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Rapport 2414173 - October 2007 __________________________________________________________________ With very high concentration of water in R744 systems, the R744 gas hydrate can be formed. The R744 gas hydrate (see Figure 47) looks like ice, but exists also at higher temperatures than 0°C. The CO2 gas hydrate can create problem, e.g. plugging filters and pipes. Figure 47 : R744 gas hydrates (www.danfoss.com) Water can also enter the system via the lubricant oil. With synthetic mineral oil such as Poly- Alpha-Olefin lubricant oil, oxygen (generated by corrosion for example) reacts and yields water and a strong organic acid. This acid in turn reacts on construction materials. Figure 48 : Effect of oxygen on mineral oil (www.danfoss.com) With ester oil, free water combines to form an alcohol and a relatively weak acid (see Figure 48). However, when these reaction products are carried around in the refrigeration system, high temperatures will be encountered, with an amplification of the acidic effects. Figure 49 : Effect of water on ester oil (www.danfoss.com) __________________________________________________________________________________________ SHERPHA PROJECT - Transcritical R744 Heat Pumps – Technician's Manual 42/63PDF Image | Transcritical R744 (CO2) Heat Pumps 2017
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