5.6 Direction of Transportation
187
Scheme (a): Central ventilation. 1: 0, 2: −720, 3: −1200, 4: −1500, 5: −2100,
6: −2400 (Pa)
Scheme (b): Diagonal ventilation. 1: 0, 2: −500, 3: −680, 4: +450, 5: 0 (Pa)
In order to locate the absolute pressures add 101,300 Pa to all the previous values.
5.7 Ventilation on Demand
Ventilation on Demand (VOD) is a system by which ventilation can exactly adapt to
real ventilation needs. This means (Dicks and Clausen 2017):
(a) Ventilating only the zones of the mine were ventilation is needed. This is
equivalent, in most cases, to the active zones of the mine.
(b) If ventilation in a mine zone is necessary airflow requirements may change over
time.
(c) Not all auxiliary systems are required simultaneously.
(d) Probably the original design criteria have been exceeded so changes are
necessary. This is the opposite of the “set and forget” policy.
(e) Non-active periods usually require less ventilation.
Ventilation on Demand can be carried out at 5 different levels (Tran-Valade and Allen
2013), namely:
1. User control: It is based on the manual control of fans and regulators to be adapted
to the ventilation requirements.
2. Time of day scheduling: Actions over fans and regulators are not carried out
manually but on a pre-set schedule.
3. Event-based: Changes in the ventilation system correspond with certain activities
and events, e.g. blastings or a mine fire.
4. Tagging: The airflow is distributed inside the mine depending on a tag and tracking
system which provides real-time location of the personnel and vehicles.
5. Environmental: Making use of modern-day computer software to continuously
monitor the concentration of gases (Atmospheric Monitoring System, AMS). For
this system to work, it is essential to have: (a) gas and flow sensors, (b) personnel
and machinery tracking devices indicating their location at any given time, (c)
fan control systems (motors with variable-frequency drive), and (d) qualified
personnel.
The airflow diminution consequence of VOD results in a significant energy consumption reduction (Jahir et al. n.d.). Some studies indicate that VOD can save up to 50%
on ventilation costs (Wallace et al. 2015).
187
Scheme (a): Central ventilation. 1: 0, 2: −720, 3: −1200, 4: −1500, 5: −2100,
6: −2400 (Pa)
Scheme (b): Diagonal ventilation. 1: 0, 2: −500, 3: −680, 4: +450, 5: 0 (Pa)
In order to locate the absolute pressures add 101,300 Pa to all the previous values.
5.7 Ventilation on Demand
Ventilation on Demand (VOD) is a system by which ventilation can exactly adapt to
real ventilation needs. This means (Dicks and Clausen 2017):
(a) Ventilating only the zones of the mine were ventilation is needed. This is
equivalent, in most cases, to the active zones of the mine.
(b) If ventilation in a mine zone is necessary airflow requirements may change over
time.
(c) Not all auxiliary systems are required simultaneously.
(d) Probably the original design criteria have been exceeded so changes are
necessary. This is the opposite of the “set and forget” policy.
(e) Non-active periods usually require less ventilation.
Ventilation on Demand can be carried out at 5 different levels (Tran-Valade and Allen
2013), namely:
1. User control: It is based on the manual control of fans and regulators to be adapted
to the ventilation requirements.
2. Time of day scheduling: Actions over fans and regulators are not carried out
manually but on a pre-set schedule.
3. Event-based: Changes in the ventilation system correspond with certain activities
and events, e.g. blastings or a mine fire.
4. Tagging: The airflow is distributed inside the mine depending on a tag and tracking
system which provides real-time location of the personnel and vehicles.
5. Environmental: Making use of modern-day computer software to continuously
monitor the concentration of gases (Atmospheric Monitoring System, AMS). For
this system to work, it is essential to have: (a) gas and flow sensors, (b) personnel
and machinery tracking devices indicating their location at any given time, (c)
fan control systems (motors with variable-frequency drive), and (d) qualified
personnel.
The airflow diminution consequence of VOD results in a significant energy consumption reduction (Jahir et al. n.d.). Some studies indicate that VOD can save up to 50%
on ventilation costs (Wallace et al. 2015).