Multi-Objective Optimization of the Energy, Exergy, and Environmental Performance of a Hybrid Solar–Biomass Combined Brayton/Organic Rankine Cycle
This research proposes integrating a combined system from a supercritical Brayton cycle (SBC) at extremely high temperatures and pressures and a conventional ORC cycle. The ORC cycle was evaluated with three working fluids: acetone, toluene, and cyclohexane. Of these, the cyclohexane, thanks to its...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/18/1/203 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841549208969019392 |
|---|---|
| author | Guillermo Valencia-Ochoa Jorge Duarte-Forero Daniel Mendoza-Casseres |
| author_facet | Guillermo Valencia-Ochoa Jorge Duarte-Forero Daniel Mendoza-Casseres |
| author_sort | Guillermo Valencia-Ochoa |
| collection | DOAJ |
| description | This research proposes integrating a combined system from a supercritical Brayton cycle (SBC) at extremely high temperatures and pressures and a conventional ORC cycle. The ORC cycle was evaluated with three working fluids: acetone, toluene, and cyclohexane. Of these, the cyclohexane, thanks to its dry fluid condition, obtained the best result in the sensitivity analysis for the energetic and exergetic evaluations with the most relevant (net power and exergy destruction) for the variation in the most critical performance parameter of the system for both the configuration with reheat and the configuration with recompression. Between the two proposed configurations, the most favorable performance was obtained with a binary system with reheat and recompression; with reheat, the SBC obtained first- and second-law efficiencies of 45.8% and 25.2%, respectively, while the SBC obtained values of 54.8% and 27.9%, respectively, with reheat and recompression. Thus, an increase in overall system efficiency of 30.3% is obtained. In addition, the destroyed exergy is reduced by 23% due to the bypass before the evaporation process. The SBC-ORC combined hybrid system with reheat and recompression has a solar radiation of 950 W/m<sup>2</sup> K, an exhaust heat recovery efficiency of 0.85, and a turbine inlet temperature of 1008.15 K. The high pressure is 25,000 kPa, the isentropic efficiency of the turbines is 0.8, the pressure ratio is 12, and the pinch point of the evaporator is initially 20 °C and reaches values of 45 °C in favorable supercritical conditions. |
| format | Article |
| id | doaj-art-472f4a2446644300939d2eafd4701a2c |
| institution | Kabale University |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-472f4a2446644300939d2eafd4701a2c2025-01-10T13:17:24ZengMDPI AGEnergies1996-10732025-01-0118120310.3390/en18010203Multi-Objective Optimization of the Energy, Exergy, and Environmental Performance of a Hybrid Solar–Biomass Combined Brayton/Organic Rankine CycleGuillermo Valencia-Ochoa0Jorge Duarte-Forero1Daniel Mendoza-Casseres2Programa de Ingeniería Mecánica, Universidad del Atlántico, Carrera 30 Número 8-49, Puerto Colombia, Barranquilla 080007, ColombiaPrograma de Ingeniería Mecánica, Universidad del Atlántico, Carrera 30 Número 8-49, Puerto Colombia, Barranquilla 080007, ColombiaPrograma de Ingeniería Industrial, Universidad del Atlántico, Carrera 30 Número 8-49, Puerto Colombia, Barranquilla 080007, ColombiaThis research proposes integrating a combined system from a supercritical Brayton cycle (SBC) at extremely high temperatures and pressures and a conventional ORC cycle. The ORC cycle was evaluated with three working fluids: acetone, toluene, and cyclohexane. Of these, the cyclohexane, thanks to its dry fluid condition, obtained the best result in the sensitivity analysis for the energetic and exergetic evaluations with the most relevant (net power and exergy destruction) for the variation in the most critical performance parameter of the system for both the configuration with reheat and the configuration with recompression. Between the two proposed configurations, the most favorable performance was obtained with a binary system with reheat and recompression; with reheat, the SBC obtained first- and second-law efficiencies of 45.8% and 25.2%, respectively, while the SBC obtained values of 54.8% and 27.9%, respectively, with reheat and recompression. Thus, an increase in overall system efficiency of 30.3% is obtained. In addition, the destroyed exergy is reduced by 23% due to the bypass before the evaporation process. The SBC-ORC combined hybrid system with reheat and recompression has a solar radiation of 950 W/m<sup>2</sup> K, an exhaust heat recovery efficiency of 0.85, and a turbine inlet temperature of 1008.15 K. The high pressure is 25,000 kPa, the isentropic efficiency of the turbines is 0.8, the pressure ratio is 12, and the pinch point of the evaporator is initially 20 °C and reaches values of 45 °C in favorable supercritical conditions.https://www.mdpi.com/1996-1073/18/1/203simulationcycleORCSBCsuperheatpinch point |
| spellingShingle | Guillermo Valencia-Ochoa Jorge Duarte-Forero Daniel Mendoza-Casseres Multi-Objective Optimization of the Energy, Exergy, and Environmental Performance of a Hybrid Solar–Biomass Combined Brayton/Organic Rankine Cycle Energies simulation cycle ORC SBC superheat pinch point |
| title | Multi-Objective Optimization of the Energy, Exergy, and Environmental Performance of a Hybrid Solar–Biomass Combined Brayton/Organic Rankine Cycle |
| title_full | Multi-Objective Optimization of the Energy, Exergy, and Environmental Performance of a Hybrid Solar–Biomass Combined Brayton/Organic Rankine Cycle |
| title_fullStr | Multi-Objective Optimization of the Energy, Exergy, and Environmental Performance of a Hybrid Solar–Biomass Combined Brayton/Organic Rankine Cycle |
| title_full_unstemmed | Multi-Objective Optimization of the Energy, Exergy, and Environmental Performance of a Hybrid Solar–Biomass Combined Brayton/Organic Rankine Cycle |
| title_short | Multi-Objective Optimization of the Energy, Exergy, and Environmental Performance of a Hybrid Solar–Biomass Combined Brayton/Organic Rankine Cycle |
| title_sort | multi objective optimization of the energy exergy and environmental performance of a hybrid solar biomass combined brayton organic rankine cycle |
| topic | simulation cycle ORC SBC superheat pinch point |
| url | https://www.mdpi.com/1996-1073/18/1/203 |
| work_keys_str_mv | AT guillermovalenciaochoa multiobjectiveoptimizationoftheenergyexergyandenvironmentalperformanceofahybridsolarbiomasscombinedbraytonorganicrankinecycle AT jorgeduarteforero multiobjectiveoptimizationoftheenergyexergyandenvironmentalperformanceofahybridsolarbiomasscombinedbraytonorganicrankinecycle AT danielmendozacasseres multiobjectiveoptimizationoftheenergyexergyandenvironmentalperformanceofahybridsolarbiomasscombinedbraytonorganicrankinecycle |