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Measurement of Air-Velocity Profiles for Finned-Tube Heat Exchangers Using Particle Image Velocimetry.


pdf icon Measurement of Air-Velocity Profiles for Finned-Tube Heat Exchangers Using Particle Image Velocimetry. (219 K)
Yashar, D. A.; Domanski, P. A.; Cho, H. H.

2195;

International Refrigeration and Air-Conditioning Conference. Proceedings. July 14-17, 2008, West Lafayette, IN, 1-8 pp, 2008.

Keywords:

heat exchangers; air velocity; tubes; velocity distribution; ducts; air flow; velocity profiles; installing; air conditioning

Abstract:

The performance of a finned tube heat exchanger is strongly affected by the velocity distribution of the air that passes through it. The air velocity distribution for finned-tube heat exchangers has gone largely undocumented because it is difficult to measure accurately. In this study, the air velocity distribution upstream of three heat exchangers installed in a horizontal duct is examined; a vertically oriented single-slab coil, a single-slab coil placed at an angle of 65o to the duct wall, and a two-slab A-Shaped coil with a 34o apex angle. The data was taken using a non-intrusive, laser based technique called Particle Image Velocimetry (PIV). The measurement results show that the air inlet velocity profile is strongly influenced by the heat exchanger's design and application.