Thermodynamic and Thermo-Economic Analysis of the Absorption Heat Transformer, Organic Rankine Cycle, and Reverse Osmosis Desalination Combined System

Document Type : Research Article

Authors

1 Renewable Energies & Energy Conversion Department, Institute of Science & High Technology & Environmental Sciences, Kerman Graduate University of Advanced Technology, Kerman, Iran

2 Department of Mechanical Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran

3 Department of Mechanical Engineering, Faculty of Engineering, University of Zabol, Sistan & Baluchestan, Iran

Abstract

In this study, the thermodynamic and thermo-economic analysis of an absorption heat transformer, organic Rankine cycle and reverse osmosis desalination combined system was performed aiming at generation the electricity and fresh water from low-temperature heat sources. All analyses are based on the thermodynamic and thermo-economic laws. The results have shown that the absorption heat transformer with the coefficient of performance of 0.4372 produces 494.7 kW of thermal energy at a temperature of 105°C in the absorber. By applying the absorption heat transformer produced thermal energy, it is possible to produce 63.18 kW of electricity in the organic Rankine cycle. By using this amount of electricity in the reverse osmosis system, 216.2m3/day of freshwater is produced at the cost of 2.217$/m3. Also, in thermo-economic analysis, the unit cost of the exergy for all points of the system and the unit cost of the electricity and fresh water were calculated. The levelized cost of electricity at different heat rates was determined and it was shown that the levelized cost of electricity is reduced when the heat rate is increased. Also, the effects of the capital cost of each system and real interest rate changes on the unit cost of the fresh water were studied.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 1 (Special Issue)
April 2021
Pages 639-654

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