The Next Generation of Jet Fans for Tunnel Ventilation.

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.

Benefits of the MoJet® Fan to Your Operation

Reduced number of Jet Fans

Reduction of up to 50% in power consumption

Changed fan diameter

Reduced cabling costs

Shorter longitudinal distances between fans

What Makes the MoJet® Fan Different

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.

Comparison of the jet and jet diffusion of Jet Fans with standard silencers (red) and MoJet® –silencers (blue) in a tunnel.
Direct comparison of the two velocity profiles for the measurement with standard silencer (red) and with MoJet® – silencer (blue)

Client Support Services

We provide support at every point of your ventilation system lifecycle. We offer planning and design support at the start of your project to ensure that the final system meets your precise requirements and meets every safety standard. This is followed by manufacturing, transport, assembly supervision and commissioning services. We take aerodynamic acceptance measures to ensure that the system is functioning optimally. TLT-Turbo also offers reconstruction and optimization of existing systems.

Contact your nearest TLT-Turbo office to consult on the tunnel fan that fits your specific requirements.

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