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REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 8 2.1 Transcritical operation Critical temperature A major difference with R744 compared to all other refrigerants is its operation above the critical temperature (31OC) in many systems. For an explanation of the critical point see the video shown in the link. Most R744 systems which reject their heat to ambient air operate above the critical point for some or all of the time. In these systems the condenser is referred to as a “gas cooler” because the refrigerant does not condense in this component when transcritical, the R744 turns to liquid only when the pressure is reduced: Danfoss video, CO2 phase change NaReCO2 manual Natural Refrigerant CO2 R744 systems are subcritical when the condensing temperature is below 31OC. R744 systems are transcritical when the “gas cooling temperature” is above 31OC. HFC, HC and R717 systems are always subcritical because the condensing temperature never exceeds the critical temperature (e.g. 101OC in the case of R134a). from www.danfoss.comPDF Image | Alternative Refrigerants
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