Publications of Guirec Ruellan
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See detailMethodology of a statistical analysis of the housing building stock in Belgium
Ruellan, Guirec ULiege

Poster (2018, May 30)

Belgium has to decrease the building sectors’ energy consumption by 80% in 2050. In order to reach this objective, all the studies carried out on this subject confirm the need to achieve a renovation rate ... [more ▼]

Belgium has to decrease the building sectors’ energy consumption by 80% in 2050. In order to reach this objective, all the studies carried out on this subject confirm the need to achieve a renovation rate of more than 3% per year. Some of those studies are trying to identify the best way to achieve this goal, but few studies are analysing and evaluating past policies effectiveness. Past studies identified some of criteria which are influencing this rate: including external factors such as energy prices and weather, and internal factors such as building energy regulation or inhabitants’ awareness. The studies showed the importance to take into account other changes such as inhabitant health, fuel poverty, the energy balance of the country and the building sector employment. The main aim of this study is to understand what leads to an improvement in the housing stock. This involves identifying several factors of influence (IFs) through the state of the art. In parallel, performance indicators (PIs) are selected, which will reflect the multifactorial aspects of the renovation problem. Finally, a statistical analysis reveals the influence of IFs on the evolution of PIs for the past 15 years. The results first highlight the importance of some social and economic factors on the evolution of the housing stock characteristics. They also allow prioritizing the actions to be undertaken as part of an overall strategy for the housing renovation. Thus, this study is aimed mainly at policy makers who will use the findings to adapt renovation strategies, and at researchers who will be able to use the results to help them in their analysis of the evolution of the built stock. [less ▲]

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See detailInterviews on Residential Building Stock Deep Renovation in Belgium
Ruellan, Guirec ULiege

Poster (2017, April 26)

Belgium should increase the deep renovation rate of existing residential building stock at least to 3% a year to achieve the EU objectives of decreasing by 80% the Green House Gas Emissions before 2050 ... [more ▼]

Belgium should increase the deep renovation rate of existing residential building stock at least to 3% a year to achieve the EU objectives of decreasing by 80% the Green House Gas Emissions before 2050. Since the first thermal legislations (between 1985 and 2000, depending on the Region), efficiency and comfort of newly built houses have met higher standards. But the renovation rate of residential buildings remained stable in the last 20 years. Only 25000 renovation permits are issued each year, in which a small amount of them are highly energy efficient. Literature review has showed that drivers and barriers of deep renovation are many and varied, sometimes contradictory and often underestimated. Conducted interviews with experts who study different facet of renovation present some others viewpoints on this subject. According to their own specific experience, each interviewee thinks differently on possible solutions. The poster set out the interview analysis. Some points are very close to the literature review, such as the environmental and economic issues of the residential renovation, while other results are solely extracted based on the interviews’ results. Amongst others, the necessity to maintain and improve the existing building stock to new standards takes an important place. The regulation appears to be a good driver as much as a barrier, depending on the local legislations and buildings context particularly in Belgium where the diversity of the building stock is very important. Public policies seem to be the first tools to unlock the renovation rate even if the development of new financial model and the information of stakeholders are also highlighted. This analysis increases the comprehension of the renovation topic on a new level, including some adjacent ideas that lead to better understanding of the existing barriers and possible strategies to overtake them, so that to involve everyone in the renovation strategy definition to promote the most efficient one. [less ▲]

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See detailInterviews sur la rénovation du stock bâti en Belgique
Ruellan, Guirec ULiege

Book published by Liège Université (2016)

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See detailEtat du marché de la rénovation du bâti résidentiel en Belgique
Ruellan, Guirec ULiege

Book published by SBD Lab (2016)

Pour atteindre les objectifs énergétiques de l’Union Européenne pour 2050, et plus largement les objectifs fixés à la dernière COP, le secteur de la construction et de l’habitat doit opérer sa mue vers un ... [more ▼]

Pour atteindre les objectifs énergétiques de l’Union Européenne pour 2050, et plus largement les objectifs fixés à la dernière COP, le secteur de la construction et de l’habitat doit opérer sa mue vers un modèle plus durable. En Belgique, pour des raisons historiques et culturelles, une large majorité du stock bâti est vieux et énergétiquement inefficace. Le bâtiment est entre autre responsable de 35% des émissions de gaz à effet de serre, majoritairement pour le chauffage des habitations. Les hautes performances des nouvelles constructions visant une cible passive, voir zéro énergie, ne suffiront pas à modifier le bilan global du stock bâti en raison de la faiblesse du rythme de renouvellement des bâtiments dans les pays d’Europe occidental. L’ensemble des études convergent d’ailleurs pour démontrer que la principale problématique en Belgique porte sur la rénovation et l’amélioration des performances des bâtiments déjà existants, premier gisement d’économie tant en terme de quantité que d’accessibilité. Mais au-delà du constat, il est aujourd’hui nécessaire de mettre en place les stratégies nécessaires à l’augmentation d’un taux de rénovation qui reste stable depuis des années en dépit des politiques déjà mises en place. La présente étude porte sur l’identification des différentes problématiques liées à la rénovation en Belgique et tente d’objectiver les barrières à une augmentation du taux de rénovation. L’objectif est de fournir une vue d’ensemble du secteur de la rénovation à l’heure actuelle, ainsi qu’une compréhension plus fine des mécanismes à l’œuvre et des raisons expliquant la faiblesse structurelle du taux de rénovation. Une attention particulière est portée sur l’état actuelle du marché de la rénovation, sur la durabilité d’une telle démarche de rénovation énergétique, sur son coût en lien direct avec le prix de l’énergie et les différents mécanismes de financement ainsi que sur l’importance de la communication et de l’information des différentes parties prenantes quant aux possibilités qui s’offrent à elles, ces différentes parties ayant été identifiés au cours de l’étude comme les principales barrières au développement d’une rénovation énergétique à grande échelle. L’identification de ces barrières est une première étape vers le développement de stratégies effectives d’augmentation de la qualité et de la quantité des rénovations mises en œuvre. Si la ville du futur est en grande partie déjà construite, encore faut-il mettre en place les conditions favorables à son amélioration pour répondre aux critères de demain. Pour se faire, cette étude se base sur une revue de littérature d’un échantillon représentatif des différentes études, projets de recherches et politiques Flamandes et Wallonnes portant sur la rénovation du stock bâti belge. Par la synthèse de l’ensemble des recherches menées sur le sujet, nous dégageons les problématiques majeures touchant à l’augmentation du taux de rénovation en Belgique. Ces résultats initiaux, présentés sous la forme d’une série de challenge, devront permettre ultérieurement la conduite des recherches approfondies visant à la modélisation des effets de plusieurs stratégies possibles d’augmentation du taux de rénovation, encourageant ainsi l’information et l’aide à la décision des différentes parties prenantes politiques, économiques, entrepreneuriales et universitaires liées à la question de la rénovation du stock bâti à travers l’ensemble du territoire belge. [less ▲]

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See detailLes problématiques de la rénovation du stock bâti dans la ville de demain : résultats d’une étude initiale en Belgique.
Ruellan, Guirec ULiege

in Recueil des articles des 34èmes Rencontres Universitaires de Génie Civil de l'AUGC (2016, May)

Pour atteindre les objectifs énergétiques de l’Union Européenne pour 2050, et plus largement les objectifs fixés à la dernière COP, le secteur de la construction et de l’habitat doit opérer sa mue vers un ... [more ▼]

Pour atteindre les objectifs énergétiques de l’Union Européenne pour 2050, et plus largement les objectifs fixés à la dernière COP, le secteur de la construction et de l’habitat doit opérer sa mue vers un modèle plus durable. En Belgique, cela passe par la rénovation et l’amélioration des performances du stock bâti existant. La présente étude porte sur l’identification des différents enjeux (environnementaux, économiques et sociaux) liées à la rénovation en Belgique et tente d’objectiver les barrières (de financement, de communication et de réglementation) à une augmentation du taux de rénovation, à travers une revue de littérature des différentes études et projets portant sur ce domaine en Belgique. Ces résultats initiaux devront permettre ultérieurement la conduite des recherches approfondies visant à la modélisation des effets de plusieurs stratégies possibles d’augmentation du taux de rénovation. [less ▲]

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See detailModelling of long-term deep renovation strategies for the Belgian building stock
Ruellan, Guirec ULiege

Poster (2016, April 28)

To achieve the EU energy targets for 2050, the construction sector has to perform major transformations. In Belgium, the majority of building stock is particularly old and energy inefficient. The high ... [more ▼]

To achieve the EU energy targets for 2050, the construction sector has to perform major transformations. In Belgium, the majority of building stock is particularly old and energy inefficient. The high performance of new constructions represented in the nearly zero energy buildings target is not sufficient to ensure the efficiency of the overall building sector. Therefore, it is crucial to put in place a progressive renovation policy. Despite the different renovation strategies and projects that took place in the recent year in Belgium, the overall renovation rate remains almost stable for the last ten years. This study focuses on the renovation market in Belgium and analyzes the factors that influence the evolution of the renovation rate. The objective is the identification and development of effective strategies bypass that leads to increased renovation rates in Belgium. The research methodology is based on an iterative process, based on a systematic literature review of Flemish and Walloon projects, publications and policy. These first work package will allow to identify factors influencing the renovation rate and in other hand to build a model of the existing building stock. Impacts of the influencing factors on the building stock are simulated in the fourth work package in order to propose an action plan in the last part. Three mains outcomes are expected: A model of the existing building stock in Belgium and its retrofit potential, a simulation of the effects of different strategies used to increase the renovation rate in Belgium and a theoretical action plan on strategies to increase the rate of renovation in Belgium. These results are necessary to inform and support the decision making of policy makers, municipalities and operational planning authorities across Belgium. [less ▲]

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See detailWood, the material of tomorrow's retrofits
Ruellan, Guirec ULiege; Attia, Shady ULiege

in High-quality retrofit and redensification with timber construction systems (2015, June 18)

The construction sector has focused for many years on performance improvement of new constructions. Today's largest problem is the energetic retrofitting of existing buildings. The building retrofit is an ... [more ▼]

The construction sector has focused for many years on performance improvement of new constructions. Today's largest problem is the energetic retrofitting of existing buildings. The building retrofit is an important strategy for energy savings. Building retrofit is addressed towards the real estate in Europe and allows for substantial gains, especially for heating houses and urban densification. However retrofit requires the use of special construction techniques. The problem is quite different from that of the new buildings: adaptation to existing building, heritage conservation, elimination of thermal bridges, etc. In this context, wood is experiencing strong growth in its use in new constructions, due to its qualities. And we think that some of those allow more appropriate responses to retrofit than other traditional materials. In this study, we will first present succinctly the problems related to the renovation, then we will dedicate ourselves to define the characteristics of the wood. The focus will be on some problems that commonly arise in wood constructions. We will then discuss a case, highlighting different characteristics of wood that are particularly important in this particular renovation. This allows us to observe on the ground the coherence of the choice of wood in the renovation. A discussion will close the study by summarizing the advantages and limitations of the use of wood in the renovation This is not to show that wood is one of the most environmentally friendly building materials, or demonstrate the sustainable character of retrofit. This is to see that the timber construction systems can provide an adequate response to many retrofit issues. [less ▲]

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