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425. Scanning electron microscope images of isolates of small cellular particles Phaeodactylum tricornutum grown in media supplemented with Guillard’s (F/2) marine : marine water enrichment solution, BG11 broth and Lennox LB brothApolonija Bedina Zavec, Darja Božič, Matej Hočevar, Aleš Iglič, Marko Jeran, Veronika Kralj-Iglič, Anna Romolo, 2024, published scientific conference contribution Published in DiRROS: 08.03.2024; Views: 87; Downloads: 45
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427. 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: 121; Downloads: 96
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429. 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: 89; Downloads: 44
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430. Understanding carbide evolution and surface chemistry during deep cryogenic treatment in high-alloyed ferrous alloyPatricia Jovičević Klug, Levi Tegg, Matic Klug Jovičević, Rahul Parmar, Matteo Amati, Luca Gregoratti, László Almásy, Julie M. Cairney, Bojan Podgornik, 2023, original scientific article Keywords: cryogenic temperature, surface chemistry, microstructure, atom probe tomography (APT), scanning photoelectron microscopy (SPEM), small angle neutron scattering (SANS)
Published in DiRROS: 08.03.2024; Views: 90; Downloads: 89
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