Tunnel Axial Flow Fan

TUNNEL AXIAL FLOW FAN Tunnel fans are an axial flow fans and moves an airstream along the axis of the fan. The air is pressurized by the aerodynamic lift generated by the fan blades, made like a propeller or an airplane wing. These fans are used as the ventilation systems in a tunnel for the comfort an safety of the passengers. High Performance Low Sound Non Overloading Characteristics Suitable for High Pressure Range Aerofoil Blades with higher Lift Coeficient Performance flexibility with adjustable blades Certified for 250 C for two hours operation 100% X-Rayed impellers Dynamically balanced at grade of G2.5 Compatible with variable frequency drives Die Cast aluminium hub and blades Rugged Construction with spun flang Uni/Reversible Design Available Easy installation of impellers with taper lock bush inside the hub Stall Free Operation Corrosion Resistant Stable Operation High Blade Strength Road Tunnel Ventilation Metro Tunnel Ventilation Ventilation for Tunnel Under Constructions Construction/Utility sites

ACAP Series For tunnel ventilation 3000 4500 4

APPLICATIONS 1. Ventilation for Tunnels under Construction Tunnels under construction are usually at a risk of having atmospheric contaminants, fumes & other pollutants produced during the various activities in the tunnels, requires mechanical ventilation to ensure that sufficient oxygen is available for respiration and to dilute other atmospheric contaminants. Products offered by Humidin: Humidin manufactures heavy duty design of single/ multistage fans to attain high pressure and large air volumes. The impellers are adjustable for variable pitch for wide performance ranges. Features: Fan Range- 450-2000mm Air Volume Max 200,000CMH Pressure Ranges 4500Pa Impellers- Aerodynamically designed with guide vanes Compatible with VFD

APPLICATIONS 2. Ventilation for Metro and Road Tunnels Generally, three approaches have been used in the design of vehicular tunnel ventilation system, viz. longitudinal, semi transverse and full transverse ventilation system. 2.1 Longitudinal Ventilation System Longitudinal Ventilation can be achieved by using Jet Fans mounted at the tunnel ceiling. For Jet Fans systems, the fans deliver air flow at a very high velocity and can create a momentum that will entrain the surrounding air to move in a desired air flow direction. 2.2 Semi Transverse Ventilation System Semi Transverse Ventilation system either supplies outdoor air or extracts exhaust air uniformly over the full length of the tunnel. Therefore, it always requires a supply air duct or an exhaust air duct running along the tunnel. In a fire emergency situation, the semi transverse supply system will operate in a reverse mode. Smoke will be captured over the length of the tunnel, with outdoor air entering the tunnel through the portals or adjacent air intake shafts. The aim is to maintain a smoke clear layer for passenger/vehicle evacuation. 7

APPLICATIONS 2.3 Full Transverse Ventilation System Full Transverse Ventilation System supplies outdoor air and extracts exhaust air uniformly over the full length of a tunnel. Therefore, a supply air duct and an exhaust air duct running along the tunnel are always required. With the Full Transverse Ventilation System, the pollutant level as well as the air velocity in the tunnel are relatively uniform. The Full Transverse Ventilation System attempts to control smoke and hot gases by extracting the smoke through the exhaust openings along the ceiling. The design aims at maintaining a smoke free layer for passenger evacuation. CFD SIMULATION HUMIDIN offers advanced and cost effective solutions to design and verification of Tunnel Ventilation Systems using different tools like Subway Environmental Simulation (SES) program, Computational Fluid Dynamics (CFD) tools were used to analyze the local effects of the design. 8

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TUNNEL AXIAL FLOW FAN-Ver 1.0 APRIL 2015