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Petter Wallentén
Department of Building Physics, Lund University, 221 00 Lund, Sweden

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Journal article
Published: 12 May 2021 in Sustainability
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The renovation of buildings involves multidisciplinary issues and multistakeholder involvement, which makes the process complex to manage. The purpose of this paper is to present a transparent, openly accessible, adaptable framework to ensure a sustainable renovation process, covering the technical, environmental, economic, social, and cultural historical aspects to be considered by the various actors during the renovation process. A framework with an associated process was drawn up, focusing on practical usefulness together with the fundamental idea that sustainability cannot be a sub requirement but must be the overall requirement present in all stages of the process. The framework contains an overview, description of activities, links to external tools and documents, and finally a checklist to be completed after each stage. Depending on which stakeholder uses the framework, there are different examples and suggestions for activities and tools. Contrary to many other assessment schemes, the SIRen process focuses on the renovation process itself, and the self-evaluation gives a numerical value that represents to what extent the actors have considered and implemented different aspects of sustainability in the stages of the renovation process. The SIRen process was partially implemented in four renovation projects during the iterative development of the SIRen framework.

ACS Style

Petter Wallentén; Kristina Mjörnell. SIRen: An Applied Framework for a Sustainable Renovation Process. Sustainability 2021, 13, 5412 .

AMA Style

Petter Wallentén, Kristina Mjörnell. SIRen: An Applied Framework for a Sustainable Renovation Process. Sustainability. 2021; 13 (10):5412.

Chicago/Turabian Style

Petter Wallentén; Kristina Mjörnell. 2021. "SIRen: An Applied Framework for a Sustainable Renovation Process." Sustainability 13, no. 10: 5412.

Conference paper
Published: 30 June 2020 in E3S Web of Conferences
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Based on measurements of mould in 17 attics in the north of Sweden, 3 were chosen as a tentative validation of the MRD-model (Mould Resistance Design) for long periods of time (1961-2012). Comparing the measurements and the results from the simulations showed great differences regarding the mould growth depending on the simplifications used in the model. How the leakage was simulated and where the moisture from the leakage was placed in the construction were the most important factors. The study could not validate the MRD model as such, but it was clear that the simulations with relatively small adjustments could give realistic data

ACS Style

Thor Hansen; Petter Wallentén. Investigation of the Mould Resistance Design (MRD) model for mould growth in attics. E3S Web of Conferences 2020, 172, 20005 .

AMA Style

Thor Hansen, Petter Wallentén. Investigation of the Mould Resistance Design (MRD) model for mould growth in attics. E3S Web of Conferences. 2020; 172 ():20005.

Chicago/Turabian Style

Thor Hansen; Petter Wallentén. 2020. "Investigation of the Mould Resistance Design (MRD) model for mould growth in attics." E3S Web of Conferences 172, no. : 20005.

Conference paper
Published: 30 June 2020 in E3S Web of Conferences
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Cold ventilated attics often have mould problems in Sweden. This is valid both for old and sometimes newly built attics. Increased insulation on the attic floor is assumed to increase the problem. To investigate this, numerical 1D models like WUFI or WUFI+ are typically used. These models give results but the physical processes are not so transparent for the user due to the complex numerical techniques involved and takes a long time to simulate. The problem is mainly related to the temperature in the attic, the ventilation rate and possible of leaks from the living space. All exposed surfaces in the attic will buffer moisture variations. But if this buffering is neglected and the leakage is treated as a constant the moisture content in the attic is only dependent on the ventilation with outside air and the assumed leakage. This would make a pure thermal investigation meaningful. An analytical model for the thermal problem was developed that took into account radiation between the interior surfaces and the different boundary conditions at the outside and inside surfaces. Using this model a parameter study of exterior roofing insulation was done using a moisture transport model that only took into account convection exchange. The results were compared with WUFI Pro and WUFI+ simulations which included the moisture exchange between air and internal surfaces. The comparison showed that the pure thermal model gave, as expected, larger variations in relative humidity, but that the results were qualitatively very similar. This indicates that analytical solutions of thermal problems can be used as a base in qualitative investigations of certain combined heat and moisture problems.

ACS Style

Johan Claesson; Petter Wallentén. Benefits of Investigating the Thermal Component for Moisture Safety in Ventilated Attics. E3S Web of Conferences 2020, 172, 23001 .

AMA Style

Johan Claesson, Petter Wallentén. Benefits of Investigating the Thermal Component for Moisture Safety in Ventilated Attics. E3S Web of Conferences. 2020; 172 ():23001.

Chicago/Turabian Style

Johan Claesson; Petter Wallentén. 2020. "Benefits of Investigating the Thermal Component for Moisture Safety in Ventilated Attics." E3S Web of Conferences 172, no. : 23001.

Journal article
Published: 14 October 2019 in International Journal of Building Pathology and Adaptation
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Purpose The purpose of this paper is to identify appropriate concepts of multi-active façades for the renovation of multifamily buildings in Sweden and to determine which, if any, are financially viable. Design/methodology/approach A lifecycle profit (LCP) analysis was used to examine financial viability through a ten-step process, which included identifying concepts, assessing costs and prices, calculating the LCP and performing sensitivity analysis. Two existing buildings – one low rise and the other high rise – were used as reference models. Findings The findings were contradictory. Implementing any of the multi-active façade concepts on the high-rise building would be financially beneficial. The opposite was, however, the case for the low-rise building. Two factors causing this contradiction have been identified: the façade material before renovation and the size of the building. Research limitations/implications The study is limited to two case buildings situated in Sweden; however, similar buildings represent a significant amount of the existing building stock. Part of the purpose of the study is also to investigate the merits of LCP analysis to evaluate energy-efficient retrofitting. The study implicates the benefits and pitfalls of LCP analysis needed to be considered by researchers and practitioners alike. Originality/value The research findings contribute to the understanding of energy-efficient retrofitting of existing multifamily buildings based on prefabricated multi-active façade concepts.

ACS Style

Rikard Sundling; Stefan Olander; Petter Wallentén; Stephen Burke; Ricardo Bernardo; Åke Blomsterberg. Lifecycle profit analysis of prefabricated multi-active façades. International Journal of Building Pathology and Adaptation 2019, 37, 565 -578.

AMA Style

Rikard Sundling, Stefan Olander, Petter Wallentén, Stephen Burke, Ricardo Bernardo, Åke Blomsterberg. Lifecycle profit analysis of prefabricated multi-active façades. International Journal of Building Pathology and Adaptation. 2019; 37 (5):565-578.

Chicago/Turabian Style

Rikard Sundling; Stefan Olander; Petter Wallentén; Stephen Burke; Ricardo Bernardo; Åke Blomsterberg. 2019. "Lifecycle profit analysis of prefabricated multi-active façades." International Journal of Building Pathology and Adaptation 37, no. 5: 565-578.

Conference paper
Published: 01 January 2018 in Healthy, Intelligent and Resilient Buildings and Urban Environments
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ACS Style

Johan Claesson; Petter Wallentén. A Dynamic Thermal Network Model Applied to Ventilated Attics. Healthy, Intelligent and Resilient Buildings and Urban Environments 2018, 1 .

AMA Style

Johan Claesson, Petter Wallentén. A Dynamic Thermal Network Model Applied to Ventilated Attics. Healthy, Intelligent and Resilient Buildings and Urban Environments. 2018; ():1.

Chicago/Turabian Style

Johan Claesson; Petter Wallentén. 2018. "A Dynamic Thermal Network Model Applied to Ventilated Attics." Healthy, Intelligent and Resilient Buildings and Urban Environments , no. : 1.