Effects of ejector geometries on performance of ejector-expansion R410A air conditioner considering cooling seasonal performance factor. (1st November 2017)

• Record Type: Journal Article
• Authors: Jeon, Yongseok; Jung, Jongho; Kim, Dongwoo; Kim, Sunjae; Kim, Yongchan
• Is Part Of: Applied energy. Volume 205(2017)
• Page Start: 761
• Page End: 768
• Publication Date: 2017-11-01
• Subjects: Ejector-expansion air conditioner -- Two-phase ejector -- Optimization -- CSPF; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2017.08.059
• Languages: English
• ISSNs: 0306-2619

Abstract

Highlights: The performance of an ejector-expansion R410A air conditioner is measured. The effect of ejector geometries on the COP and CSPF is analyzed. The mixing-section diameter of the ejector is optimized based on the CSPF. The mixing-section diameter is optimized based on the climatic conditions. Abstract: The objective of this study was to investigate the effects of ejector geometries on the performance of an ejector-expansion air conditioner (EEAC) considering the cooling seasonal performance factor (CSPF). The performance of the EEAC using R410A was measured and analyzed by varying the compressor speed, outdoor-bin temperature, operating pressures, nozzle-throat diameter, and mixing-section diameter. The EEAC in the medium-capacity mode exhibited maximum coefficient of performance (COP) improvement, i.e., 7.5%, over the baseline (conventional) cycle. The optimum mixing-section diameter was determined to be 9 mm based on the CSPF. In addition, the optimum mixing-section diameter increased with an increase in the annual average outdoor temperature. The CSPF of the EEAC with the optimized mixing-section diameter improved in the range of 16.0–20.3% over the baseline cycle depending on the climatic conditions.