Effects of Cold Temperature and Main Compressor Intercooling on Recuperator and Recompression Cycle Performance

Conference · Thu Aug 30 04:00:00 EDT 2018

DOI:https://doi.org/10.17185/duepublico/46085· OSTI ID:1491117

Weiland, Nathan ^[1]; White, Chuck ^[2]; O'Connell, Drew ^[2]

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1. NETL
2. KeyLogic Systems, LLC

<span>This study investigates the effects of cold supercritical CO2 (sCO2) temperatures, compressor inlet pressures, and main compressor intercooling on the efficiency and specific power of recompression sCO2 cycles. Reducing the cold sCO2 temperature increases the compressor inlet density, thus reducing required compression power and increasing cycle thermal efficiency. &nbsp;Similarly, main compressor intercooling improves the specific power of a recompression cycle, reducing sCO2 mass flow, cycle size and cost for a given power output, though it is also shown to lead to an internal pinch point in the low temperature recuperator. Strategies for remediation of internal pinch points for recuperators as well as for the main CO2 cooler and the flue gas cooler are discussed, and apply to recompression cycles for all sCO2 applications.&nbsp; Upfront consideration of these remediation strategies is essential to determine attainable sCO2 cycle operating conditions and component sizing requirements.</span>

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
• Sponsoring Organization: (FE-22) - FE-22
• DOE Contract Number: FE0025912
• OSTI ID: 1491117
• Report Number(s): NETL-PUB-21819
• Country of Publication: Germany
• Language: English