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Horizontal flow boiling of R22, R134a and their mixtures with oil in smooth and enhanced tubes

Cieśliński J., Targański W.

Archives of Thermodynamics

2007

Vol. 28, no. 2

19-40

The experimental stand and procedure for flow boiling investigations are described. Experimental data for pure R 22, R134a and their mixtures with oil in two smooth tubes and two enhanced tubes are also presented. The performance benefits of the micro-fin tube and corrugated tube are quantified and discussed. During tests inlet vapour quality was set 0[plus-minus]0,05 and outlet quality 0,7[plus-mines]0,01. Mass flux density varied from about 250 to 500 kg/m[^2]s. The experiments have been conducted for average saturation temperature 0[degrees]C. The ability of selected models to predict the boiling heat transfer coefficient is evaluated by comparison with the experimental data obtained in smooth tubes for pure R 22 and R134a.