Air-drying of seven clones of Eucalyptus grandis × Eucalyptus urophylla wood

França, Frederico José Nistal; Maciel, André Prata Villas-Boas; França, Tâmara Suely Filgueira Amorim; Silva, João Gabriel Missia da; Batista, Djeison César

doi:10.15376/biores.14.3.6591-6607

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…In this way, it is possible to find various types of drying in the literature, some of which can be classified as air drying (FRANÇA et al, 2019), conventional drying (LOIOLA et al, 2017), high-temperature drying (KLEMENT et al, 2019), vacuum drying (HE et al, 2019, high-frequency drying (CHAI; ZHAO; CAI, 2018), solar drying (CREMONEZ et al, 2020), among others.…”

Section: Introductionmentioning

confidence: 99%

The energy efficiency of a solar greenhouse for biomass drying

Cremonez,

Cordeiro,

Stremel

et al. 2023

Cad. Pedagógico

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Solar energy is a renewable, inexhaustible and clean source, it is becoming the main target of several applications, both domestic or industrial, cutting costs on electrical and thermal demands when compared with conventional sources. In the case of solar chamber, which makes use of incident solar radiation, it creates a favorable microclimate for drying inputs for reducing humidity to prevent the spread of biodegradable agents, on agricultural, forestry, and other products. With the objective to verify the energy efficiency of a prototype of the Greenhouse model, a solar chamber was built, where energy data and environmental variables were daily monitored in the drying process. For the determination of energy efficiency the ratio between converted energy into heat by the received energy was used. It was found that the chamber presented a daily energy gain of 220141,7 kJ, a daily thermal efficiency of 13,96% and up to 3 pm in 24,19%. The percentage difference in this efficiency is attributed to the chamber structure, which transmits and absorbs a higher percentage of solar energy during the day, but at night due to its transmissibility, emissivity properties, in addition to small structural failures that favor greater energy losses.

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Section: Introductionmentioning

confidence: 99%

The energy efficiency of a solar greenhouse for biomass drying

Cremonez,

Cordeiro,

Stremel

et al. 2023

Cad. Pedagógico

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“…Trees within the Eucalyptus genus are widely planted in certain countries to meet the demands from the wood industry and environmental protection due to their good biological features responding to fertilization, resistance to pests, and strong adaptations to the environment [1][2][3][4]. Most Eucalyptus wood are commonly used to produce lowvalue wood composite boards, pulp, and bio-refineries, etc., because they have certain technical difficulties related to processing, such as high internal stress and drying problems of internal checking, collapse, and a high transverse shrinkage [5][6][7]. However, the use of Eucalyptus wood as a resource of lumber for higher quality wood products has recently received extensive interest in some countries [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Samples Length on the Characteristics of Moisture Transfer and Shrinkage of Eucalyptus urophylla Wood during Conventional Drying

Liu

Zhou

et al. 2023

Forests

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Moisture transfer influences wood deformation and moisture content (MC) distribution during conventional drying of Eucalyptus urophylla wood. This study aims to investigate the effect of sample length (30, 100, and 200 mm) on moisture distribution and transfer in different directions and locations and on deformation of wood. The results showed that when the MC was above the fiber saturated point (FSP), the drying rate decreases exponentially with an increase of sample length; however, below the FSP, there was no obvious relationship between the drying rate and sample length and above the FSP, the moisture distribution was non-uniform along tangential, radial, and longitudinal directions and became even below the FSP, which was more significant in the middle location of wood. The greatest MC differences occurred between the surface and sub-central layers along the tangential and radial direction, which were between the end and sub-middle locations along the longitudinal direction. The effect of sample length on the MC distribution and MC differences along wood in the three directions depended on locations and the MC stage of wood; most of the free water and bound water transferred from the wood central to the ends along the longitudinal direction for three sets of samples. Bound water diffusion significantly slowed as the sample length exceeded 200 mm; sample length affects wood collapse and its recovery, but the drying rate has a lesser effect on collapse for samples with a length below 200 mm.

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Effect of growth stress and interlocked grain on splitting of seven different hybrid clones ofEucalyptus grandis×Eucalyptus urophyllawood

França

Vidaurre

2020

Holzforschung

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Trees with high levels of growth stress begin to show log end splits (LES) immediately after harvesting, usually reaching its maximum end split in a week, and these tensions also create splits during lumber manufacturing. Interlocked grain is another characteristic that impacts the properties of eucalyptus wood. The aim of this study was to evaluate the effect of growth stress and interlocked grain patterns on log end splitting of seven different hybrid clones of Eucalyptus grandis × Eucalyptus urophylla planted in Brazil. The growth stress indicator (GSI) was measured in standing trees before harvesting. Splits were measured on logs in three different stages, and interlocked grain from wood blocks was obtained across the center of the cross-section. The results showed that LES occurred as soon as the trees were harvested; however, for better selection of clones, LES should be evaluated after a week of harvesting. There were statistically significant correlations for GSI with LES. Clones that presented higher values of interlocked grain tended to develop lower values of GSI and LES. Using GSI and interlocked grain measurements, it was possible to select the most indicated eucalyptus clones for lumber production.

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Air-drying of seven clones of Eucalyptus grandis × Eucalyptus urophylla wood

Cited by 4 publications

References 16 publications

The energy efficiency of a solar greenhouse for biomass drying

The energy efficiency of a solar greenhouse for biomass drying

Effect of Samples Length on the Characteristics of Moisture Transfer and Shrinkage of Eucalyptus urophylla Wood during Conventional Drying

Effect of growth stress and interlocked grain on splitting of seven different hybrid clones ofEucalyptus grandis×Eucalyptus urophyllawood

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