Advances of Zero Flow Simulation of Air Conditioning Systems using Modelica
Pieter Dermont, Dirk Limperich, Johan Wíndahl, Katrin Prölß, Carsten Kübler · Linköping electronic conference proceedings · 2016
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.