VERSATILITY STUDY OF NH3-H2O AND H2O-LIBR ABSORPTION REFRIGERATION SYSTEMS TO DIFFERENT OPERATING CONDITIONS

Autor/autori: Adina-Teodora GHEORGHIAN , Camelia STANCIU , Dorin STANCIU, Claudia IONIŢĂ, Beatrice TĂNASE p38-43


Abstract: The study is focused on comparing two absorption refrigeration systems (ARS) operating under the same conditions but using different fluid mixtures, namely NH3-H2O and H2O-LiBr solutions. Their versatility to different heat source and environmental temperatures is emphasized. Their limits of operation are compared, as well as their energetic and exergetic performances. The study reveals that NH3-H2O ARS is more adaptable to heat source temperature variations, operating over a larger interval of temperatures, but provides lower coefficients of performance and exergetic efficiencies. On the other hand, embedding a regenerative heat exchanger improves the performances of H2O-LiBr ARS, no matter the vaporization and heat source temperature. The corresponding improvement on NH3-H2O system may have a negative effect in certain range of temperatures. The conclusions of the study emphasize which solution is the best choice depending on operating temperatures and under what conditions a regenerative heat exchanger is useful.

Keywords: absorption refrigeration systems, exergetic efficiency, coefficient of performance, regenerative heat exchanger.

 

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