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Query: "author" (Katja Žagar) .

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1.
Turning a point cloud into a Building Information Model (BIM) : defining and validating the accuracy requirements for existing buildings
Katja Žagar, Laurens Jozef Nicolaas Oostwegel, Katja Malovrh Rebec, 2025, published scientific conference contribution

Abstract: Digitization of existing buildings is one of the main future goals, leading to efficient planning, renovation and maintenance. Among the existing buildings, a significant share is protected as a cultural heritage and their management is supervised because interventions on the protected sites are limited. Building information modeling (BIM) provides the opportunity to integrate accurate as-built information into the digital environment where it can easily be accessed and used. A digital representation of building creation usually starts with the acquisition of spatial data (point cloud), which is then used to create a semantically enriched model with certain geometric accuracy (BIM). In order for the model to serve its purpose, it is important to define how accurate the model should be. Since there are currently insufficient definitions of geometric requirementsfor specific BIM use cases, the research hypothesis was that the quality of BIM greatly depends on the modeler. The identified issue was approached with a study case. Using the point cloud of the existing building, the BIM was made and validated based on pre-defined accuracy requirements. Different accuracy validation methods were used in the process. Based on the results of the study case, conclusions and recommendations for efficient BIM creation were prepared.
Keywords: digitalization of existing buildings, point cloud, building information model, BIM, geometric accuracy
Published in DiRROS: 18.02.2025; Views: 898; Downloads: 490
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2.
Improved understanding of thermal comfort could yield energy savings in heritage buildings
Katja Žagar, Uroš Bohinc, Blaž Kurent, Katja Malovrh Rebec, 2024, published scientific conference contribution

Abstract: It is necessary to improve the understanding of thermal comfort to reduce energy consumption for heating and cooling in heritage buildings, which are often energy inefficient and where interventions are limited. Personal thermal comfort models based on measurements of environmental conditions and the individual's physiological and subjective responses represent a potential solution to ensure the optimization of existing systems. Past research shows that lighting could impact thermophysiology and subjective perception of thermal conditions, but it is not clear whether the impact is sufficient to make light adaptation an appropriate solution to reduce energy consumption in heritage buildings, where people live and work. The research conducted under realistic semi-controlled conditions in an office environment of an existing building addresses this research gap. The paper presents the first partial simplified analyses and preliminary results of a wider ongoing study, mainly showing a correlation between skin temperature and air temperature and a partially promising effect of light on subjective thermal perception. Our research on the effect of light on thermal comfort does not provide definitive conclusions but rather highlights the need for further investigation in actual heritage buildings.
Keywords: heritage buildings, minimal intervention renovation, thermal comfort, light
Published in DiRROS: 19.12.2024; Views: 873; Downloads: 496
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