1. Planning for sufficiency shared housing : toward an agenda for future research and practiceRobert H. W. Boyer, Andrea Armstrong, Sabina Jordan, Agnieszka D. Hunka, Joana Wensing, Nancy Bocken, 2026, other scientific articles Abstract: In this critical commentary we propose a research agenda that supports the scaled development of “sufficiency shared housing,” or housing options built for the sharing of functional space in a way that lowers total resource consumption. While research from multiple contexts shows that shared housing options are generally popular, they remain niche market options, at best. Drawing from the specific cases of co-housing and co-living in North America and Europe, we argue that shared housing options will remain inaccessible, exploitative, and/or vulnerable to rebound effects without more structured guidance from the public sector in the form of planning, design guidelines, and revised building standards. We thus conclude by outlining a research agenda that supports proactive and positive guidance from the public sector by 1) testing and dispelling myths about shared housing being morally aberrant or unpopular, 2) offering specific design guidance, 3) testing and validating shared housing as a low-impact “sufficiency” option, and 4) scanning the emerging policy landscape.
Keywords: shared housing, sufficiency, co-housing, co-living
Published in DiRROS: 13.03.2026; Views: 252; Downloads: 146
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3. Evaluation of various retrofitting concepts of building envelope for offices equipped with large radiant ceiling panels by dynamic simulationsSabina Jordan, Jože Hafner, Tilmann E. Kuhn, Andraž Legat, Martina Zbašnik-Senegačnik, 2015, original scientific article Abstract: In order to achieve significant savings in energy and an improved level of thermal comfort in retrofitted existing buildings, specific retrofitting concepts that combine new technologies and design need to be developed and implemented. Large radiant surfaces systems are now among the most promising future technologies to be used both in retrofitted and in new low-energy buildings. These kinds of systems have been the topic of several studies dealing with thermal comfort and energy utilization, but some specific issues concerning their possible use in various concepts for retrofitting are still poorly understood. In the present paper, some results of dynamic simulations, with the transient system simulation tool (TRNSYS) model, of the retrofitted offices equipped with radiant ceiling panels are presented and thoroughly analysed. Based on a precise comparison of the results of these simulations with actual measurements in the offices, certain input data for the model were added, so that the model was consequently validated. The model was then applied to the evaluation of various concepts of building envelopes for office retrofitting. By means of dynamic simulations of indoor environment it was possible to determine the benefits and limitations of individual retrofitting concepts. Some specific parameters, which are relevant to these concepts, were also identified.
Keywords: radiant ceiling panels, heating, cooling, modelling, dynamic simulation, retrofitting concepts
Published in DiRROS: 05.09.2025; Views: 548; Downloads: 350
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4. Unutarnja okolina renoviranih ureda opremljenih stropnim isijavajućim pločamaSabina Jordan, Jože Hafner, Tilmann E. Kuhn, Andraž Legat, Martina Zbašnik-Senegačnik, 2016, original scientific article Abstract: U radu se ocjenjuje unutarnja okolina renoviranih ureda koji su, kao pokusni primjer,opremljeni naprednim stropnim isijavajućim pločama koje se primjenjuju za grijanje i hlađenje. Obavljene su opsežne analize na bazi raznih nizova stvarnih mjerenja kako bi se ocijenila djelotvornost i prikladnost predložene koncepcije za adaptiranje prostora. Ustanovljeno je da čitav sustav za temperiranje uredskih prostora funkcionira na prikladan način, te da raspon unutarnjih temperatura zraka omogućava postizanje najviše razine udobnosti.
Published in DiRROS: 16.09.2024; Views: 1180; Downloads: 786
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5. Roles of the reference service life (RSL) of buildings and the RSL of building components in the environmental impacts of buildingsTajda Potrč Obrecht, Roman Kunič, Sabina Jordan, Andraž Legat, 2019, published scientific conference contribution Abstract: The Life Cycle Assessment of a building is a complex analysis that also involves the use of the predicted Reference Service Life (RSL) of the building components and materials, as well as the predicted RSL of the whole building. The RSL values of individual materials and building components can be obtained from different sources and are not exactly comparable. In the present study, the influence of selected RLS values on an LCA assessment was evaluated. Three different RSL databases were used as the sources of the data to estimate the environmental impacts of selected building components (internal wooden door and external finishing coat). Two scenarios were presented. In the first scenario a building component can be reused in another building, while in the second scenario the reuse of the building component is not possible. The study showed that dependent on the selected RSL database, the results can differ by up to a factor of five. Therefore, it is very important to describe clearly the maintenance scenarios for a building in order to have a reliable comparison of the results of LCA assessments.
Keywords: reference service life, life cycle assessment, refurbishment
Published in DiRROS: 08.03.2024; Views: 1609; Downloads: 1143
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6. Difference between using tabulated and exact values of thermal properties of materials in numerical simulations of heat transfer through a high-performance windowMiha Jukić, Sabina Jordan, 2019, published scientific conference contribution Abstract: The thermal properties of materials, primarily the thermal conductivity, are an essential input for numerical modelling of heat transfer in buildings and building components. When determining them according to relevant European standards, it is not uncommon to encounter materials for which the exact values are not appropriately specified and the tabulated values in standards are overly conservative. In such situations, the thermal conductivity of the material can be determined by measurement. However, this approach may prove inconvenient and too expensive, especially if the material in question turns out to have little influence on the overall thermal performance of the product. It is, therefore, of great interest to know how the thermal performance is affected by choosing either the accurate (measured) or the conservative (tabulated) value of the thermal conductivity. In this work, the two approaches are compared in a practical example – a high-performance window, Jelovica Jelofuture – using numerical simulations. Our study shows that modifying the thermal properties of individual materials generally leaves the thermal transmittances of the frame (Uf) and the window (UW) almost unaffected. If all of the materials considered are modified simultaneously, Uf changes by 1–2% while the change in UW remains below 1%. However, due to their small values, the calculated changes of Uf and UW may be significantly affected (further increased or reduced) by the rounding of the results according to the relevant standards. In contrast, using the tabulated value of linear thermal transmittance (Ψg) of the junction with the glazing leads to an overestimation of UW by up to 15%.
Keywords: thermal transmittance, numerical simulation, conductivity, tabulated and exact values, practical example
Published in DiRROS: 08.03.2024; Views: 1410; Downloads: 956
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7. Development of an advanced methodology for assessing the environmental impacts of refurbishmentsTajda Potrč Obrecht, Sabina Jordan, Andraž Legat, Marcella Ruschi Mendes Saade, Alexander Passer, 2022, published scientific conference contribution Abstract: The refurbishment of the building stock is one of the key tasks for reducing the future environmental emissions in building sector. The assessment of the environmental impacts (EI) of refurbishments with LCA methodology remains a challenge. In the current practice, the refurbishment is threated as the beginning of the new lifecycle and all the impacts associated with the previous life cycle are generally neglected. The exclusion of materials and components used prior to the refurbishment produces a data gap at the end-of-life since information about materials that remained in the building after the refurbishment are missing. Furthermore, no information about what impacts have already been considered in the past bears the risk that some of the impacts are double-counted. In order to overcome these problems, an advanced methodology for the assessment of the embodied impacts in the case of refurbishment was developed that combines two sub-methodologies that can also be used separately. The first submethodology is used for remodelling the input data in order to make them time corresponding. The second sub-methodology is used for the assessment of the EI in the residual value of building materials and components and is including the allocation of EI between the life cycle before and after the refurbishment. The combination of the two sub-methodologies enables a more realistic and accurate assessment of the environmental impacts. The methodology is illustrated on the case on the case of a façade refurbishment. Five different allocation approaches are investigated and the residual value is calculated after a selected time period before and after the refurbishment. For all the inputs time-corresponding data is modelled and used. The study showed that for the life cycle before the refurbishment the EI and the residual value are generally higher if time-corresponding data is used since the EI of the electricity mix are higher. It turned out that the use of different allocation approaches is favouring either the use of recycled or reused materials or the recycling of the materials at the end. The PEF and the cut-off approach with module D are both enhancing the circular economy. It can be assumed that they are likely to prevail in the future.
Keywords: LCA, refurbishment, allocation, module D, dynamic LCA
Published in DiRROS: 31.01.2024; Views: 1646; Downloads: 883
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8. Construction materials for a sustainable future : proceedings of the 2nd International Conference CoMS 2020/212021, proceedings of peer-reviewed scientific conference contributions (international and foreign conferences) Abstract: Zbornik pokriva številne, predvsem tehnične teme, ki so pomembne za trajnostni razvoj gradbenega sektorja, kot ključnega dejavnika pri doseganju ciljev EU za obvladovanje podnebnih sprememb in za prehod v brezogljično družbo. Vsebinsko naslavlja inovacije v gradbenih materialih in tehnologijah, vključno s komponentami za zdravo in udobno bivanje, ter interakcije med materiali in okoljem. Poleg energetske učinkovitosti stavb je v njem zajeto področje širšega razumevanja trajnostnega načrtovanja, gradnje in vzdrževanja stavb ter monitoring, ocenjevanje in modeliranje stavb. Vključuje pa tudi vsebine, ki se nanašajo na krožno gospodarstvo, kot je recikliranje materialov in komponent ter koncepti sanacij stavb, ter na digitalizacijo in avtomatizacijo področja.
Keywords: trajnostno gradbeništvo, trajnostna gradnja, gradbeni materiali, tehnologije, energetska učinkovitost, zborniki, elektronske knjige
Published in DiRROS: 25.01.2024; Views: 2102; Downloads: 963
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