New Developments in Refrigerant Design 1234yf

In addition, HFO-1234yf is slightly flammable, but can potentially be used without a secondary loop. This would be an advantage over a C02 system, which would most likely require a secondary loop. HFO-1234yf is flammable in concentrations 

FIGURE 9.8 Pressure-temperature curve of 134a versus HFO-1234yf. 

If we look at a properties chart (Table 9.10), we can see that critical performance characteristics such as boiling point, critical point, and vaporization pressures are nearly the same. The major difference is the GWP of 4 as compared to the value of 1,300 for 134a. 

Polypropylene (G/F)/nylon 6,6 Polyurethane open/closed cell foam Polypropylene (mica filled/glass filled/mineral filled) Aluminum tube AA4343/AA3003 base Aluminum tube AA4343/AA3003 base Nylon 6,6/nylon 6/polypropylene Nylon 6,6/nylon 6 Polypropylene (GF) 

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