Title: Energy and exergy analyses of a novel transcritical CO₂ booster refrigeration system with internal subcooling for supermarket

Authors: Xuyang Cui; Yunzhe Zhang; Junlan Yang

Addresses: School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin, 300384, China ' School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin, 300384, China ' School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin, 300384, China

Abstract: In order to optimise supermarket refrigeration systems, a novel transcritical CO₂ system was developed. Simulation results indicate that under high-temperature conditions, the optimal discharge pressure ranges from 9-11 MPa, corresponding to the best COP value of 2-2.4, while receiver pressures above 5 MPa reduce COP by 3.7-4.7%. Advanced exergy analysis reveals the high-pressure compressor has the highest avoidable exergy destruction (12.05 kW at 30°C), followed by the gas cooler and medium-temperature evaporator, indicating significant optimisation potential.

Keywords: transcritical CO₂ booster refrigeration system; internal subcooling; coefficient of performance; COP; advanced exergy analysis.

DOI: 10.1504/IJEX.2026.152939

International Journal of Exergy, 2026 Vol.49 No.4, pp.281 - 298

Received: 15 Jul 2025
Accepted: 02 Nov 2025
Published online: 15 Apr 2026 *

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