The tunnel construction works are mainly carried out by drill and blast method, which have many safety and health issues due to the emission of dust and many poisonous gasses. Hence it is essential to provide external fresh air required to allow a safe environment for workers working inside the tunnel.
The need for tunnel ventilation is critical for the life and safety of any person utilizing the tunnels. Typically, the ventilation fans are used to dilute toxic and inflammable gases to a safe level; dust and smoke dispersed; excessive heat should be relieved; and escape routes must be kept clear from smoke.
There are three basic types of control that can be utilized: portal to portal, shaft to shaft, and portal to shaft. These are used independently or in conjunction with each other. Fans utilized are both axial, reversible and unidirectional.
FALVENT is a Saudi manufacture offers a complete solution to meet underground ventilation needs during construction and after operation to achieve the air quality and provide standard ventilation.
FALVENT work with a qualified consultants to delivery of projects on time, to an agreed cost and to the highest quality. In order to optimize our solutions, we also use advanced CFD analysis to get an effective performance.
FALVENT cooperates with the strategic cooperation with main advantage manufactories European and Chinese manufacturers specialized in tunnel ventilation to produce fans according to international manufacturing as well as in line with the Saudi market.
FALVENT starts working with its customers from the initial study of the tunnel, in order to provide an optimal solution for each project. Also, FALVENT has a technical assistance department with the following services:
The jet fans and large flow axial fans can be used to clear the atmosphere inside the tunnel and achieve the safe evacuation during the emergency case.
| Fan type | Thrust Motor | rating | Volume | flow Air speed Rotor | RPM | Sound power |
|---|---|---|---|---|---|---|
| [N] | [kW] | [m3/s] | [m/s] | [RPM] | [dB(A)] | |
| CFC 500 | 109 | 2.2 | 4.39 | 22.2 | 2900 | 87 |
| CFC 630 | 290 382 470 542 |
7.5 12 15 18.5 |
8.91 10.23 11.34 12.18 |
28.58 32.81 36.36 39.06 |
2900 2900 2940 2940 |
90 92 93 94 |
| CFC 710 | 388 492 573 663 |
12 15 18.5 26 |
11.59 13.06 14.09 15.15 |
29.28 32.98 35.59 38.28 |
2900 2940 2940 2940 |
99 101 102 105 |
| CFC 800 | 625 740 |
18.5 26 |
16.58 18.04 |
32.98 35.89 |
2940 | 105 107 |
| CFC 900 | 343 417 525 |
7.5 10 15 |
14.14 15.59 17.49 |
22.23 24.5 27.5 |
1450 1470 1470 |
92 93 95 |
| CFC 1000 | 507 615 695 749 |
11 15 18.5 22 |
19.1 21.04 22.36 23.22 |
24.33 26.79 28.48 29.57 |
1470 1470 1470 1470 |
95 96 97 98 |
| CFC 1120 | 713 805 869 1004 |
15 18.5 22 30 |
25.38 26.98 28.01 30.11 |
25.76 27.37 28.43 30.56 |
1470 1470 1470 1470 |
97 97 98 100 |
| CFC 1250 | 1030 1198 1731 |
22 30 75 |
34.04 36.71 44.13 |
27.74 29.91 35.96 |
1470 1470 1470 |
100 101 103 |
| CFC 1600 | 1105 1381 1543 2236 2438 |
22 30 37 75 90 |
39.68 44.37 46.9 56.45 58.94 |
25.78 28.82 30.47 36.67 38.29 |
1470 1470 1470 1470 1470 |
99 101 101 04 105 |
| CFC 1400 | 2052 2653 2870 |
55 75 90 |
61.81 70.28 73.1 |
30.74 34.95 36.36 |
1470 1470 1470 |
105 106 106 |
Systems using Novenco tunnel fans employ the jet prin- ciple to push air through the tunnel from intake to ex- haust. The air is moved by impulses injected by a suf- ficient number of tunnel fans mounted in the ceiling.
Tunnel fans function by sucking a small part of air in and expelling it with high speed. The ambient air is thereby set in motion.
| Model | Diameter | Max Air Flow | Max Pressure | Motor Speed | Voltage/Frequency | Power | Article Number |
|---|---|---|---|---|---|---|---|
| mm | m3/hr | Pa | rpm | V/Hz | KW | ||
| AXF 800 D4 T01 | 800 | 710 | 1600 | 1480 | 380 V|60 HZ | 2X7.5 | 2234401 |
| AXF 800 D4 T02 | 800 | 820 | 2240 | 1480 | 380 V|60 HZ | 2X11 | 2234402 |
| AXF 900 D4 T01 | 900 | 927 | 1834 | 1480 | 380 V|60 HZ | 2X15 | 2234403 |
| AXF 900 D4 T02l | 900 | 1090 | 2830 | 1480 | 380 V|60 HZ | 2X22 | 2234404 |
| AXF 900 D4 T03 | 900 | 1325 | 3200 | 1480 | 380 V|60 HZ | 2X30 | 2234405 |
| AXF 1000 D4 T01 | 1000 | 1500 | 3500 | 1480 | 380 V|60 HZ | 2X37 | 2234406 |
| AXF 1000 D4 T02 | 1000 | 1736 | 3859 | 1480 | 380 V|60 HZ | 2X45 | 2234407 |
| AXF 1120 D4 T01 | 1120 | 1985 | 4150 | 1480 | 380 V|60 HZ | 2X55 | 2234408 |
| AXF 1120 D4 T02 | 1120 | 2281 | 4628 | 1480 | 380 V|60 HZ | 2X75 | 2234409 |
| AXF 1250 D4 T01 | 1250 | 2912 | 5355 | 1480 | 380 V|60 HZ | 2X110 | 2234410 |
| AXF 1250 D4 T02 | 1250 | 3300 | 5920 | 1480 | 380 V|60 HZ | 2X132 | 2234411 |
| AXF 1400 D4 T01 | 1400 | 4116 | 6860 | 1480 | 380 V|60 HZ | 2X160 | 2234412 |
| AXF 1400 D6 T01 | 1400 | 2725 | 3100 | 980 | 380 V|60 HZ | 2X75 | 2234413 |
| AXF 1500 D6 T01 | 1500 | 3352 | 3559 | 980 | 380 V|60 HZ | 2X90 | 2234414 |
| AXF 1600 D6 T01 | 1600 | 4068 | 4049 | 980 | 380 V|60 HZ | 2X110 | 2234415 |
| AXF 1700 D6 T01 | 1700 | 4879 | 4571 | 980 | 380 V|60 HZ | 2X160 | 2234416 |
| AXF 1800 D6 T01 | 1800 | 5792 | 5124 | 980 | 380 V|60 HZ | 2X200 | 2234417 |
| AXF 1900 D6 T01 | 1900 | 6175 | 5412 | 980 | 380 V|60 HZ | 2X220 | 2234418 |
| AXF 2000 D6 T01 | 2000 | 6684 | 5820 | 980 | 380 V|60 HZ | 2X250 | 2234419 |
| AXF 2200 D6 T01 | 2200 | 8020 | 6926 | 980 | 380 V|60 HZ | 2X315 | 2234420 |
| AXF 2400 D6 T01 | 2400 | 9550 | 8173 | 980 | 380 V|60 HZ | 2X355 | 2234421 |
The variable frequency drive (VFD) controls the fan motor running achieve the effective control of the tunnel ventilation fans as follows:
Ventilation systems may be configured based on different key elements such as the type of tunnel, length, slope or traffic volume:
Falvent use the CFD simulations for predicting ventilation effectiveness inside underground tunnels. CFD analysis can help to simulate various design configurations and situations thereby verifying the performance of the installed systems virtually and the using CFD modelling to rapidly provide with accurate simulation results for various design scenarios as well as CFD allows to cut significant costs on testing and faster project delivery.
