Fundamental Aspects of the Application of Carbon Dioxide in Comfort Cooling.
Fundamental Aspects of the Application of Carbon Dioxide
in Comfort Cooling.
(187 K)
Brown, J. S.; Domanski, P. A.
ICR0100;
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.
Keywords:
carbon dioxide; comfort; cooling; refrigerants;
refrigeration; evaporators; entropy
Abstract:
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.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899