Thermodynamic Analysis of a Novel Dual-Ejector Multi-Compressor Transcritical-CO2 Refrigeration System for Supermarket Applications in Warm Climates

Abstract

The thermodynamic analysis of a novel dual-ejector multistage compressor-based transcritical CO2 booster system for supermarket application in warm climatic conditions is presented in this paper. Dual-ejector flow-pressurization and flow-splitting at higher ambient temperatures are implemented to improve performance. The proposed system is compared with various previously published CO2 systems including B1 (Standard CO2 booster system), B2 (CO2 booster system with parallel compression), B3 (CO2 booster system with flooded LT evaporator), B4 (CO2 booster system with work recovery expander), B5 (CO2 booster system with parallel compression, flooded LT evaporator, work recovery expander) and also with multi-stage ejector systems. The performance of the proposed system is found superior. The COP of the proposed system has been found to be 32% higher than B5 and 26% higher than the multi-ejector systems.