Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Through the Use of Regeneration
In the present study, a subcritical and supercritical regenerative organic Rankine cycle (rORC) was designed. The designed rORCs assist a combined heat and power (CHP) engine, the fuel of which is biogas produced from anaerobic digestion of domestic wastes in Belgium. R245fa was selected as the work...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2019-02-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/12/4/575 |
| _version_ | 1811304043134320640 |
|---|---|
| author | Yıldız Koç Hüseyin Yağlı Ali Koç |
| author_facet | Yıldız Koç Hüseyin Yağlı Ali Koç |
| author_sort | Yıldız Koç |
| collection | DOAJ |
| description | In the present study, a subcritical and supercritical regenerative organic Rankine cycle (rORC) was designed. The designed rORCs assist a combined heat and power (CHP) engine, the fuel of which is biogas produced from anaerobic digestion of domestic wastes in Belgium. R245fa was selected as the working fluid for both the subcritical and supercritical rORC. During the parametric optimisation, the net power production, mass flow rate, exchanged heat in the regenerator, total pump power consumption, thermal and exergetic efficiencies of rORC were calculated for varying turbine inlet temperatures and pressures. After parametric optimisation of the rORC, the results were compared with the results of the previous study, in which only a simple ORC is analysed and parametrically optimised. Moreover, the effect of the regenerator was revealed by examining all results together. Finally, the exergetic analysis of the best performing subcritical and supercritical rORC was performed. Furthermore, the results of the present and previous studies were considered together and it is clearly seen that the subcritical rORC shows the best performance. Consequently, by using the subcritical rORC, the disadvantages of the using simple ORC (low performance) and supercritical cycle (safety, investment) can be eliminated and system performance can be improved. |
| first_indexed | 2024-04-13T07:59:55Z |
| format | Article |
| id | doaj.art-3b05ade02cf141b5843b962894fab96e |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-13T07:59:55Z |
| publishDate | 2019-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-3b05ade02cf141b5843b962894fab96e2022-12-22T02:55:18ZengMDPI AGEnergies1996-10732019-02-0112457510.3390/en12040575en12040575Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Through the Use of RegenerationYıldız Koç0Hüseyin Yağlı1Ali Koç2Department of Mechanical Engineering, Iskenderun Technical University, Hatay 31200, TurkeyDepartment of Mechanical Engineering, Iskenderun Technical University, Hatay 31200, TurkeyDepartment of Mechanical Engineering, Iskenderun Technical University, Hatay 31200, TurkeyIn the present study, a subcritical and supercritical regenerative organic Rankine cycle (rORC) was designed. The designed rORCs assist a combined heat and power (CHP) engine, the fuel of which is biogas produced from anaerobic digestion of domestic wastes in Belgium. R245fa was selected as the working fluid for both the subcritical and supercritical rORC. During the parametric optimisation, the net power production, mass flow rate, exchanged heat in the regenerator, total pump power consumption, thermal and exergetic efficiencies of rORC were calculated for varying turbine inlet temperatures and pressures. After parametric optimisation of the rORC, the results were compared with the results of the previous study, in which only a simple ORC is analysed and parametrically optimised. Moreover, the effect of the regenerator was revealed by examining all results together. Finally, the exergetic analysis of the best performing subcritical and supercritical rORC was performed. Furthermore, the results of the present and previous studies were considered together and it is clearly seen that the subcritical rORC shows the best performance. Consequently, by using the subcritical rORC, the disadvantages of the using simple ORC (low performance) and supercritical cycle (safety, investment) can be eliminated and system performance can be improved.https://www.mdpi.com/1996-1073/12/4/575combined heat and power (CHP)regenerative organic Rankine cycle (rORC)the effect of the regeneratorexhaust gassubcriticalsupercriticalparametric optimizationexergy |
| spellingShingle | Yıldız Koç Hüseyin Yağlı Ali Koç Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Through the Use of Regeneration Energies combined heat and power (CHP) regenerative organic Rankine cycle (rORC) the effect of the regenerator exhaust gas subcritical supercritical parametric optimization exergy |
| title | Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Through the Use of Regeneration |
| title_full | Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Through the Use of Regeneration |
| title_fullStr | Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Through the Use of Regeneration |
| title_full_unstemmed | Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Through the Use of Regeneration |
| title_short | Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Through the Use of Regeneration |
| title_sort | exergy analysis and performance improvement of a subcritical supercritical organic rankine cycle orc for exhaust gas waste heat recovery in a biogas fuelled combined heat and power chp engine through the use of regeneration |
| topic | combined heat and power (CHP) regenerative organic Rankine cycle (rORC) the effect of the regenerator exhaust gas subcritical supercritical parametric optimization exergy |
| url | https://www.mdpi.com/1996-1073/12/4/575 |
| work_keys_str_mv | AT yıldızkoc exergyanalysisandperformanceimprovementofasubcriticalsupercriticalorganicrankinecycleorcforexhaustgaswasteheatrecoveryinabiogasfuelledcombinedheatandpowerchpenginethroughtheuseofregeneration AT huseyinyaglı exergyanalysisandperformanceimprovementofasubcriticalsupercriticalorganicrankinecycleorcforexhaustgaswasteheatrecoveryinabiogasfuelledcombinedheatandpowerchpenginethroughtheuseofregeneration AT alikoc exergyanalysisandperformanceimprovementofasubcriticalsupercriticalorganicrankinecycleorcforexhaustgaswasteheatrecoveryinabiogasfuelledcombinedheatandpowerchpenginethroughtheuseofregeneration |