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Transcritical or supercritical CO2 cycles using both low- and high-temperature heat sources

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  • Kim, Y.M.
  • Kim, C.G.
  • Favrat, D.

Abstract

In CO2 cycles with high-temperature heat sources that are used in applications such as nuclear power, concentrated solar power, and combustion, partial condensation transcritical CO2 (T-CO2) cycles or recompression supercritical CO2 (S-CO2) cycles are considered to be promising cycles; this is because these cycles cause a reduction in the large internal irreversibility in the recuperator owing to the higher specific heat of the high-pressure side than that of the low-pressure side. However, if heat is available in the low-temperature range, the T-CO2 Rankine cycles (or fully-cooled S-CO2 cycles) will be more effective than the T-CO2 Brayton cycles (or less-cooled S-CO2 cycles) and even than the partial condensation T-CO2 cycles (or recompression S-CO2 cycles). This is because the compression work is reduced while achieving the same temperature rise by heat recovery through the recuperator before the high-temperature heater.

Suggested Citation

  • Kim, Y.M. & Kim, C.G. & Favrat, D., 2012. "Transcritical or supercritical CO2 cycles using both low- and high-temperature heat sources," Energy, Elsevier, vol. 43(1), pages 402-415.
    • Handle: RePEc:eee:energy:v:43:y:2012:i:1:p:402-415
    DOI: 10.1016/j.energy.2012.03.076
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    References listed on IDEAS

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