Heat transfer measurements for R254fa were conducted. The
heat transfer coefficient was determined for a smooth stainless
steel tube with an inner tube diameter of 3 mm. The experiments
were conducted for five mass fluxes (100, 300, 500, 700 and
1000 kg=(m2 s)), three heat fluxes (10, 30 and 50W=m2) and
at three saturation temperatures (40 C, 70 C and 125 C). The
experiments were used to determine the influence of the saturation
temperature, mass flux, heat flux and vapour quality on the
heat transfer coefficient.
At a low saturation temperature, the heat transfer coefficient
increases with an increasing mass flux. However, at a high saturation
temperature the heat transfer coefficient decreases with an
increasing mass flux. Furthermore, the heat transfer coefficient
increases with increasing vapour quality at a low saturation temperature.
On the contrary, the heat transfer coefficient decreases
at higher saturation temperatures.
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.