16 research outputs found
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Validation of the Window Model of the Modelica Buildings Library
This paper describes the validation of the window model of the free open-source Modelica Buildings library. This paper starts by describing the physical modeling assumptions of the window model. The window model can be used to calculate the thermal and angular properties of glazing systems. It can also be used for steady-state simulation of heat transfer mechanism in glazing systems. We present simulation results obtained by comparing the window model with WINDOW 6 the well established simulation tool for steady-state heat transfer in glazing systems. We also present results obtained by comparing the window model with measurements carried out in a test cell at the Lawrence Berkeley National Laboratory
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Tool coupling for the design and operation of building energy and control systems based on the Functional Mock-up Interface standard
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Validation and Application of the Room Model of the Modelica Buildings Library
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Validation of the Window Model of the Modelica Buildings Library
This paper describes the validation of the window model of the free open-source Modelica Buildings library. This paper starts by describing the physical modeling assumptions of the window model. The window model can be used to calculate the thermal and angular properties of glazing systems. It can also be used for steady-state simulation of heat transfer mechanism in glazing systems. We present simulation results obtained by comparing the window model with WINDOW 6 the well established simulation tool for steady-state heat transfer in glazing systems. We also present results obtained by comparing the window model with measurements carried out in a test cell at the Lawrence Berkeley National Laboratory
Development of an object-oriented model library for the investigation and optimization of hygrothermal and hygienic comfort in rooms
Die Entwicklung energetisch optimierter Lüftungsstrategien für feuchtebedingte Probleme bzw. die Planung und die Sanierung energiesparender Gebäude benötigt eine genaue Kenntnis über das hygrothermische Bauteil- und Gebäudeverhalten. Diese Fragestellungen können vor dem eigentlichen messtechnischen Ausführen mit Hilfe von Simulationstools beantwortet werden. Die Komplexität solcher Fragestellungen führt zu komplexen Modellen, die schnell unüberschaubar werden können, wenn nicht geeignete Beschreibungsmittel verwendet werden. Modellierungssprachstandards wie Modelica ermöglichen aufgrund ihrer generischen Konzepte, wie beispielsweise Klassenprinzip, Vererbungsprinzip, Aggregationsprinzip und Polymorphie, solche komplexen Systeme in einfache Teilsysteme zu zerlegen, diese zu verifizieren und dann wieder zusammenzuführen.
In der Forschung existieren bisher keine generischen Simulationstools zur Bauteil- und Gebäudesimulation, die eine hygrothermische Analyse mit starken Wechselwirkungen zwischen Bauteilverhalten, Gebäudehülle, Gebäudenutzung sowie dem Raumklima ermöglichen.
Ziel dieser Arbeit ist deshalb die Entwicklung einer flexiblen objektorientierten hygrothermischen Modellbibliothek, basierend auf der Modellierungssprache Modelica, für die Simulation und die Analyse der Wechselwirkungen zwischen Raumklima, Bauteilverhalten, Gebäudehülle sowie Gebäudenutzung. Diese Modellbibliothek soll für die Entwicklung eines energetisch optimierten, bedarfsgeregelten Lüftungssystems zur Minimierung des Risikos der Schimmelpilzbildung unter Einhaltung eines hygrothermischen und hygienischen Komforts eingesetzt werden. Die Komponenten- bzw. Modellbibliothek soll in exemplarischen Konfigurationen simulativ sowie experimentell validiert werden.The development of ventilation strategies for moisture problems, the reduction of the heating and cooling demands, the guarantee of thermal, hygric and hygienic comfort in building construction as well as the performance and the durability of building components are questions which are related to the strong interactions between the climate conditions, the building components and the building envelope. These questions can be answered with the help of efficient building simulation tools before building planning, building design, or building rehabilitation.
Until now, models which use the generic concepts of object-oriented modeling language standards like Modelica for the simulation of the hygrothermal analysis of the interactions between building components and building envelope are missing in building physics.
In this thesis, the advantages of the generic concepts of Modelica are used to develop a flexible building physics library for the simulation of the hygrothermal behavior of building components and building envelope under unsteady conditions. This model library is validated and is used to develop a controlled ventilation system to minimize the risk of mould growth while preventing hygrothermal and hygienic discomfort in building room