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REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 24 6. R290 and R1270 (Propane and Propene) R290 and R1270 have a similar pressure temperature relationship and cooling capacity to R404A. The main design difference is due to the high flammability of these two refrigerants: Charge size is limited, see tables 5 and 6 of Guide 1 for more See REAL Alternatives information (R290 and R1270 are classified as group A3 Guide 1, tables 5 and 6 refrigerants); Some electrical components are designed for use in a flammable atmosphere. Appendix 1 provides more detail about the design process for systems which use a flammable refrigerant. This applies to flammable refrigerants such as R290 and R1270. Typical maximum system pressures (PS) are as follows: For the high side, 18.1 bar g for R290 and 21.8 for R1270 For the low side, 10.4 bar g for R290 and 12.7 bar g for R1270 Typically R404A components are used for systems running with R290 and R1270, apart from electrical devices – see next section. See REAL Alternatives Guide 1, figure 1 Danfoss Refrigerant Slider App Bitzer PT App Type Key facts GWP12 Sat temp13 Typical applications R290 Propane, C3H8, hydrocarbon (HC) Flammable 3 ‐42OC Chillers, integrals R1270 Propene (propylene), C3H6, hydrocarbon (HC) Flammable 3 ‐48OC Chillers, integrals examples of supermarket installations using hydrocarbon based systems in the UK 12 GWP is from F Gas Regulation EU 517:2014 13 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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