Studies on a water-based absorption heat transformer for desalination using MED

Vapor absorption heat transformer coupled with MED system is an attractive option for water desalination using low temperature waste heat. A simulation model has been developed to predict the performance characteristics such as coefficient of performance (COP), distilled water output, total specific thermal energy consumption (OSTEC) and performance ratio (PR) of the coupled system for various water based working fluid combinations. For waste heat input in the temperature range of 60°C to 80°C and sink temperature in the range of 20°C to 40°, the performance of water based working fluids is compared, while considering gross temperature lift (GTL) up to 40°C. The results show that between the specified range of operating conditions, the working fluid system H2O-(LiCl+LiNO3) gives the highest COP while consuming the lowest specific thermal energy for water purification using the coupled system, followed by H2O-LiBr, H2O-LiI, H2O-(LiBr+LiNO3), H2O-(LiBr+ZnBr2+LiCl2) and H2O-(LiCl+CaCl2+Zn(NO3)2) systems resp...

[1]  Kashinath R. Patil,et al.  Thermodynamic design data for absorption heat transformers—part III. Operating on water-lithium iodide , 1991 .

[2]  Rosenberg J. Romero,et al.  Portable water purification system integrated to a heat transformer , 2004 .

[3]  Rosenberg J. Romero,et al.  Increase of COP for heat transformer in water purification systems. Part I – Increasing heat source temperature , 2007 .

[4]  Lin Shi,et al.  Performance analysis of an absorption heat transformer with different working fluid combinations , 2000 .

[5]  Tadashi Uemura,et al.  Physical and thermal properties of the water-lithium bromide-lithium nitrate system , 1993 .

[6]  M. Al-Shammiri,et al.  Multi-effect distillation plants: state of the art , 1999 .

[7]  A. Kumar,et al.  Vapour pressure and enthalpy of aqueous lithium bromide solutions , 1992 .

[8]  Tadashi Uemura,et al.  Performance characteristics of the water-lithium bromide-zinc chloride-calcium bromide absorption refrigerating machine, absorption heat pump and absorption heat transformer , 1990 .

[9]  Risto Saari.  Usability of low temperature waste heat for sea water desalination , 1981 .

[10]  T. Uemura,et al.  Vapour pressure of the water—lithium bromide system and the water—lithium bromide—zinc bromide—lithium chloride system at high temperatures , 1989 .

[11]  F. A. Holland,et al.  Thermodynamic design data for absorption heat transformers—Part III. Operating on water-lithium chloride , 1988 .

[12]  Alberto Coronas,et al.  Purification of seawater using absorption heat transformers with water-(LiBr+LiI+LiNO3+LiCl) and low temperature heat sources , 2004 .

[13]  Siyoung Jeong,et al.  Thermodynamic design data and performance evaluation of the water + lithium bromide + lithium iodide + lithium nitrate + lithium chloride system for absorption chiller , 2000 .

[14]  M. J. Moran,et al.  Thermodynamic properties of lithium bromide/water solutions , 1987 .

[15]  K. Abrahamsson,et al.  On the efficiencies of absorption heat transformers , 1992 .