Thermodynamic Properties And Performances In Refrigeration And Air-conditioning Cycles Of CF₃I

Owing to its zero ozone depleting potential (ODP), low global warming potential (GWP) and proper pressure levels, CF3I, the originally developed halon alternative, is expected to play a role in substituting CFC and HCFC working fluids for refrigeration and air-conditioning applications.In this paper, the thermodynamic properties of CF3I and cycle performances in refrigeration and air-conditioning conditions of CF3I and mixtures of CF3I were theoretically investigated. It was shown that HC290/CF3I(35/65mol%) and HC290/CF3I/CO2(75/15/10mol%) were potential drop-in substitutes for CFC12 in refrigerators and HCFC22 in conditioners respectively.The unfairness existed in the current approaches experimentally assessing the cycle performances of various working fluids with an apparatus of a constant-speed compressor and area-fixed heat exchangers were identified. The concept and the formula of the additional temperature difference were presented and then incorporated into the two modified versions of experimental assessing approaches. With the modified approaches, the performances and the thermodynamic perfections of the cycles of various working fluids could be assessed under the same heat load to corrected area ratios. The validity and the much improved fairness of the modified approaches were proved by the comparatively experimental assessment on the air-conditioning cycle performances of HCFC22 and HCFC22/HC290.