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Evaporation and condensation of R134a inside a microfin tube


Autore: L.P.M. Colombo, A. Muzzio, A. Niro

Collana: BT - 34 - Mag 06 - Energy: production, distribution and conservation

This paper reports on average heat transfer coefficients and pressure drops of oil-free R134a in flow-boiling and convective-condensation inside a microfin tube with a new cross-section profile. Data obtained for a smooth tube are also reported for comparison. Both tubes have the same outside diameter of 9.52 mm; they are horizontally operated and are heated-cooled by a water stream. The microfin tube is characterized by 82 sharp fins alternating with two different heights. Evaporation tests are carried out at a nominal temperature of 5°C, for a mass velocity ranging from about 90 to 400 kg/(m2s), inlet quality between 0.1 and 0.6, and quality change varying from 0.1 to 0.5; wereasfor the condensation tests the nominal temperature is 35°C, the inlet quality ranges from 0.8 to 0.4 and the quality change from 0.2 to0.6.

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