Journal
APPLIED ENERGY
Volume 195, Issue -, Pages 137-151Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2017.03.033
Keywords
Solar thermal power generation; Screw expander; Thermal storage; Steam accumulator; Part-load behavior
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Funding
- National Science Foundation of China [51476159, 51378483, 51206154]
- EU Marie Curie International Incoming Fellowships Program [703746]
- Anhui Provincial Natural Science Foundation [1608085QE96]
- Dongguan Innovative Research Team Program [2014607101008]
- Marie Curie Actions (MSCA) [703746] Funding Source: Marie Curie Actions (MSCA)
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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 (T-H) of SORC generally does not exceed 250 degrees C to achieve an optimum solar thermal power efficiency. Given radiation of 750 W/m(2), the maximum efficiency (eta(T,m)) is 14.3% with a corresponding T-H around 240 degrees C. The material cost of pressure vessels is 2.55 million RMB. For the indirect system, the optimal T-H is about 230 degrees C and eta(T,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. (C) 2017 Elsevier Ltd. All rights reserved.
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