Refrigerants and Working Fluids of the Next Generation

CFCs regulation has been accelerated in association with recent findings of ozone depletion. HCFCs, which are being investigated as alternatives to CFCs, will also be eventually regulated althoghu it will be difficult to identify satisfactory environmentally acceptable alternatives. Research and development on alternatives of zero ODP should be undertaken now. HFCs are considered as one of the next generation alternatives. This paper will present properties on HFCs and their mixtures such as general properties, flammability, solubility, stability, material compatibility, and cycle performance, including informations on CFCs and HCFCs regulations and up - dated results on AFEAS and PAFT.