Development of a new correlation for pre-dry out evaporative heat transfer coefficient of R290 in a microchannel

Abstract Although many correlations have and are being developed for two-phase heat transfer coefficient correlation in microchannels, none has the desired accuracy yet. This paper presents prospective improvements convective dry-out conditions; when drops at a certain vapor quality. An accurate forecast is needed to minimize over or under design, conserve energy material, maximize performance. R290 been reported be more efficient than R22. A new relevant across 831 sets of experimental data points microchannel was generated by optimizing six variables nucleate boiling suppression factor, S, force F, selected superposition type correlation. The optimized saturation temperature ranging between 5 25 °C, diameter 1.0 6.0 mm, flux 2.5 60 kW/m 2 , mass 50 500 kg/m s. MAE reduced from 21.84 17.02% pre-dry out data. may utilized estimate analysis investigated operating conditions. optimization approach here potential continuously improving any refrigerants considered.