Abstract
In this study, the condensation characteristics of R1234ze(E) and R134a were investigated experimentally ina horizontal multi-port extruded tube. The test tube has 17 rectangular mini-channels of 0.85 mm in hydraulicdiameter. Experiments were carried out in the mass velocity range of 100 to 500 kg･m-2･s-1 at saturationtemperature of 40 and 60 oC. The pressure drops were measured between both ends of the test tube. The localheat transfer coefficients were also measured in eight subsections, each of which is 75 mm in effective heattransfer length. The measured pressure drop of R1234ze(E) is larger than that of R134a at the sameexperimental condition. The measured heat transfer coefficient of R1234ze(E) almost equals to that of R134a.
