Review on various modelling techniques for the solar dryers

Prakash, Om; Laguri, Vinod; Pandey, Anukul; Kumar, Anil; Kumar, Arbind

doi:10.1016/j.rser.2016.04.028

Cited by 87 publications

(35 citation statements)

References 66 publications

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“…In the last decades, several studies have been conducted (Ekechukwu & Norton, 1999;Murthy, 2009;El-Sebaii & Shalaby, 2012;El Hage et al, 2018;Lamidi et al, 2019;Anannob et al 2020). Most of them aim to increase the efficiency of solar dryers and even allow their nocturnal use (Queiroz et al, 2011;El Khadraoui et al, 2017), focusing on modeling (Prakash et al, 2016;Dhanushkodi et al, 2017;Anannob et al 2020), in the simulation (Hernandez et al, 2016;Sonthikun et al, 2016;Basso, 2017), and the experiment (Pangavhane et al, 2002;Mohanraj & Chandrase kar, 2008;Amer et al, 2010;Okoroigwe et al, 2013;Sonthikun et al, 2016;Bhardwaj et al, 2017;Shamekhi-Amiri et al, 2018) of different types of solar driers and sustainable drying techniques.…”

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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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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“…They are mainly utilized in agriculture and industries to reduce bacteria and preserve certain agricultural products (Aghbashlo, Mobli, Rafiee, & Madadlou, ). Solar dryers are mainly categorized into four modes: direct solar dryer (Zarezade & Mostafaeipour, ), indirect solar dryer (Prakash, Laguri, Pandey, Kumar, & Kumar, ), mixed solar dryer (Sekyere et al, ) and hybrid solar dryer (Kouchakzadeh, ).…”

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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“…Computational fluid dynamics (CFD) is a highly powerful tool to predict the performance and can help us to optimize the dryer geometry under given operating conditions without actually performing too many experiments. Various solar based designs like (a) solar air heater [6][7][8][9]; (b) drying systems such as direct, indirect, mixed [10][11][12] were simulated using computational fluid dynamics CFD modelling helps us to get the detailed inside look in the flow field development, temperature distribution [13], humidity profiling and drying time [14].…”

Section: Introductionmentioning

confidence: 99%

Augmenting natural convection and conduction based solar dryer

Chavan

Sikarwar

Tidke

et al. 2018

Proceedings of 21th International Drying Symposium

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Solar conduction dryer (SCD) is a unique technology that uses conduction, convection and radiation mechanism of heat transfer making it one of the most efficient drying system. The SCD is one of the most effective piece of equipment’s designed indigenously and it has tremendous potential to capitalize in erstwhile nations of tropical and torrid region where there is abundance of solar insolation. SCD, the most cost-effective dryer which runs on no electricity has already made inroads in the global market. In the present study, CFD studies were carried out for a given geometry and the corresponding boundary conditions. Keywords: Solar Energy; Solar Conduction Dryer; CFD modeling

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Review on various modelling techniques for the solar dryers

Cited by 87 publications

References 66 publications

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

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

Augmenting natural convection and conduction based solar dryer

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