Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working Fluids
For zeotropic mixtures, the temperature varies during phase change, which is opposed to the isothermal phase change of pure fluids. The use of such mixtures as working fluids in organic Rankine cycle power plants enables a minimization of the mean temperature difference of the heat exchangers, which...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2016-04-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | http://www.mdpi.com/1996-1073/9/5/322 |
| _version_ | 1828146054454837248 |
|---|---|
| author | Jesper G. Andreasen Martin R. Kærn Leonardo Pierobon Ulrik Larsen Fredrik Haglind |
| author_facet | Jesper G. Andreasen Martin R. Kærn Leonardo Pierobon Ulrik Larsen Fredrik Haglind |
| author_sort | Jesper G. Andreasen |
| collection | DOAJ |
| description | For zeotropic mixtures, the temperature varies during phase change, which is opposed to the isothermal phase change of pure fluids. The use of such mixtures as working fluids in organic Rankine cycle power plants enables a minimization of the mean temperature difference of the heat exchangers, which is beneficial for cycle performance. On the other hand, larger heat transfer surface areas are typically required for evaporation and condensation when zeotropic mixtures are used as working fluids. In order to assess the feasibility of using zeotropic mixtures, it is, therefore, important to consider the additional costs of the heat exchangers. In this study, we aim at evaluating the economic feasibility of zeotropic mixtures compared to pure fluids. We carry out a multi-objective optimization of the net power output and the component costs for organic Rankine cycle power plants using low-temperature heat at 90 ∘ C to produce electrical power at around 500 kW. The primary outcomes of the study are Pareto fronts, illustrating the power/cost relations for R32, R134a and R32/R134a (0.65/0.35 mole ). The results indicate that R32/R134a is the best of these fluids, with 3.4 % higher net power than R32 at the same total cost of 1200 k$. |
| first_indexed | 2024-04-11T20:41:28Z |
| format | Article |
| id | doaj.art-329322d428bb419a88cc659e1f2640f7 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T20:41:28Z |
| publishDate | 2016-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-329322d428bb419a88cc659e1f2640f72022-12-22T04:04:11ZengMDPI AGEnergies1996-10732016-04-019532210.3390/en9050322en9050322Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working FluidsJesper G. Andreasen0Martin R. Kærn1Leonardo Pierobon2Ulrik Larsen3Fredrik Haglind4Technical University of Denmark, Building 403, Nils Koppels Allé, DK-2800 Kgs. Lyngby, DenmarkTechnical University of Denmark, Building 403, Nils Koppels Allé, DK-2800 Kgs. Lyngby, DenmarkTechnical University of Denmark, Building 403, Nils Koppels Allé, DK-2800 Kgs. Lyngby, DenmarkDepartment of Shipping and Marine Technology, Chalmers University of Technology, SE-412 96 Gothenburg, SwedenTechnical University of Denmark, Building 403, Nils Koppels Allé, DK-2800 Kgs. Lyngby, DenmarkFor zeotropic mixtures, the temperature varies during phase change, which is opposed to the isothermal phase change of pure fluids. The use of such mixtures as working fluids in organic Rankine cycle power plants enables a minimization of the mean temperature difference of the heat exchangers, which is beneficial for cycle performance. On the other hand, larger heat transfer surface areas are typically required for evaporation and condensation when zeotropic mixtures are used as working fluids. In order to assess the feasibility of using zeotropic mixtures, it is, therefore, important to consider the additional costs of the heat exchangers. In this study, we aim at evaluating the economic feasibility of zeotropic mixtures compared to pure fluids. We carry out a multi-objective optimization of the net power output and the component costs for organic Rankine cycle power plants using low-temperature heat at 90 ∘ C to produce electrical power at around 500 kW. The primary outcomes of the study are Pareto fronts, illustrating the power/cost relations for R32, R134a and R32/R134a (0.65/0.35 mole ). The results indicate that R32/R134a is the best of these fluids, with 3.4 % higher net power than R32 at the same total cost of 1200 k$.http://www.mdpi.com/1996-1073/9/5/322organic Rankine cyclezeotropic mixturemulti-objective optimizationcost estimationheat exchanger designlow temperature heat |
| spellingShingle | Jesper G. Andreasen Martin R. Kærn Leonardo Pierobon Ulrik Larsen Fredrik Haglind Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working Fluids Energies organic Rankine cycle zeotropic mixture multi-objective optimization cost estimation heat exchanger design low temperature heat |
| title | Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working Fluids |
| title_full | Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working Fluids |
| title_fullStr | Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working Fluids |
| title_full_unstemmed | Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working Fluids |
| title_short | Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working Fluids |
| title_sort | multi objective optimization of organic rankine cycle power plants using pure and mixed working fluids |
| topic | organic Rankine cycle zeotropic mixture multi-objective optimization cost estimation heat exchanger design low temperature heat |
| url | http://www.mdpi.com/1996-1073/9/5/322 |
| work_keys_str_mv | AT jespergandreasen multiobjectiveoptimizationoforganicrankinecyclepowerplantsusingpureandmixedworkingfluids AT martinrkærn multiobjectiveoptimizationoforganicrankinecyclepowerplantsusingpureandmixedworkingfluids AT leonardopierobon multiobjectiveoptimizationoforganicrankinecyclepowerplantsusingpureandmixedworkingfluids AT ulriklarsen multiobjectiveoptimizationoforganicrankinecyclepowerplantsusingpureandmixedworkingfluids AT fredrikhaglind multiobjectiveoptimizationoforganicrankinecyclepowerplantsusingpureandmixedworkingfluids |