Conference Year



Refrigerants, HFC, HFO


Responses to an international flamework on climate change, such as the Kigali Agreement in 2016, have been discussed in an industrial field. The phase down regulation of CFC and HCFC refrigerant has been discussed and performed under the Montreal Protocol for refrigerants from the viewpoint of ozone layer protection. From the viewpoint of preventing global warming, HFC reduction plans are currently being proposed by North America, Europe, India, etc. within the framework of the Protocol. A developing country where the phase-out of CFCs and HCFCs began in 2013, are growing trend to switch to HFC or HFO mixed refrigerants with lower GWP than R410A. A revision of the regulations related to HFC are also being promoted in each region. The GWP upper limit for each equipment application was set together with the HFC phase down in Europe which due to the F-gas regulations. R32, HFO refrigerants such as R1234yf and R1234ze, or a mixed refrigerant of HFC and HFO are proposed as candidates for low GWP refrigerants. The problem of R32 was the higher discharge gas temperature than R410A, but the problem could be solved by temperature control and suitable refrigeration oil. On the other hand, the problem of refrigerants HFO and mixed HFO is easy to decompose than HFC. When HFO is decompose, it is generated acid such as fluorinated acid and trifluoroacetic acid. These acids make which is reduced the compressor reliability. We selected of suitable refrigeration oil and materials for the HFO and confirmed the compressor reliability