551 research outputs found
<b>Supplemental Material - Modular personalized climatization testing infrastructure with smartphone-based user feedback</b>
No full textSupplemental Material for Modular personalized climatization testing infrastructure with smartphone-based user feedback by Henning Metzmacher, Marc Syndicus, Alexander Warthmann, Jérôme Frisch and Christoph van Treeck in Building Services Engineering Research and Technology</p
An Kopf und Fuß angenehme Turbulenzen, Klimatisierung: Superrechner erlaubt erstmals Strömungssimulation in Echtzeit
No full textHeißer Kopf, kalte Füße. Der Dummy in der Flugzeugkabine schwitzt und friert gleichzeitig. Aus den Belüftungsdüsen strömt viel zu warme Luft direkt in sein Gesicht. Dafür herrscht an seinen Füßen Eiszeit, deshalb auch die warmen Socken. "Die Klimatisierung von Innenräumen ist eine Kunst für sich", sagt Dr. Christoph van Treeck von der TU München
A gap-filling method for room temperature data based on autoencoder neural networks
No full textThis study explores the applicability of a deep learning-based approach for reconstructing missing room temperature data from different domains where relatively few training samples are available. For that purpose, the existing convolutional, long short-term memory (LSTM) and feed-forward autoencoders were combined with a suitable domain adaptation procedure. Eventually, the developed models were evaluated on data collected in four buildings with significant differences in thermal mass, design and location. The findings pointed out that the domain adaptation can be conducted effciently by using a small data sample from the target domain. Additionally, the results showed that the proposed model can reconstruct up to 80 % of the missing daily room temperature inputs with RMSE accuracy of 0.6 °C
Argumente gegen die Reform des Stabilitätsgesetzes wenig überzeugend — eine Replik
No full textIn der Dezemberausgabe 2015 veröffentlichte der Wirtschaftsdienst einen Aufsatz zur Überprüfung des Stabilitäts- und Wachstumsgesetzes (StabG) von Henrike Michaelis, Steffen Elstner und Christoph M. Schmidt. Dazu erscheinen diese Replik und eine Erwiderung der Autoren.In their reply, Dullien and van Treeck criticise the argument of Michaelis, Elstner and Schmidt that the German Stability and Growth law (StabG) from the 1960s must not be reformed. They claim that Michaelis et al. neglect that the concept of sustainability has changed over the past 50 years and that nowadays issues such as social and ecological sustainability should be included. Moreover, the claim by Michaelis et al. that the StabG provides important tools for business cycle management is hardly convincing, given that these tools have not been used since the 1970s and stimulus packages have been passed on other legal grounds. / In their response Michaelis et al. stress that economic policy has to consider equally aspects of economic, social and ecological sustainability. The StabG, however, is a completely inappropriate basis for attempts to address aspects of social and ecological sustainability. The main use of the StabG consists in the possibility to quickly implement fiscal measures that could mitigate the consequences of severe economic downturns. Proposals of Dullien and van Treeck that various dimensions of sustainability are controllable by a predetermined set of instruments neglect the complexity of the social market economy
Daylighting driven design: Optimizing Kaleidocycle façade for hot arid climate
No full textFacade design has significant impact on daylight. This paper presents a facade based on origami: kaleidocycle rings that can be morphed enhancing daylight performance in residential spaces, which complies with both LEED V4 and Daylight availability. Daylighting analysis was integrated using Grasshopper, Diva and Genetic optimization for a south-oriented living room facade in Cairo, Egypt, through two phases. First phase dealt with base cases of specific typology. Second phase was conducted using parametric optimization process. Results demonstrate that Kaleidocycle rings of 30 cm size and 64 rotation’s angle reached results that exceed LEED v4 requirements while passing Daylight availability standards
Case Study for Energy Efficiency Measures of Buildings on an Urban Scale
No full textThe energy efficiency of existing buildings is one of the challenges launched by the EPBD recast. The RWTH Aachen University accepted this challenge and started the project EnEff: Campus - Roadmap aiming at reducing the specific primary energy consumption of the university campus building stock (about 300 buildings) by 50 % until 2025. For the estimation of refurbishments for this kind of big data, data mining techniques can be used like the CART method (Classification and Regression Tree). In this investigation, the method applied on the RWTH Aachen buildings stock and the estimated results will be compared to results from a simple data mining technique, called visual method. The comparison is performed by using low-order dynamic building model (LOM) performance simulation through the Modelica AixLib. The determined results of the recommendation of the CART method will be discussed and evaluated in this paper
Automatische Generierung von strukturellen as-built BIM Modellen auf der Basis von segmentierten Punktwolken
No full textPersonalized environmental comfort systems
No full textTraditional HVAC systems primarily condition the entire room air volume to achieve comfortable indoor conditions. In contrast, PECS operate locally, close to the user, improving the immediate microclimate. These systems respond more rapidly than traditional centralized HVAC and, by creating controlled microclimates, reduce the requirements placed on central HVAC, resulting in substantial energy-savings. Current standards for maintaining comfortable indoor conditions insufficiently address PECS. Underlying comfort models predominantly focus on global thermal comfort of the whole body under uniform indoor conditions, offering limited consideration of localized thermal effects. The equivalent temperature model in ISO 14505-2 (2007) is designed exclusively for non-contact areas and is therefore unsuitable for evaluating PECS operating in contact areas, such as seat heating and seat ventilation. The presented equivalent contact temperature model addresses this gap in comfort modeling by explicitly considering heat transfer processes in contact areas. The equivalent contact temperature is calculated to ensure that cumulative heat transfer between skin and contact area is identical in both real and equivalent environment. Complementing the equivalent temperature model, it has been tested under summer conditions with seat ventilation and winter conditions with seat heating. Derived comfort schemes provide a framework for interpreting equivalent contact temperature values. When integrated into a control framework, this model enables a comfort-driven control of PECS, making it a vital foundation for advancing PECS. Local PECS have predominantly been investigated under laboratory conditions, where simplified assumptions limit the transferability of results to real-world scenarios. A field study on a user-controlled PECS, including seat heating, under-desk heating plate, and on-desk heating plate, has demonstrated its acceptance as compensatory solution in cold office environments. The participants accepted the cold thermal conditions and frequently used the system to enhance their individual comfort. At the same time, the findings emphasize the need for additional modules, such as foot heating, to further enhance individual comfort. They also highlight that comfort-driven control should account for individual preferences
Structural Analysis based on the Product Model Standard IFC
No full textIn this paper we present a computer aided method supporting co-operation between different project partners, such as architects and engineers, on the basis of strictly three-dimensional models. The center of our software architecture is a product model, described by the Industry Foundation Classes (IFC) of the International Alliance for Interoperability (IAI). From this a geometrical model is extracted and automatically transferred to a computational model serving as a basis for various simulation tasks. In this paper the focus is set on the advantage of the fully three-dimensional structural analysis performed by p-version of the finite element analysis. Other simulation methods are discussed in a separate contribution of this Volume (Treeck 2004). The validity of this approach will be shown in a complex example
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