CO2 condensation heat transfer coefficient and pressure drop in a mini-channel space condenser
[Display omitted] ► We investigated a space CO2 condenser’s heat transfer coefficient and pressure drop. ► A CO2 condenser with mini-channel of 0.9mm. ► HTCs agree with the prediction by Thome correlation within errors of ±30%. ► Flow pressure drops agree with the prediction by Friedel correlation w...
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Veröffentlicht in: | Experimental thermal and fluid science 2013-01, Vol.44, p.356-363 |
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Hauptverfasser: | , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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► We investigated a space CO2 condenser’s heat transfer coefficient and pressure drop. ► A CO2 condenser with mini-channel of 0.9mm. ► HTCs agree with the prediction by Thome correlation within errors of ±30%. ► Flow pressure drops agree with the prediction by Friedel correlation within errors of ±30%..
We present the flow condensation heat transfer characteristics of CO2 in a mini-channel condenser. The condenser consists of seven tubes in parallel, which are thermally connected to two aluminium base-plates by using thermal glue. At saturation temperatures ranging from −5°C to 15°C, with mass velocities of 180, 360 and 540kg/(m2s), respectively, and average vapour qualities from 0.2 to 0.8, we obtained the CO2 condensation heat transfer coefficients, ranging from 1700 to 4500W/(m2K). We compared the measured heat transfer coefficients with those predicted by the established correlations, and found that Thome’s was applicable to the condenser under investigation, with deviation less than 30%. We also discussed the measured pressure drop over the condenser, which increased with the mass velocity and the vapour quality, but decreased with the saturation temperature. |
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ISSN: | 0894-1777 1879-2286 |
DOI: | 10.1016/j.expthermflusci.2012.07.007 |