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24 records – page 1 of 3.

Doweled cross Laminated Timber (DCLT) Building Air Tightness and Energy Efficiency Measurements: Case Study in Poland

https://research.thinkwood.com/en/permalink/catalogue3284
Year of Publication
2022
Topic
Energy Performance
Material
CLT (Cross-Laminated Timber)
Author
Swirska-Perkowska, Jadwiga
Wicher, Anna
Pochwala, Slawomir
Anweiler, Stanislaw
Böhm, Michal
Organization
Opole University of Technology
Publisher
MDPI
Year of Publication
2022
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Energy Performance
Keywords
Dowel Cross Laminated Timber
Air Tightness
Blower Door Test
Energy Efficiency
Research Status
Complete
Series
Energies
Summary
A contemporary challenge for the construction industry is to develop a technology based on natural building materials which at the same time provides high energy efficiency. This paper presents the results of an airtightness test and a thermal imaging study of a detached house built with technology using cross laminated dowelled timber panels. The thermal conductivity coefficients of the wood wool used to insulate the walls and ceiling of the building have also been measured, the linear heat transfer coefficients of the structural nodes have been numerically determined, and calculations have been made regarding the energy efficiency of the building. On the basis of the research, it was found that the air exchange rate in the analyzed building n50 is at the level of 4.77 h-1. Air leaks were also observed in the places of connection of longitudinal walls with the roof and at the junction of window frames with external walls. The experimentally determined thermal conductivity coefficient of the wood wool was ~10% higher than that declared by the manufacturer. Calculations for the energy performance certificate showed that an increase of ~10% in the thermal conductivity coefficient of the wood wool used to insulate the building results in a heating demand increase of 2.1%. It was also found that changing the value of the parameter n50 from 1.0 h-1 to 4.77 h-1 leads to a 40.1% increase in heat demand for heating the building. At the same time, the indicators for final energy demand EK and non-renewable primary energy demand EP increase by 18.1%.
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Chinese High Rise Reinforced Concrete Building Retrofitted with CLT Panels

https://research.thinkwood.com/en/permalink/catalogue2899
Year of Publication
2021
Topic
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Author
Contiguglia, Carlotta
Pelle, Angelo
Lai, Zhichao
Briseghella, Bruno
Nuti, Camillo
Organization
Roma Tre University
Fuzhou University
Editor
Rosa, Maria
Masi, Angelo
Publisher
MDPI
Year of Publication
2021
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Topic
Seismic
Keywords
Seismic Retrofitting
Energy Efficiency
Architectural Improvement
Reinforced Concrete
Research Status
Complete
Series
Sustainability
Summary
Cross laminated timber (CLT) panels have been gaining increasing attention in the construction field as a diaphragm in mid- to high-rise building projects. Moreover, in the last few years, due to their seismic performances, low environmental impact, ease of construction, etc., many research studies have been conducted about their use as infill walls in hybrid construction solutions. With more than a half of the megacities in the world located in seismic regions, there is an urgent need of new retrofitting methods that can improve the seismic behavior of the buildings, upgrading, at the same time, the architectural aspects while minimizing the environmental impact and costs associated with the common retrofit solutions. In this work, the seismic, energetic, and architectural rehabilitation of tall reinforced concrete (RC) buildings using CLT panels are investigated. An existing 110 m tall RC frame building located in Huizhou (China) was chosen as a case study. The first objective was to investigate the performances of the building through the non-linear static analysis (push-over analysis) used to define structural weaknesses with respect to earthquake actions. The architectural solution proposed for the building is the result of the combination between structural and architectonic needs: internal spaces and existing facades were re-designed in order to improve not only the seismic performances but also energy efficiency, quality of the air, natural lighting, etc. A full explanation of the FEM modeling of the cross laminated timber panels is reported in the following. Non-linear FEM models of connections and different wall configurations were validated through a comparison with available lab tests, and finally, a real application on the existing 3D building was discussed.
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Testing R22+ Wood-Frame Walls for Hygrothermal Performance in the Vancouver Climate: Field Wall Performance

https://research.thinkwood.com/en/permalink/catalogue2768
Year of Publication
2021
Topic
Energy Performance
Moisture
Material
Light Frame (Lumber+Panels)
Application
Walls
Author
Wang, Jieying
Organization
FPInnovations
Year of Publication
2021
Format
Report
Material
Light Frame (Lumber+Panels)
Application
Walls
Topic
Energy Performance
Moisture
Keywords
Mid-Rise
Energy Efficiency
Exterior Wall
Hygrothermal
Multi-Storey
Research Status
Complete
Summary
This new study aims to generate hygrothermal, particularly moisture-related performance data for light wood-frame walls meeting the R22 effective (RSI 3.85) requirement for buildings up to six storeys in the City of Vancouver. The overarching goal is to identify and develop durable exterior wood-frame walls to assist in the design and construction of energy efficient buildings across the country. Twelve test wall panels in six types of wall assemblies are assessed in this study. The wall panels, each measuring 4 ft. (1200 mm) wide and 8 ft. (2400 mm) tall, form portions of the exterior walls of a test hut located in the rear yard of FPInnovations’ Vancouver laboratory. This report, second in a series on this study, documents the performance of these wall assemblies based on the data collected over 19 months’ period from October 2018 to May 2020, covering two winter seasons and one summer.
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Advanced Industrialized Construction to Achieve High Building Energy Efficiency

https://research.thinkwood.com/en/permalink/catalogue2828
Year of Publication
2021
Topic
Energy Performance
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Building Envelope
Author
Wang, Jieying
Organization
FPInnovations
Year of Publication
2021
Format
Report
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Building Envelope
Topic
Energy Performance
Keywords
Prefabrication
Offsite Construction
Energy Efficiency
Retrofit
New Construction
Mid-Rise
Research Status
Complete
Series
InfoNote
Summary
Advanced industrialized construction methods enable complex building components and systems to be built with high precision and quality. This manufacturing technique has an advantage to provide cost-competitive and high energy efficient building components and systems for both retrofits and new construction. This document gives an overview of the use of prefabricated panels in building Net Zero Energy Ready wood-frame multi-unit residential buildings (MURBs) in Edmonton.
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A Review of Architectural and Structural Design Typologies of Multi-Storey Timber Buildings in Europe

https://research.thinkwood.com/en/permalink/catalogue2968
Year of Publication
2021
Topic
General Information
Application
Wood Building Systems
Author
Leskovar, Vesna
Premrov, Miroslav
Organization
University of Maribor
Publisher
MDPI
Year of Publication
2021
Format
Journal Article
Application
Wood Building Systems
Topic
General Information
Keywords
High-Rise
Mid-Rise
Multi-Storey
Energy Efficiency
Adaptability
Local Context
Research Status
Complete
Series
Forests
Summary
Numerous countries across the globe have witnessed the recent decades’ trend of multi-storey timber buildings on the rise, owing to advances in engineering sciences and timber construction technologies. Despite the growth and numerous advantages of timber construction, the global scale of multi-storey timber construction is still relatively low compared to reinforced concrete and steel construction. One of the reasons for a lower share of high-rise timber buildings lies in the complexity of their design, where the architectural design, the selection of a suitable structural system, and the energy efficiency concept strongly depend on the specific features of the location, particularly climate conditions, wind exposure, and seismic hazard. The aforementioned shows the need for a comprehensive study on existing multi-storey timber buildings, which correspond to the boundary conditions in a certain environment, to determine the suitability of such a construction in view of its adjustment to local contexts. Apart from exposing the problems and advantages of such construction, the current paper provides a brief overview of high-rise timber buildings in Europe. Moreover, it addresses the complexity of the design approach to multi-storey timber buildings in general. The second part of the paper highlights the importance of synthesising the architectural, energy, and structural solutions through a detailed analysis of three selected case studies. The findings of the paper provide an expanded view of knowledge of the design of tall timber buildings, which can significantly contribute to a greater and better exploitation of the potential of timber construction in Europe and elsewhere.
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Energy Performance Evaluation of a Ventilated Façade System through CFD Modeling and Comparison with International Standards

https://research.thinkwood.com/en/permalink/catalogue2777
Year of Publication
2021
Topic
Energy Performance
Material
Timber-Concrete Composite
Application
Building Envelope
Author
Pastori, Sofia
Mereu, Riccardo
Mazzucchelli, Enrico
Passoni, Stefano
Dotelli, Giovanni
Publisher
MDPI
Year of Publication
2021
Format
Journal Article
Material
Timber-Concrete Composite
Application
Building Envelope
Topic
Energy Performance
Keywords
Ventilation
Ventilated Façades
Performance
Thermo-Fluid Dynamic Analysis
Energy Efficiency
Natural Ventilation
Research Status
Complete
Series
Energies
Summary
Ventilated façades can help to reduce summer building thermal loads and, therefore, energy consumption due to air-conditioning systems thanks to the combined effect of the solar radiation reflection and the natural or forced ventilation into the cavity. The evaluation of ventilated façades behavior and performance is complex and requires a complete thermo-fluid dynamic analysis. In this study, a computational fluid dynamic (CFD) methodology has been developed for the complete assessment of the energy performance of a prefabricated timber–concrete composite ventilated façade module in different operating conditions. Global numerical results are presented as well as local ones in terms of heat flux, air velocity, and temperature inside the façade cavity. The results show the dependency of envelope efficiency on solar radiation, the benefits that natural convection brings on potential energy savings and the importance of designing an optimized façade geometry. The results concerning the façade behavior have been thoroughly compared with International Standards, showing the good accuracy of the model with respect to these well-known procedures. This comparison allowed also to highlight the International Standards procedures limits in evaluating the ventilated façade behavior with the necessary level of detail, with the risk of leading to design faults.
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Nested Buildings: An Innovative Strategy for the Integrated Seismic and Energy Retrofit of Existing Masonry Buildings with CLT Panels

https://research.thinkwood.com/en/permalink/catalogue2770
Year of Publication
2021
Topic
Design and Systems
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Hybrid Building Systems
Author
Valluzzi, Maria Rosa
Saler, Elisa
Vignato, Alberto
Salvalaggio, Matteo
Croatto, Giorgio
Dorigatti, Giorgia
Turrini, Umberto
Publisher
MDPI
Year of Publication
2021
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Hybrid Building Systems
Topic
Design and Systems
Seismic
Keywords
Nested Buildings
Seismic Retrofitting
Energy Efficiency
Integrated Intervention
Built Heritage
Masonry Buildings
Panels
Hybrid Structures
Italy
Research Status
Complete
Series
Sustainability
Summary
The Italian building heritage is aged and inadequate to the high-performance levels required nowadays in terms of energy efficiency and seismic response. Innovative techniques are generating a strong interest, especially in terms of multi-level approaches and solution optimizations. Among these, Nested Buildings, an integrated intervention approach which preserves the external existing structure and provides a new structural system inside, aim at improving both energy and structural performances. The research presented hereinafter focuses on the strengthening of unreinforced masonry (URM) buildings with cross-laminated timber (CLT) panels, thanks to their lightweight, high stiffness, and good hygrothermal characteristics. The improvement of the hygrothermal performance was investigated through a 2D-model analyzed in the dynamic regime, which showed a general decreasing in the overall thermal transmittance for the retrofitted configurations. Then, to evaluate the seismic behavior of the coupled system, a parametric linear static analysis was implemented for both in-plane and out-of-plane directions, considering various masonry types and connector spacings. Results showed the efficiency of the intervention to improve the in-plane response of walls, thus validating possible applications to existing URM buildings, where local overturning mechanisms are prevented by either sufficient construction details or specific solutions. View Full-Text
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A State of the Art of the Overall Energy Efficiency of Wood Buildings—An Overview and Future Possibilities

https://research.thinkwood.com/en/permalink/catalogue2943
Year of Publication
2021
Topic
Energy Performance
Application
Wood Building Systems
Author
Cabral, Matheus
Blanchet, Pierre
Organization
Université Laval
Editor
Koenders, Eddie
Publisher
MDPI
Year of Publication
2021
Format
Journal Article
Application
Wood Building Systems
Topic
Energy Performance
Keywords
Construction
Energy Efficiency
Embodied Energy
Mass Timber
Phase-Changing Materials
Post-and-Beam
Wood Composites
Wood-Frame
Research Status
Complete
Series
Materials
Summary
The main goal of this study was to review current studies on the state of the art of wood constructions with a particular focus on energy efficiency, which could serve as a valuable source of information for both industry and scholars. This review begins with an overview of the role of materials in wood buildings to improve energy performance, covering structural and insulation materials that have already been successfully used in the market for general applications over the years. Subsequently, studies of different wood building systems (i.e., wood-frame, post-and-beam, mass timber and hybrid constructions) and energy efficiency are discussed. This is followed by a brief introduction to strategies to increase the energy efficiency of constructions. Finally, remarks and future research opportunities for wood buildings are highlighted. Some general recommendations for developing more energy-efficient wood buildings are identified in the literature and discussed. There is a lack of emerging construction concepts for wood-frame and post-and-beam buildings and a lack of design codes and specifications for mass timber and hybrid buildings. From the perspective of the potential environmental benefits of these systems as a whole, and their effects on energy efficiency and embodied energy in constructions, there are barriers that need to be considered in the future.
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Passive House Performance in Cold Climates: a Review of the Envelope Performance and Energy Consumption of a Certified Research and Testing Facility in Canada

https://research.thinkwood.com/en/permalink/catalogue3349
Year of Publication
2020
Topic
Energy Performance
Application
Wood Building Systems
Author
Conroy, A.
Wimmers, G.
Organization
University of Northern British Columbia
Year of Publication
2020
Application
Wood Building Systems
Topic
Energy Performance
Keywords
Passive House
Hygrothermal Behavior
Energy Efficiency
Cold Climate
Energy Consumption
Research Status
Complete
Summary
The University of Northern British Columbia’s Wood Innovation Research Lab (WIRL) is the first industrial facility tested and certified to the International Passive House standard in Canada. Constructed using a glulam post and beam system and unique high-performance standing truss wall assembly, the building serves as a research and testing facility for University faculty and students. Temperature and humidity sensors were installed in the north and south wall façade during construction to measure the building’s hygrothermal performance. In addition, energy consumption meters were installed to measure the annual energy and heating demand of the building. Both the hygrothermal performance and energy use data are of interest due to the unique envelope design, the building’s location in a cold climate and the intended use of the building. Energy consumption results are compared to those calculated in the Passive House Planning Package (PHPP) model completed for the building. Initial findings after an eighteen-month data collection period found that the exterior walls did not experience 100% relative humidity during the data collection period but that high readings of relative humidity (>80%) did occur. The measured annual heating and energy demand of the WIRL exceeded the predicted consumption values calculated in the PHPP model due to occupant behavior, mechanical system operation inefficiencies and discrepancies that exist between modeled vs actual climate conditions.
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Acoustic Characteristics of Cross-Laminated Timber Systems

https://research.thinkwood.com/en/permalink/catalogue2618
Year of Publication
2020
Topic
Acoustics and Vibration
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Di Bella, Antonino
Mitrovic, Milica
Publisher
MDPI
Year of Publication
2020
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Acoustics and Vibration
Design and Systems
Keywords
Wooden Building Technology
Building Acoustics
Noise Control
Flanking Transmission
Energy Efficiency
Sustainability
Research Status
Complete
Series
Sustainability
Summary
The growing diffusion of cross-laminated timber structures (CLT) has been accompanied by extensive research on the peculiar characteristics of this construction system, mainly concerning its economic and environmental benefits, lifecycle, structural design, resistance to seismic actions, fire protection, and energy efficiency. Nevertheless, some aspects have not yet been fully analysed. These include both the knowledge of noise protection that CLT systems are able to offer in relation to the possible applications and combinations of building elements, and the definition of calculation methods necessary to support the acoustic design. This review focuses on the main acoustic features of CLT systems and investigate on the results of the most relevant research aimed to provide key information on the application of acoustic modelling in CLT buildings. The vibro-acoustic behaviour of the basic component of this system and their interaction through the joints has been addressed, as well as the possible ways to manage acoustic information for calculation accuracy improvement by calibration with data from on-site measurements during the construction phase. This study further suggests the opportunity to improve measurement standards with specific reference curves for the bare CLT building elements, in order to compare different acoustic linings and assemblies on the same base. In addition, this study allows to identify some topics in the literature that are not yet fully clarified, providing some insights on possible future developments in research and for the optimization of these products.
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24 records – page 1 of 3.