Exergetic performance analysis of high pressure air systems on ships

Karakurt, A. Sinan; Ozsari, Ibrahim; Başhan, Veysi

doi:10.1504/ijex.2022.120109

Cited by 4 publications

(2 citation statements)

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“…He proposed that the methanol fuel is better than ethanol in terms of ECOP. Karakurt et al (2022). carried out a study on the pressurized air starting system and utilized ECOP to compare three different system models and stated that the first model has the highest ECOP value due to its low exergy destruction.…”

Section: Subscriptsmentioning

confidence: 99%

Marine engine efficiency improvement with supercritical-CO<SUB align="right">2 Rankine waste heat recovery

Koroglu¹,

Cavus²,

Bayer³

2023

IJEX

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The efficiency of marine energy systems gain more and more importance considering economic and environmental effects. Additional power is produced by annexation of a supercritical CO2 Rankine cycle (sCO2-RC) via utilization of the exhaust of a marine engine. A parametric study on sCO2-RC is carried out to optimize objective functions such as ECOP, maximum net power output with respect to the outlet temperature of the exhaust stack, and the maximum pressure of the cycle. Then, energy and exergy analyses are applied to the system. Results show that the sCO2-RC system improves thermal efficiency by 8.17% and provides a 7.54% better fuel economy, while exergy efficiency of the sCO2-RC is 51.3% with a net power output of 321.7 kW and ECOP of 1.09. Hence, the results lead to the optimization order of the investigated system components for the improvement in overall efficiency, and the reduction of fuel consumption and environmental effects.

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Section: Subscriptsmentioning

confidence: 99%

Marine engine efficiency improvement with supercritical-CO<SUB align="right">2 Rankine waste heat recovery

Koroglu¹,

Cavus²,

Bayer³

2023

IJEX

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“…In general, the results show the conditions where the EPC value is at its maximum to be more advantageous in terms of entropy production rate, exergy efficiency, and initial investment cost while having lower exergy output than the maximum values of the dimensionless ecological function and the dimensionless total exergy output. Along with power cycles and their companents, EPC has also been applied to different types of refrigerantion cycles [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2022

Sigma J Eng Nat Sci - Sigma Müh Fen Bil Derg

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Oxy-combustion technologies are green energy systems and an impressive solution to climate change and global warming. This study presents a detailed exergy analysis obtained for oxy-combustion power systems in comparison with a conventional gas turbine power system. The results include net power, overal thermal efficiency, exergy destruction, exergy efficiency, power density, exergetic performance coefficient (EPC), ecological performance coefficient (ECOP), effective ecological power density (EFECPOD), and mean exergy density (MED), and cost of power density (COPD), which are calculated as functions of pressure and oxygen ratios. The conventional gas turbine power system obtained a pressure ratio for maximum net power of 20.8. Similarly, oxy-combustion power cycles at 26%, 28%, and 30% oxygen ratios have respective pressure ratios for maximum net power of 23.3, 27.4, and 29.7. Results from 24%-30% oxygen ratios are displayed to show the reactant oxygen's effect on the oxy-combustion power cycles. Increases in the pressure ratio show decreases in the total exergy destruction in both the conventional gas turbine power system and the oxy-combustion power systems. Meanwhile, increases in the pressure ratio show increases in the total efficiency, power density, exergy efficiency, EPC, EFFECPOD, and MED in both the conventional gas turbine and the oxy-combustion power systems. In addition, increases in the oxygen ratio in the oxycombustion power systems show different characteristics for these parameters based on the pressure ratio of the cycle. In terms of COPD, conventional gas turbine power systems are more advantageous than oxy-combustion power systems. Optimum COPD is obtained at a pressure ratio of 25.6.

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