GENERAL
Witt & Sohn AG has developed the patented Banana Jet®. Depending on the tunnel characteristics the Banana Jet® achieves 20-50% more effective thrust than a traditional jet fan of the same size. The Banana Jet® Fan can substantially reduce the costs for a new tunnel ventilation system. It is also possible to cost-effectively boost the performance of the existing tunnel ventilation system in case of increased traffic loads or higher fire safety requirements.
A significant part of the airflow of a standard Jet Fan sticks to the ceiling and so the transferred impulse is significantly reduced. To take this effect into account several tunnel installation loss factors (Kempf-Factor etc.) have to be applied.
The Banana Jet® directs the exhaust Jet slightly towards the centre of the tunnel, therefore frictional losses due to swirls at the ceiling are negligible. So with the Banana Jet® tunnel installation loss factors such as the Kempf-Factor can be ignored in most of the cases.
FANS AT A GLANCE
- Diameters from 400 to 1800 mm
- Wall thickness from 4 to 10 mm
- Volume flow rates up to 3,20,000 CMH
- Jet thrusts up to 5000 N
- Temperature resistance up to 700
- Diverse highly durable materials
BANANA JET ® BENEFITS
- Fewer jet fans, lower investment costs for fans
- Reduction of System losses by more than 25% according to ISO 13350.
- Lower power consumption, lower investment costs for the electrical system, especially cabling.
- If niches are required, then they can be smaller and shorter, lower civil construction costs.
- Lower operational cost because of reduced power consumption and fewer fans to be maintained
- Less turbulence of stratified smoke layer at the ceiling
A good idea needs good protection. For this reason the Banana Jet® principle has been patented!
More efficiency means more savings!
VELOCITY PROFILES
FAN SELECTION TABLES
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BANANA JET
ROAD TUNNEL BANANA JET
BANANA JET IN SUB WAY
