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Development of a virtual reality environment for interactive thermal room simulation This article describes an approach in which the modeling and simulation process for the indoor climate of buildings takes place entirely in a virtual reality (VR) environment. In this way, the simulation expert is immersively involved with regard to the spatial design, spatial perception and interaction with the spatial model. The simulated indoor climate resulting from the interactions and other variables such as energy demands are visualized in the VR environment as a feedback to the user. To implement the described approach in terms of software, the Modelica tool Dymola was integrated with the game engine Unity to form a complete system, with bidirectional data exchange taking place between the two programs. The building model of the Modelica library BuildingSystems forms the basis of the building physics calculations in Dymola. In Unity, a head‐mounted display was integrated to implement the VR simulation environment, and the two modes "modeling" and "simulation" were prototypically implemented and evaluated in a simulation scenario. [ABSTRACT FROM AUTHOR]

Am Lehrstuhl für Versorgungsplanung und Versorgungstechnik der UdK Berlin wird die Modelica-Modellbibliothek 'BuildingSystems' zur objektorientierten Modellierung und Simulation komplexer energietechnischer Gebäudesysteme entwickelt. Die Modelle der Bibliothek decken ein breites Spektrum aus den Bereichen Raum und Gebäude, solare Energietechnik (Solarthermie, Photovoltaik) sowie Heizungs- und Klimatechnik ab und werden um weitere Spezialmodelle zum Erzeugen geeigneter Klima- und Nutzer-Randbedingungen ergänzt. Ein besonderes Merkmal der Bibliothek besteht darin, dass eine Reihe der Modelle in unterschiedlicher räumlicher oder physikalischer Detaillierungstiefe vorliegen. So lässt sich mit der Modellbibliothek ein Nahwärmenetz mit einer Reihe stark vereinfachter Gebäudeverbraucher-Modelle, aber auch ein detailliertes hydraulisches Netz einer Heizungsanlage zusammen mit einem detaillierten Mehrzonen-Gebäudemodell abbilden. Im vorliegenden Beitrag werden die grundlegenden Eigenschaften der Modelica-Bibliothek 'BuildingSystems' beschrieben und an Hand mehrerer Anwendungsbeispiele demonstriert. The Modelica library BuildingSystems for object-oriented modelling and simulation of complex energetic building systems. The Modelica library 'BuildingSystems' for object-oriented modelling and simulation of complex energetic building systems is being developed by the chair of building services technology at UdK Berlin. The models of the library cover a broad spectrum of the domains such as room and building, solar energy technologies (solar thermal energy, photovoltaics), HVAC and are completed with specialized models for the generation of boundary conditions of the user behavior and climate data. A special feature is the fact that several models are present in different levels of detail in space and in the physical meaning. For example, a model of a district heating net-work combined with a set of strong simplified building models or a detailed hydraulic net of a heating system combined with a detailed multi-zone building model can be reflected by the model library. The paper describes the most important features of the Modelica library 'BuildingSystems' and demonstrates them by the use of several applications. [ABSTRACT FROM AUTHOR]