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.

TUNNEL AXIAL FLOW FAN

Stall Free Operation

Corrosion Resistant

Stable Operation

High Blade Strength

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

Road Tunnel Ventilation

Metro Tunnel Ventilation

Ventilation for Tunnel Under Constructions

Construction/Utility sites

ACAP Series

For tunnel ventilation

3000

4500

4

5

APPLICATIONS

Features:

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.

Fan Range- 450-2000mm

Air Volume – Max 200,000CMH

Pressure Ranges – 4500Pa

Impellers- Aerodynamically designed with guide vanes

Compatible with VFD

1.

APPLICATIONS

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.

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.

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.

2.

2.1

2.2

7

APPLICATIONS

CFD SIMULATION

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.

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.

2.3

8

9

Embedded steel sheet

10

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TUNNEL AXIAL FLOW FAN-Ver 1.0 APRIL 2015