Thermodynamic and economic investigation of a screw expander-based direct steam generation solar cascade Rankine cycle system using water as thermal storage fluid
Solar electricity generation system (SEGS) which employs cascade steam-organic Rankine cycle (SORC) and steam screw expander (SE) is promising due to the high efficiency at moderate heat source temperature. This paper puts a special emphasis on heat storage and thermo-economic evaluation. Preferable...
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| Format: | Article |
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Elsevier
2017
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| Online Access: | https://eprints.nottingham.ac.uk/42668/ |
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| author | Li, Jing Li, Pengcheng Gao, Guangtao Pei, Gang Su, Yuehong Ji, Jie |
| author_facet | Li, Jing Li, Pengcheng Gao, Guangtao Pei, Gang Su, Yuehong Ji, Jie |
| author_sort | Li, Jing |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Solar electricity generation system (SEGS) which employs cascade steam-organic Rankine cycle (SORC) and steam screw expander (SE) is promising due to the high efficiency at moderate heat source temperature. This paper puts a special emphasis on heat storage and thermo-economic evaluation. Preferable operating temperature of the system is first clarified on the basis of SE characteristics. The temperature-dependent permissible stress of steam accumulator is modelled and the capital cost is investigated. Comparison between the direct steam generation (DSG) SEGS and an indirect one using thermal oil is made at a power capacity of 1 MW and storage of 6.5 h. The results indicate the DSG system has both thermodynamic and economic superiorities. The hot side temperature (THTH) of SORC generally does not exceed 250 °C to achieve an optimum solar thermal power efficiency. Given radiation of 750 W/m2, the maximum efficiency (ηT,mηT,m) is 14.3% with a corresponding THTH around 240 °C. The material cost of pressure vessels is 2.55 million RMB. For the indirect system, the optimal THTH is about 230 °C and ηT,mηT,m approximates to 13.2% and the estimated oil cost is 7.92 million RMB. It is recommended to adopt steam accumulators in the SE-driven SEGS. |
| first_indexed | 2025-11-14T19:49:37Z |
| format | Article |
| id | nottingham-42668 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:49:37Z |
| publishDate | 2017 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-426682020-05-04T18:48:03Z https://eprints.nottingham.ac.uk/42668/ Thermodynamic and economic investigation of a screw expander-based direct steam generation solar cascade Rankine cycle system using water as thermal storage fluid Li, Jing Li, Pengcheng Gao, Guangtao Pei, Gang Su, Yuehong Ji, Jie Solar electricity generation system (SEGS) which employs cascade steam-organic Rankine cycle (SORC) and steam screw expander (SE) is promising due to the high efficiency at moderate heat source temperature. This paper puts a special emphasis on heat storage and thermo-economic evaluation. Preferable operating temperature of the system is first clarified on the basis of SE characteristics. The temperature-dependent permissible stress of steam accumulator is modelled and the capital cost is investigated. Comparison between the direct steam generation (DSG) SEGS and an indirect one using thermal oil is made at a power capacity of 1 MW and storage of 6.5 h. The results indicate the DSG system has both thermodynamic and economic superiorities. The hot side temperature (THTH) of SORC generally does not exceed 250 °C to achieve an optimum solar thermal power efficiency. Given radiation of 750 W/m2, the maximum efficiency (ηT,mηT,m) is 14.3% with a corresponding THTH around 240 °C. The material cost of pressure vessels is 2.55 million RMB. For the indirect system, the optimal THTH is about 230 °C and ηT,mηT,m approximates to 13.2% and the estimated oil cost is 7.92 million RMB. It is recommended to adopt steam accumulators in the SE-driven SEGS. Elsevier 2017-06-01 Article PeerReviewed Li, Jing, Li, Pengcheng, Gao, Guangtao, Pei, Gang, Su, Yuehong and Ji, Jie (2017) Thermodynamic and economic investigation of a screw expander-based direct steam generation solar cascade Rankine cycle system using water as thermal storage fluid. Applied Energy, 195 . pp. 137-151. ISSN 0306-2619 Solar thermal power generation; Screw expander; Thermal storage; Steam accumulator; Part-load behavior http://www.sciencedirect.com/science/article/pii/S0306261917302568 doi:10.1016/j.apenergy.2017.03.033 doi:10.1016/j.apenergy.2017.03.033 |
| spellingShingle | Solar thermal power generation; Screw expander; Thermal storage; Steam accumulator; Part-load behavior Li, Jing Li, Pengcheng Gao, Guangtao Pei, Gang Su, Yuehong Ji, Jie Thermodynamic and economic investigation of a screw expander-based direct steam generation solar cascade Rankine cycle system using water as thermal storage fluid |
| title | Thermodynamic and economic investigation of a screw expander-based direct steam generation solar cascade Rankine cycle system using water as thermal storage fluid |
| title_full | Thermodynamic and economic investigation of a screw expander-based direct steam generation solar cascade Rankine cycle system using water as thermal storage fluid |
| title_fullStr | Thermodynamic and economic investigation of a screw expander-based direct steam generation solar cascade Rankine cycle system using water as thermal storage fluid |
| title_full_unstemmed | Thermodynamic and economic investigation of a screw expander-based direct steam generation solar cascade Rankine cycle system using water as thermal storage fluid |
| title_short | Thermodynamic and economic investigation of a screw expander-based direct steam generation solar cascade Rankine cycle system using water as thermal storage fluid |
| title_sort | thermodynamic and economic investigation of a screw expander-based direct steam generation solar cascade rankine cycle system using water as thermal storage fluid |
| topic | Solar thermal power generation; Screw expander; Thermal storage; Steam accumulator; Part-load behavior |
| url | https://eprints.nottingham.ac.uk/42668/ https://eprints.nottingham.ac.uk/42668/ https://eprints.nottingham.ac.uk/42668/ |