Numerical analysis of hygrothermal properties and behavior of Korean based cross-laminated timber (CLT) wall system to deduce optimal assemblies

Yoo, Jiwon; Chang, Seong Jin; Lee, Jongki; Wi, Seunghwan; Kim, Sumin

doi:10.1016/j.jclepro.2018.12.221

Cited by 18 publications

(7 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A special field of study related to prefab CLT panels is the study of hygrothermal performance [56,57]. From the point of view of the presented research, there are certain gaps and limitations in this field of study.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Laboratory and Computational Models of Selected Thermal-Technical Properties of Constructions Systems Based on Wood

et al. 2020

View full text Add to dashboard Cite

Energy-efficient buildings, sustainable buildings, smart buildings, nearly zero-energy buildings, passive and active buildings are construction concepts widely recognised as setting the latest trends. The purpose of their design is to create an optimal thermal microclimate by means of heat flows that are either formed within it or enter into it. This research paper presents an analysis of the measurements of the density of heat flows, their spread in building constructions, all of which is examined in laboratory conditions and confronted with calculation models. The hypothesis of this research is to confirm or refute whether the computational models match the laboratory simulations in terms of thermal-technical parameters. The research uses a methodology designed for examining building constructions under virtually stable conditions. Two variants of external sandwich walls based on prefab cross laminated timber panels (variant A) and structural insulated panel (variant B) were proposed as the subject of the study. Both variants were subjected to research in laboratory conditions and computational simulations. For the sake of comparison, the calculation simulations that manufacturers of wood construction systems typically declare were also performed. The results of the analyses show significant differences between the theoretical or declared parameters and the values measured in laboratory conditions (7.5–32.6%). The deviations of the experimental measurements from the calculated or declared parameters were not as significant for variant A as they were for variant B. These findings show that for these analysed sandwich structures based on wood, it is not always possible to reliably declare calculated values of thermal-technical parameters. The publication is also a contribution to the current needs in the field of heating technology in terms of sustainability and the quality of internal environments.

show abstract

Section: Discussionmentioning

confidence: 99%

Comparison of Laboratory and Computational Models of Selected Thermal-Technical Properties of Constructions Systems Based on Wood

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Studies have been conducted that examine characteristics other than mould growth in combination with elevated or high moisture content (Alsayegh et al, 2013;Dietsch et al, 2014;Gamboa, 2017Gamboa, , 2018Kukk et al, 2019;Nairn, 2017;Schmidt et al, 2019;Singh et al, 2019;Thivierge, 2012;Wang, 2016). Several theoretical studies, however, have determined the risk of mould growth based on mould risk simulations or on the available literature (Brandner, 2013;Cho et al, 2019;Lepage, 2012;Lepage et al, 2017;McClung et al, 2014;Ö berg and Wiege, 2018;Wang et al, 2018;Yoo et al, 2019). However, these theoretical studies rarely include the critical construction parts that take the longest time to dry.…”

Section: Previous Studiesmentioning

confidence: 99%

CLT construction without weather protection requires extensive moisture control

Olsson

2021

Journal of Building Physics

View full text Add to dashboard Cite

This study examines how cross-laminated timber (CLT) constructions, including joints, connections and attachment points, are affected by precipitation during construction. The case studies are based on moisture content measurements and material sampling as well as microbiological analysis during the structure’s construction stage. The study does not include remediation control. The field measurements show microbiological growth in all buildings and almost all floor structures that were investigated. Of a total of 200 measuring points analysed, half had mould growth and around a third had moderate or extensive growth. The moisture content measurements for one of the locations with the largest percentage of elevated or high moisture content was at the top of the floor structure in the bottom gap between timbers in the CLT top layer. This is one example of several materials or construction components where there is limited possibility of dry out. Based on the outcome, it would appear difficult, or impossible, to avoid the appearance of microbial growth during construction with CLT without weather protection. Previous studies indicate that microbiological analysis of CLT is extremely rare in both laboratory and field studies, which implies that there are obvious shortcomings in the scientific work. The fact that mould growth is often invisible needs to be disseminated, especially in practical studies. However, there seems to be a good level of awareness in the literature that theoretical studies often conduct mould growth risk evaluations. There do not appear to be any moisture safety assembly methods or solutions for CLT construction that do not have weather protection or a declaration of the critical moisture conditions for CLT products.

show abstract

“…There are studies dealing with determining hygrothermal properties of different types of CLT, e.g. [12][13][14]. In [15] property data for hygrothermal simulations of CLT are suggested, based on earlier research at National Research Council of Canada and FPInnovations.…”

Section: Product Propertiesmentioning

confidence: 99%

Relying on reference cases when evaluating new technical solutions? Evaluation of technical documentation in a case study

Tengberg

Hagentoft

2020

E3S Web Conf.

View full text Add to dashboard Cite

Serial failures have occurred when introducing new technical solutions in the Swedish construction industry. In an earlier interview study exploring introduction of new technical solutions, documentation and reference cases provided by the supplier are given as the main sources for evaluation. This paper aims at addressing the questions: 1. What kind of documentation concerning building physics are provided by suppliers? 2. How well does the suppliers’ documentation meet the need for verification? In order to address these questions, the case of hygrothermal performance of cross laminated timber structures in multifamily dwellings was chosen. An inquiry of data was sent out to four suppliers at the Swedish market, asking for documentation and reference cases provided. Based on the documentation given, an assessment was made of to which extend the documentation can support verification of appliance to the relevant requirements of the Swedish building regulations. The case study shows reference cases are scarce and existing documentation is not comprehensive, thus indicating the building industry might have a disproportional high confidence in reference cases. The results will be used to suggest requirements for reference cases to be used for verification.

show abstract

Numerical analysis of hygrothermal properties and behavior of Korean based cross-laminated timber (CLT) wall system to deduce optimal assemblies

Cited by 18 publications

References 16 publications

Comparison of Laboratory and Computational Models of Selected Thermal-Technical Properties of Constructions Systems Based on Wood

Comparison of Laboratory and Computational Models of Selected Thermal-Technical Properties of Constructions Systems Based on Wood

CLT construction without weather protection requires extensive moisture control

Relying on reference cases when evaluating new technical solutions? Evaluation of technical documentation in a case study

Contact Info

Product

Resources

About