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Rapport 2414173 - October 2007 __________________________________________________________________ 5.2.2. Operating temperatures and pressures For ambient temperatures of about 7°C, typical pressures for air source heat pumps under operation are as follows : • Low pressure side : pressures between 25 and 50 bars and evaporating temperature between –12°C and 20°C. Under lower ambient temperatures, these values may be lower. • High pressure side : pressures between 90 and 130 bars, temperatures between 90 and 130°C. Refrigerant piping on the high pressure side will be therefore very hot and will cause burning. Direct contact must be avoided when the unit is operating or has just been shut down. 5.2.3. Material compatibility The information contained in Table 5 has been compiled from Air Liquide (sources : International Standards: Compatibility of cylinder and valve materials with gas content; Part 1: ISO 11114-1 (Jul 1998), Part 2: ISO 11114-2 (Mar 2001)), and must be used with extreme caution. No raw data such as this can cover all conditions of concentration, temperature, humidity, impurities and aeration. It is therefore recommended that this table be used to choose possible materials and then more extensive investigation and testing is carried out under the specific conditions of use. The collected data mainly concern high pressure applications at ambient temperature and the safety aspect of material compatibility rather than the quality aspect. __________________________________________________________________________________________ SHERPHA PROJECT - Transcritical R744 Heat Pumps – Technician's Manual 39/63PDF Image | Transcritical R744 (CO2) Heat Pumps 2017
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