Measurement of Air-Velocity Profiles for Finned-Tube Heat Exchangers Using Particle Image Velocimetry.
Measurement of Air-Velocity Profiles for Finned-Tube
Heat Exchangers Using Particle Image Velocimetry.
Yashar, D. A.; Domanski, P. A.; Cho, H. H.
International Refrigeration and Air-Conditioning
Conference. Proceedings. July 14-17, 2008, West
Lafayette, IN, 1-8 pp, 2008.
heat exchangers; air velocity; tubes; velocity
distribution; ducts; air flow; velocity profiles;
installing; air conditioning
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