Lars Oliver Grobe


Last Name

Grobe

First Name

Lars Oliver

ORCID

0000-0001-8152-5762

Organisational unit

03902 - Schlüter, Arno / Schlüter, Arno

Search Results

Publications 1 - 10 of 76
  • Irregular light scattering properties of innovative fenestration for comfortable and energy-efficient buildings
    Item type: Conference Paper
    Grobe, Lars Oliver (2020)
    Proceedings of the International Symposium Architecture, Technology Innovation (ATI 2020): "Smart Buildings, Smart Cities"
    The irregular reflection and transmission properties of innovative fenestration components allow to redirect, and to selectively admit or block solar irradiation based on its incident direction. Compared to e.g. systems that implement adaptivity to external conditions by mechanical transformations, such tailored light scattering properties promise to reduce the complexity of installation, operation and maintenance as well as the impact on outward view and the aesthetical appearance of buildings. Examples of such innovative fenestration techniques, e.g. light redirecting films and Venetian blinds featuring irregular reflection properties, are presented with their gonio-photometrically measured light scattering properties. Techniques to model such innovative, optically complex fenestration in building simulation software to support product development and planning are presented. The effects on daylight availability, glare and solar gains are demonstrated for exemplary cases. Preliminary results indicate the potential of such innovative fenestration technology to control and modulate rather than to block solar irradiation with minimal interventions in the design of buildings aiming at high performance in terms of comfort and energy efficiency.
  • Efficient simulation for visual comfort evaluations
    Item type: Journal Article
    Wasilewski, Stephen; Grobe, Lars Oliver; Wienold, Jan; et al. (2022)
    Energy and Buildings
    This paper provides a validation of a novel sampling, storage, and evaluation method named raytraverse that can quickly and accurately compute glare and visual comfort metrics including vertical illuminance (Ev ), Daylight Glare Probability (DGP), and Unified Glare Probability (UGP). The motivation is to provide a path towards understanding the spatial and temporal distribution of daylight conditions in an architectural space. Current spatial temporal simulation workflows are constrained by the trade-offs between simulation time, accuracy, generality, and storage requirements. Raytraverse provides a bridge between illuminance sensor calculations, which are fast to calculate but provide limited information, and highresolution image generation, which provide more information but have long simulation times. To make this bridging possible, it relies on a pair of strategies that yields both high accuracy and high information data. First, an iteratively guided sampling approach based on the discrete wavelet transformation greatly reduces the number of view rays submitted to the renderer. Second, rather than collecting returned values in a raster image or dense matrix, a spatial data structure is used to both sparsely store and re-weight the samples according to their effective solid angle, allowing for the direct integration of any view based lighting metric and the synthesis of interpretable high dynamic range images (HDRi). These strategies can be coupled with existing rendering and climate based daylight modeling (CBDM) methods. Through a comparison with high-quality reference simulations and a best practice CBDM method based on Radiance, the raytraverse methods are shown to significantly reduce the simulation time needed to accurately simulate saturation, contrast, and combined visual comfort metrics for a complete set of annual hourly sky conditions from a range of locations within an office floor plan. The stored simulation data can be quickly re-analyzed for different view directions, metrics or images, and sky conditions.
  • Daylight redirection for the tropics
    Item type: Presentation
    Grobe, Lars Oliver (2009)
  • Daylight scattering by late antique window glass from Ephesus – Reconstructing the distribution of daylight in lost architecture
    Item type: Conference Paper
    Grobe, Lars Oliver; Noback, Andreas; Lang, Franziska; et al. (2021)
    Proceedings of the International Conference on Cultural Heritage and New Technologies ~ Monumental Computations: Digital Archaeology of Large Urban and Underground Infrastructures
    Starting from the 1st century CE, the availability of window glass throughout the Roman empire fosters the utilization of daylight in architecture. Due to features intro duced by manufacturing, it affects the spatial distribution of daylight in buildings, and thereby the visual perception of architecture. Finds of window glass in the context of a mixed-use, residential house, located in a late-antique–medieval urban quarter in Ephe sus, ask for a sound understanding of these immaterial aspects of architecture on the perception and utilization of buildings. The reconstruction of the building’s illumination is challenging, since it has to replicate the effects of fenestration on admitted light, and therefore requires models of the light scattering by window glass. To prepare such a reconstruction attempt, two data-driven modelling techniques are evaluated. One is based on the direct characterization of light scattering by gonio-photometric measure ments. The other technique employs ray-tracing on geometric surface models of the glass micro-structures, acquired by confocal microscopy, to derive effects on light scat tering. The exemplary application of the techniques to an exemplary glass fragment from the site provides two models of the sample’s scattering properties, including effects of corrosion and other alteration mechanisms. Both modelling techniques achieve qualita tive accordance and demonstrate the applicability of the resulting models in daylight sim ulation. Quantitative differences between the two models indicate the importance to also account for effects by the glass volume and inclusions. The research lays the foundations for the planned modelling of glass based on replicated samples and processed finds, and shall ultimately lead to a plausible reconstruction of the building’s illumination in late antiquity.
  • Zonal reconstruction of daylighting in historic built environments: A workflow to model and evaluate light in spatial and temporal domains
    Item type: Journal Article
    Grobe, Lars Oliver; Noback, Andreas; Wasilewski, Stephen W.; et al. (2024)
    Heritage
    Computer simulation allows to study daylight conditions in the past that afforded activities in antique buildings. The Python module phos4dtools implements the efficient computation of zonal daylight metrics that are considered to indicate affordances. It was employed to solve horizontal and vertical illuminance for different orientations and elevations in the House of the Priestesses, a unit of the Hadrianic Garden Houses complex in Ostia. A reconstruction model of the unit was produced by collating an existing, detailed 3D documentation with other sources and our own survey data. The spatially and temporally resolved results of daylight simulation employing phos4dtools were imported into a GIS database. Assuming typical reflectance properties, illuminance thresholds were determined that are required for the perception of contrast detail and colour differences. Integration over temporal periods and spatial zones that are eligible for residential activities was implemented by queries to the database. First, preliminary results indicated different distributions of affordances by daylight, depending on the characteristics of the considered visual tasks. Horizontal illuminance decreases quickly with increasing distance to the aperture, suggesting that activities bound to a horizontal work plane were constraint to the immediate adjacency of windows and potentially open doors. Vertical illuminance, on the other hand, reaches deep into the building when the receiving surface is oriented to a window, particularly in the absence of exterior obstructions. The exemplary application of phos4dtools shows its potential in the interdisciplinary research on daylight and its implications on living practice in antique buildings.
  • Views on ancient lighting
    Item type: Conference Paper
    Grobe, Lars Oliver; Noback, Andreas; Bielfeldt, Ruth; et al. (2025)
    CHNT Proceedings ~ Proceedings of the 26th International Conference on Cultural Heritage and New Technologies 2021
    Lighting is the practise of the deliberate, often combined, utilisation of daylight and other lighting devices to illuminate the human environment. Its effects can be reconstructed employing computational simulation from archaeological evidence, the findings of historical building research, and other sources. Methods of describing flames as the primary source of pre-modern artificial lighting in lighting simulation have to be developed. Exemplary lighting devices and research questions with regards to their interplay with their architectural contexts are discussed. The paper presents preliminary results and lines of thought emerging from the authors’ ongoing interdisciplinary research in lighting devices, lighting practice, and its effects on pre-modern architecture.
  • Hagia Sophia - Dealing with an extraordinary ancient building and complex materials
    Item type: Other Conference Item
    Grobe, Lars Oliver; Hauck, Oliver; Noback, Andreas; et al. (2008)
  • A novel data-driven BSDF model to assess the performance of a daylight redirecting ceiling panel at the Calgary Airport Expansion
    Item type: Conference Paper
    Grobe, Lars Oliver; Müllner, Katrin; Meyer, Björn (2015)
    Convention Proceedings, PLDC, 5th Global Lighting Design Convention
Publications 1 - 10 of 76