RESEARCH ARTICLE
. Thermal Energy System Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yusung-gu, Daejeon 34129, Republic of Korea.. Engine Component Research Team, Korea Aerospace Research Institute (KARI), 169-84 Gwahak-ro, Yusung-gu, Daejeon 34133, Republic of Korea.. InGineers, 21 Saman-ro, 16 Beon-gil, Gimhae-si, Gyeongsangnam-do 621-220, Republic of Korea
录用日期：
2017-10-31
发布日期：
2017-12-14
摘要
Research on applying a supercritical carbon dioxide power cycle (S-CO ) to concentrating solar power (CSP) instead of a steam Rankine cycle or an air Brayton cycle has been recently conducted. An S-CO system is suitable for CSP owing to its compactness, higher efficiency, and dry-cooling capability. At the Korea Institute of Energy Research (KIER), to implement an S-CO system, a 10 kWe class test loop with a turbine-alternator-compressor (TAC) using gas foil bearings was developed. A basic sub-kWe class test loop with a high-speed radial type turbo-generator and a test loop with a capability of tens of kWe with an axial type turbo-generator were then developed. To solve the technical bottleneck of S-CO turbomachinery, a partial admission nozzle and oil-lubrication bearings were used in the turbo-generators. To experience the closed-power cycle and develop an operational strategy of S-CO operated at high pressure, an organic Rankine cycle (ORC) operating test using a refrigerant as the working fluid was conducted owing to its operational capability at relatively low-pressure conditions of approximately 30 to 40 bar. By operating the sub-kWe class test loop using R134a as the working fluid instead of CO , an average turbine power of 400 W was obtained.
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