Examining the exergy-economic structure of different structures of supercritical Brayton cycle of carbon dioxide using heliostat collector

Document Type : Original Article

Authors

1 Professor, Department of Thermo-fluid, University of Guilan, Rasht, Iran

2 PhD student of energy conversion, University of Guilan, Rasht, Iran

10.22059/ses.2024.376145.1065

Abstract

In this research, two different structures of the combined system of supercritical Brayton cycle of carbon dioxide with regenerator along with organic Rankine cycle and also the combined system of supercritical Brayton cycle recondensation with organic Rankine cycle with heliostat collector from the point of view of energy and economic-exergy simulated and compared. R123 fluid has been used in organic cycle due to its suitable thermophysical and environmental properties. The results indicate that with the change of the influencing parameters such as the compressor pressure ratio and the turbine inlet temperature, the work output of the system with the regenerator has been higher in all the examined efficiencies, but the exergy efficiency of the recompression system is higher in the ratio of low pressures in the compressor. Also, despite the higher overall cost rate of the system with the regenerator, this system creates a lower electricity production cost. Other simulation results indicate that the highest amount of exergy destruction occurs in the solar collector that is about 9726 kW. And the solar collector, having the highest cost rate, should be examined more than other components from an exergy-economic point of view. Finally, a parametric analysis has been done the effects of the change in compressor pressure ratio with 3485$/h, turbine inlet temperature, and low pressure, on the performance of the system, from the perspective of energy and exergy-economics.

Keywords

Main Subjects

References

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Journal of sustainable Energy Systems
Volume 3, Issue 2
April 2024
Pages 173-192

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