1.
Österbring, Magnus, 1986, et al.
(författare)
Explorative life-cycle assessment of renovating existing urban housing-stocks
2019
Ingår i: Building and Environment. - : Elsevier BV. - 0360-1323 .- 1873-684X. ; 165
Tidskriftsartikel (refereegranskat) abstract
Urban building-stocks are responsible for a significant share of resource and energy use. To quantify the potential for reducing energy and environmental impact, building-stock modelling (BSM) is commonly used. Recently, the focus of BSM has expanded to include environmental impacts and life-cycle assessment (LCA). However, impact categories are often limited to climate change and representative buildings are often used. In addition, the future state of the stock is often calculated as a step-change to highlight the technical potential of an ideal future state. The aim of this paper is to assess the environmental impact of the future development of an urban housing-stock under business-as-usual scenarios using a building-specific GIS based model applied to the multi-family building stock of the City of Gothenburg. This paper uses an explorative LCA to account for environmental impacts based on dynamic uptake of common renovation measures and resulting energy savings until 2050. Two main scenarios are used where the renovation logic is based on either end-of-life of components or cost-effectiveness and further divided using limiting factors regarding investment capacity and annual share of the stock to be renovated. Results show possible energy savings of up to 23% and a corresponding 31% reduction in greenhouse-gas emissions. Greenhouse-gas emissions avoided due to reduced energy demand are offset by up to 65% by accounting for material use due to construction related renovation measures. For scenarios that favour construction related interventions, PV panels are responsible for the major part of the environmental impact across the 15 mid-point indicators used.
2.
Femenias, Paula, 1966, et al.
(författare)
Renovating the Housing Stock Built Before 1945: Exploring the Relations Between Energy Efficiency, Embodied Energy and Heritage Values
2018
Ingår i: Springer Proceedings in Energy: Cold Climate HVAC 2018, Kiruna, Sweden, 12-15 March, 2018. - Cham : Springer International Publishing. - 9783030006617 - 9783030006624 ; , s. 291-301
Konferensbidrag (refereegranskat) abstract
Swedish multi-family buildings constructed before 1945 constitutes an important part of the national built heritage. However, the majority does not have a formal heritage protection. Part of this building stock has already been renovated, notably through earlier energy saving programmes where additional exterior insulation, new façades and windows were frequently installed with little consideration for the original architecture. Now, 40 years later, these buildings face new renovations. This provides opportunities to improve the energy efficiency, indoor climate and user comfort. At the same time, the original architectural and historical characters lost in previous renovations could be recreated. In this paper, an inter-disciplinary research team illustrates the challenges met in practice to reach a sustainable renovation based on three cases. The case buildings are so-called "Landshövdingehus”, constructed in the 1930s and owned by a public housing company. The relations between building physics, energy efficiency, embodied energy, and the effect on heritage aspects in renovation are studied. The results demonstrate the potential to reach 30% calculated energy efficiency without investing in ventilation systems. When comparing embodied energy to savings in operational energy a short payback time is achieved. However, focusing on the replacement of windows, the cases illustrate difficulties to recreate heritage values at same time as achieving an air-tight and energy efficient construction. In order to improve the results from a heritage point of view, there is a need for quality assurance of the renovation and building permit process.
3.
Femenias, Paula, 1966, et al.
(författare)
Value creation by re-renovation – focus on the user perspective
2018
Ingår i: Proceedings of the 3rd International Conference on Energy Efficiency in Historic Buildings, EEHB2018. ; , s. 172-181
Konferensbidrag (refereegranskat) abstract
Historic multi-residential buildings that have been renovated at an earlier occasion are today facing new interventions. Re-renovation defines a concept for a second major renovation which opens up for the possibility of re-creating architectural and heritage values that has been lost in earlier renovations at the same time as demands for modernisation, energy efficiency, and economy are met. This paper focuses on what values heritage and historic buildings represent for residents, how they perceive the effects of energy renovation, what building elements they appreciate, and the implications for carrying out re-renovation. An empirical study of two cases with rental and owner-occupied housing has been applied combing a questionnaire survey (n= 83) and interviews (n=9). Findings indicate that historic buildings create values for their residents which should be considered by property owners when planning a renovation or re-renovation. Methodologically, asking residents about heritage values is challenging and the paper provides suggestions for further research in the field.
4.
Thuvander, Liane, 1970, et al.
(författare)
Takrenovering med solceller – en enkätstudie
2018
Ingår i: Bygg & teknik. - 0281-658X. ; , s. 15-18
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt) abstract
Hur resonerar fastighetsägare kring solcellsinstallation i samband med en takrenovering? Vad krävs för att öka installationstakten av solcell er och varför väljs solceller ofta bort under byggprocessens gång? I en mindre enkätstudie riktad till bostadsföretag och bostadsrättsföreningar som har fått solcellsstöd undersökte vi drivkrafter, incitament och hinder till att sätta solceller på flerbostadshusens tak i samband med en renovering. Studien är ett delprojekt i det nyligen avslutade E2B2 projektet ”Miljontak – Takrenovering med solceller”, en genomförbarhetsstudie som utgår från miljonprogrammets stora energieffektiviseringsutmaning med särskilt fokus på tak.
5.
Gluch, Pernilla, 1968, et al.
(författare)
Charting corporate greening: environmental management trends in Sweden
2014
Ingår i: Building Research and Information. - : Informa UK Limited. - 1466-4321 .- 0961-3218. ; 42:3, s. 318-329
Tidskriftsartikel (refereegranskat) abstract
In order to understand the long-term change processes, a longitudinal study of the Swedish construction industry is presented. This examines the long-term environmental attitudes and practices within this industry, particularly the trends and significant changes in corporate environmental management and performance. The results from three surveys undertaken in 2002, 2006 and 2010 indicate that environmental work is becoming institutionalized as astrategic part of the companies’ business, environmental management activities and integrated within the companies’ work practices. Also evident is a greater maturity and raised ambitions in companies’ environmental actions. Legislative pressures have become a reduced driver; instead there is increased pressure from, and need for cooperation with, a larger variety of stakeholders and across disciplines. Environmental management systems have been widely adopted, meaning that practice relies on self-surveillance and voluntary actions. A consolidation of environmental management is observed within the companies, as well as an emerging business niche of environmental expert consultancy. The perceived effects on competitiveness and financial performance remain unclear, implying that there are other motivations for environmental change than financial and legal justifications.
6.
Gluch, Pernilla, 1968, et al.
(författare)
Corporate environmental strategies and performance: A longitudinal study
2013
Ingår i: Proceedings 29th Annual ARCOM Conference, 2-4 September 2013, Reading, UK. - 9780955239076 ; , s. 1197-1207
Konferensbidrag (refereegranskat) abstract
This paper focus on four environmental strategy aspects: 1) stakeholder relations, 2) management systems, 3) environmental staff, roles and responsibilities and 4) integration of environmental work. The paper aims to identify trends related to these four aspects and explores the relationship between them and environmental and business performance. The paper is based on a longitudinal and cross-sectional empirical study covering all Swedish construction companies with at least 50 employees (for architects 20 employees). Questionnaire surveys covering environmental attitudes, management practices and performance was carried out in 2002, 2006 and 2010. Respondents were environmental manager/officers in each company. Response rates for the three surveys were between 41-45%. The results show that the environmental work is on its way to be institutionalized as a strategic part of the companies. Environmental staff is increasing and environmental managers are part of top management and often also members of the management board. We can also see that communication and cooperation with stakeholders is getting more intensified and more diverse. So is the use of EMS as driver for a more active environmental work. It is concluded that a key to successful environmental and business performance is that environmental work is integrated with a variety of other corporate business areas/issues.
7.
Mangold, Mikael, et al.
(författare)
Socio-economic impact of renovation and energy retrofitting of the Gothenburg building stock
2016
Ingår i: Energy and Buildings. - : Elsevier Ltd. - 0378-7788 .- 1872-6178. ; 123, s. 41-49
Tidskriftsartikel (refereegranskat) abstract
The European building stock was renewed at a rapid pace during the period 1950-1975. In many European countries the building stock from this time needs to be renovated. There is an opportunity to introduce energy efficiency measures in the renovation process, but in this process social aspects should also be taken into account. The purpose of this article is to provide an estimate of the economic and societal challenge of renovating and energy retrofitting the aging building stock. Building specific data on energy usage and previous renovation investments made in the multi-family dwellings in Gothenburg (N = 5 098) is aligned with data on tenure type and average income. Based on conducted energy retrofitting projects, costs are estimated for renovating and energy retrofitting multi-family dwellings that will reach the service life of 50 years before 2026. It is found that the pace of renovation needs to increase and that there is risk of increasing societal inequity due to rent increases in renovated buildings. © 2016 The Authors.
8.
Österbring, Magnus, 1986, et al.
(författare)
Renovation Needs and Potential for Improved Energy Performance Depending on Ownership – A Location Based Study of Multi-Family Building Stocks in an Urban Context
2017
Ingår i: Proceedings of the World Sustainable Built Environment Conference 2017, Hong kong 5-7th June. ; , s. 696-701
Konferensbidrag (refereegranskat) abstract
The transformation of urban building-stocks is fundamental to achieve climate change mitigation targets. As therate of renewal of the building-stock is low, energy efficiency measures need to be applied when renovation isbeing done. To evaluate the renovation potential of the existing building stock on an urban level, a local approachis needed to understand challenges and possibilities associated with its transformation. The aim of this study is toinvestigate the renovation needs and potentials for implementation of energy efficiency measures in relation toowner and type of ownership for the buildings. For this purpose, available databases containing building-specificinformation have been gathered and processed for the multi-family building stock of the city of Gothenburg,Sweden. These data sources are used to describe the energy performance of the stock and future renovationneeds based on type of property ownership while considering the location and context of the buildings usinggeographic information systems. Building attributes such as year of construction, value year, property owner,geometric data and energy performance certificates are spatially linked and visualized to describe the energyperformance of buildings and its relation to renovation need, providing detailed and valuable information to propertyowners. Buildings from the period 1960 - 1975 are of particular importance as they constitute 42% of the multifamilybuilding stock, have the highest average energy use (146 kWh/m2/year) and have to a large extent not beenrenovated. The municipality’s housing company own 36 % of the total stock and even more so considering buildingsfrom this period. While there will be a significant challenge in renovating their stock, this also presents anopportunity for large reductions in energy use. By incorporating building-specific information and considering thebuilding in its local setting, a more holistic and realistic view on energy saving potentials can be achieved. Theresults aim to support owners of larger property portfolios in prioritizing buildings suitable for renovation.
9.
Jerome, Adeline, 1994, et al.
(författare)
Exploring the Relationship between Environmental and Economic Payback Times, and Heritage Values in an Energy Renovation of a Multi-Residential Pre-War Building
2021
Ingår i: Heritage. - : MDPI AG. - 2571-9408. ; 4:4, s. 3652-3675
Tidskriftsartikel (refereegranskat) abstract
Cultural value and heritage have been identified as necessary for a sustainable living environment, alongside environmental concern and energy efficiency. In this study, multiple methods, i.e., life cycle assessment, payback, and questionnaires and interviews with tenants, and empirical data from a recent energy renovation of a multi-residential pre-war building with wooden construction were used to analyse the impact of the renovation on cultural and aesthetic values, environmental impact, financial payback time, and user satisfaction. In the energy renovation, the façade, which had been disfigured in an earlier renovation, was recreated to resemble the original architecture. The main questions are: What impact has the recreation of the façade on the environmental payback time in comparison to a more conventional renovation? What are the consequences for the user satisfaction and financial return on investment? The results show that the recreated façade has improved the building’s aesthetics without compromising the environmental benefits. It also resulted in better thermal comfort, which is highly valued by the tenants. The improved aesthetics are also appreciated by the tenants, but to a lesser extent. Financially, the renovation is estimated to be not viable. Results of this study can be applied in the decision-making of similar renovation projects
10.
Somanath, Sanjay, 1994, et al.
(författare)
AI-baserad segementering av fasader för att optimera renovering i en större skala
2021
Ingår i: Bygg och teknik. - 0281-658X. ; 2021:2, s. 26-29
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt) abstract
Hur kan vi på ett automatiskt sätt skapa mer detaljerade 3D modeller av byggnader i digitala tvillingar och förbättra indata för att beräkna energibesparingspotentialer i befintliga byggnader? I en pilotstudie har vi undersökt hur maskininlärning kan användas för att extrahera information om fönstersättning och storlek i befintliga byggnader. Vi har utvecklat en modell som har “tränats” att känna igen och segmenterar fönster från bilder med byggnadsfasader och på så sätt skapa digitala och mer detaljerade data för befintliga byggnader. Vårt långsiktiga mål är att utveckla en helautomatisk metod för analyser av renoveringspotentialer för byggnader och fastighetsportföljer.
