Introduction to the Exergy Analysis of Absorption-Resorption Refrigeration Machine

Exergy analysis is a part of thermodynamic analysis. It became very popular in scientific research in the field of refrigeration and heap pumps. Information obtained from the exergy analysis is deeper than information obtained from any other methods, for example energe- tic analysis. It can also be applied to the absorption machines that are most complex among all refrigeration machines. In the paper, the algorithm of the exergy analysis for the absorption-resorption refrigeration machine (as a particular case of an absorption refrigeration machine) has been developed. The main difference between absorption-resorption and absorption refrigeration machines is that four phase change processes with the working fluid (mixture) occur at variable temperature: heat transfer to the generator, cold generation in degasator, heat rejection in resorber and absorber. In analysis, this particular case is taking into account through considering the sum of physical and chemical exergy for each material stream. Using an example, the methodology for determination of the reference state for calculating the physical exergy for the mixture with different concentrations has been demonstrated. Such an approach for analysis of components of absorption machines leads to an increase in the accuracy of the obtained results and understanding the thermodynamic inefficiencies. As the results it will help to develop the ideas for improvement of the overall system. The algorithm of the exergy analysis for the components and the overall resorption machine can be used for evaluation of any of absorption machines independent of the used working fluid (mixture) and schematics.