Carbon Dioxide Mixtures as Working Fluid for High-Temperature Heat Recovery: A Thermodynamic Comparison with Transcritical Organic Rankine Cycles
| Autor: | Giampaolo Manzolini, Paolo Iora, Costante Mario Invernizzi, Abubakr Ayub, Gioele Di Marcoberardino |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Control and Optimization
Materials science Transcritical cycles Fluid mixtures 020209 energy Energy Engineering and Power Technology Thermodynamics Carbon dioxide Organic rankine cycles Waste heat recovery 02 engineering and technology lcsh:Technology 7. Clean energy Waste heat recovery unit transcritical cycles waste heat recovery fluid mixtures carbon dioxide Organic Rankine Cycles 020401 chemical engineering Heat recovery ventilation Thermodynamic cycle Waste heat 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering Electrical and Electronic Engineering Engineering (miscellaneous) Physics::Atmospheric and Oceanic Physics Degree Rankine Supercritical carbon dioxide lcsh:T Renewable Energy Sustainability and the Environment Supercritical fluid 13. Climate action Working fluid Energy (miscellaneous) |
| Zdroj: | Energies; Volume 13; Issue 15; Pages: 4014 Energies, Vol 13, Iss 4014, p 4014 (2020) |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en13154014 |
| Popis: | This study aims to provide a thermodynamic comparison between supercritical CO2 cycles and ORC cycles utilizing flue gases as waste heat source. Moreover, the possibility of using CO2 mixtures as working fluids in transcritical cycles to enhance the performance of the thermodynamic cycle is explored. ORCs operating with pure working fluids show higher cyclic thermal and total efficiencies compared to supercritical CO2 cycles; thus, they represent a better option for high-temperature waste heat recovery provided that the thermal stability at a higher temperature has been assessed. Based on the improved global thermodynamic performance and good thermal stability of R134a, CO2-R134a is investigated as an illustrative, promising working fluid mixture for transcritical power cycles. The results show that a total efficiency of 0.1476 is obtained for the CO2-R134a mixture (0.3 mole fraction of R134a) at a maximum cycle pressure of 200 bars, which is 15.86% higher than the supercritical carbon dioxide cycle efficiency of 0.1274, obtained at the comparatively high maximum pressure of 300 bars. Steam cycles, owing to their larger number of required turbine stages and lower power output, did not prove to be a suitable option in this application. |
| Databáze: | OpenAIRE |
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