Improved Two-Phase Pressure Drop Correlation for 180DG Return Bends.
Improved Two-Phase Pressure Drop Correlation for 180DG
Domanski, P. A.; Hermes, C. J. L.
Asian Conference on Refrigeration and Air-Conditioning,
3rd. Proceedings. May 21-23, 2006, Gyeongju, Korea,
1-4 pp, 2006.
pressure drop; experiments; databases; correlation;
equations; return bends; air conditioning; refrigeration
A new correlation for two-phase pressure drop in 180DG
return bends is proposed based on a total of 241
experimental data points for R-22 and R-410A. The data
span smooth tubes with inner diameters (D) from 3.25 mm
to 11.63 mm, bend radii (R) from 6.35 mm to 37.25 mm,
and curvature ratios (2R/D) from 2.32 to 8.15. The
correlation predicts all data with a mean deviation of
15.7%, and 75% of the data fall within -25% error bands.