Dunan patent fastening type plate and frame integrated air handling unit is a kind of new aluminum alloy frame
developed by our company. The unit is mainly consisted of filter, oval tube exchanger tube, fan, and motor, etc, meeting the requirements of various residual pressures, various cooling capacity, and various air outlet forms. Its housing is
directly assembled by side panels and the panel frame adopt patent aluminum alloy and insulation composite structure, so as to install the panel in place accurately, which guarantee the tightness of case and anti-cold bridge as well as the case strength. This series of unit operate stably, with low noise and excellent overall performance. It can be widely used in hotels,
shopping malls, office buildings, stadiums, subways and other occasions requiring air handling.
Key Technology- Oval Tube Heat Exchanger
1. Reduce the wind resistance by 50%, with low fan energy consumption. 2. Increase the heat transfer efficiency by 10%-15%, guaranteeing excellent unit performance. 3. Anti-corrosive hydrophilic aluminum fin, ensures longer service life.
Lower Wind Resistance
Under same tube spacing, increasing the net flow area between tubes can decrease the net face velocity and reduce the turbulence on the leeward side of oval tube, so as to reduce the wind resistance. The following figures on the left are the comparison of wind-side resistance test results
between oval tube heat exchanger and circular tube heat
exchanger under different wind velocities. It can be seen
from the figure that the wind-side resistance of oval tube
heat exchanger is about 50% lower than that of circular
tube heat exchanger.
Higher Heat Transfer Coefficient
Oval tube avoids the escape of airflow in circular tube, increasing the effective contact surface area by 40%, so as to improve the efficiency of heat exchange. The
following figure onw ght is the comparison of heat
transfer coefficient test results between oval tube heat
exchanger and circular tube heat exchanger under
different wind velocities. It can be seen from the figure
that the heat transfer coefficient of oval tube heat
exchanger is about 10%-15%higher than that of circular
tube heat exchanger.
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