Comparison of Supercritical Carbon Dioxide Power Cycle Configurations with an Emphasis on CSP Applications

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Abstract

Recent research suggests that an emerging power cycle technology using supercritical carbon dioxide (s-CO2) operated in a closed-loop Brayton cycle offers the potential of equivalent or higher cycle efficiency versus supercritical or superheated steam cycles at temperatures relevant for CSP applications. Preliminary design-point modeling suggests that s-CO2 cycle configurations can be devised that have similar overall efficiency but different temperature and/or pressure characteristics. This paper employs a more detailed heat exchanger model than previous work to compare the recompression and partial cooling cycles, two cycles with high design-point efficiencies, and illustrates the potential advantages of the latter. Integration of the cycles into CSP systems is studied, with a focus on sensible heat thermal storage and direct s-CO2 receivers. Results show the partial cooling cycle may offer a larger temperature difference across the primary heat exchanger, thereby potentially reducing heat exchanger cost and improving CSP receiver efficiency.

Original languageAmerican English
Pages1187-1196
Number of pages10
DOIs
StatePublished - 2014
EventInternational Conference on Solar Power and Chemical Energy Systems, SolarPACES 2013 - Las Vegas, NV, United States
Duration: 17 Sep 201320 Sep 2013

Conference

ConferenceInternational Conference on Solar Power and Chemical Energy Systems, SolarPACES 2013
Country/TerritoryUnited States
CityLas Vegas, NV
Period17/09/1320/09/13

NREL Publication Number

  • NREL/CP-5500-61644

Keywords

  • CSP
  • Partial cooling
  • Recompression
  • Supercritical carbon dioxide power cycle

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