| 1. |
- Ameen, Arman, 1976-, et al.
(författare)
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Energy saving, indoor thermal comfort and indoor air quality evaluation of an office environment using corner impinging jet ventilation
- 2023
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Ingår i: Developments in the Built Environment. - : Elsevier. - 2666-1659. ; 15
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Tidskriftsartikel (refereegranskat)abstract
- The performance of a corner based impinging jet ventilation system (CIJV) in an office environment was evaluated numerically. The evaluation was done both in terms of the local thermal comfort and the local indoor air quality. Three different inlet configurations were tested for a range of outdoor temperatures that included both winter and summer conditions. In terms of indoor air quality, the results showed that CIJV performed better than a traditional mixing system. The study also revealed that CIJV creates a stronger temperature stratification in summertime compared to wintertime. When evaluating the energy saving potential the results showed a possible reduction of 7% for the ventilation flowrate when the outdoor temperatures were between -15 °C and -5 °C, 8 % when the outdoor temperatures were between 0 °C and 10 °C and 9 % when the outdoor temperatures were between 15 °C and 25 °C.
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| 2. |
- Forth, Kasimir, et al.
(författare)
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BIM4EarlyLCA: An interactive visualization approach for early design support based on uncertain LCA results using open BIM
- 2023
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Ingår i: Developments in the Built Environment. - 2666-1659. ; 16
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Tidskriftsartikel (refereegranskat)abstract
- To meet the European climate goals in the building sector, a holistic optimization of embodied greenhouse gas (GHG) emissions using the method of life cycle assessments (LCA) are necessary. The early design stages have high impact on the final performance of the buildings and are characterized by high uncertainty due to the lack of information and not yet taken decisions. Furthermore, most current LCA approaches based on Building Information Models (BIM) require high expertise and experience in both BIM and LCA and do not follow an intuitive visualization approach for other stakeholders and non-experts. This paper presents a novel design-decision-making approach for reducing embodied GHG emissions by interactive, model-based visualizations of uncertain LCA results. The proposed workflow is based on open BIM data formats, such as Industry Foundation Classes (IFC) and BIM Collaboration Format (BCF), and is developed for decision support for non-LCA experts in the early design stages. With the help of a user study, the prototypical implementation is tested by 103 participants with different levels of experience in BIM and LCA based on a case study. We evaluate the proposed approach regarding the support of open BIM data formats, different LCA visualization strategies, and the intuitiveness of different approaches to visualizing uncertain LCA results. The user study results show a broad acceptance and need for open BIM data formats and model-based LCA visualization but less for visualizing uncertainties, which needs further research. In conclusion, this interactive, model-based visualization approach using color coding supports non-LCA experts in the design decision-making process in early design stages.
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| 3. |
- Ljunggren, Fredrik
(författare)
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Innovative solutions to improved sound insulation of CLT floors
- 2023
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Ingår i: Developments in the Built Environment. - : Elsevier Ltd. - 2666-1659. ; 13
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Tidskriftsartikel (refereegranskat)abstract
- Building with cross laminated timber (CLT) has gain increased interest over the last years, but in common to other wood-based building systems, inadequate low-frequency sound insulation is seen as a problem. This paper deals with two methods to improve the sound insulation of CLT panels, normally made from spruce: 1) heavy CLT, introducing compressed, i.e. densified, spruce as well as alternative wood species, and 2) elastic layer based upon shear motion. In addition to a series of laboratory measurements, a full-scale CLT floor made of two 60 mm birch panels with a 12 mm elastic layer in between was tested in a two-room test mock-up. The results from the acoustical measurements showed that the floor has about 7 dB greater airborne and impact sound insulation for one-third octave bands, 50–3150 Hz, compared to a standard CLT floor of the same total height.
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| 4. |
- Nilimaa, Jonny
(författare)
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Smart materials and technologies for sustainable concrete construction
- 2023
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Ingår i: Developments in the Built Environment. - : Elsevier. - 2666-1659. ; 15
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Forskningsöversikt (refereegranskat)abstract
- This paper presents a comprehensive review of current trends and opportunities for sustainable concrete construction, emphasizing the importance of adopting eco-friendly practices to mitigate the industry's environmental impact. Green concrete, supplementary cementitious materials, permeable concrete, cool concrete, and the use of local materials are explored as sustainable materials and technologies. Innovations like self-healing concrete, 3D-printed concrete, photocatalytic concrete, electrified machineries, and carbon capture, utilization, and storage principles are also discussed, highlighting their potential to improve the sustainability of construction practices. Challenges faced in implementing sustainable concrete construction practices, such as technical, economic, and social barriers, are also addressed. The roles of governments, industry, and academia in promoting sustainable concrete construction are examined, stressing the need for interdisciplinary collaboration and research. Lastly, emerging trends and technologies, including digitalization, data-driven approaches, and circular economy principles, are identified as critical factors in driving the transition towards sustainable concrete construction.
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| 5. |
- Tu, Haidong, et al.
(författare)
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Recent advancements and future trends in 3D concrete printing using waste materials
- 2023
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Ingår i: Developments in the Built Environment. - : Elsevier. - 2666-1659. ; 16
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Tidskriftsartikel (refereegranskat)abstract
- 3D concrete printing (3DCP) is an innovative construction technique that enables the creation of complex and customized structures. This technology offers advantages such as reduced waste materials, faster construction times, and the ability to produce unique designs with intricate details. This article reviews the latest advancements in the 3DCP technology, its potential to transform the building and construction industry, and the latest developments in the 3DCP systems, methodologies, materials, and applications. The article concludes that several parameters and concrete mix proportions heavily influence the 3DCP process. Using waste materials as supplementary cementitious materials can significantly improve the 3D-printed concrete’s rheology, but the excessive use can decrease the early strength. Lastly, using recycled sand in 3D printing can reduce the flexural stiffness and strength of the printed objects when loaded from different directions. The article also categorizes large-scale 3DCP technologies, highlighting the need to optimize printing ink for better economic and environmental outcomes using waste materials in 3DCP applications.
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