Cavity-shaped direct solar steam generator employing conical helical tube for high-temperature application: Model development, experimental testing and numerical analysis
Concentrating solar thermal technologies are drawing more attention since it can substantially contribute to a carbon-neutral society. The solar receivers are essential in this technology to convert solar energy efficiently into thermal energy. Moreover, high-temperature steam generation is the prom...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-04-01
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| Series: | Energy Conversion and Management: X |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590174523000223 |
| _version_ | 1797842769179312128 |
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| author | Yasuki Kadohiro Vamshi Krishna Thanda Bruno Lachmann Kai Risthaus Nathalie Monnerie Martin Roeb Christian Sattler |
| author_facet | Yasuki Kadohiro Vamshi Krishna Thanda Bruno Lachmann Kai Risthaus Nathalie Monnerie Martin Roeb Christian Sattler |
| author_sort | Yasuki Kadohiro |
| collection | DOAJ |
| description | Concentrating solar thermal technologies are drawing more attention since it can substantially contribute to a carbon-neutral society. The solar receivers are essential in this technology to convert solar energy efficiently into thermal energy. Moreover, high-temperature steam generation is the promising application for concentrated solar power plants or industirial processes. Therefore, the direct solar steam generator has been gaining more attention due to its advantages of low operation and maintenance costs. Most solar steam generator designs consist of a tube with helical configuration because of its high heat exchange performance and compactness. However, only few studies address solar steam generators with conical helical tubes. Thus, both experimental and simulation data of this design are scarce. This paper shows the successful development and experimental testing of a solar steam generator with a conical helical tube. The experimental results proved that the developed solar steam generator can produce high-temperature steam of 600 °C at an inlet pressure and mass flow rate of 150–200 kPa and 2.5 kg/h, respectively. The overall calculated energy efficiency (thermal and optical efficiency) was 60–62%. In addition, a coupled 1D-3D numerical model was implemented to analyze the solar steam generator’s performance. The model consists of a 3D cavity heat transfer model and a 1D two-phase fluid flow model. The numerical analysis demonstrated the ideal generator’s performance (energy efficiency of 68–69%) and the great impact of convection in the heat losses (50% of the total energy losses). Although more research of the convection is required, the presented results provide a basis for designing further, upscaled solar steam generators employing conical helical tubes. |
| first_indexed | 2024-04-09T16:53:36Z |
| format | Article |
| id | doaj.art-5adb8cb18d3a4cdd919639b6e6d280c6 |
| institution | Directory Open Access Journal |
| issn | 2590-1745 |
| language | English |
| last_indexed | 2024-04-09T16:53:36Z |
| publishDate | 2023-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Energy Conversion and Management: X |
| spelling | doaj.art-5adb8cb18d3a4cdd919639b6e6d280c62023-04-21T06:46:10ZengElsevierEnergy Conversion and Management: X2590-17452023-04-0118100366Cavity-shaped direct solar steam generator employing conical helical tube for high-temperature application: Model development, experimental testing and numerical analysisYasuki Kadohiro0Vamshi Krishna Thanda1Bruno Lachmann2Kai Risthaus3Nathalie Monnerie4Martin Roeb5Christian Sattler6Deutsches Zentrum für Luft- und Raumfahrt, Institute of Future Fuels, Linder Höhe, 51147 Cologne, Germany; RWTH Aachen University, Chair for Solar Fuel Production, Aachen, Germany; Corresponding author at: Deutsches Zentrum für Luft- und Raumfahrt, Institute of Future Fuels, Linder Höhe, 51147 Cologne, Germany.Deutsches Zentrum für Luft- und Raumfahrt, Institute of Future Fuels, Linder Höhe, 51147 Cologne, GermanyDeutsches Zentrum für Luft- und Raumfahrt, Institute of Future Fuels, Linder Höhe, 51147 Cologne, GermanyDeutsches Zentrum für Luft- und Raumfahrt, Institute of Future Fuels, Linder Höhe, 51147 Cologne, GermanyDeutsches Zentrum für Luft- und Raumfahrt, Institute of Future Fuels, Linder Höhe, 51147 Cologne, GermanyDeutsches Zentrum für Luft- und Raumfahrt, Institute of Future Fuels, Linder Höhe, 51147 Cologne, GermanyDeutsches Zentrum für Luft- und Raumfahrt, Institute of Future Fuels, Linder Höhe, 51147 Cologne, Germany; RWTH Aachen University, Chair for Solar Fuel Production, Aachen, GermanyConcentrating solar thermal technologies are drawing more attention since it can substantially contribute to a carbon-neutral society. The solar receivers are essential in this technology to convert solar energy efficiently into thermal energy. Moreover, high-temperature steam generation is the promising application for concentrated solar power plants or industirial processes. Therefore, the direct solar steam generator has been gaining more attention due to its advantages of low operation and maintenance costs. Most solar steam generator designs consist of a tube with helical configuration because of its high heat exchange performance and compactness. However, only few studies address solar steam generators with conical helical tubes. Thus, both experimental and simulation data of this design are scarce. This paper shows the successful development and experimental testing of a solar steam generator with a conical helical tube. The experimental results proved that the developed solar steam generator can produce high-temperature steam of 600 °C at an inlet pressure and mass flow rate of 150–200 kPa and 2.5 kg/h, respectively. The overall calculated energy efficiency (thermal and optical efficiency) was 60–62%. In addition, a coupled 1D-3D numerical model was implemented to analyze the solar steam generator’s performance. The model consists of a 3D cavity heat transfer model and a 1D two-phase fluid flow model. The numerical analysis demonstrated the ideal generator’s performance (energy efficiency of 68–69%) and the great impact of convection in the heat losses (50% of the total energy losses). Although more research of the convection is required, the presented results provide a basis for designing further, upscaled solar steam generators employing conical helical tubes.http://www.sciencedirect.com/science/article/pii/S2590174523000223Direct steam generationSolar cavity receiverConical helical tubeCoupled 1D–3D numerical model |
| spellingShingle | Yasuki Kadohiro Vamshi Krishna Thanda Bruno Lachmann Kai Risthaus Nathalie Monnerie Martin Roeb Christian Sattler Cavity-shaped direct solar steam generator employing conical helical tube for high-temperature application: Model development, experimental testing and numerical analysis Energy Conversion and Management: X Direct steam generation Solar cavity receiver Conical helical tube Coupled 1D–3D numerical model |
| title | Cavity-shaped direct solar steam generator employing conical helical tube for high-temperature application: Model development, experimental testing and numerical analysis |
| title_full | Cavity-shaped direct solar steam generator employing conical helical tube for high-temperature application: Model development, experimental testing and numerical analysis |
| title_fullStr | Cavity-shaped direct solar steam generator employing conical helical tube for high-temperature application: Model development, experimental testing and numerical analysis |
| title_full_unstemmed | Cavity-shaped direct solar steam generator employing conical helical tube for high-temperature application: Model development, experimental testing and numerical analysis |
| title_short | Cavity-shaped direct solar steam generator employing conical helical tube for high-temperature application: Model development, experimental testing and numerical analysis |
| title_sort | cavity shaped direct solar steam generator employing conical helical tube for high temperature application model development experimental testing and numerical analysis |
| topic | Direct steam generation Solar cavity receiver Conical helical tube Coupled 1D–3D numerical model |
| url | http://www.sciencedirect.com/science/article/pii/S2590174523000223 |
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