The Latest Review of Low GWP (<100) HFO Refrigerants and Studies on the Pool Boiling Heat Transfer

The low GWP refrigerants attract a great attention due to various regulations such as Montreal protocol amendment and F-gas regulation. The amendment of Montreal protocol proposes to reduce the HFCs consumption by 85% until 2035 and F-gas legislation will reduce the HFCs consumption by 79% until 2030. In 2010, US DOE launched the low GWP refrigerant project which covers the lifecycle climate performance modeling, experimental evaluation and field testing. In 2015, Korea launched the project to develop the core technology of refrigeration system for low GWP (<100) refrigerants application. Since the project limited the GWP value less than 100, the applicable candidates (except for natural working fluids) are restricted about five refrigerants including R-1234yf, R-1234ze-(E), R444A, R-1233zd(E) and R-1336mzz. In the literature, to the best of the author’s knowledge, there is very limited information for pool boiling studies except R-1234yf. In present work, the cycle simulation and the prediction of pool boiling heat transfer coefficient for each refrigerant has been conducted. And the literature review of pool boiling for the refrigerants has been performed.