Conference article

Advances of Zero Flow Simulation of Air Conditioning Systems using Modelica

Pieter Dermont
Modelon AB, Sweden

Dirk Limperich
Daimler AG, Germany

Johan Windahl
Modelon AB, Sweden

Katrin Prölss
Modelon AB, Sweden

Carsten Kübler
TWT GmbH, Germany

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Published in: The First Japanese Modelica Conferences, May 23-24, Tokyo, Japan

Linköping Electronic Conference Proceedings 124:18, p. 139-144

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Published: 2016-05-18

ISBN: 978-91-7685-749-6

ISSN: 1650-3686 (print), 1650-3740 (online)


This paper describes recent advances in simulation of zero flow conditions based on work with Daimler using the Air Conditioning Library from Modelon. The Air Conditioning Library is based on the open standard modelling language Modelica. Simulating refrigerant loops at (near) zero flow for large vapor compression cycles is challenging, due to the fast dynamics in the model under those conditions that drastically reduce the step size of the solver. Findings on solver selection and pressure drop correlations are presented. An approach to improve zero flow simulation based on a systematic analysis of heat transfer coefficients is suggested and demonstrated to increase simulation robustness under (near) zero flow conditions.


air conditioning systems, zero flow, 1-D fluid modelling, dynamic simulation, numerical issues


Hubertus Tummescheit. Design and implementation of objectoriented model libraries using modelica. PhD thesis, Lund University, 2002.

Hubertus Tummescheit, Jonas Eborn, and Katrin Prolss. Airconditioning–a modelica library for dynamic simulation of ac systems. In 4th International Modelica Conference, 2005.

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