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Jalilzadehazhari, E., Pardalis, G., Johansson, J. & Johansson, P. (2019). Application of multi-objective optimization for resolving conflicts when selecting windows. In: The 9th International Conference on Sustainable Development in the Building and Environment(SuDBE2019)& the International Forum of Green and Healthy Buildings.: . Paper presented at The 9th International Conference on Sustainable Development in the Building and Environment(SuDBE2019)& the International Forum of Green and Healthy Buildings. Reading and Cambridge, UK. 22nd to 28th July 2019. Reading and Cambridge, UK
Open this publication in new window or tab >>Application of multi-objective optimization for resolving conflicts when selecting windows
2019 (English)In: The 9th International Conference on Sustainable Development in the Building and Environment(SuDBE2019)& the International Forum of Green and Healthy Buildings., Reading and Cambridge, UK, 2019Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Sweden passed legislation to achieve a target of net zero greenhouse gas emissions by the end of 2045. The Energy Performance of Building Directive further obliged European countries to ensure zero-energy building codes and improve the quality of indoor environments when buildings are renovated, as approximately 40% of total greenhouse gas emissions in Sweden are produced while heating buildings. Windows currently play a significant role in improving the quality of indoor environments and cutting total energy consumption, thereby reducing greenhouse gas emissions and mitigating environmental impact. Selecting a suitable window design is a complicated task compounded by two main difficulties: i) the availability of multiple window designs, each with a different glazing system, size, form and position; and ii) conflict between visual comfort, thermal comfort and energy consumption. Previous studies have primarily analysed a limited selection of window designs; however, analysing a wide variety of glazing systems, sizes, forms and positions will help resolve the abovementioned difficulties, thereby ensuring zero-energy building codes while improving the quality of an indoor environment. A multi-objective optimization was therefore completed to analyse the performance of a wide variety of window design variables and select suitable designs for an office room in Sweden. The results show the potential of multi-objective optimisation to resolve the difficulties of selecting suitable window designs.

Place, publisher, year, edition, pages
Reading and Cambridge, UK: , 2019
Keywords
multi-objective optimization, visual comfort, thermal comfort, energy consumption
National Category
Architectural Engineering
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-86972 (URN)
Conference
The 9th International Conference on Sustainable Development in the Building and Environment(SuDBE2019)& the International Forum of Green and Healthy Buildings. Reading and Cambridge, UK. 22nd to 28th July 2019
Projects
ProWOOD
Funder
Knowledge Foundation, 20130245
Note

Ej belagd 190829

Available from: 2019-07-24 Created: 2019-07-24 Last updated: 2019-08-28Bibliographically approved
Jalilzadehazhari, E., Johansson, J. & Mahapatra, K. (2019). Applying a decision-making framework for resolving conflicts when selecting windows and blinds. Architectural Engineering and Design Management, 15(5), 382-401
Open this publication in new window or tab >>Applying a decision-making framework for resolving conflicts when selecting windows and blinds
2019 (English)In: Architectural Engineering and Design Management, ISSN 1745-2007, E-ISSN 1752-7589, Vol. 15, no 5, p. 382-401Article in journal (Refereed) Published
Abstract [en]

The selection of the most appropriate window and blind design is a challenging task due to the existence of potential conflicts between visual comfort, thermal comfort, energy consumption and life cycle cost. Resolving these conflicts relies on a trade-off window and blind design. This research applied a decision-making framework to select a trade-off window and blind design for an office room in Sweden. The decision-making framework was developed based on integrating the non-dominated sorting genetic algorithm-II and the analytical hierarchy process. The first step in the application of the framework was to generate a model of the office room using EnergyPlus. Six types of window and four types of blind; an internal venetian blind, an internal roller curtain, an external venetian blind and an external overhang panel, were modelled in EnergyPlus. The second step was to run an optimisation using non-dominated sorting genetic algorithm-II. For this purpose, various window and blind design variables were specified in modeFRONTIER platform. The third and last step in the application of the decision-making framework was to select a trade-off window and blind design using analytical hierarchy process. The results show the strength of the decision-making framework in selecting a trade-off design, and thereby the ability to resolve conflicts through intelligent use of simulation in analyzing big-data in built environment, energy and cost sectors. Since, the computation and processing power for performing simulations is constantly increasing, architects and designers can exploit the decision-making framework and locate a trade-off design in a relatively short period of time.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
Decision-making, big data, optimisation, non-dominated sorting genetic algorithm II, analytical hierarchy process, trade-off design
National Category
Architectural Engineering
Research subject
Technology (byts ev till Engineering), Sustainable Built Environment
Identifiers
urn:nbn:se:lnu:diva-79039 (URN)10.1080/17452007.2018.1550383 (DOI)000482063700005 ()
Projects
ProWood
Funder
Knowledge Foundation, 20130245
Available from: 2018-12-01 Created: 2018-12-01 Last updated: 2019-09-24Bibliographically approved
Nilsson, J. & Johansson, J. (2019). Bending and Creep Deformation of a Wood-Based Lightweight Panel: An Experimental Study. Wood and Fiber Science, 51(1), 16-25
Open this publication in new window or tab >>Bending and Creep Deformation of a Wood-Based Lightweight Panel: An Experimental Study
2019 (English)In: Wood and Fiber Science, ISSN 0735-6161, Vol. 51, no 1, p. 16-25Article in journal (Refereed) Published
Abstract [en]

When wood is exposed to long-term loading, creep deformation can occur because of its viscoelastic characteristic. The aim of this study was to increase the understanding and knowledge of creep deformation of a wood-based lightweight sandwich-type panel and to see if this type of panel has similar properties for creep as solid wood has. This was done by means of a study based on experiments. The panel studied consisted of two face sheets of beech wood and a core of pinewood struts cross-glued to the face sheets. A solid beech panel was used as a reference. In all, there were 27 samples for the test. The densities of the lightweight panel varied from 165 to 297 kg/m(3), compared with the density of the solid panel of 705 kg/m(3). The study consisted of two parts: a bending test and a creep test. The bending test was used to determine the maximum failure load for the panel. For the creep test, 30% of the original failure load was used. When the results from the bending tests were ranked for load capacity in relation to density, the results for the lightweight panel varied from 9.0 to 18.0 m(4)/s(2), compared with the value of the reference panel at 27.3 m(4)/s(2). This measured how effective the panel was in withstanding bending loads in relation to their density. However, this was not to say that the panel with the highest value also took the highest load in absolute terms. If the creep deformation is instead ranked in relation to density, the results for the lightweight panel varied from 10.4 to 33.7 kg/m, compared with the value of the reference panel at 45.5 kg/m. As with the bending test, these values rank how effective the panel was in resisting creep deformation in relation to density.

Keywords
Lightweight panel, bending, creep, deformation, rupture
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-80284 (URN)10.22382/wfs-2019-003 (DOI)000456400500003 ()2-s2.0-85061498161 (Scopus ID)
Available from: 2019-02-07 Created: 2019-02-07 Last updated: 2019-08-29Bibliographically approved
Jalilzadehazhari, E., Johansson, J. & Mahapatra, K. (2019). Comparing the profitability of various renovation packages in Swedish residential building sector: case study. In: Sustainable built environment conference (SBE 2019). 6-7 August, Tokyo, Japan: . Paper presented at Sustainable built environment conference 2019 (SBE 2019), 6-7 August, Tokyo, Japan.
Open this publication in new window or tab >>Comparing the profitability of various renovation packages in Swedish residential building sector: case study
2019 (English)In: Sustainable built environment conference (SBE 2019). 6-7 August, Tokyo, Japan, 2019Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Swedish government adopted national targets to reduce total energy consumption and mitigate environmental impacts. At this point, detached houses play an important role, since they account for a large share of dwelling stock in this country. The majority of these buildings are affected by technical deteriorations in building envelopes and heating, ventilation and air condition systems. Accordingly, there is a need for a deep renovation strategy, which covers both energy efficiency measures and economic issues. Additionally, a deep renovation can improve indoor climate, which contributes to the enhanced health and wellbeing. Thus, the aim of this study is to compare the efficiency of eight different renovation packages in reducing energy consumption and providing economic benefits in a detached house in Sweden. The renovation packages include 1) improving the U-value of building envelopes; 2) adding a heat recovery for ventilation system; 3) installing a ground source heat pomp for supporting heat demand and domestic hot water; 4) combination of renovation package 1 and 2; 5) combination of renovation package 1 and 3; 6) combination of renovation package 2 and 3; 7) combination of renovation package 1, 2 and 3; and 8) combination of renovation package 1, 2, 3 along with installing photovoltaic cells for producing electricity. The reduction in energy consumption was calculated in kWh/m². year for each renovation package, while the economic benefit was obtained by calculating the payback period during a lifespan of 50 years and internal rate of return with interest rates of 1%, 3% and 6%. The results indicate that renovation package 8 has the highest potential in reducing total energy consumption, while renovation package 3 is the most profitable solution since it provides the shortest payback period with the highest internal rate of return. The results help to define and project efficient energy policies in Sweden.

Keywords
Energy efficiency, Detached houses, Internal rate of return, Payback period
National Category
Other Civil Engineering
Identifiers
urn:nbn:se:lnu:diva-87518 (URN)
Conference
Sustainable built environment conference 2019 (SBE 2019), 6-7 August, Tokyo, Japan
Projects
Prowood
Funder
Knowledge Foundation, 20130245
Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-08-14Bibliographically approved
Jalilzadehazhari, E., Johansson, P. & Johansson, J. (2019). Determinants of users’ acceptance of a computer-based system. In: 36th CIB W78 2019 Conference ICT in Design, Construction and Management in Architecture, Engineering, Construction and Operations (AECO), 18-20 September, 2019: . Paper presented at 36th CIB W78 2019 Conference ICT in Design, Construction and Management in Architecture, Engineering, Construction and Operations (AECO), 18-20 September, 2019. Newcastle, United Kingdom: University of Northumbria
Open this publication in new window or tab >>Determinants of users’ acceptance of a computer-based system
2019 (English)In: 36th CIB W78 2019 Conference ICT in Design, Construction and Management in Architecture, Engineering, Construction and Operations (AECO), 18-20 September, 2019, Newcastle, United Kingdom: University of Northumbria , 2019Conference paper, Published paper (Refereed)
Abstract [en]

Sweden has an ambitious target to attain 50% more efficient energy use by 2030. Improving the energy performance of buildings provides a great opportunity to achieve the above-mentioned target. At this point, windows play a substantial role in improving indoor environmental quality and reducing energy consumption and cost. A computer-based system was therefore developed, which allows selecting a suitable window design. The computer-based system was intended to be used in a large-sized window and door manufacturing company in Sweden. However, the benefits of implementing the computer-based system cannot be realized until users accept using it. Former literature employed the technology acceptance model to investigate the influence of external variables on cognitive beliefs and trace their effects on users’ intention and actual system use. A successful application of TAM relies on the specification of the external variable. Accordingly, this paper conducted a systematic literature review to determine the external variable, affecting users' acceptance, thereby extended TAM. The analyses of results showed that organizational, individual, technological and environmental characteristics were the most influential external variables when investigating determinants of users' acceptance toward a computer-based system. Organizational characteristics contained mainly top management support, training, organizational culture, and organizational size, while individual characteristics embraced users’ previous knowledge and experience. Technological characteristics comprised information quality and system quality, meanwhile environmental characteristics included fulfillment of regulations and competitiveness. The extended TAM overcomes limitations attributed to the unified theory of acceptance and use of technology model since it considers attitude as direct determinants of intentions. In addition, the extended TAM is advantageous when compared with technology, organization, environment framework, because it has clear constructs, which allows tracing the influence of external variables on cognitive beliefs, and thereby their effects on users’ intention and actual system use. The extended TAM will be used to investigate determinants of users’ acceptance of the computer-based system in the manufacturing company in Sweden and compare the effect of external variables on users' acceptance.

Place, publisher, year, edition, pages
Newcastle, United Kingdom: University of Northumbria, 2019
Keywords
Technology acceptance model, computer-based system, perceived usefulness, perceived ease of use
National Category
Building Technologies
Identifiers
urn:nbn:se:lnu:diva-89308 (URN)
Conference
36th CIB W78 2019 Conference ICT in Design, Construction and Management in Architecture, Engineering, Construction and Operations (AECO), 18-20 September, 2019
Projects
ProWOOD
Funder
Knowledge Foundation, 20130245
Note

Ej belagd 191008

Available from: 2019-09-26 Created: 2019-09-26 Last updated: 2019-10-08Bibliographically approved
Jalilzadehazhari, E., Johansson, P., Johansson, J. & Mahapatra, K. (2019). Developing a decision-making framework for resolving conflicts when selecting windows and blinds. Architectural Engineering and Design Management, 15(5), 357-381
Open this publication in new window or tab >>Developing a decision-making framework for resolving conflicts when selecting windows and blinds
2019 (English)In: Architectural Engineering and Design Management, ISSN 1745-2007, E-ISSN 1752-7589, Vol. 15, no 5, p. 357-381Article in journal (Refereed) Published
Abstract [en]

Windows and blinds play a significant role in both shaping energy consumption and enhancing indoor comfort. But there are still difficulties with selecting windows and blinds due to the existence of potential conflicts between visual comfort, thermal comfort, energy consumption and life cycle cost. A literature review was conducted with the purpose of developing a decision-making framework that resolves the conflicts, and allows selecting a window and blind design based on trade-off between visual comfort, thermal comfort, energy consumption and life cycle cost. The decision-making framework was developed by integrating non-dominated sorting genetic algorithm-II as an optimisation algorithm with analytical hierarchy process as a multi-criteria decision-making method. The optimisation algorithm considers different window and blind design variables and analyses multiple designs, while the multi-criteria decision-making method ranks the optimization results and selects a trade-off design. An operating package enabled the decision-making framework to be automated. The operating package was obtained by coupling EnergyPlus as a simulation tool and modeFRONTIER as an integration platform. The decision-making framework was developed to select a trade-off window and blind design through intelligent use of simulation in analysing big-data in built environment, energy and cost sectors. Application of the framework ensures the minimum visual and thermal comfort thresholds with the lowest energy demand and cost. Architects and designers can use the framework during the design or renovation phase of residential and commercial buildings.

 

Place, publisher, year, edition, pages
Taylor & Francis Group, 2019
Keywords
Trade-off design, big-data, optimization, multi-criteria decision-making, non-dominated genetic algorithm II, framework design, analytical hierarchy process
National Category
Architectural Engineering
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-65866 (URN)10.1080/17452007.2018.1537235 (DOI)000482063700004 ()
Funder
Knowledge Foundation
Available from: 2017-06-27 Created: 2017-06-27 Last updated: 2019-09-24Bibliographically approved
Jalilzadehazhari, E. & Johansson, J. (2019). Material properties of wooden surfaces used in interiors and sensory stimulation. Wood Material Science & Engineering, 14(4), 192-200
Open this publication in new window or tab >>Material properties of wooden surfaces used in interiors and sensory stimulation
2019 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 14, no 4, p. 192-200Article in journal (Refereed) Published
Abstract [en]

By covering interiors, such as walls, ceilings and floors, with wooden surfaces, one can change the quality of indoor environments and thereby affect both psychological and physiological responses. Psychological responses refer to individuals’ emotional reactions toward interiors, while physiological responses include changes in the activity of the brain, the autonomic nervous system, the endocrine system, and the immune system. The above-mentioned responses considered in this study are those caused by visual, auditory, olfactory and tactile stimulation from interior wooden surfaces. Although earlier studies have presented valuable information on this subject, questions remain about the material properties of wood which are associated with the stimulation. Specifying the material properties can support architects, designers and engineers who intend to use wood in interiors for improving psychological and physiological responses. A literature study therefore has been conducted to determine (i) the material properties of wood which are associated with sensory stimulation, and (ii) to specify relevant recommendations or requirements which should be fulfilled when covering interiors with wooden surfaces. The results show a lack of knowledge regarding the material properties of wood and the degree in which it affects sensory stimulation.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2019
Keywords
Wooden surfaces, Indoor environmental quality, Psychological responses, Physiological responses, Material properties
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-80444 (URN)10.1080/17480272.2019.1575901 (DOI)000472089500002 ()2-s2.0-85067313398 (Scopus ID)
Projects
ProWOOD
Funder
Knowledge Foundation, 20130245
Available from: 2019-02-12 Created: 2019-02-12 Last updated: 2019-08-29Bibliographically approved
Salim, R. & Johansson, J. (2018). Automation decisions in investment projects: a study in the Swedish wood products industry. In: Mauro Onori, Lihui Wang, Xi Vincent Wang & Wei Ji (Ed.), Proceedings of the 8th Swedish Production Symposium (SPS 2018): . Paper presented at 8th Swedish Production Symposium (SPS 2018), Stockholm, Sweden, May 16-18, 2018 (pp. 255-262). Elsevier
Open this publication in new window or tab >>Automation decisions in investment projects: a study in the Swedish wood products industry
2018 (English)In: Proceedings of the 8th Swedish Production Symposium (SPS 2018) / [ed] Mauro Onori, Lihui Wang, Xi Vincent Wang & Wei Ji, Elsevier, 2018, p. 255-262Conference paper, Published paper (Refereed)
Abstract [en]

The aim of this paper is to study which aspects are considered when automation decisions are being made in the wood products industry. The aspects were identified in several decision areas of manufacturing. The data collection was based on participation in meetings of an ongoing investment project. The findings demonstrate that in the first phases of an investment project, where the project idea is evaluated, the most critical aspect for decision makers is economic benefits. This paper will provide further insights on the underlying reasoning for decisions on automation of manufacturing in investment projects in the wood products industry.

Place, publisher, year, edition, pages
Elsevier, 2018
Series
Procedia Manufacturing, ISSN 2351-9789 ; 25
Keywords
Wood industry, Production, Manufacturing technology, Decision-making, Case study
National Category
Other Mechanical Engineering Robotics
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-78992 (URN)10.1016/j.promfg.2018.06.081 (DOI)2-s2.0-85065650565 (Scopus ID)
Conference
8th Swedish Production Symposium (SPS 2018), Stockholm, Sweden, May 16-18, 2018
Projects
ProWOOD
Funder
Knowledge Foundation
Available from: 2018-11-28 Created: 2018-11-28 Last updated: 2019-08-29Bibliographically approved
Johansson, J., Schauerte, T. & Lindblad, F. (2018). Balancing the production flow in prefabrication of wooden houses. In: Tools for sustainability: . Paper presented at Forest Products Society 72nd International Convention - Forest Products: Key To A Sustainable Future, June 11-14, 2018, Madison, USA.. Forest Products Society
Open this publication in new window or tab >>Balancing the production flow in prefabrication of wooden houses
2018 (English)In: Tools for sustainability, Forest Products Society, 2018Conference paper, Published paper (Refereed)
Abstract [en]

The industrialization of wooden house building processes from traditional on-site production to off-site prefabrication is challenging, concerning the possibility of effective handling of numerous product variants, where each house is more or less unique. To obtain high productivity in the production, a well-balanced flow with minimization of waste is of great importance. In Sweden, many off-site house producers are in the starting phases of introducing advanced automation technologies in their production processes and the need for a more detailed process control therefore increases. In previous studies, the installation of windows has been identified as a demanding step in the prefabrication process, since it often creates a bottleneck i.e. the most overloaded part of process (Slack et al., 2016) and thus negatively affects the cycle-time and a balanced production flow.This study aims to understand, how the effectiveness of windows installations could be improved. By using a multiple case-study methodology, processes of several companies are compared and discussed. Further, suggestions for improvements are made for one case company. The results show that a replacement of the windows installation could (a) shorten the cycle-time of one wall by more than 10 %, (b) reduce the queueing time for the entire wall assembly process by more than 48 % and consequently (c) help to create a more balanced production flow.

Place, publisher, year, edition, pages
Forest Products Society, 2018
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Technology (byts ev till Engineering), Sustainable Built Environment
Identifiers
urn:nbn:se:lnu:diva-76231 (URN)
Conference
Forest Products Society 72nd International Convention - Forest Products: Key To A Sustainable Future, June 11-14, 2018, Madison, USA.
Available from: 2018-06-20 Created: 2018-06-20 Last updated: 2019-05-20Bibliographically approved
Lindblad, F., Schauerte, T. & Johansson, J. (2018). Identifying market mobility barriers for wooden single-family house producers to enter the multifamily segment. In: Social Influences: . Paper presented at Forest Products Society 72nd International Convention - Forest Products: Key To A Sustainable Future,June 11-14, 2018, Madison, USA.. Forest Products Society
Open this publication in new window or tab >>Identifying market mobility barriers for wooden single-family house producers to enter the multifamily segment
2018 (English)In: Social Influences, Forest Products Society, 2018Conference paper, Published paper (Refereed)
Abstract [en]

In the past decades, the housing shortage in Sweden accumulated to a level that led to acute problems for many people combined with continuously rising housing prices. The market for single-family houses, where wood dominates with 85 – 90 % of market share, is highly competitive with many companies offering relatively similar products or services. To serve the demand on that market, only 38 % of the existing companies were needed. One way to tackle the existing housing shortage, and to develop new business opportunities, could be to get more companies from the single-family house industry to produce multi-family houses. Current competence in prefabricated house production could be utilised, yet, other areas could act as barriers for these companies. The aim of this study is to identify potential market mobility barriers for Swedish companies currently producing wooden single-family houses to develop towards the construction of multi-family houses. This will be conducted by initial interviews with decision makers in those companies, combined with a survey-study covering companies within the industry. The results show that the main market mobility barriers are related to the strong market presence of traditional building materials, lack of knowledge by the market of wood as a suitable building material and the importance of governmental guidance and actions.

Place, publisher, year, edition, pages
Forest Products Society, 2018
Keywords
Wooden single-family houses, Market mobility barrier, Wooden multi-family houses, Industry analysis, Market development strategies.
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:lnu:diva-76230 (URN)
Conference
Forest Products Society 72nd International Convention - Forest Products: Key To A Sustainable Future,June 11-14, 2018, Madison, USA.
Note

Ej belagd 180903

Available from: 2018-06-20 Created: 2018-06-20 Last updated: 2019-06-03Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0130-3356

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