An investigation on solar drying: A review with economic and environmental assessment

Hage, Hicham El; Herez, Amal; Ramadan, Mohamad; Bazzi, Hassan S.; Khaled, Mahmoud

doi:10.1016/j.energy.2018.05.197

Cited by 159 publications

(61 citation statements)

References 152 publications

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“…One of ways to increase the profitability of production is the processing of raw grain, which allows not only to affect the quality of products, but also its added value. In the same time environmental issues of modern production are really important (El Hage, Herez, Ramadan, Bazzi, & Khaled, 2018). Various devices for the utilization of renewable energy sources, in particular solar collectors, are being introduced in industry.…”

Section: Research Questionsmentioning

confidence: 99%

Efficiency Of Solar Collectors For Drying Wheat

Oskin¹,

Kurchenko²,

Ilchenko³

2020

European Proceedings of Social and Behavioural Sciences

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Section: Research Questionsmentioning

confidence: 99%

Efficiency Of Solar Collectors For Drying Wheat

Oskin¹,

Kurchenko²,

Ilchenko³

2020

European Proceedings of Social and Behavioural Sciences

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“…A direct application is drying, which reduces spoilage of food after harvest. This technique is widely used in developing countries (Mohanraj & Chandrasekar, 2008;Queiroz et al, 2011;Shamekhi-Amiri et al, 2018) because of its low cost, low payback time (El Hage et al, 2018), and for providing increased income to small producers in a sustainable manner.…”

Section: Introductionmentioning

confidence: 99%

“…These characteristics make continuous dehydration of the food impossible, resulting in incomplete dehydration, an unsuitable product, or a product with unsatisfactory characteristics for consumption. The complete drying process, in most cases, is longer than the daily insolation period (El Hage et al, 2018). Thus, for the simpler solar dryers, the challenge is to ensure that the drying process is continuous, irrespective of periods of low insolation, such as cloudy or rainy days, and no insolation at night.…”

Section: Introductionmentioning

confidence: 99%

Hybrid System Simulation to Supply Heated Air to a Solar Food Dryer

Rodrigues

Basso

2020

Eng. Agríc.

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The intermittence of solar radiation, due to continuous rainy or cloudy days, is a limitation of simple and small solar dryers. These conditions often make them impossible to use. By including storage systems (thermal accumulation) and/or auxiliary energy sources, drying processes or dehydration can be conducted continuously, even during periods of low insolation. Therefore, the present work simulates and evaluates the thermal and energetic behavior of a hybrid system for heating the air that is directed to the dehydration chamber of a solar food dryer. The software selected for the simulation was TRNSYS. The simulated hybrid system consists of a flat plate solar collector and an arrangement of electrical resistors that guarantee the entry of air, at a constant temperature, into the dehydration chamber. The target temperature selected is 70 o C, and the absence of food products in the chamber is assumed. An arrangement with four electric resistors totaling 1900 W, with three different powers of 1000 W, 500 W, and 200 W proved adequate to guarantee the entrance of air at a constant temperature when considering the climatic conditions of a city in the South of Brazil.

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“…Drying is an effective way of preserving chili peppers because the thin walls of the plant can be dehydrated quickly and easily. The dried chili peppers are then stored in containers (Hage, Herez, Ramadan, & Bazzi, 2018). There are various drying methods used including mechanical (Daghigh, Ruslan, Sulaiman, & Sopian, 2010;Fatouh, Metwally, Helali, & Shedid, 2006;Qiu et al, 2016;Zlatanovi c, Komatina, & Antonijevi c, 2017), electrical (Nimrothama, Songprakorpa, Thepaa, & Monyakul, 2017), infrared (Aktas, Sevik, Amini, & Khanlari, 2016), dielectric (Jiang, Zhang, Fang, Mujumdar, & Xu, 2016) and solar (Janjai, Intawee, Kaewkiew, Sritus, & Khamvongsa, 2011;Kouchakzadeh, 2016;Prakash & Kumar, 2014;Sekyere, Forson, & Adam, 2016;Zarezade & Mostafaeipour, 2016).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of solar‐assisted heat pump dryer with heat recovery for the drying of chili peppers

Naemsai

Jareanjit

Thongkaew

2019

J Food Process Engineering

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This research investigated the performance of a solar‐assisted heat pump dryer (SAHPD) with heat recovery to reduce the amount of thermal energy needed for drying chili peppers. The dryer selected for the experimental study consisted of a heat pump, a greenhouse cover and multi trays. It was found that the SAHPD with recovery gave better drying performance than a traditional dying method. The dryer system can offer drying time, drying efficiency, coefficient of performance and specific energy consumption of approximately 24 hr, 33.2%, 3.17, and 2.21 kWh/kg, respectively. Furthermore, the SAHPD with heat recovery provided a higher drying performance than without the heat recovery although the ambient condition changed. Base on the economic analysis, the payback period and net present value of the SAHPD with heat recovery were approximately 1.9 years and 915.60 USD. The SAHPD with two drying rooms also yielded better drying performance than the SAHPD with one room. Practical applications Drying is the process of moisture reduction to a safe limit of moisture content, which allows agriculture to extend the shelf life of the crops by restraining the growth of microorganism. In chili peppers drying process, a solar assisted heat pump drying as one of hybrid solar dryers is preferred because heat and mass transfer rate are rather high and it offers the ability to operate both daytime and nighttime. However, the exhausted air to the ambient still has considerable thermal energy. Thus, the heat recovery system has been employed to design and fabricate inside the dryer. Findings of this research contribute to the evaluation of heat recovery in a typical solar assisted heat pump dryer in terms of drying efficiency and economic feasibility in order to be a guideline for small and medium‐sized enterprises.

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An investigation on solar drying: A review with economic and environmental assessment

Cited by 159 publications

References 152 publications

Efficiency Of Solar Collectors For Drying Wheat

Efficiency Of Solar Collectors For Drying Wheat

Hybrid System Simulation to Supply Heated Air to a Solar Food Dryer

Experimental investigation of solar‐assisted heat pump dryer with heat recovery for the drying of chili peppers

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