Experimental investigation on up-flow boiling of R1234yf in aluminum multi-port extruded tubes

Conference Year

2016

Authors

Jiyang Li, Department of Human and Engineered Environmental Studies, The University of TokyoFollow
Chaobin Dang, Department of Human and Engineered Environmental Studies, The University of TokyoFollow
Eiji Hihara, Department of Human and Engineered Environmental Studies, The University of TokyoFollow

Keywords

Upflow boiling, Heat tranfer, Multi-port extruded tube, Rectangular minichannel

Abstract

The local characteristics of heat transfer and pressure drop were investigated experimentally for the vertical upflow boiling of low GWP refrigerant R1234yf in two types of aluminum multi-port extruded tubes having 16 channels with a cross section of 0.9×0.2 mm2 and 40 channels with a cross section of 0.3×0.2 mm2 respectively. At an evaporating temperature of 15 ℃, the local heat transfer coefficient and pressure drop at heat flux of 4-16 kW/m2 and mass flux of 60-240 kg/(m2s) were measured. Combined with previous results of multi-port extruded tubes having 16 channels with a cross section of 0.9×0.9 mm2, the effect of tube dimension on boiling heat transfer was reported. In addition, based on the heat transfer coefficient at various heat flux and mass flux, the boiling heat transfer mechanism was briefly analyzed.Â