Energy and exergy analysis of an experimental single‐stage heat transformer operating with the water/lithium bromide mixture

The first and second law of thermodynamics have been used to analyze the performance of an experimental single-stage heat transformer operating with the water/lithium bromide mixture. Enthalpy coefficients of performance (COP), external coefficients of performance (COPEXT), exergy coefficient of performance (ECOP), exergy destruction or irreversibility in the system and components (I) and the improvement potential (Pot) have been calculated against the gross temperature lift and the main operating temperatures of the system. The results showed that the highest COP, COPEXT and ECOP values are obtained at the highest solution concentrations meanwhile the Pot and the I of the cycle remain almost constant against these parameters. Also it was shown that the COP, COPEXT and ECOP decrease with an increase with the absorber temperature, meanwhile the Pot and the I increase. Moreover, it was observed that in all the cases independently of the operating temperatures of the system, the absorber accounts with most of the half of the total irreversibility in the system. Finally, it was shown that the improvement potential is considerable for the system. Copyright © 2009 John Wiley & Sons, Ltd.

[1]  Wilfrido Rivera,et al.  Energy and exergy analysis of a double absorption heat transformer operating with water/lithium bromide , 2009 .

[2]  Rosenberg J. Romero,et al.  Theoretical and experimental comparison of the performance of a single-stage heat transformer operating with water/lithium bromide and water/Carrol™ , 2002 .

[3]  Adnan Sözen,et al.  Exergy analysis of an ejector-absorption heat transformer using artificial neural network approach , 2007 .

[4]  Jorge Islas,et al.  Exergy efficiency of an ammonia-water absorption system for ice production , 1993 .

[5]  Roberto Best,et al.  Experimental performance of ternary solutions in an absorption heat transformer , 1998 .

[6]  Wilfrido Rivera,et al.  Experimental study of the use of additives in the performance of a single‐stage heat transformer operating with water–lithium bromide , 2005 .

[7]  F. A. Holland,et al.  Thermodynamic study of advanced absorption heat transformers—II. Double absorption configurations , 1994 .

[8]  Rabah Gomri,et al.  Second law analysis of double effect vapour absorption cooler system , 2008 .

[9]  Adnan Sözen,et al.  Effect of irreversibilities on performance of an absorption heat transformer used to increase solar pond¿s temperature , 2004 .

[10]  Zongchang Zhao,et al.  The thermodynamic performance of a new solution cycle in double absorption heat transformer using water/lithium bromide as the working fluids , 2003 .

[11]  B. Agnew,et al.  Exergy analysis: an absorption refrigerator using lithium bromide and water as the working fluids , 2000, Applied Thermal Engineering.

[12]  Masaru Ishida,et al.  Graphical exergy study on single stage absorption heat transformer , 1999 .

[13]  S. A. Fartaj,et al.  Comparison of energy, exergy, and entropy balance methods for analysing double‐stage absorption heat transformer cycles , 2004 .

[14]  C. Heard.  Performance study of a double‐absorption water/calcium chloride heat transformer , 1998 .

[15]  F. A. Holland,et al.  Experimental performance of the water/calcium chloride system in a heat transformer , 1996 .

[16]  Y. Shih,et al.  Exergy and energy analyses of absorption heat pumps , 1988 .

[17]  Muhsin Kilic,et al.  Second law-based thermodynamic analysis of water-lithium bromide absorption refrigeration system , 2007 .

[18]  Abdul Khaliq,et al.  Exergy analysis of double effect vapor absorption refrigeration system , 2008 .

[19]  F. A. Holland,et al.  Thermodynamic study of advanced absorption heat transformers—I. Single and two stage configurations with heat exchangers , 1994 .

[20]  Rosenberg J. Romero,et al.  Experimental evaluation of a single-stage heat transformer operating with the water/Carrol™ mixture , 1999 .

[21]  A. Vidal,et al.  Analysis of a combined power and refrigeration cycle by the exergy method , 2006 .

[22]  Y. Kaita,et al.  Thermodynamic properties of lithium bromide-water solutions at high temperatures. , 2001 .

[23]  Soteris A. Kalogirou,et al.  Exergy analysis of lithium bromide/water absorption systems , 2005 .

[24]  R. Best,et al.  EXPERIMENTAL PERFORMANCE OF THE SYSTEM WATER/MAGNESIUM CHLORIDE IN A HEAT TRANSFORMER , 1997 .