TY  - CHAP
A1  - Wetter, Martin
A1  - Kern, Alexander
T1  - Number of lightning strikes to tall structures - comparison of calculations and measurements using a modern lightning monitoring system
T2  - 2014 International Conference on Lightning Protection (ICLP), Shanghai, China
Y1  - 2014
SP  - 1
EP  - 7
ER  - 
TY  - JOUR
A1  - Wettingfeld, Jürgen
A1  - Kern, Alexander
A1  - Krämer, Heinz-Josef
A1  - Thormählen, Reyno
T1  - International anerkannte Blitzschutznormen : Ausgewogener und sicherer Schutz
N2  - Die Einleitung zur Norm DIN EN 62305-3 beschreibt klar und ein - deutig: Der vorliegende Teil der IEC 62305 behandelt den Schutz von baulichen Anlagen gegen materielle Schäden und den Schutz von Personen gegen Verletzungen durch Berührungs- und Schrittspannungen. Als das wesentlichste und effektivste Mittel zum Schutz von baulichen Anlagen gegen materielle Schäden gilt das Blitz - schutzsystem (LPS).
KW  - Blitzschutz
KW  - lightning protection
Y1  - 2009
PB  - Fachhochschule Aachen
CY  - Aachen
ER  - 
TY  - CHAP
A1  - Wuttke, Claudia
A1  - Butenweg, Christoph
A1  - Rosin, Julia
A1  - Kubalski, Thomas
T1  - Verbesserte seismische Nachweiskonzepte für Mauerwerksbauten in deutschen Erdbebengebieten
T2  - Adam, Christoph (Hrsg.) ; Univ. Innsbruck: 16. D-A-CH Tagung Erdbebeningenieurwesen & Baudynamik 2019 : 26. und 27. September 2019, Innsbruck
Y1  - 2019
SN  - 978-3-200-06454-6
SP  - 713
EP  - 722
CY  - Innsbruck
ER  - 
TY  - BOOK
A1  - Wählisch, Georg
T1  - Technisches Zeichnen : Lösungsvorschläge für das Selbststudium. (Berichte aus dem Maschinenbau)
Y1  - 2012
SN  - 978-3-8440-1159-3
PB  - Shaker
CY  - Aachen
ER  - 
TY  - BOOK
A1  - Wählisch, Georg
T1  - Technisches Zeichnen : Vorlesung und Übungen
Y1  - 2009
SN  - 978-3-8322-8044-4
PB  - Shaker
CY  - Aachen
ER  - 
TY  - CHAP
A1  - Zahra, Mahdi
A1  - Phani Srujan, Merige
A1  - Caminos, Ricardo Alexander Chico
A1  - Schmitz, Pascal
A1  - Herrmann, Ulf
A1  - Teixeira Boura, Cristiano José
A1  - Schmitz, Mark
A1  - Gielen, Hans
A1  - Gedle, Yibekal
A1  - Dersch, Jürgen
T1  - Modeling the thermal behavior of solar salt in electrical resistance heaters for the application in PV-CSP hybrid power plants
T2  - SOLARPACES 2020
N2  - Concentrated Solar Power (CSP) systems are able to store energy cost-effectively in their integrated thermal energy storage (TES). By intelligently combining Photovoltaics (PV) systems with CSP, a further cost reduction of solar power plants is expected, as well as an increase in dispatchability and flexibility of power generation. PV-powered Resistance Heaters (RH) can be deployed to raise the temperature of the molten salt hot storage from 385 °C up to 565 °C in a Parabolic Trough Collector (PTC) plant. To avoid freezing and decomposition of molten salt, the temperature distribution in the electrical resistance heater is investigated in the present study. For this purpose, a RH has been modeled and CFD simulations have been performed. The simulation results show that the hottest regions occur on the electric rod surface behind the last baffle. A technical optimization was performed by adjusting three parameters: Shell-baffle clearance, electric rod-baffle clearance and number of baffles. After the technical optimization was carried out, the temperature difference between the maximum temperature and the average outlet temperature of the salt is within the acceptable limits, thus critical salt decomposition has been avoided. Additionally, the CFD simulations results were analyzed and compared with results obtained with a one-dimensional model in Modelica.
KW  - Solar thermal technologies
KW  - Hybrid energy system
KW  - Concentrated solar power
KW  - Energy storage
KW  - Photovoltaics
Y1  - 2022
SN  - 978-0-7354-4195-8
U6  - https://doi.org/10.1063/5.0086268
SN  - 1551-7616 (online)
SN  - 0094-243X (print)
N1  - SOLARPACES 2020: 26th International Conference on Concentrating Solar Power and Chemical Energy Systems, 28 September–2 October 2020, Freiburg, Germany
IS  - 2445 / 1
PB  - AIP conference proceedings / American Institute of Physics
CY  - Melville, NY
ER  - 
TY  - JOUR
A1  - Zatko, B.
A1  - Dubecký, F.
A1  - Bohacek, P.
A1  - Gombia, E.
A1  - Frigeri, P.
A1  - Mosca, R.
A1  - Franchi, S.
A1  - Huarn, J.
A1  - Nescas, V.
A1  - Sekacova, M.
A1  - Förster, Arnold
A1  - Kordos, P.
T1  - On the spectrometric performance limit of radiation detectors based on semi-insulating GaAs
JF  - Nuclear instruments and methods in physics research, Section A. 531 (2004), H. 1-2
Y1  - 2004
SN  - 0168-9002
SP  - 111
EP  - 120
ER  - 
TY  - CHAP
A1  - Ziegler, M.
A1  - Schüller, R.
A1  - Mottaghy, Darius
T1  - Numerical simulation of energy consumption of artificial ground freezing applications subject to water seepage
T1  - Simulation numérique de la consummation d´énergie des applications pour la congélation artificielle du sol soumise au flux de l´eau souterraine
T2  - Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
Y1  - 2013
SP  - 2985
EP  - 2988
ER  - 
TY  - CHAP
A1  - Zischank, Wolfgang J.
A1  - Heidler, Fridolin
A1  - Kern, Alexander
A1  - Metwally, I. A.
A1  - Wiesinger, J.
A1  - Seevers, M.
T1  - Laboratory simulation of direct lightning strokes to a modelled building - measurement of magnetic fields and induced voltages
N2  - In IEC 61312-2 equations for the assessment of the magnetic fields inside structures due to a direct lightning strike are given. These equations are based on computer simulations for shields consisting of a single-layer steel grid of a given mesh width. Real constructions, however, contain at least two layers of reinforcement steel grids. The objective of this study was to experimentally determine the additional shielding effectiveness of a second reinforcement layer compared to a single-layer grid. To this end, simulated structures were set up in the high current laboratory. The structures consisted of cubic cages of 2 m side length with one or with two reinforcement grids, respectively. The structures were exposed to direct lightning currents representing the variety of anticipated lightning current waveforms. The magnetic fields and their derivatives at several positions inside the structure as well as the voltage between “floor” and “roof” in the center were determined for different current injection points. From these data the improvement of the shielding caused by a second reinforcement layer is derived.
KW  - Direkter Blitzschlag
KW  - Elektromagnetischer Schutzschild
KW  - Magnetische Felder
KW  - Induzierte Spannungen
KW  - Stahlbetonkonstruktion
KW  - Lightning
KW  - electromagnetic shielding
KW  - magnetic field
KW  - reinforced concrete
KW  - induced voltage
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Zischank, Wolfgang J.
A1  - Heidler, Fridolin
A1  - Wiesinger, J.
A1  - Metwally, I.
A1  - Kern, Alexander
A1  - Seevers, M.
T1  - Laboratory simulation of direct lightning strokes to a modeled building : measurement of magnetic fields and included voltages
JF  - Journal of electrostatics. 60 (2004), H. 2 - 4
Y1  - 2004
SN  - 0304-3886
N1  - ISSN der E-Ausg.: 0304-3886
SP  - 223
EP  - 232
ER  -