A Cost-Performance Analysis of a Sodium Heat Engine for Distributed Concentrating Solar Power [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 333.79 Energy
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2020
• Mô tả vật lý: Size: Article No. 1900104 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 255607
• Chủ đề: 1. 14 solar energy; 2. 30 direct energy conversion; 3. 42 engineering; 4. Alkali-metal thermal electric converter (amtec); 5. Beta"-alumina solid-electrolyte (base); 6. Combined heat and power; 7. Concentrating solar power; 8. Et al; 9. Thermally regenerative electrochemical system (tres); 10. Thermo- electro-chemical conversion; 11. Water

Tóm tắt

 We present that a sodium thermal electrochemical converter (Na-TEC) generates electricity directly from heat through isothermal expansion of sodium ions across a beta"-alumina solid-electrolyte. This heat engine has been considered for use with conventional concentrating solar power (CSP) systems before. However, unlike previous single-stage devices, the improved design uses two stages with an interstage reheat, allowing more economical and efficient conversion up to 29% at a hot side temperature of 850 �C. Herein, a cost-performance analysis for this improved design assesses opportunities for distributed-CSP in the context of micro-combined heat and power systems. A high-level techno-economic analysis (TEA) is presented that explores four scenarios where a Na-TEC is used as the heat engine for a distributed-CSP system. Overnight capital cost and levelized cost of electricity (LCOE) are estimated for a system lifetime of 30 years, revealing that overnight capital costs in a range from $3.57 to $17.71 per W<
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 . This analysis makes a significant contribution by concurrently quantifying the efficiency and unit costs for a range of multistage configurations, and demonstrating that a Na-TEC may be a promising alternative to Stirling engines for distributed-CSP systems at residential scale of 1?5 kW<
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