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Rapport 2414173 - October 2007 __________________________________________________________________ Gaseous R744 is 1.5 times heavier as air. Therefore, when released to the air it will concentrate at low elevations. R744 will form "dry ice" at -78.4oC. One kg of dry ice has the cooling capacity of 2 kg of ordinary ice. Gaseous or liquid carbon dioxide, stored under pressure, will form dry ice through an auto-refrigeration process if rapidly depressurized. Figures 2 and 3 show the thermodynamic properties of R744. Compared to other fluids traditionally used as refrigerants, its critical point at 31°C is very low and its critical pressure at about 74 bars is high. These differences have, as shall be discussed, important consequences on heat pumping cycles using R744. Figure 2 : Pressure-Temperature phase diagram of R744 (Danfoss) __________________________________________________________________________________________ SHERPHA PROJECT - Transcritical R744 Heat Pumps – Technician's Manual 10/63PDF Image | Transcritical R744 (CO2) Heat Pumps 2017
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