Thermodynamic analysis of using compressor in absorption heat transformers with ammonia-lithium nitrate and ammonia sodium thiocyanate as working fluids

Authors

1 Faculty of Mechanical Engineering, University of Tabriz, Tabriz , Iran

2 Department of Mechanics, Azarbaijan Shahid Madani University

Abstract

In this article, three configurations of using compressor in absorption heat transformers are introduced and analyzed thermodynamically and compared with simple configuration of them. Water-lithium bromide, ammonia-lithium nitrate and ammonia sodium thiocyanate solutions are used as working fluid in these systems. The results show that systems using water-lithium bromide as working fluid have lower delivered heat temperature, higher minimum generator and evaporator temperatures and higher possibility of crystallization occurrence than systems using ammonia-lithium nitrate and ammonia sodium thiocyanate fluids as working fluid. In addition, the results show that using compressor in absorption heat transformers increase the temperature of delivered heat, decrease the minimum temperatures of absorber and generator and increase PER, ECOP especially at high absorber temperature. Compared to the systems using ammonia-lithium nitrate, the systems using ammonia sodium thiocyanate starts to perform at lower generator and evaporator temperatures and delivers heat at higher temperatures, but they have lower primary energy ratio and second low efficiency except at high absorber temperatures.

Keywords

References

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Journal of Solid and Fluid Mechanics
Volume 11, Issue 3
October 2021
Pages 221-234

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