Exergy and structural analysis of an absorption cooling cycle and the effect of efficiency parameters
MetadataShow full item record
Absorption cycles are an alternative to compression cycles in cooling and refrigeration applications. Our analysis of an absorption cycle is based on the exergy and the structural analysis. Once the exergy analysis has been achieved, the coefficients of structural bonds (CSBs) of the main heat and mass exchangers can be determined by a structural analysis. The CSBs show how the modification of the irreversibility of one component, by means of a variation of its efficiency, affects the whole cycle. It will be wise to put much of the design effort in improving the efficiency of a component, knowing that a slight decrease of the irreversibility of that component, thanks to a higher efficiency, results in an important improvement in the total irreversibility of the cycle. This methodology is applied to a single effect ammonia-water absorption cooling cycle. We also study how the selection of efficiency parameters affects the results comparing CSBs of heat exchangers obtained from the minimum temperature differences or the UA-values. Results show that the UA is a more suitable parameter than the minimum temperature difference. Concerning the CSB values, we obtain very high values for the refrigerant heat exchanger. Values above one are also observed for the absorber, condenser and generator. Lower values are found for the generator and the solution heat exchanger. A more detailed analysis should investigate the dependence of the CSB values on the range of efficiencies. As a further step, these results could be used in the thermoeconomic analysis and economical optimization.
Is part ofInternational Journal of Thermodynamics, 2005, vol.8, núm.4, p.191-198
European research projects
Showing items related by title, author, creator and subject.
Effect of internal heat recovery in ammonia-water absorption cooling cycles: exergy and structural analysis Boer, Dieter; Gebreslassie, Berhane Hagos; Medrano Martorell, Marc; Nogués Aymamí, Miquel (International Centre for Applied Thermodynamics, 2009)First and second law analysis have been conducted for three low temperature driven ammonia-water absorption cooling cycles with increasing internal heat recovery. Based on the results of exergy analysis the structural ...
Gebreslassie, Berhane Hagos; Medrano Martorell, Marc; Boer, Dieter (Elsevier, 2010)An exergy analysis, which only considers the unavoidable exergy destruction, is conducted for single, double, triple and half effect Water–Lithium bromide absorption cycles. Thus, the obtained performances represent the ...
Theoretical analysis of a novel integrated energy system formed by a microturbine and a exhaust fired single-double effect absorption chiller Medrano Martorell, Marc; Mauzey, Josh; McDonell, Vince; Samuelsen, G. Scott; Boer, Dieter (International Centre for Applied Thermodynamics, 2006)Integrated Energy Systems (IES) combine a distributed power generation system (DG) such as a microturbine generator (MTG) or a fuel cell with thermally activated technologies (TAT) such as absorption cooling. This integration ...