- Author
- Domanski, P. A. | Hermes, C. J. L.
- Title
- Improved Two-Phase Pressure Drop Correlation for 180° Return Bends.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD Federal University of Santa Catarina, SC, Brazil
- Book or Conf
- Asian Conference on Refrigeration and Air-Conditioning, 3rd. Proceedings. May 21-23, 2006, Gyeongju, Korea, 1-4 p., 2006
- Keywords
- pressure drop | experiments | databases | correlation | equations | return bends | air conditioning | refrigeration
- Identifiers
- refrigerant property calculations were based on REFPROP; NIST Reference fluids thermodynamic and transport properties ? REFPROP 7.0, Standard Reference Database 23; Geary's database and correlation; bend geometries tested by Chen et al.; fitted coefficients for Equation 7
- Abstract
- A new correlation for two-phase pressure drop in 180° 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.