Moisture sorption isotherms and thermodynamic properties of Jack pine and palm wood: Comparative study

Ouertani, Sahbi; Azzouz, Soufien; Hassini, Lamine; Koubaa, Ahmed; Belghith, Abdelfettah

doi:10.1016/j.indcrop.2014.03.004

Cited by 46 publications

(24 citation statements)

References 27 publications

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“…Previous literature studies have observed similar shapes and magnitudes in isotherms in other bio-based materials, such as hemp and flax shives and fibers [20], hempcrete [21] and Jack pine and palm wood [22]. These suggest that the high sorption dynamics present in biobased materials may be attributed to the open material structures such as those also present in eelgrass.…”

Section: Eeg-l Eeg-70 Eeg-125 H S50%supporting

confidence: 70%

Water vapor sorption dynamics in different compressions of eelgrass insulation

et al. 2020

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Eelgrass shows potential in meeting the rising demands towards new, sustainable materials. It hosts a range of characteristics that benefits its application as a building material, such as thermal and acoustic insulating properties that can compete with conventional mineral wool insulation. However, as a porous bio-based building material, the moisture performance of eelgrass must be assessed to ensure its practical application. In this study, experimental investigations are conducted by a new automated vapor sorption analyzer (VSA) to measure adsorption and desorption of water vapor on different compressions of eelgrass insulation, ranging from loose strands to densely compacted insulation batts. Overall, higher sorption dynamics are observed in eelgrass insulation compared to conventional mineral wool insulation. Loose strands of eelgrass depict higher dynamics (including hysteresis) for the full range of relative humidity in comparison to insulation batts, potentially due to additional binder. Increasing the compression of eelgrass insulation batts results in lower sorption dynamics in the >70% relative humidity range. A Guggenheim-Anderson-deBoer model is applied that shows good fit with the experimental data and may be applied in moisture transfer calculations. This study furthers the potential of compressing eelgrass for application in passive design strategies through its moisture buffering capabilities.

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Section: Eeg-l Eeg-70 Eeg-125 H S50%supporting

confidence: 70%

Water vapor sorption dynamics in different compressions of eelgrass insulation

et al. 2020

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“…The equations giving small RSS and s and high R 2 are considered to describe the measurement data well. These three statistical error parameters can be calculated as follows: (1) Thermodynamic model [24] lnðm=m ref Þ ¼ f lnðawÞexpðaawÞ (2) Oswin model [33,34] m ¼ A½aw=ð1 À awÞ B (3) Feng & Fredlund (FF) model [30] S ¼ A=ðA þ P B c Þ (4) van Genuchten (VG) model [7,30] S ¼ ½1 þ ðaPcÞ n m (5) Feng & Xing (FX) model [30] S ¼ ½ln½e þ ðaPcÞ n Àm…”

Section: Sorption Isotherm Models and Fitting Methodsmentioning

confidence: 99%

Evaluation of moisture sorption models and modified Mualem model for prediction of desorption isotherm for wood materials

Zhang

Zillig

Künzel

et al. 2015

Building and Environment

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“…Para a determinação da pressão de espalhamento, uma relação empírica entre a atividade da água e a umidade de equilíbrio deve ser usada. No presente trabalho foi empregada a solução proposta por Dent (1977), fornecendo a forma final expressa pela Equação 8, Ouertani et al (2014).…”

Section: Entalpia E Entropia Integrais Líquidasunclassified

Comportamento Termodinâmico De Grãos De Uva Durante O Processo De Secagem

Johann¹,

Pereira²,

Silva³

2015

Anais Do XXXVII Congresso Brasileiro De Sistemas Particulados

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Foram determinadas as funções termodinâmicas diferenciais e integrais (entalpia e entropia) e o calor líquido isostérico de dessorção de grãos de uva cultivar Vitis vinífera. O calor total de dessorção calculado variou de 4864 a 2591 kJ/kg, análogo a dados da literatura, sendo que a quantidade de energia requerida para a dessorção aumentou com a redução do conteúdo de umidade. A entropia diferencial caiu drasticamente com o aumento da umidade, conforme literatura, apresentando valor máximo de 5,34 e mínimo de 0,77 J/mol K. A pressão de espalhamento, analisada nas temperaturas de 25, 35 e 50 °C, aumentou discretamente com o aumento da atividade da água, sendo que com o aumento da temperatura, os valores foram reduzidos, a mesma tendência foi observada na literatura para outras sementes. A entalpia integral permaneceu aproximadamente constante, 220 kJ/mol, sofrendo decréscimo acentuado a partir de 0,05 (b.s.), valores próximos aos da literatura. A entropia integral aumentou com o acréscimo do teor de umidade, variando ente aproximadamente -0,702 a 0,013 kJ/mol K, entre 0,01 e 0,07 (b.s.).

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Moisture sorption isotherms and thermodynamic properties of Jack pine and palm wood: Comparative study

Cited by 46 publications

References 27 publications

Water vapor sorption dynamics in different compressions of eelgrass insulation

Water vapor sorption dynamics in different compressions of eelgrass insulation

Evaluation of moisture sorption models and modified Mualem model for prediction of desorption isotherm for wood materials

Comportamento Termodinâmico De Grãos De Uva Durante O Processo De Secagem

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