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REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 18 2. R717 (Ammonia) R717 design differences are mainly due to its toxicity, mild flammability, high discharge temperature, materials incompatibility and immiscibility with oil: Type Key facts GWP4 Sat temp5 Typical applications R717 Ammonia, NH3 Toxic and mildly flammable 0 ‐33OC Industrial Charge size is limited because of toxicity, see tables 5 and 6 of Guide 1 for more information (R717 is classified as a group B2 refrigerant); See REAL Alternatives Guide 1 “Introduction” Some electrical components are designed for use in an explosive atmosphere. Appendix 1 provides more detail about the design process for systems which use a flammable refrigerant. This applies to mildly flammable refrigerants such as R717; Typical maximum system pressure (PS) for the high side is 22 bar g, and typical PS for the low side is 11.4 bar g, so pressures are not excessively high; Danfoss Refrigerant Slider App Bitzer PT App Two stage compression is used for low temperature applications such as the processing and storage of frozen food to avoid excessive discharge temperatures; R717 corrodes copper, so pipe work and fittings are usually steel and open drive compressors specifically designed for use with R717 are used IoR Safety Code of Practice for Refrigerating Systems utilizing R717 R717 is total immiscible with compressor lubricant so lubricant which enters the low side of the refrigeration system stays there as a layer of oil below the R717. Lubricant recovery devices should be installed, preferably an integral oil recovery system that collects oil and returns it to the oil reservoir. 4 GWP is from F Gas Regulation EU 517:2014 5 Sat temp is the saturation temperature at atmospheric pressure (1 bar g), except for R744 where it is the surface temperature of solid R744 at atmospheric pressurePDF Image | Alternative Refrigerants
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