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The Global ETD Search service is a free service for researchers
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Thermal room modelling adapted to the test of HVAC control systems / Thermisches Raummodell für den Test von Reglern für Heizungs-, Lüftungs- und KlimasystemenRiederer, Peter 05 November 2002 (has links) (PDF)
Room models, currently used for controller tests, assume the room air to be perfectly mixed. A new room model is developed, assuming non-homogeneous room conditions and distinguishing between different sensor positions. From measurement in real test rooms and detailed CFD simulations, a list of convective phenomena is obtained that has to be considered in the development of a model for a room equipped with different HVAC systems. The zonal modelling approach that divides the room air into several sub-volumes is chosen, since it is able to represent the important convective phenomena imposed on the HVAC system. The convective room model is divided into two parts: a zonal model, representing the air at the occupant zone and a second model, providing the conditions at typical sensor positions. Using this approach, the comfort conditions at the occupant zone can be evaluated as well as the impact of different sensor positions. The model is validated for a test room equipped with different HVAC systems. Sensitivity analysis is carried out on the main parameters of the model. Performance assessment and energy consumption are then compared for different sensor positions in a room equipped with different HVAC systems. The results are also compared with those obtained when a well-mixed model is used. A main conclusion of these tests is, that the differences obtained, when changing the position of the controller's sensor, is a function of the HVAC system and controller type. The differences are generally small in terms of thermal comfort but significant in terms of overall energy consumption. For different HVAC systems the cases are listed, in which the use of a simplified model is not recommended. This PhD has been submitted in accordance to the conditions for attaining both the French and the German degree of a PhD, on a co-national basis, in the frame of a statement of the French government from January 18th, 1994. The research has been carried out in the Automation and Energy Management Group (AGE), Department of Sustainable Development (DDD), at the "Centre Scientifique et Technique du Bâtiment" (CSTB) in Marne la Vallée, France, in collaboration with the "Centre Energétique" (CENERG) at the "Ecole Nationale Supérieure des Mines de Paris" (ENSMP), Paris, France and the Technical University of Dresden (TUD), Germany.
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Ausrichtung der Heizungs-, Klima- und Lüftungstechnik an den Bedürfnissen der Nutzer im WohnungsbauWagnitz, Matthias 16 February 2016 (has links) (PDF)
Planung und Ausführung in der Heizungstechnik gehen von einem idealisierten Nutzer aus, dessen Verhalten und Vorlieben bezüglich dieser Technik in der Regel aber nicht bekannt sind. Heizen 2020 untersucht „den“ Nutzer vor diesem Hintergrund statistisch mittels einer groß angelegten Befragung. Es stellt sich heraus, dass eine Unterteilung der Nutzer in drei Cluster, die sich in ihren Vorlieben deutlich unterscheiden, sinnvoll ist. Aus den Clustern wird ein Auslegungs- und Regelungskonzept entwickelt, das abweichend von der bisherigen Vorgehensweise gezielt Reserven aufbaut, diese aber regeltechnisch auf die tatsächliche Nutzeranforderung reduziert. Darauf basierend werden Hinweise für die Anpassung der Anlagentechnik an den Nutzer gegeben. / Planning and installation in heating technology are based on an idealized user whose behavior and preferences regarding this technology usually are unknown. "Heizen 2020" ("heating technology in the year 2020") examined "the" user against this background statistically by means of a large-scale survey. It turns out that a subdivision of the users into three clusters, which differ significantly in their preferences, is useful. From the clusters a design and control concept is developed that uses - different to the useal planning process - reserves . These reserves are reduced by control technology to the actual user request. Based on the clusters indications for the choice and adaptation of the heating technology are developed. / Planification et l'exécution de la technologie de chauffage sont basées sur un utilisateur idéalisé dont le comportement et les préférences en ce qui concerne cette technologie ne sont généralement pas connus. "Heizen 2020" (technology de chauffage en 2020) a enquêté sur les utilisateurs contre ce contexte statistiquement au moyen d'une enquête à grande échelle. Il se trouve qu'une subdivision des utilisateurs en trois groupes, qui sont diffèrent sensiblement dans leurs préférences, est logique. Basé sur ces groupe un concept de conception et de contrôle est développée. Indépendamment de la procédure précédente ce concept fonctionne avec des réserves dans le processus de planification et l'adaptation à la suite de la demande de l'utilisateur réel en utilisant la technologie de contrôle. Il y a des instructions développées pour sélectionner et ajuster le chauffage à l'utilisateur, sur la base des groupes développés.
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