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Cycle-Model Assessment of Working Fluids for a Low-Pressure CO2 Climate Control System
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 06, 2000 by SAE International in United States
Annotation ability available
Event: SAE 2000 World Congress
A low-pressure CO2-based climate-control system has the environmental benefits of CO2 refrigerant but avoids the extremely high pressures of the transcritical CO2 cycle. In the new cycle, a liquid “cofluid” is circulated in tandem with the CO2, with absorption and desorption of CO2 from solution replacing condensation/gas cooling and evaporation of pure CO2. This work compares the theoretical performance of the cycle using two candidate cofluids: N-methyl-2-pyrrolidone and acetone. The optimal coefficient of performance (COP) and refrigeration capacity are discussed in terms of characteristics of the CO2-cofluid mixture. Thermodynamic functions are determined either from an activity coefficient model or using the Soave equation of state, with close agreement between the two approaches. Reductions in COP due to nonideal compressor and heat exchangers are also estimated.
|Technical Paper||Thermodynamic and Cycle Models for a Low-Pressure CO2 Refrigeration Cycle|
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CitationMozurkewich, G., Roberts, R., Greenfield, M., Schneider, W. et al., "Cycle-Model Assessment of Working Fluids for a Low-Pressure CO2 Climate Control System," SAE Technical Paper 2000-01-0578, 2000, https://doi.org/10.4271/2000-01-0578.
SAE 2000 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V109-6 ; Published: 2001-09-15
Number: V109-6 ; Published: 2001-09-15
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