying techniques and fate of bioactive compounds

Kasara

Babar

Tarafdar

et al. 2020

J. Food Process. Preserv.

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“…Also, the average activation energy was found to be 36.39 kJ/mol for the dried mushroom. Babar, Tarafdar, Malakar, Arora, and Nema (2020) designed and fabricated an indirect type solar dryer with an energy storage device for drying button mushroom. It was observed that the equilibrium moisture content achieved by the dried mushroom in 33 hr and 21 hr for open sun drying and indirect type solar dryer, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effects of pretreatments on quality attributes, moisture diffusivity, and activation energy of solar dried ivy gourd

Elangovan

Natarajan

2021

J Food Process Engineering

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Effect of pretreatments and drying method on the ivy gourd and their drying characteristics such as rate of drying, moisture diffusivity and activation energy are studied. The ivy gourd samples are pretreated with four pretreatments such as ascorbic acid, lemon juice, sugar solution, honey dip, and control for 10 min. Pretreated and control (untreated) ivy gourd slices are dried in a single slope solar dryer. The solar dryer temperature is found to be in the range of 35-72 C at air velocity of 1 m/s. The effective moisture diffusivity of the dried ivy gourd samples is found to be best in ascorbic acid (7.90 × 10 −8 m 2 /s) followed by control samples (5.07 × 10 −9 m 2 /s), lemon juice samples (6.92 × 10 −9 m 2 /s), honey dip samples (3.05 × 10 −10 m 2 /s), and sugar solution samples (3.37 × 10 −10 m 2 /s). The activation energy of the dried ivy gourd is found as lowest in ascorbic acid (21.23 kJ/mol) followed by control samples (24.81 kJ/mol), lemon juice samples (26.06 kJ/mol), sugar solution samples (27.05 kJ/mol), and honey dip (27.79 kJ/mol) samples. The sensory analysis for the dried samples is performed in terms of taste, color and it is observed that honey treated sample given promising results followed by sugar solution, ascorbic acid, lemon juice, and control samples. Practical application Drying is a widely practicing technology in the postharvest food processing for their longer preservation. Most of the developing countries are facing huge loss in the vegetable postharvesting due to open drying methods. This is mainly due to the nonavailability of efficient solar drying facilities. This study proposed the most efficient solar drying method suitable for developing countries. Besides, quality of four different pretreatment ivy gourds is dried in a natural and forced convective single slope direct solar dryer and also dried in an open sun drying method. The effects of pretreatments on the moisture loss are analyzed and presented here. Based on the results, it is confirmed that, the pretreatments are the effective method for removing the moisture content of the food substances for longer period of preservation. 1 | INTRODUCTION Ivy gourd (Coccinia grandis) is a tropical plant from the pumpkin family and it is grown in several regions of south India. Ivy gourd is cost effective and it is widely available throughout the year. Its gives high yield from October-December (Rainy seasons). Ivy gourd is rich in β-carotene, which is a significant vitamin A precursor (Sinchaipanit,

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“…Babar, Tarafdar, Malakar, Arora, & Nema [32] designed a passive flat plate collector (FPC) with phase change material. The dryer was used to dry button mushroom, and its performance was compared to open sun drying.…”

Section: Passive Solar Dyermentioning

confidence: 99%

Recent advances in solar drying system: A Review

Razak

Tarminzi²,

Azmi³

et al. 2021

IJETS

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Research on solar dryer technology proliferates since it reduces the drying period while keeping nutritional values in the agricultural products. This paper presented a review of recent advances in the solar drying system. This review is composed of working principles and classifications of solar dryers. They were classified into two main elements: airflow modes, either passive or active, and the way heat is transferred: direct, indirect, mixed-mode, and hybrid. The hybrid system used several types of elements to supply additional heat in the drying system, as elaborated in this paper, such as the electrical heater, biomass, and photovoltaic system. The advantages and disadvantages of the solar dryer also being discussed in this paper

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Design and performance evaluation of a passive flat plate collector solar dryer for agricultural products

Cited by 52 publications

References 25 publications

Thin‐layer drying of sadabahar ( Catharanthus roseus ) leaves using different drying techniques and fate of bioactive compounds

Thin‐layer drying of sadabahar ( Catharanthus roseus ) leaves using different drying techniques and fate of bioactive compounds

Effects of pretreatments on quality attributes, moisture diffusivity, and activation energy of solar dried ivy gourd

Recent advances in solar drying system: A Review

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