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Mr. Thomas Wüest
Lucerne University of Applied Sciences and Arts

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Research Keywords & Expertise

0 Building Physics
0 Facade
0 Modelica
0 Thermal Analysis
0 Thermal storage

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Journal article
Published: 30 June 2020 in Sustainability
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A novel façade element is presented that forms a symbiosis between an enhanced box-type window, a closed cavity façade, and a Trombe wall. This hybrid, transparent-opaque façade element features an absorbing water tank, that is installed behind a controlled shading device toward the cavity of a non-ventilated Double Skin Façade in the parapet section. To evaluate the potential impact on building performance, a transient simulation model is developed in Modelica and calibrated by comparison with measurements on a prototype. The effect of the absorbing thermal storage on heat transfers under solar radiation is analyzed in comparison to (i) conditions excluding solar radiation and (ii) an empty tank. An evaluation for four European cities demonstrates that the annual heating demand can be reduced by more than 4.2% and cooling demand by at least 6.6% compared to a façade without thermal storage. The effect is explained not only by the increased thermal mass, but also by the effective modulation of solar gains by the controlled absorbing storage. The dampening of heat flow fluctuations and the control of solar gains is a promising means to reduce the installed power of HVAC (heating/ventilating/air conditioning) installations.

ACS Style

Thomas Wüest; Lars Grobe; Andreas Luible. An Innovative Façade Element with Controlled Solar-Thermal Collector and Storage. Sustainability 2020, 12, 5281 .

AMA Style

Thomas Wüest, Lars Grobe, Andreas Luible. An Innovative Façade Element with Controlled Solar-Thermal Collector and Storage. Sustainability. 2020; 12 (13):5281.

Chicago/Turabian Style

Thomas Wüest; Lars Grobe; Andreas Luible. 2020. "An Innovative Façade Element with Controlled Solar-Thermal Collector and Storage." Sustainability 12, no. 13: 5281.

Journal article
Published: 25 September 2019 in Buildings
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The experimental setup implements a simplified PASSYS test cell construction, which is combined with a detailed simulation to reduce measurement effort. To analyze the cell’s dynamic behavior, the test cell was closely monitored with thermal sensors, and different static and dynamic heating modes were applied during a three-week calibration period. Co-heating tests were performed for steady-state measurements and cyclic heating periods account for the transient behavior of the test cell. The cells response was compared to the results of transient simulations with the software packet Modelica. The equation based Modelica framework allowed a detailed transient thermal simulation of the test cell’s dynamic to be set up that shows close agreement with the measurements. In addition, the flexibility of Modelica allowed unforeseen events affecting the experimental setup to be replicated, thereby ensuring an uninterrupted heat flow history of all surfaces. More than 96% of the predicted air temperatures (1 min resolution) match the experimental values within an error band of ±1.5 K, and 90% of all predictions are within ±1.0 K.

ACS Style

Thomas Wüest; Philipp Schuetz; Andreas Luible. Outdoor Test Cell Modelling with Modelica. Buildings 2019, 9, 209 .

AMA Style

Thomas Wüest, Philipp Schuetz, Andreas Luible. Outdoor Test Cell Modelling with Modelica. Buildings. 2019; 9 (10):209.

Chicago/Turabian Style

Thomas Wüest; Philipp Schuetz; Andreas Luible. 2019. "Outdoor Test Cell Modelling with Modelica." Buildings 9, no. 10: 209.

Review article
Published: 29 April 2019 in Journal of Building Engineering
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Adaptive facades are increasingly used in modern buildings, where they can take the form of complex systems and manifest their adaptivity in several ways. Adaptive envelopes must meet the requirements defined by structural considerations, which include structural safety, serviceability, durability, robustness and fire safety. For these novel skins, based on innovative design solutions, experimentation at the component and / or assembly level is required to prove that these requirements are fulfilled. The definition of appropriate metrics is hence also recommended. A more complex combination of material-related, kinematic, geometrical and mechanical aspects should in fact be properly taken into account, compared to traditional, static facades. Accordingly, specific experimental methods and regulations are required for these novel skins. As an outcome of the European COST Action TU1403 ‘Adaptive facades network’ - ‘Structural’ Task Group, this paper collects some recent examples and design concepts of adaptive systems, specifically including a new classification proposal and the definition of some possible metrics for their structural performance assessment. The aim is to provide a robust background and detailed state-of-the-art information for these novel structural systems, towards the development of standardised and reliable procedures for their mechanical and thermo-physical characterisation.

ACS Style

Chiara Bedon; Dániel Honfi; Klára V. Machalická; Martina Eliášová; Miroslav Vokáč; Marcin Kozłowski; Thomas Wüest; Filipe Santos; Natalie Williams Portal. Structural characterisation of adaptive facades in Europe – Part I: Insight on classification rules, performance metrics and design methods. Journal of Building Engineering 2019, 25, 100721 .

AMA Style

Chiara Bedon, Dániel Honfi, Klára V. Machalická, Martina Eliášová, Miroslav Vokáč, Marcin Kozłowski, Thomas Wüest, Filipe Santos, Natalie Williams Portal. Structural characterisation of adaptive facades in Europe – Part I: Insight on classification rules, performance metrics and design methods. Journal of Building Engineering. 2019; 25 ():100721.

Chicago/Turabian Style

Chiara Bedon; Dániel Honfi; Klára V. Machalická; Martina Eliášová; Miroslav Vokáč; Marcin Kozłowski; Thomas Wüest; Filipe Santos; Natalie Williams Portal. 2019. "Structural characterisation of adaptive facades in Europe – Part I: Insight on classification rules, performance metrics and design methods." Journal of Building Engineering 25, no. : 100721.

Journal article
Published: 08 July 2017 in Journal of Facade Design and Engineering
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ACS Style

Thomas Wüest; Andreas Luible. Increased thermal induced climatic load in insulated glass units. Journal of Facade Design and Engineering 2017, 4, 91 -113.

AMA Style

Thomas Wüest, Andreas Luible. Increased thermal induced climatic load in insulated glass units. Journal of Facade Design and Engineering. 2017; 4 (3-4):91-113.

Chicago/Turabian Style

Thomas Wüest; Andreas Luible. 2017. "Increased thermal induced climatic load in insulated glass units." Journal of Facade Design and Engineering 4, no. 3-4: 91-113.