Solar Hydrogen Production via a Samarium Oxide-Based Thermochemical Water Splitting Cycle
The computational thermodynamic analysis of a samarium oxide-based two-step solar thermochemical water splitting cycle is reported. The analysis is performed using HSC chemistry software and databases. The first (solar-based) step drives the thermal reduction of Sm2O3 into Sm and O2. The second (non...
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MDPI AG
2016-04-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/9/5/316 |
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| author | Rahul Bhosale Anand Kumar Fares AlMomani Ujjal Ghosh Mohammad Saad Anis Konstantinos Kakosimos Rajesh Shende Marc A. Rosen |
| author_facet | Rahul Bhosale Anand Kumar Fares AlMomani Ujjal Ghosh Mohammad Saad Anis Konstantinos Kakosimos Rajesh Shende Marc A. Rosen |
| author_sort | Rahul Bhosale |
| collection | DOAJ |
| description | The computational thermodynamic analysis of a samarium oxide-based two-step solar thermochemical water splitting cycle is reported. The analysis is performed using HSC chemistry software and databases. The first (solar-based) step drives the thermal reduction of Sm2O3 into Sm and O2. The second (non-solar) step corresponds to the production of H2 via a water splitting reaction and the oxidation of Sm to Sm2O3. The equilibrium thermodynamic compositions related to the thermal reduction and water splitting steps are determined. The effect of oxygen partial pressure in the inert flushing gas on the thermal reduction temperature (TH) is examined. An analysis based on the second law of thermodynamics is performed to determine the cycle efficiency (ηcycle) and solar-to-fuel energy conversion efficiency (ηsolar−to−fuel) attainable with and without heat recuperation. The results indicate that ηcycle and ηsolar−to−fuel both increase with decreasing TH, due to the reduction in oxygen partial pressure in the inert flushing gas. Furthermore, the recuperation of heat for the operation of the cycle significantly improves the solar reactor efficiency. For instance, in the case where TH = 2280 K, ηcycle = 24.4% and ηsolar−to−fuel = 29.5% (without heat recuperation), while ηcycle = 31.3% and ηsolar−to−fuel = 37.8% (with 40% heat recuperation). |
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| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-13T09:16:00Z |
| publishDate | 2016-04-01 |
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| series | Energies |
| spelling | doaj.art-c6c579ff51104c6eb2042caf15565b462022-12-22T02:52:44ZengMDPI AGEnergies1996-10732016-04-019531610.3390/en9050316en9050316Solar Hydrogen Production via a Samarium Oxide-Based Thermochemical Water Splitting CycleRahul Bhosale0Anand Kumar1Fares AlMomani2Ujjal Ghosh3Mohammad Saad Anis4Konstantinos Kakosimos5Rajesh Shende6Marc A. Rosen7Department of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha 2713, QatarDepartment of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha 2713, QatarDepartment of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha 2713, QatarDepartment of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha 2713, QatarDepartment of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha 2713, QatarDepartment of Chemical Engineering, Texas A&M University at Qatar, PO Box 23874, Doha 2713, QatarDepartment of Chemical and Biological Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701-3995, USAFaculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe St. North, Oshawa, ON L1H 7K4, CanadaThe computational thermodynamic analysis of a samarium oxide-based two-step solar thermochemical water splitting cycle is reported. The analysis is performed using HSC chemistry software and databases. The first (solar-based) step drives the thermal reduction of Sm2O3 into Sm and O2. The second (non-solar) step corresponds to the production of H2 via a water splitting reaction and the oxidation of Sm to Sm2O3. The equilibrium thermodynamic compositions related to the thermal reduction and water splitting steps are determined. The effect of oxygen partial pressure in the inert flushing gas on the thermal reduction temperature (TH) is examined. An analysis based on the second law of thermodynamics is performed to determine the cycle efficiency (ηcycle) and solar-to-fuel energy conversion efficiency (ηsolar−to−fuel) attainable with and without heat recuperation. The results indicate that ηcycle and ηsolar−to−fuel both increase with decreasing TH, due to the reduction in oxygen partial pressure in the inert flushing gas. Furthermore, the recuperation of heat for the operation of the cycle significantly improves the solar reactor efficiency. For instance, in the case where TH = 2280 K, ηcycle = 24.4% and ηsolar−to−fuel = 29.5% (without heat recuperation), while ηcycle = 31.3% and ηsolar−to−fuel = 37.8% (with 40% heat recuperation).http://www.mdpi.com/1996-1073/9/5/316solar thermochemicalthermodynamicshydrogenwater splittingsamarium oxidecomputational analysis |
| spellingShingle | Rahul Bhosale Anand Kumar Fares AlMomani Ujjal Ghosh Mohammad Saad Anis Konstantinos Kakosimos Rajesh Shende Marc A. Rosen Solar Hydrogen Production via a Samarium Oxide-Based Thermochemical Water Splitting Cycle Energies solar thermochemical thermodynamics hydrogen water splitting samarium oxide computational analysis |
| title | Solar Hydrogen Production via a Samarium Oxide-Based Thermochemical Water Splitting Cycle |
| title_full | Solar Hydrogen Production via a Samarium Oxide-Based Thermochemical Water Splitting Cycle |
| title_fullStr | Solar Hydrogen Production via a Samarium Oxide-Based Thermochemical Water Splitting Cycle |
| title_full_unstemmed | Solar Hydrogen Production via a Samarium Oxide-Based Thermochemical Water Splitting Cycle |
| title_short | Solar Hydrogen Production via a Samarium Oxide-Based Thermochemical Water Splitting Cycle |
| title_sort | solar hydrogen production via a samarium oxide based thermochemical water splitting cycle |
| topic | solar thermochemical thermodynamics hydrogen water splitting samarium oxide computational analysis |
| url | http://www.mdpi.com/1996-1073/9/5/316 |
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