EXPERIMENTAL STUDY OF SORPTION ISOTHERMS AND DRYING KINETICS OF MOROCCAN<i>EUCALYPTUS GLOBULUS</i>

Kouhila, M.; Kechaou, Nabil; Otmani, M.E. El; Fliyou, M.; Lahsasni, Siham

doi:10.1081/drt-120015582

Cited by 103 publications

(73 citation statements)

References 10 publications

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“…These results concur with the observations of other authors for other species of wood (Themelin et al 1997;Fernandez et al 2014). The values are always positive because of the strong exothermic interaction between the water vapour and the sorption sites (Singh and Singh 1996;Kouhila et al 2002;Quirijns et al 2005a, b). Maskan and Gogus (1997) determined that a negative C g value is physically impossible.…”

Section: Resultssupporting

confidence: 94%

Juvenile and mature wood of Abies pinsapo Boissier: sorption and thermodynamic properties

et al. 2015

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For industrial processes, it is important to study the hygroscopicity and thermodynamic properties of juvenile and mature wood. Samples of Abies pinsapo Boiss. collected in the natural areas of the species in Spain were used to study these properties in both types of wood. The equilibrium moisture contents were obtained, and the 15, 35 and 50°C isotherms were plotted following the Guggenheim-Anderson-Boer-Dent model. The thermodynamic parameters were calculated using the integration method of the Clausius-Clapeyron equation. Chemical analyses, infrared spectra and X-ray diffractograms were applied to assess chemical modifications and possible changes in the cell wall structure. The chemical composition of the mature wood shows a decrease in the lignin and hemicelluloses content and an increase in the extracts and a-cellulose. The sorption isotherms for the three temperatures studied are higher in the mature wood than in the juvenile wood. Causes of this include the higher content of a-cellulose, the higher crystallinity index and the shorter crystallite length in the mature wood. No difference was found between the juvenile and mature wood in relation to the point of inflexion where the multilayer starts to predominate over the monolayer (approximately 30 %). In terms of the thermodynamic properties, the heat involved is greater in desorption than in adsorption, and more heat is involved in the mature wood than in the juvenile wood.

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Section: Resultssupporting

confidence: 94%

Juvenile and mature wood of Abies pinsapo Boissier: sorption and thermodynamic properties

et al. 2015

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“…2). These results are in agreement with the observation of earlier workers (Kouhila et al 2002;Lahsasni et al 2004;Shahi Navin et al 2009). …”

Section: Solar Drying Operationsupporting

confidence: 94%

Development of polyhouse type solar dryer for Kashmir valley

et al. 2011

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Polyhouse type solar dryer (PSD) consist of drying chamber, drying trays and exhaust fan was developed for drying fruits and vegetables. The relative humidity (RH) inside the PSD varied in between 21 to 74% as compared to outside RH which ranged from 40 to 75%. The performance was found suitable and resulted in efficient drying at low RH. The thermal performance test for PSD under full and no load testing conditions were calculated. The temperature inside the dryer was 62 to 76% higher than the ambient conditions. PSD was helpful in reducing the drying ranging from 33 to 53%. The capacity of PSD was 100-150 kg per batch. The economic cost of solar dryer was compared with mechanical drying for beneficial to local producer. The cost of PSD Rs 80,000 could recover within the period of 1.5 years by adopting solar drying technology.

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“…The C g value is positive due to the strong exothermic interaction between the water molecules and the sorption sites [56][57][58]. The K constant cannot be greater than one because sorption becomes infinite for water activities lower than 1 [59,60] ( Table 2).…”

Section: Discussionmentioning

confidence: 95%

Thermodynamic analysis of water vapour sorption behaviour of juvenile and mature wood of Abies alba Mill.

et al. 2015

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The hygroscopicity and thermodynamic properties of juvenile and mature wood of Abies alba Mill. were studied through the 15, 35 and 50°C sorption isotherms. The Guggenheim, Anderson and de Boer-Dent model was used to fit the isotherms. The thermodynamic parameters were obtained from the sorption isotherms by applying the integration method of the Clausius-Clapeyron equation. The chemical composition of both types of wood (extractives, lignin and carbohydrate polymer-cellulose and hemicellulose-content) was determined, and infrared spectroscopy and X-ray diffractograms were used to identify any chemical modifications and changes in the crystal structure of the cell wall. The mature wood has more cellulose and hemicellulose content and less extractives content than the juvenile wood. The shorter crystallite length in the mature wood creates a higher amount of amorphous zones and, as a consequence, a higher number of access areas to the -OH groups. The combination of these phenomena explains the different hygroscopic behaviour between the juvenile and the mature wood, as the latter has higher moisture content in the three isotherms. As regards the thermodynamic properties, the amount of energy involved in the sorption process is greater in the mature wood than in the juvenile wood.

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EXPERIMENTAL STUDY OF SORPTION ISOTHERMS AND DRYING KINETICS OF MOROCCANEUCALYPTUS GLOBULUS

Cited by 103 publications

References 10 publications

Juvenile and mature wood of Abies pinsapo Boissier: sorption and thermodynamic properties

Juvenile and mature wood of Abies pinsapo Boissier: sorption and thermodynamic properties

Development of polyhouse type solar dryer for Kashmir valley

Thermodynamic analysis of water vapour sorption behaviour of juvenile and mature wood of Abies alba Mill.

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