Fundamental Aspects of the Application of Carbon Dioxide in Comfort Cooling.
Fundamental Aspects of the Application of Carbon Dioxide
in Comfort Cooling.
Brown, J. S.; Domanski, P. A.
Refrigeration International Congress, 21st IIR.
(IRC2003).Technical Session: B1-9 - A New Old
Refrigerant: Carbon Dioxide - Components and Systems I.
Proceedings. August 17-22, 2003, Washington, DC, 2004.
carbon dioxide; comfort; cooling; refrigerants;
refrigeration; evaporators; entropy
This paper presents entropy generation analyses for the
evaporator, compressor, gas cooler, expansion device and
liquid-line suction-line heat exchanger for a
transcritical carbon dioxide cycle for automotive and
residential air-conditioning systems, and presents
entropy generation analyses for the evaporator,
compressor, condenser, and expansion device for a
subcritical R134a automotive air-conditioning system and
a subcritical R22 residential air-conditioning system.
The analyses show that the CO2 automotive
air-conditioning system generates 36% more entropy than
the R134a automotive air-conditioning system, and that
the CO2 residential air-conditioning system generates
63% more entropy than the R22 residential
air-conditioning system. The biggest contributors to the
lower CO2 performance are the heat rejection process and
the expansion related processes.