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REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 23 5. R600a (Iso butane) The design differences associated with R600a are due to its high flammability and its very low pressure and capacity: Charge size is limited, see tables 5 and 6 of Guide 1 for more See REAL Alternatives information (R600a is classified as a group A3 refrigerant); Guide 1, tables 5 and 6 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 600a; Typical maximum system pressure (PS) for the high side is 6.8 bar g, and typical PS for the low side is 3.3 bar g, so components and pipe work can be specified for a significantly lower pressure than for other HFCs; See REAL Alternatives Guide 1, figure 1 Danfoss Refrigerant Slider App Bitzer PT App The cooling capacity is approximately 50% that of R134a and the COP is very similar. So the compressor has greater displacement to provide the same cooling capacity, but a similar sized motor. Compressors for R600a are widely available for domestic and small commercial sized systems, but not for larger systems. Type Key facts GWP10 Sat temp11 Typical applications R600a Isobutane, C4H10, hydrocarbon (HC) Flammable 3 ‐12OC Domestic and small commercial systems 10 GWP is from F Gas Regulation EU 517:2014 11 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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