Thermal analysis and performance evaluation of a solar tunnel greenhouse dryer for drying peppermint plants

Morad, M. M.; Elshazly, Mostafa; Wasfy, K. I.; El-Maghawry, Hend A.M.

doi:10.1016/j.renene.2016.09.042

Cited by 70 publications

(37 citation statements)

References 9 publications

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“…The works on the drying modelling especially effects of these dryers on drying rates can provide useful information. For instance, Morad et al [92] carried out a study on solar tunnel greenhouse dryer which indicated that peppermints were better dried as leaves than as whole plant. The highest percentage volatile oil of 0.83% and 1.52% were obtained for whole plant and leaves when the system was operated at drying air flow rate of 2.10 m 3 •min -1 and loading rate of 2 kg•m -2 , respectively.…”

Section: Effect Of Different Drying Methods On Quality Of Agriculture Productsmentioning

confidence: 99%

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Recent advances in sustainable drying of agricultural produce: A review

et al. 2019

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Quests for sustainability, food security and need to decouple food prices from fluctuating prices of finite fossil fuels are the drivers to sustainable processing and storage of agricultural products.Farming predominantly takes place in rural areas where conventional energy technologies may either be expensive or sometimes technically infeasible to be obtained. This necessitates deployments of renewable energy technologies to remote areas for sustainable power generation, cooling and drying of agricultural product. Renewable systems e.g. solar dryers, solar hybrid dryers, combined power and drying system take leading roles in sustainable drying of farm produce. A number of research studies have been carried out in the past one decade, which mainly concentrate on modelling, simulation and experiment of different sustainable drying techniques. Therefore, this paper mainly aims to present a state of the art review on the contributions of combined power and drying, application of phase change materials and hybrid drying systems with regard to agricultural products. Based on this comprehensive summarization, it is indicated that deployment of biomass powered combined heat and power systems might be a good solution to post-harvest wastes since both electricity and heat for drying of agricultural products can be simultaneously obtained.

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Section: Effect Of Different Drying Methods On Quality Of Agriculture Productsmentioning

confidence: 99%

“…Solar tunnel greenhouse dryer Peppermint Better dried as leaves than as whole plant is observed. [92] Heat pump (HP) Grape pomace Part of the bioactive properties is lost in pomace samples.…”

Section: Ginger and Turmericmentioning

confidence: 99%

Recent advances in sustainable drying of agricultural produce: A review

et al. 2019

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“…So far, most of the CFD‐based research studies has tended to focus on: evaluating the accuracy of the numerical model in comparison to physical experiments (Amjad, Munir, Esper, & Hensel, 2015; Bartzanas, Boulard, & Kittas, 2004; Romero, Cerezo, Garcia, & Sanchez, 2014; Sanghi, Ambrose, & Maier, 2018; Sözen, Şirin, Khanlari, Tuncer, & Gürbüz, 2020), thermal efficiency evaluation (Abubakar et al, 2018; da Silva, Ferreira, Coutinho, & Maia, 2020; Erick César, Ana Lilia, Octavio, Isaac, & Rogelio, 2020; Lakshmi, Muthukumar, Layek, & Nayak, 2019; Morad, El‐Shazly, Wasfy, & El‐Maghawry, 2017; Orbegoso, Saavedra, Marcelo, & La Madrid, 2017; Tesfamariam, Bayray, Tesfay, & Hagos, 2015), and drying kinetics and optimization (Chen, Huang, Tsai, & Mujumdar, 2008; Goud, Reddy, Chandramohan, & Suresh, 2019; Hawa et al, 2021; Orbegoso et al, 2017; Vintilă, Ghiauș, & Fătu, 2014). In very rare research studies, the weather conditions were considered in the model (Sanghi et al, 2018; Tesfamariam et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

The effect of weather on temperature variation inside a solar dryer in Ahvaz‐Iran using computational fluid dynamics method

Sajadiye

Saberian

2021

J Food Process Engineering

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In subtropical hot desert climates, the high temperature inside the chamber of the solar dryers spoils heat‐sensitive bioactive ingredients of agricultural products. In this article, the annular temperature variation inside the dryer chamber and collector thermal efficiency of a naturally ventilated indirect solar dryer in Ahvaz‐Iran was evaluated using computational fluid dynamics models. Time variable boundary conditions based on the regional meteorological reports and Universal Time Coordinated for automatic consideration of solar heat radiation, were applied in the models. The results were validated against the physical experiments by accuracy evaluation of the chamber temperature (root mean squared error [RMSE] of 3.14°C), product moisture ratio (RMSE of 0.26), and solar heat flux (RMSE of 84.26 W/m2). The efficiency of the collector was shown to be minimal during the warm months from April to September with a higher level around the solar noon. Daily variation of the temperature inside the chamber from sunrise to sunset and the annual interval of each temperature lasts during a day were presented which can be used for defining the tolerable period of drying. The possibility of drying medicinal plants was presented as a sample. The results can provide a viable estimate for similar climates in the Middle East. Practical Applications In this study, many details of preprocessing procedure of solar drying computational fluid dynamics (CFD) simulation has been presented which is practical for related studies about the dryers or any process affected by variable weather and solar radiation. Graphical results are comparable and useful for numerical research studies on heat and mass transfer phenomena. The accuracy of the CFD model that was validated against the physical experiments, is promising for CFD‐based drying process optimization research studies. The results of physical experiments which have been expressed in good detail can be used as a reference for future research studies. The tolerable period of drying of agricultural products in Ahvaz‐Iran can be extracted from the results of this study which is a viable estimation for similar climates in the Middle East.

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“…It was found that the drying rate was increased by 22.78% and 24.8% for whole plants and leaves comparing with periodical system with a flow rate of 2.10 m 3 / min. 15 Experiments were conducted in a forced convection solar tunnel drier integrated with a shell and tube-based latent heat storage module. It was found that the thermal efficiencies of the first and second solar air heaters varied between 22.10-40.24% and 9.64-19.50%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Performance and CO₂ mitigation analysis of a solar greenhouse dryer for coconut drying

Ayyappan¹

2018

Energy & Environment

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A natural convection solar greenhouse dryer with biomass back-up heater was developed and tested for its performance during summer and winter months under the meteorological conditions of Pollachi, India, using coconuts as drying material. The dryer maintained the temperature between 33°C and 60°C during summer, 26°C and 43°C during winter periods. The biomass heater maintained the temperature inside the dryer between 35°C and 45°C during night. The coconuts were dried from an initial moisture content of 53% to a final moisture content of around 7% in 54 h in summer and 74 h in winter in the solar-biomass hybrid dryer compared to 153 h during summer and 247 h during winter in open sun drying. The thermal efficiency of the solar-biomass hybrid dryer was found to be 24% and 21%, respectively, during summer and winter time. The embodied energy of the dryer is found to be 18,302 kWh and the CO2 emission was 1518 kg per year. The net CO2 mitigation is 678 tonnes and the total carbon credit earned is $18,645. The payback period of the drier was found to be 3.3 years.

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Thermal analysis and performance evaluation of a solar tunnel greenhouse dryer for drying peppermint plants

Cited by 70 publications

References 9 publications

Recent advances in sustainable drying of agricultural produce: A review

Recent advances in sustainable drying of agricultural produce: A review

The effect of weather on temperature variation inside a solar dryer in Ahvaz‐Iran using computational fluid dynamics method

Performance and CO₂ mitigation analysis of a solar greenhouse dryer for coconut drying

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Thermal analysis and performance evaluation of a solar tunnel greenhouse dryer for drying peppermint plants

Cited by 70 publications

References 9 publications

Recent advances in sustainable drying of agricultural produce: A review

Recent advances in sustainable drying of agricultural produce: A review

The effect of weather on temperature variation inside a solar dryer in Ahvaz‐Iran using computational fluid dynamics method

Performance and CO2 mitigation analysis of a solar greenhouse dryer for coconut drying

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Product

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Performance and CO₂ mitigation analysis of a solar greenhouse dryer for coconut drying