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Rapport 2414173 - October 2007 __________________________________________________________________ Figure 3 : Comparison of evaporating pressures Note that below a pressure of 5.2 bar, solid and gaseous R744 phases may co-exist at low temperature. This behavior is totally different from that observed with traditional refrigerants, and will have important consequences on the operation, servicing and maintenance of a system working with R744. Figure 3 compares the evaporating operating pressures of R744 to those encountered with R410A and R404A. It can be observed that R744 systems will require to operate a much higher pressures than conventional systems. __________________________________________________________________________________________ SHERPHA PROJECT - Transcritical R744 Heat Pumps – Technician's Manual 11/63PDF Image | Transcritical R744 (CO2) Heat Pumps 2017
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