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Rapport 2414173 - October 2007 __________________________________________________________________ Before charging liquid R744 into the system on the high pressure side, it is therefore necessary to increase the system pressure to a level of about 6 bar using gaseous R744. Once this value is reached, recharging may proceed with liquid R744. The correct system charge must be known from the Service Manual. Do not attempt to charge an R744 system when the amount of refrigerant charge is unknown. This may lead to system overcharge and to high pressure increase. 6.1.3. R744 containers and recharge system Refrigerant R744 is available in pressurized cylinders with contents ranging from about 3 to 35 kg. R744 is produced by chemical companies such as Linde Gas, Air Liquide and Praxair. Cylinders are made of steel or aluminum, with a service pressure between 125 and 200 bars. Linde Gas available cylinders are listed in Table 6. The first column indicates the cylinder reference and the second column the R744 net content. The equivalent volume in gaseous form at 1 atm and ambient conditions is shown in the third column. Assuming a workshop with a width of 4 m, a length of 10 m and a height of 3 m, the last column shows the air R744 concentration in the air (in percent), should the entire cylinder spill into the room. Table 6 : Linde Gas R744 pressurized cylinders Cylinder R744 (kg) m3 @ 1 atm/20°C % in air in 120 m3 workshop Mini 3.7 1.88 1.6 B20 15 7.64 6.4 B30 22 11.20 9.3 B33 25 12.73 10.6 B40 30 15.27 12.7 B47 34.5 17.56 14.6 Table 6 shows that cylinder B30 reaches the lethal limit of 9%. However, the calculation shown in Table 6 assumes a uniform spread throughout the workshop. Since R744 is heavier than air (relative density of 1.52), it will stagnate in lower parts. Thus, even spills from cylinders B20 and B30 can be dangerous. Spills from the "mini" cylinder can cause health problems (see Table 4). It is therefore recommended to store R744 cylinders in ventilated areas. __________________________________________________________________________________________ SHERPHA PROJECT - Transcritical R744 Heat Pumps – Technician's Manual 46/63PDF Image | Transcritical R744 (CO2) Heat Pumps 2017
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