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Povzetek: As we spend more than 90% of our time inside buildings, indoor environmental quality is a major concern for healthy living. Recent studies show that almost 80% of people in European countries and the United States suffer from SBS (Sick Building Syndrome), which affects physical health, productivity and psychological well-being. In this context, environmental quality monitoring provides stakeholders with crucial information about indoor living conditions, thus facilitating building management along its lifecycle, from design, construction and commissioning to usage, maintenance and end-of-life. However, currently available modelling tools for building management remain limited to static models and lack integration capacities to efficiently exploit environmental quality monitoring data. In order to overcome these limitations, we designed and implemented a generic software architecture that relies on accessible Building Information Model (BIM) attributes to add a dynamic layer that integrates environmental quality data coming from deployed sensors. Merging sensor data with BIM allows creation of a digital twin for the monitored building where live information about environmental quality enables evaluation through numerical simulation. Our solution allows accessing and displaying live sensor data, thus providing advanced functionality to the end-user and other systems in the building. In order to preserve genericity and separation of concerns, our solution stores sensor data in a separate database available through an application programming interface (API), which decouples BIM models from sensor data. Our proof-of-concept experiments were conducted with a cultural heritage building located in Bled, Slovenia. We demonstrated that it is possible to display live information regarding environmental quality (temperature, relative humidity, CO2, particle matter, light) using Revit as an example, thus enabling end-users to follow the conditions of their living environment and take appropriate measures to improve its quality
Ključne besede: Building Information Model, internet of things, environmental quality monitoring, healthy living
Objavljeno v DiRROS: 19.01.2024; Ogledov: 179; Prenosov: 81
Celotno besedilo (18,89 MB)
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Povzetek: This research study presents a heat transfer model aimed at estimating the thermal and physical response of intumescent coatings. The numerical model is inspired by the outcomes of an experimental study focused on analysing the insulating effectiveness of a commercial intumescent coating for a range of heating conditions and initial coating thickness. The model solves the one-dimensional heat conduction problem using the finite-difference Crank-Nicolson method, and it assumes that the effectiveness of intumescent coatings is mainly dependent on their ability to develop swelled porous char. The coating swelling is implemented in the model by adopting an approach based on expanding the mesh representing the physical domain in proximity to the substrate-coating interface. The model described herein offers researchers and engineers a tool to estimate the heat transfer of swelling intumescent coatings (i.e. in-depth thermal gradient). Outcomes of the analysis shown herein demonstrate that the heat conduction within intumescent coatings is governed by the physical coating swelling and the thermal conditions at the coating-substrate interface. The numerical model shows that its accuracy is highly influenced by the coating thickness ahead of the reaction zone. Consequently, the coating swelling rate plays a key role, while the thermo-physical properties of the intumescent coating have a secondary effect. According to its assumptions, the model defines a quasi-steady-state thermal problem: it is more accurate for conditions close to steady-state (e.g. high heat fluxes), but it loses accuracy for cases characterised by transient phenomena (e.g. phases prior to the onset of swelling and low heat fluxes).
Ključne besede: intumescent coatings, heat transfer, numerical model, swelling, fire safety
Objavljeno v DiRROS: 08.01.2024; Ogledov: 166; Prenosov: 32
Celotno besedilo (1,21 MB)
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Povzetek: Pod vplivi prometnih obremenitev in okoljskih vplivov se kakovost vozišč stalno slabša. Z uporabo modificiranega švicarskega indeksa MSI lahko ocenimo in spremljajmo staranje vozišča, sposobnost zagotavljanja njegove funkcije pa lahko opredelimo z izgubo uporabnosti vozišča. Prispevek podaja predlog nove modelne funkcije za opredelitev staranja vozišča oziroma njegove izgube uporabnosti na osnovi vizualne ocene stanja vozišča (MSI) in določitev njegove navidezne starosti glede na predlagani model staranja vozišč.
Ključne besede: vozišče, ocena stanja, MSI, model
Objavljeno v DiRROS: 04.12.2023; Ogledov: 162; Prenosov: 94
Celotno besedilo (1,39 MB)
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Ključne besede: potencialna razširjenost, navadna bukev, prognoza, napoved, model
Objavljeno v DiRROS: 03.11.2023; Ogledov: 356; Prenosov: 93
Celotno besedilo (4,18 MB)

Ključne besede: suša, osutost bukove krošnje, vodni primanjkljaj, model, napoved
Objavljeno v DiRROS: 03.11.2023; Ogledov: 355; Prenosov: 72
Celotno besedilo (600,36 KB)