Heat-transfer enhancement coupled with density-difference separation: a novel sub-critical heat-rejection process for sCO2 cycles

2026-08-10

PRE

Enhui Sun *

Bin Li

Zhenyu Leng

Qinchai Chen

Jinliang Xu

Yifan Zhang

Wenfeng Fu

DOI：10.1016/j.applthermaleng.2026.132693

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Abstract

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• A novel sub-critical heat-rejection process using mixed-flow heat transfer for sCO2 cycles is proposed for sCO2 cycles. • Direct-contact cooling between CO2 and water transforms heat rejection into near-isothermal. • Replacing supercritical compression with liquid-phase pumping reduces work and improves efficiency. • The cycle increases thermal efficiency from 47.59% to 49.86% and reduces mass flow by 15.62% for the same power output.

Keywords:

Supercritical CO2 cycle

Mixed-flow heat transfer

Density-difference separation

Mutual solubility

Liquid-phase compression

Heat-transfer enhancement coupled with density-difference separation: a novel sub-critical heat-rejection process for sCO2 cycles

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