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Appl. Sci. 2017, 7(9), 955; doi:10.3390/app7090955

CO2 with Mechanical Subcooling vs. CO2 Cascade Cycles for Medium Temperature Commercial Refrigeration Applications Thermodynamic Analysis

Department of Mechanical Engineering and Construction, Jaume I University, Campus de Riu Sec s/n, Castellón de la Plana, E-12071, Spain
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Received: 24 July 2017 / Revised: 4 September 2017 / Accepted: 11 September 2017 / Published: 16 September 2017
(This article belongs to the Section Mechanical Engineering)
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Abstract

A recent trend to spread the use of CO2 refrigeration cycles in warm regions of the world is to combine a CO2 cycle with another one using a high performance refrigerant. Two alternatives are being considered: cascade and mechanical subcooling systems. Both respond to a similar configuration of the refrigeration cycle, they being based on the use of two compressors and same number of heat exchangers. However, the compressor, heat exchanger sizes and energy performance differ a lot between them. This work, using experimental relations for CO2 and R1234yf semi-hermetic compressors analyzes in depth both alternatives under the warm climate of Spain. In general, it was concluded that the CO2 refrigeration solution with mechanical subcooling would cover all the conditions with high overall energy efficiency, thus it being recommended for further extension of the CO2 refrigeration applications. View Full-Text
Keywords: CO2; transcritical; cascade; mechanical subcooling; energy efficiency CO2; transcritical; cascade; mechanical subcooling; energy efficiency
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Nebot-Andrés, L.; Llopis, R.; Sánchez, D.; Catalán-Gil, J.; Cabello, R. CO2 with Mechanical Subcooling vs. CO2 Cascade Cycles for Medium Temperature Commercial Refrigeration Applications Thermodynamic Analysis. Appl. Sci. 2017, 7, 955.

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