Contribution to Numerically Efficient Modelling of Thermodynamic SystemsA

This thesis investigates two aspects of numerically efficient system modelling: calculation of thermophysical properties, and modelling of tubes and heat exchangers. Four interpolation algorithms for highly precise thermophysical properties of pure and pseudo pure fluids are discussed, implemented, and compared in terms of: calculation speed, thermodynamic consistency, amount of data required, and influence on the DAE-solving process. A new, general, fail-safe, flexible, and fast method to describe the two phase region of a binary mixture based on spline interpolation is presented, that employs the highly precise multiparameter equation of state. A simplified finite volume method that enables the numerically efficient simulation of tubes and heat exchangers on system level is discussed. For the first time the singularity occurring in the algebraic relations is located and eliminated. Finally, the above mentioned methods and models are applied to an evaluation of alternative air conditioning systems of a city bus.

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