Performance evaluation and discharge pressure discu of supermarket CO2 refrigeration system integrated with ejector subcooling using solar energy

Key Words:MULTI-EJECTOR; THERMODYNAMIC ANALYSIS; CYCLES; PLANT

Abstract:To further enhance the applicability of the supermarket CO2 refrigeration system in warm or hot climates, a supermarket CO2 refrigeration system integrated with ejector subcooling using solar energy (SCRS-ES) is proposed and the thermodynamic model is established. A parametric analysis has been conducted on the proposed cycle under ying operating conditions, and the impact of operational parameters on its performance has been discussed. The key operation parameter of discharge pressure is compared analyzed in detail. The results indicate that there exists optimal discharge pressure (Pdis,opt) and subcooling degree (TSub,opt) that enable the hybrid system to achieve a maximum COPm, while the system requires a relatively large collector area (ACol). When the ambient temperature is 30-40 degrees C and subcooling degree is 10 degrees C, the system is operated at the optimal discharge pressure corresponding to the supermarket CO2 refrigeration system (SCRS) (Popt,SCRS), the COPm,max is decreased by 8.11-14.98 % compared to that at Pdis,opt, but ACol is significantly decreased by 63.7-68.75 %. Meanwhile, the performance is still improved by 15.56-20.29 % compared to the SCRS. Therefore, this hybrid system can be operated with optimal discharge pressure of SCRS. The findings of this research may provide the reference for further optimization and application of the hybrid system.

Volume:172

Issue:-

Translation or Not:no