Improvements in CO 2 Booster Architectures with Different Economizer Arrangements

J. Catalán-Gil, L. Nebot-Andrés, D. Sánchez, R. Llopis, R. Cabello and D. Calleja-Anta
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J. Catalán-Gil: Dep. of Mechanical Engineering and Construction, Jaume I University, Campus de Riu Sec s/n, E-12071, Castellón, Spain
L. Nebot-Andrés: Dep. of Mechanical Engineering and Construction, Jaume I University, Campus de Riu Sec s/n, E-12071, Castellón, Spain
D. Sánchez: Dep. of Mechanical Engineering and Construction, Jaume I University, Campus de Riu Sec s/n, E-12071, Castellón, Spain
R. Llopis: Dep. of Mechanical Engineering and Construction, Jaume I University, Campus de Riu Sec s/n, E-12071, Castellón, Spain
R. Cabello: Dep. of Mechanical Engineering and Construction, Jaume I University, Campus de Riu Sec s/n, E-12071, Castellón, Spain
D. Calleja-Anta: Dep. of Mechanical Engineering and Construction, Jaume I University, Campus de Riu Sec s/n, E-12071, Castellón, Spain

Energies, 2020, vol. 13, issue 5, 1-29

Abstract: CO 2 transcritical booster architectures are widely analyzed to be applied in centralized commercial refrigeration plants in consonance with the irrevocable phase-out of HFCs. Most of these analyses show the limitations of CO 2 cycles in terms of energy efficiency, especially in warm countries. From the literature, several improvements have been proposed to raise the booster efficiency in high ambient temperatures. The use of economizers is an interesting technique to reduce the temperature after the gas cooler and to improve the energy efficiency of transcritical CO 2 cycles. The economizer cools down the high pressure’s line of CO 2 by evaporating the same refrigerant extracted from another point of the facility. Depending on the extraction point, some configurations are possible. In this work, different booster architectures with economizers have been analyzed and compared. From the results, the combination of the economizer with the additional compressor allows obtaining energy savings of up to 8.5% in warm countries and up to 4% in cold countries with regard to the flash-by-pass arrangement and reduce the volumetric displacement required of the MT compressors by up to 37%.

Keywords: CO 2 transcritical booster; economizer; subcooling; commercial refrigeration; integrated mechanical subcooling; variable frequency drive (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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