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안윤한(Yoonhan Ahn),차재은(Jae Eun Cha),서한(Han Seo),이선일(Sunil Lee),정흥준(Heung June Chung) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
As the global climate change becomes substantial, desire to improve power system efficiency increases gradually. Power generation by utilizing the waste heat of gas turbine exhaust flow is another increasing market. Supercritical CO₂ cycle is gaining interests with several benefits: (1) high efficiency in the mild turbine inlet temperature range (450-650℃), (2) simple layout configuration and (3) small foot print coupled with compact heat exchangers and turbomachineries. On and off-design performance of supercritical CO₂ power system based on the component design variables is discussed in this paper. Preliminary design of supercritical CO₂ recuperated layout to make use of the waste heat from gas turbine (LM-2500) exhaust flow is designed and the corresponding turbomachineries and heat exchangers are designed. The compressor inlet condition is designed close to the critical point to improve system efficiency due to low compression work. Printed Circuit Heat Exchangers (PCHE) are designed for the S-CO₂ system because it can operate under high temperature and pressure condition. Radial turbomachineries design parameter and performance maps are generated from in-house code. Based on preliminary component design parameters, off-design performance is analyzed for the condition of cooling water temperature change. As cooling temperature increases, overall system mass flow rate and turbine power decreases, while the compression work increases.