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REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 22 4. R1234ze R1234ze design differences are due to its mild flammability and its low pressure and capacity: Charge size is limited, see tables 5 and 6 of Module 1 for more information (R1234ze is currently classified as a group A2 refrigerant); See REAL Alternatives 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 mildly flammable refrigerants such as R1234ze; Typical maximum system pressure (PS) for the high side is 10.3 bar g, and typical PS for the low side is 5.1 bar g, so components and pipe work can be specified for a significantly lower pressure than for other HFCs; The cooling capacity is approximately 75% that of R134a and the COP is very similar. So the compressor would have a similar sized motor, but a displacement 30% greater than for R134a to provide the same capacity. Currently very few compressors are available for use on R1234ze. examples of equipment designed to use R1234ze See REAL Alternatives Guide 1, figure 1 Danfoss Refrigerant Slider App Bitzer PT App UNEP Case Study including Waitrose trial Type Key facts GWP8 Sat temp9 Typical applications R1234ze Unsaturated HFC (aka hydro fluoro olefin, HFO) Mildly flammable 7 ‐19OC Chillers, split air conditioning, integrals 8 GWP is from F Gas Regulation EU 517:2014 9 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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