TY  - Type of reference 
TI  - Optimization of a highly-efficient hydro-CO<sub>2</sub> piston for commercial refrigeration 
AU  - François FARALDO
 
AU  - Philippe LOISEAU
 
AU  - Paul BYRNE 
AB  - This paper presents a novel thermodynamic system developed to generate heat and cold for industrial processes. The efficiency is improved compared to commercialized ones and current state-of-the-art systems. The proposed hydro-CO2 piston combines three counter-intuitive innovations with the operation of discontinuous and slowed thermodynamic cycles where mechanical work is transferred to the refrigeration through a hydraulic circuit based on modified transcritical Carnot and Rankine cycles. This allows to operate unusual thermodynamic transformations such as isothermal compression and two-phase isentropic expansion. The cycles are tailored to the demand and irreversibilities are minimized to make cold/heat generation valorisation highly efficient and cost-effective. This study focuses on the technology energetic efficiency for commercial refrigeration producing negative (-20°C) and positive (0°C) cold. Based on numerical analysis and validated models using numerical tools (EES, Python) and thermodynamic data bases (REFPRP), simulations results compare standard CO2 transcritical cycles (STC) to the hydro-CO2 piston in two different case studies. The results show an increase in COP between 38 and 112% showing the energy efficiency and environmental impact decrease potential of the technology. 
DO  - 10.21494/ISTE.OP.2024.1104 
JF  - Entropy: Thermodynamics – Energy – Environment – Economy  
KW  - CO<sub>2</sub>, thermal energy, MVC, refrigeration, transcritical cycle, isothermal compression, two-phase isentropic expansion, Carnot cycle, Rankine cycle, Lorentz efficiency, CO<sub>2</sub>, energie thermique, CMV, réfrigération, cycle transcritique, compression isotherme, détente pluri-phasique isentropique, cycle de Carnot, cycle de Rankine, rendement de Lorentz,  
L1  - https://openscience.fr/IMG/pdf/iste_entropie24v5n3_4.pdf 
LA  - en 
PB  - ISTE OpenScience 
DA  - 2024/02/28 
SN  - 2634-1476 
TT  - Optimisation d’un piston hydro-CO<sub>2</sub> à haute efficacité pour la réfrigération commerciale 
UR  - https://openscience.fr/Optimization-of-a-highly-efficient-hydro-CO2-piston-for-commercial 
IS  - Special issue IREEC 2 
VL  - 5 
ER  -