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I. Hafner:
"Möglichkeiten der Co-Simulation mit dem Building Controls Virtual Test Bed für den Bereich der objektorientierten Modellbildung physikalischer Systeme";
Supervisor: F. Breitenecker; Institut für Analysis und Scientific Computing, 2013; final examination: 2013-03-14.

This thesis considers the possibilities of cooperative simulation (abbr. co-simulation) with the co-simulation tool BCVTB (short for Building Controls Virtual Test Bed). For the aim of energy
optimization in the manufactoring industry a building model as well as several machine models have to be combined. This problem is faced with co-simulation. Co-simulation enables the overall simulation of models requiring different modelling approaches and hugely differing step sizes or even solver algorithms.
The introductory chapters describe the method of object-oriented modelling of physical systems since most of the included models are implemented based on this approach.
Subsequently different co-simulation methods are discussed. Additionally, the basics concerning numerics of co-simulation are described to justify this method considering numerical stability and consistency.
The first part of the implementation section deals with the ynchronization of all simulators in spite of their individual solver algorithms since accurate synchronization is necessary to even enable cooperative simulation. The following sections contain a detailed description of all partial models of the room and the machines which will be used in the co-simulation.
Thus the development of a thermal compartment model for the machine hall in Modelica via Dymola and individual machine models implemented in MATLAB, Simscape and Dymola as well as a Simulink model for temperature control are described.
The beginning of the following case studies deals with the validation of the Dymola room model and the advantages and disadvantages of separating huge models into partial ones for co-simulation. Besides co-simulating individual machine models with the room model,
the BCVTB´s performance at the co-simulation of many instances of all simulators and complex partial models is evaluated. Additionally the differences of the modelling and simulation methods of the room model developed in this thesis and an EnergyPlus model of the same
building are discussed.
A summary of the possibilities and limits of cooperative simulation with the BCVTB followed by general results of this work and possibilities for further studies concludes the thesis.

http://publik.tuwien.ac.at/files/PubDat_224456.pdf