TY  - THES
A1  - Kuhne, Michael
T1  - Modellierung des Energietransports durch Verglasungen
T1  - Modelling of the transport of energy through thermal glazings
N2  - Es werden sowohl analytische als auch numerische Verfahren zur Berechnung der Wärmeverluste von Verglasungen vorgestellt, wobei alle am Energietransport beteiligten Prozesse, die Wärmeleitung, die thermisch getriebenen Konvektionsströmungen und die infrarote Strahlungswechselwirkung, korrekt und vollständig berücksichtigt werden. Mit Hilfe numerischer Strömungssimulation werden Verglasungen systematisch hinsichtlich der Füllgasart, der Infrarotverspiegelung, der Einbaulage und des Scheibenabstandes sowie der Anzahl der Gaszwischenräume (Zwei-, Drei- und Vierscheiben-Verglasung) untersucht und verglichen. Die Abhängigkeit des k-Wertes von den Temperaturen der angrenzenden Klimate (Atmosphäre und Innenraum) wird dargestellt.
N2  - The aim of this work is to calculate the heat losses of thermal glazings. Conduction, radiation and convection are described in detail. Both analytical and numerical approaches are presented. Using a program for Computational Fluid Dynamics (CFD) thermal glazings are investigated systematically. The influence of IR-reflecting coatings, kind of gas-filling, pane distance and number of panes is studied. Furthermore a dependence of the u-value on the temperature difference between room and atmosphere is described for certain gas-fillings.
KW  - Verglasung
KW  - Wärmeverlust
KW  - Strömungsfeld
KW  - Temperaturfeld
KW  - Finite-Volumen-Methode
KW  - Transportgleichung
KW  - Wärmeübertragung
KW  - Energietransport
KW  - Konvektion
KW  - Leitung
KW  - Strahlung
KW  - k-Wert
KW  - transport of energy
KW  - thermal glazings
KW  - conduction
KW  - radiation
KW  - convection
Y1  - 1998
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20040220-458
ER  - 
TY  - CHAP
A1  - Flood, Ian
A1  - Issa, Raja
A1  - Abu-Shdid, Caesar
T1  - Developments in Hyper Real-Time Simulation of Transient Heat-Flow in Buildings
N2  - This paper reports on the latest results in the development of a new approach for simulating the thermal behavior of buildings that overcomes the limitations of conventional heat-transfer simulation methods such as FDM and FEM. The proposed technique uses a coarse-grain approach to model development whereby each element represents a complete building component such as a wall, internal space, or floor. The thermal behavior of each coarse-grain element is captured using empirical modeling techniques such as artificial neural networks (ANNs). The main advantages of the approach compared to conventional simulation methods are: (a) simplified model construction for the end-user; (b) simplified model reconfiguration; (c) significantly faster simulation runs (orders of magnitude faster for two and three-dimensional models); and (d) potentially more accurate results. The paper demonstrates the viability of the approach through a number of experiments with a model of a composite wall. The approach is shown to be able to sustain highly accurate longterm simulation runs, if the coarse-grain modeling elements are implemented as ANNs. In contrast, an implementation of the coarse-grain elements using a linear model is shown to function inaccurately and erratically. The paper concludes with an identification of on-going work and future areas for development of the technique.
KW  - Hochschulbildung
KW  - Entscheidungsunterstützung
KW  - Echtzeitverarbeitung
KW  - Konvektion
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-1961
ER  -