Review Article
Performance of Heat Pump Air Conditioning with R1234ze (HFO) as a Refrigerant
Table 2
Different types of refrigerants and their characteristics [
7,
8,
37].
| | Operational fluids | Classification | Classification GWP | ASHRAE group | Cost ($/kg) | Restrictions |
| | R1234ze | HFO | <0.9 | A2L | 89 | Little flammability, stability issues | | R32 | HFC | 687 | A2L | 3.1 | Small flammability, medium GWP | | R134a | HFC | 1121 | A1 | 4.9 | Extraordinary GWP | | R744 (CO2) | Natural refrigerant | 1 | A1 | 0.8 | Short COP | | R290 (propane) | HC (natural refrigerant) | 3 | A3 | 1.4 | Extraordinary flammability | | R717 (NH3) | Natural refrigerant | <1 | B1 | 1.6 | Poisonousness | | R1234yf | HFO | <0.9 | A2L | 90 | Small flammability, stability issues | | R600a (Iso- butane) | HC (natural refrigerant) | 4 | A3 | 2.1 | Extraordinary flammability | | R152a | HFC | 140 | A2 | 1.4 | Medium flammability, low GWP | | R717 (NH3) | Natural refrigerant | <1 | B1 | 1.6 | Poisonousness | | R404a | HFC | 3920 | A1 | 3.6 | Extraordinary GWP |
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