Centrifugal fan MoJet®

ventilationreversiblejet

One of the most common fans in Tunnel and Metro ventilation is the Jet Fan. Based on decades of experience and extensive R&D,TLT-Turbo has developed a new generation of standardized and modularized Jet Fan active parts to bring economic efficiency,quality and the highest degree of efficiency to the next level. The new MoJet® marks the next generation of Jet Fans for tunnel ventilation by further optimizing the aerodynamic inlet and outlet conditions. It was developed in a close cooperation with Mosen Ltd and renowned universities. By doing extensive research and testing at TLT-Turbo, we were able to develop this innovative product for tunnel ventilation together. Conventional Jet Fans are the standard means of providing longitudinal ventilation in tunnels. However, they suffer from the following significant disadvantage compared to the MoJet® . Thrust is lost due to friction between the jet and the tunnel surfaces. The discharged jet tends to stick to tunnel soffit and walls, due to the Coanda effect and swirl. Typically 30% to 50% of thrust is thereby lost. The reversible MoJet® tunnel ventilation system can increase the in-tunnel aerodynamic thrust by up to 50%, with reduced power consumption. To achieve such a significant improvement in performance, the MoJet® uses shaped nozzles which turn the jet flow away from the tunnel soffit and walls. This reduces surface friction, minimizing the Coanda Effect, where a reduction in static pressure due to the high jet velocity tends to deflect the jet towards any solid surface. The MoJet® represents a significant improvement over older technologies to reduce the Coanda effect, such as slanted silencers and jet flow deflectors.