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Author(s):	Peng, Zhenming; Carrigan, Svenja; Kornadt, Oliver
Title:	Local room-side heat transfer of an office room with different heating strategies
Abstract:	The room-side heat transfer of a building is essential for calculating and simulating heat loss through radiation and convection in interior spaces, and also for preventing mould growth and condensation. By means of Computational Fluid Dynamics (CFD) simulations, this study investigates the effect of floor heating, mixing ventilation, furniture, room geometry, and their combinations on the interior heat transfer coefficient (HTC) of a typical office room. The results show an inhomogeneous distribution of the HTC on the exterior walls. HTC values are generally below the German standardised value for thermal protection, which means an overestimation of the heat loss when the standardised value is applied. However, compared to the standardised value for preventing mould growth, the minimum surface-averaged HTC behind closets is 63 % lower, potentially leading to mould growth and condensation. Lokaler raumseitiger Wärmeübergang eines Büroraums mit unterschiedlichen Heizstrategien Der raumseitige Wärmeübergang eines Gebäudes ist nicht nur für die Berechnung und Simulation des Wärmeverlusts durch Strahlung und Konvektion in Innenräumen von wesentlicher Bedeutung, sondern auch zum Nachweis der Tauwasser- und Schimmelpilzfreiheit. Diese Studie untersucht anhand Computational Fluid Dynamics (CFD)-Simulationen die Auswirkungen von Fußbodenheizung, Mischlüftung, Möblierung, Raumgeometrie und deren Kombinationen auf den Wärmeübergangskoeffizienten (Heat Transfer Coefficient, HTC) eines typischen Büroraums. Die Ergebnisse zeigen eine inhomogene Verteilung des HTC an den Außenwänden. Die HTC-Werte liegen im Allgemeinen unter dem deutschen normativen Wert für den Wärmeschutz, was eine Überschätzung des Wärmeverlusts bei Anwendung des normativen Wertes bedeutet. Im Vergleich zum normativen Wert zur Verhinderung von Schimmelpilzbildung ist der minimale flächengemittelte HTC-Wert hinter einem Schrank um 63 % niedriger, was zu Schimmelpilzbildung und Tauwasserbildung führen kann.
Source:	Bauphysik 44 (2022), No. 6
Page/s:	317-322
Language of Publication:	German

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