Thermodynamic and exergoeconomic analysis and optimization of a Standard ammonia-water generator-absorber heat exchange (GAX) based absorption refrigeration cycle

Document Type : Propulsion and Heat Transfer

Authors

University of Bonab

Abstract

In this article, a standard GAX absorption refrigeration cycle is investigated from the viewpoints of thermodynamics and thermos economics and its optimization is performed with the aim of obtaining maximum COP (or maximum exergy efficiency) or minimum unit product cost. The thermodynamic analysis of this system is done by applying the mass, energy and exergy balance equations on different components of the system, and its economic analysis is performed by solving simultaneously, the exergy-economics equations for each of the system components. The system is analyzed and optimized by defining the first and second laws of thermodynamics and also defining the unit exergy cost of the product. The key parameters selected as optimization parameters for the proposed system are the generator temperature, the condenser temperature and the degassing range (the difference between densities of the strong solution and that of the weak solution). Results indicate that in comparison with the thermodynamically optimized condition (maximum COP or exergy efficiency), minimum unit product cost is obtained at a lower generator temperature. Optimization results show that at minimum unit product cost, COP and 2nd law efficiency are calculated to be 0.602 and 0.508, which are 57.2% and 57.35% less in comparison with their maximum values, respectively.  

Keywords

References

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History

  • Receive Date: 16 March 2019
  • Revise Date: 09 December 2019
  • Accept Date: 25 August 2020
  • Publish Date: 22 October 2020

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