R&D Magazine: Energy-Efficient Tunnel Ventilation

A leading ventilation company develops jet fans that are smaller and up to 30% more energy efficient.

Improving the efficiency of turbomachinery, including jet (turbine) fans used in tunnel ventilation systems, is essential in combating the volatile cost of fuel and reducing emissions of greenhouse gases. Energy-efficient equipment is also more attractive to worldwide transportation authorities.

Longitudinal tunnel ventilation systems provide airflow along the length of a tunnel; they are needed to satisfy air quality requirements or to control smoke movement in case of a fire. While there are many different types of ventilation systems available, the most widely used type employs jet fans. In addition to being energy efficient, jet fan ventilation systems should be compact so as not to protrude into traffic space. System designs must also allow for closely spaced fan installation, to reduce cabling costs, and quiet operation that conforms to guidelines.


The MoJet allows for reversible flow. Images: ANSYS


Designing the solution with ANSYS

Mosen Ltd., a firm of consulting engineers that develops energy-efficient tunnel ventilation systems, uses ANSYS software to optimize systems design and meet other requirements. One of the most important factors in improving efficiency of tunnel ventilation systems is minimizing the Coanda effect.

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