Performance optimization of an R410A air-conditioner with a dual evaporator ejector cycle based on cooling seasonal performance factor

Highlights: • The performance of an R410A air-conditioner adopting a DEEC. • The effects of operating parameters on the COP and CSPF. • Optimized mixing section diameter of the ejector. • The maximum limit of the entrainment ratio (ER). - Abstract: Even though a dual evaporator ejector cycle (DEEC) offers several advantages over a standard two-phase ejector cycle, few experimental investigations of the performance of the DEEC are available in the literature. This study presents the performance characteristics of an R410A air-conditioner adopted with a DEEC under various operating conditions and ejector geometries. The COP of the DEEC decreased with an increase in entrainment ratio (ER) due to the decrease in pressure lifting ratio. For the optimum ER, the effectiveness of the DEEC increased with an increase in compressor speed with a larger total mass flow rate. The optimum mixing section diameter was determined to be 5 mm based on the cooling seasonal performance factor (CSPF) and CSPF_bin of the DEEC. The maximum allowable limit for the ER was also suggested to be 0.3. In addition, the CSPF of the DEEC was 6.3% higher than that of the baseline cycle at an ER of 0.1.