Effect of regeneration heat and energy storage on thermal drying performance in a hardwood solar kiln

Khouya, Ahmed

doi:10.1016/j.renene.2020.03.178

Cited by 26 publications

(2 citation statements)

References 42 publications

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“…They obtained a reduced drying time of about 47%. Khouya shows that this solar dryer can reduce the energy consumption ratio by 91%, a reduction of drying time by 62.4% with a good heat generation [18]. Lamrani et al [19] presented an indirect hybrid solar dryer for temperate wood in the Moroccan climate and their results showed that solar collector can help to reduce annually the CO 2 emissions by 34%.…”

Section: Introductionmentioning

confidence: 99%

Experimental Modelling of a Solar Dryer for Wood Fuel in Epinal (France)

2020

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A solar dryer for wood was constructed and modelled based on the climatic condition of Epinal, France, during the summer, spring and winter seasons. The solar dryer was able to raise the temperature of the drying air by 38 °C in the spring and summer season with a global effective efficiency of 39%. Modelling of the drying of the log of wood was based on the global mass transfer coefficient and the geometric form of the log which was mostly cylindrical was considered. Validation was undertaken with the log covered with the bark. The coefficient of variations of numerical points with the experimental values given by the model was less than 5% with a mean average error and a mean relative error of 2.33% and 4.53%, respectively.

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Section: Introductionmentioning

confidence: 99%

Experimental Modelling of a Solar Dryer for Wood Fuel in Epinal (France)

2020

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“…However, the production of biopolymers from cellulose requires rigorous pretreatment of lignocellulose to separate it from lignin, and the subsequent biopolymer production requires deconstruction, derivatization or nanoparticle formation. Therefore, exploring methods for efficient lignocellulose extraction has become a hot research topic for efficient cellulose utilization [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of High-Temperature Hydrothermal Treatment on the Cellulose Derived from the Buxus Plant

Huo

Zhang²,

Yang

et al. 2022

Polymers

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Cellulose has attracted considerable attention as the most promising potential candidate raw material for the production of bio-based polymeric materials. In the last decade, significant progress has been made in the production of biopolymers based on different cellulose forms. In this study, cellulose was obtained in an innovative and environmentally friendly way, using boxwood powder. Crude cellulose was obtained by treating Buxus powder with an ethanol–acetic acid–water mixture. Refined cellulose was then obtained by treatment with an acidic sodium hypochlorite solution and alkaline hydrogen peroxide solution. The novel chemistry of cellulose prepared by this method promises to be not only green, but also highly desirable, because of its lower emissions and low cost. It is crucial for the future of the global polymer industry. The refined cellulose was subjected to a high-temperature hydrothermal treatment under two temperatures and time conditions, with temperature gradients of 120, 140, and 160 °C, and time gradients of 1, 2, and 3 h. The samples were subjected to infrared and thermogravimetric analyses. The cellulose undergoes dehydration and thermal degradation reactions during the heat treatment process, and the thermal stability of the residual is enhanced, compared with that of virgin cellulose. Between 120 and 140 °C, the hydroxyl and hypomethyl groups on the surface of cellulose are shed. Groups in the amorphous region of the polymer are the first to be shed. The dehydration reaction reduces the number of free hydroxyl groups on the surface of the cellulose molecules. The dehydration reaction was accelerated by an increase in temperature. Between 140 and 160 °C, the β-(1,4)-glycosidic bond begins to slowly break and some furans are generated. The structure of cellulose undergoes reorganization during thermal treatment. The thermal stability of the modified material is greater than that of untreated cellulose.

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Solar collector inspired by the polar bear: Fluorescent‐reinforcing photothermal conversion efficiency

Peng,

Wu,

Zhao

et al. 2024

J of Applied Polymer Sci

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The crucial point of solar thermal utilization makes solar heat collector gathering much attention. In this study, imitating polar bears' fur structure, fluorescent materials are modified into a solar heat collector, and the photothermal conversion is evaluated to examine the influence of polyvinyl alcohol concentration, fluorescent luminescence type and fluorescence concentration. The test results indicate that fluorescent materials that has a greater Stokes shift show the greater photothermal effect. Moreover, when composed of a PVA concentration being 5.0% and a fluorescent concentration being 0.50%, the composites exhibit the maximal photothermal conversion temperature (99.4°C) that is 17.9% higher than that of the solar heat collectors without fluorescent materials. This study proposes creating solar heat collector with modified fluorescent materials, and the new perspective of which demonstrates that the composites have a great potential and application prospect in the solar photothermal field.

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Effect of regeneration heat and energy storage on thermal drying performance in a hardwood solar kiln

Cited by 26 publications

References 42 publications

Experimental Modelling of a Solar Dryer for Wood Fuel in Epinal (France)

Experimental Modelling of a Solar Dryer for Wood Fuel in Epinal (France)

Effect of High-Temperature Hydrothermal Treatment on the Cellulose Derived from the Buxus Plant

Solar collector inspired by the polar bear: Fluorescent‐reinforcing photothermal conversion efficiency

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