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- W2473219984 abstract "Saturated flow boiling and convective condensation experiments for oil-free refrigerant R22 have been carried out with two microfin tubes of new design, that mainly differ in the number of fins, and with a smooth tube. All the tubes have the same outer diameter of 9.52 mm and are horizontally operated. Data are for mass fluxes ranging from about 90 to 440 kg/s m 2 . In boiling tests, the nominal saturation temperature is 5 °C, with inlet quality varying from 0.2 to 0.6 and the quality change ranging from 0.1 to 0.5. In condensation, results are for saturation temperature equal to 35 °C, with inlet quality between 0.8 and 0.4, and quality change within 0.6 and 0.2. The effect of mass flux, heat flux and vapour quality on heat transfer coefficients and pressure drop are examined in the present investigation. The comparison shows a large heat transfer augmentation with a moderate increment of pressure drops, especially in evaporation. In fact, for the microfin tube with the lesser number of fins, the enhancement factor comes up to 4 while the penalty factor is about 1.4 at the most. The increase of the number of fins lowers the heat transfer performance both in evaporation and condensation." @default.
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- W2473219984 date "2000-01-01" @default.
- W2473219984 modified "2023-09-27" @default.
- W2473219984 title "Evaporation and condensation of R22 inside two microfin tubes of new design" @default.
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