POSGRADO EN INFORMÁTICA

Abstract: Absorption machines are becoming an increasingly important alternative to the conventional vapor-compression chillers, due to the possibility of being powered with heat from renewable energy sources, such as solar energy, biomass or others. Most of the current approaches to model LiBr absorption machines are made on stationary conditions, with less attention being paid to the dynamic phenomena inherent to the use of renewable energy sources. A dynamic hybrid thermodynamic model of a LiBr Absorption Machine is developed in this work using Modelica language, pursuing an object-oriented physical modeling philosophy. State-of-the-art equations of state (EOS) are used to ensure accuracy for long term performance, while retaining computational efficiency. Comparison with data from a 1kW absorption machine shows a good agreement. A COP of 0.74 and a cooling capacity of 1kW were obtained in nominal conditions. Simulations were conducted to assess the influence on performance of external temperatures, mass flow rates and internal heat losses. Illustrative responses to dynamic inpu