Heat transfer of single phase flow with natural refrigerant (R-290) in microchannel

Environmental damage is becoming an important issue in climate change discussion in the world. The use of natural refrigerant at this time be an alternative choice as a substitute for refrigerant that damage the environment, both the impact of global warming potential and ozone depletion potential. The aim of this research is to develop the correlation of single phase heat transfer as part of contribution of the two-phase heat transfer. The research method used evaporation process in pipe 0.5 mm diameter and length of 0.5 meter. From a single phase heat transfer research data was developed a new correlation for single phase heat transfer on a microchannel based on heat transfer from Dittus-Boelter [1]. The new correlation of single phase heat transfer is 7.608 × 10⁻⁷ Re^1.913 Pr^0.4. Comparison of single phase heat transfer research data with new single phase heat transfer has MRD minus 2.87% and MAD = 30%. The comparison of single phase heat transfer of the research with existing correlation was obtained by the lowest MRD of Wang & Peng [2] with minus 7% and the highest MRD from Dittus-Boelther [1] with minus 70%.