Critical Pressure: 7.377 MPa, Critical Temperature
30.978°C
Ideal Gas Constant of Carbon Dioxide: R = 0.1889 kJ/kg.K
Source of data: NIST Chemistry WebBook - accessed March 2007
Note: The
current refrigerant R134a has a Global
Warming Potential (GWP) of 1300 with
respect to CO2. There is currently serious
consideration of replacing it with R744
(Carbon Dioxide) in refrigeration and
heat pump applications, as well as automotive air conditionong
systems..
A typical home heat pump system is shown below, followed by the P-h plot. Notice how the transcritical cycle conveniently allows hot water heating together with space heating and air conditioning.
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Engineering Thermodynamics by Israel
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