Phase change material impregnated wood for passive thermal management of timber buildings

Temiz, Ali; Hekimoğlu, Gökhan; Demirel, Gaye Köse; Sarı, Ahmet; Amini, Mohd Hazim Mohamad

doi:10.1002/er.5679

Cited by 40 publications

(17 citation statements)

References 47 publications

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“…An optimum mass percentage gain of 29.9 mass% and a latent heat value of 20.62 J g −1 was reported. Temiz et al [24] studied Scots pine sapwood impregnated with an eutectic mixture of capric acid (CA) and stearic acid (SA). After thermal characterization of the material, it was concluded that the system wood/CA-SA can be used for indoor temperature regulation and energy saving in timber buildings.…”

Section: Introductionmentioning

confidence: 99%

Solid wood impregnated with a bio-based phase change material for low temperature energy storage in building application

Nazari

Jebrane

Terzıev

2022

J Therm Anal Calorim

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Wood impregnated with a multicomponent mixture of fatty acids as a bio-based phase change material (BPCM) to improve its thermal characteristics was studied. The studied wood/BPCM composites can be used as internal elements in buildings for energy storage. Scots pine and beech sapwood were impregnated with a multicomponent mixture of linoleic acid and coconut oil fatty acids at a ratio of 20:80. Leakage test was conducted and revealed that the maximum leakage for pine and beech were 9 and 8%, respectively. Light microscopy was employed to demonstrate the distribution of the BPCM in the wood structure. Rays in both pine and beech wood served as pathways for impregnation of the BPCM to partly fill the tracheid lumens (pine) and vessels (beech). Thermal characterization of the studied samples employed T-history and DSC methods, concluding that the impregnated wood had significant thermal mass, ability to store excessive energy in terms of latent heat and keep the temperature constant for long time. The specific heat capacity of the impregnated samples was 4–5 J g−1 K−1 i.e., higher than that of the untreated control samples of ca. 2 J g−1 K−1. The thermal conductivity of the samples before and after the impregnation was measured using heat flow meter method and the results showed that the untreated beech wood had higher thermal conductivity compared to pine and the parameter improved when the cell lumens were filled with the BPCM. Scots pine wood with to 80% mass percentage gain (MPG) after impregnation demonstrated an increment in thermal conductivity of 33% while Scots pine and beech with 43 and 38% MPG demonstrated an increase of the conductivity with 8 and 11%, respectively.

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Section: Introductionmentioning

confidence: 99%

Solid wood impregnated with a bio-based phase change material for low temperature energy storage in building application

Nazari

Jebrane

Terzıev

2022

J Therm Anal Calorim

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“…Solid wood of alder 26 with 29.9 wt% retention of paraffin and coated with polystyrene to prevent leakage of the PCMs showed a latent heat value of 20.62 J/g. Temiz et al 27 studied Scots pine sapwood impregnated with a eutectic mixture of capric acid (CA) and stearic acid (SA). After thermal characterization of the material, it was concluded that the system wood/CA‐SA can be used for indoor temperature regulation and energy saving in timber constructions.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance and mold discoloration of thermally modified wood containing bio‐based phase change material for heat storage

et al. 2022

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The work presents the results of thermal performance and mold discoloration of thermally modified wood‐based composites incorporating multicomponent fatty acids as a bio‐based phase change materials (BPCM). Thermally modified Scots pine (TMP), beech (TMB), and spruce (TMS) sapwood were impregnated with a multicomponent mixture of linoleic acid and coconut oil fatty acids at a ratio of 20:80. Samples with different BPCM uptakes were analyzed in the temperature range typical for building indoor conditions. Leakage tests were conducted and revealed that the maximum leakage for all the samples is 3% to 5%. T‐history and heat flowmeter methods were used to evaluate the thermal characteristic of the composites. The incorporation of BPCM into thermally modified woods (TMWs) resulted in significant thermal mass improvements, expressed by the ability of the composites to store excessive energy in terms of latent heat and keep the temperature constant for long time. The specific heat capacity of the TMWs was around 2 J/g K, which increased to 4 to 8 J/g K after impregnation with BPCM, depending on the impregnation uptake. Results showed also that TMB has higher thermal conductivity than TMP and TMS, while incorporating of BPCM into these materials resulted in even improved thermal conductivity. Results showed that the thermal conductivity of TMP increased after incorporation of BPCM from 0.06 W/m K to 0.1 and 0.14 W/m K for TMP/BPCM with 48% and 95% uptake respectively. Mold tests showed that BPCM encapsulated in TMWs is less susceptible to mold discoloration compared to untreated wood.

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“…In Anatolia, wood is expressed as a most versatile raw material that is needed from cradle to grave. Wood has been used for thousands of years and has emerged as an important sustainable building material to potentially replace steel and concrete because of its economic and environmental advantages, which include energy savings, low carbon emissions (15 kg/m 3 ), and high carbon storage (250 kg/m 3 ) (Wimmers 2017;Temiz et al 2020). The popularity of the use of wood in space is also increasing.…”

Section: Introductionmentioning

confidence: 99%

Effect of freezing temperature on impact bending strength and shore-D hardness of some wood species

Özkan

2022

BioRes

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Wood is exposed to variable environmental conditions during its use. Low temperature is one of the most important environmental factors affecting the behavior of wood in use. Contrary to other mechanical properties, there are not enough studies on how the impact bending strength is affected during freezing of wood. This study evaluated the effect of various freezing temperatures (-20, -40, -78.5, and -196 °C) on the impact bending strengths of beech (Fagus orientalis Lipsky), Scotch pine (Pinus sylvestris L.), fir (Abies nordmanniana subsp. bornmulleriana), and spruce (Picea orientalis L.) wood in comparison with non-frozen wood (+20 °C). During the freezing, the impact bending strength generally increased in softwood species but decreased in hardwood. The highest drop in impact bending strength value of -30.6% was found at -196 °C for beech wood. For this reason, precautions should be taken when using beech wood at ultra-low temperatures, due to substantial decreases in impact bending strength values. The good impact bending strength properties of the softwood while frozen allows application in low temperature environments.

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Phase change material impregnated wood for passive thermal management of timber buildings

Cited by 40 publications

References 47 publications

Solid wood impregnated with a bio-based phase change material for low temperature energy storage in building application

Solid wood impregnated with a bio-based phase change material for low temperature energy storage in building application

Thermal performance and mold discoloration of thermally modified wood containing bio‐based phase change material for heat storage

Effect of freezing temperature on impact bending strength and shore-D hardness of some wood species

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