Performance enhancement of organic single-flash cycles by eliminating the throttle valves: A comparative exergy-economic assessment
The excessive energy and exergy wastage resulting from the throttling processes in flash-based cycles is a significant concern. Researchers have proposed several solutions to mitigate these negative impacts. Nevertheless, there has been limited focus on comparing these solutions. The present study i...
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Elsevier
2025-03-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X2500070X |
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| author | Aboulbaba Eladeb Ali B.M. Ali Pooya Ghodratallah Kuwar Mausam Rahul Thakur Praney Madan Lotfi Ben Said Lioua Kolsi |
| author_facet | Aboulbaba Eladeb Ali B.M. Ali Pooya Ghodratallah Kuwar Mausam Rahul Thakur Praney Madan Lotfi Ben Said Lioua Kolsi |
| author_sort | Aboulbaba Eladeb |
| collection | DOAJ |
| description | The excessive energy and exergy wastage resulting from the throttling processes in flash-based cycles is a significant concern. Researchers have proposed several solutions to mitigate these negative impacts. Nevertheless, there has been limited focus on comparing these solutions. The present study is carried out to compare the thermo-economic performances of five organic cycles driven by a geothermal heat source. The configurations are an organic Rankine cycle (ORC), an organic flash cycle (OFC), a modified organic flash cycle (MOFC), an organic flash regenerative cycle (OFRC), and a modified organic flash regenerative cycle (MOFRC). The five configurations are compared in the optimum operating conditions considering the exergy efficiency (ηex) and the unit cost of electricity generation (cel) as the determinant parameters. The MOFC and MOFRC demonstrate a significant enhancement in ηex, with an improvement of 10.94 % points and 5.6 % points, respectively, compared to the OFC and OFRC. Furthermore, ηex of the OFRC and MOFRC exhibits an improvement, with values 9.15 % points and 3.81 % points higher than those of the OFC and MOFC, respectively. Notably, the basic ORC has the highest ηex equal to 54.26 %. However, its investment cost rate (Z˙tot) is 8 % higher than the MOFRC. In addition, the MOFRC, with an ηex and cel of 51.8 % and 6.87 $GJ−1, has a competitive performance compared to the ORC. A comprehensive comparison between the MOFRC and previous configurations based on the flash process indicates that the MOFRC has the highest ηex and lowest cel among the configurations. |
| format | Article |
| id | doaj-art-439ac9f3cc814c1f907047203154ad31 |
| institution | Kabale University |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-439ac9f3cc814c1f907047203154ad312025-02-04T04:10:25ZengElsevierCase Studies in Thermal Engineering2214-157X2025-03-0167105810Performance enhancement of organic single-flash cycles by eliminating the throttle valves: A comparative exergy-economic assessmentAboulbaba Eladeb0Ali B.M. Ali1Pooya Ghodratallah2Kuwar Mausam3Rahul Thakur4Praney Madan5Lotfi Ben Said6Lioua Kolsi7Mining Research Center, Northern Border University, P.O. Box 1321, Arar 91431, Saudi ArabiaAir Conditioning Engineering Department, College of Engineering, University of Warith Al-Anbiyaa, Karbala, IraqDepartment of Civil Engineering, College of Engineering, Cihan University-Erbil, Erbil, Iraq; Corresponding author. Department of Civil Engineering, College of Engineering, Cihan University-Erbil, Erbil, IraqDepartment of Mechanical Engineering, Institute of Engineering and Technology, GLA University, Mathura (U.P.), IndiaCentre of Research Impact and Outcome, Chitkara University, Rajpura 140417, Punjab, IndiaChitkara Centre for Research and Development, Chitkara University, Himachal Pradesh 174103, IndiaDepartment of Mechanical Engineering, College of Engineering, University of Ha'il, Ha'il City 81451, Saudi ArabiaDepartment of Mechanical Engineering, College of Engineering, University of Ha'il, Ha'il City 81451, Saudi ArabiaThe excessive energy and exergy wastage resulting from the throttling processes in flash-based cycles is a significant concern. Researchers have proposed several solutions to mitigate these negative impacts. Nevertheless, there has been limited focus on comparing these solutions. The present study is carried out to compare the thermo-economic performances of five organic cycles driven by a geothermal heat source. The configurations are an organic Rankine cycle (ORC), an organic flash cycle (OFC), a modified organic flash cycle (MOFC), an organic flash regenerative cycle (OFRC), and a modified organic flash regenerative cycle (MOFRC). The five configurations are compared in the optimum operating conditions considering the exergy efficiency (ηex) and the unit cost of electricity generation (cel) as the determinant parameters. The MOFC and MOFRC demonstrate a significant enhancement in ηex, with an improvement of 10.94 % points and 5.6 % points, respectively, compared to the OFC and OFRC. Furthermore, ηex of the OFRC and MOFRC exhibits an improvement, with values 9.15 % points and 3.81 % points higher than those of the OFC and MOFC, respectively. Notably, the basic ORC has the highest ηex equal to 54.26 %. However, its investment cost rate (Z˙tot) is 8 % higher than the MOFRC. In addition, the MOFRC, with an ηex and cel of 51.8 % and 6.87 $GJ−1, has a competitive performance compared to the ORC. A comprehensive comparison between the MOFRC and previous configurations based on the flash process indicates that the MOFRC has the highest ηex and lowest cel among the configurations.http://www.sciencedirect.com/science/article/pii/S2214157X2500070XGeothermal heat sourceOrganic flash regenerative cycleOrganic flash cycleScrew expanderComparative analysis |
| spellingShingle | Aboulbaba Eladeb Ali B.M. Ali Pooya Ghodratallah Kuwar Mausam Rahul Thakur Praney Madan Lotfi Ben Said Lioua Kolsi Performance enhancement of organic single-flash cycles by eliminating the throttle valves: A comparative exergy-economic assessment Case Studies in Thermal Engineering Geothermal heat source Organic flash regenerative cycle Organic flash cycle Screw expander Comparative analysis |
| title | Performance enhancement of organic single-flash cycles by eliminating the throttle valves: A comparative exergy-economic assessment |
| title_full | Performance enhancement of organic single-flash cycles by eliminating the throttle valves: A comparative exergy-economic assessment |
| title_fullStr | Performance enhancement of organic single-flash cycles by eliminating the throttle valves: A comparative exergy-economic assessment |
| title_full_unstemmed | Performance enhancement of organic single-flash cycles by eliminating the throttle valves: A comparative exergy-economic assessment |
| title_short | Performance enhancement of organic single-flash cycles by eliminating the throttle valves: A comparative exergy-economic assessment |
| title_sort | performance enhancement of organic single flash cycles by eliminating the throttle valves a comparative exergy economic assessment |
| topic | Geothermal heat source Organic flash regenerative cycle Organic flash cycle Screw expander Comparative analysis |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X2500070X |
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