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Rapport 2414173 - October 2007 __________________________________________________________________ B A C Figure 50 : R744 expansion processes As a rule of thumb, the expansion of liquid R744 from any pressure level, and the expansion of gaseous R744 from a pressure higher than 35 bars will lead to the formation of dry ice if the final pressure is lower than about 5.2 bars. This specific behavior should be borne in mind, for example when discharging R744 from systems. As of year 2007, there is no obligation to recover R744 from refrigeration/heat pump systems. Hence, R744 can be discharged to the atmosphere. In the event of a R744 release from the heat pump via a safety valve or when discharging R744 from a system, care must be taken not to deteriorate equipment by dry ice. In particular, when evacuating R744, avoid pipe lengths that could be plugged by dry ice formation due to pressure expansion. 6.1.2. Recharging R744 heat pumps When servicing heat pumps, refrigerant recharging for conventional refrigerants (HFCs and HCFCs) is carried out using the value of nominal charge and the following information: • the values of high pressure and subcooling after the condenser and/or superheat at compressor suction; • the refrigerant state before expansion (view through a liquid line sight glass, when available). __________________________________________________________________________________________ SHERPHA PROJECT - Transcritical R744 Heat Pumps – Technician's Manual 44/63PDF Image | Transcritical R744 (CO2) Heat Pumps 2017
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