Industrial Ventilation

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Industrial Ventilation

• - A major control measure

Dr. AA, UTM
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Part 1 - Introduction
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What Is Industrial Ventilation?

• Environmental engineers view
• The design and application of equipment for
  providing the necessary conditions for
  maintaining the efficiency, health and safety of
  the workers
• Industrial hygienists view
• The control of emissions and the control of
  exposures
• Mechanical engineers view
• The control of the environment with air flow.
  This can be achieved by replacement of
  contaminated air with clean air

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Why Industrial Ventilation?

• To maintain an adequate oxygen supply in the work
  area.
• To control hazardous concentrations of toxic
  materials in the air.
• To remove any undesirable odors from a given
  area.
• To control temperature and humidity.
• To remove undesirable contaminants at their
  source before they enter the work place air.

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Types Of Industrial Ventilation Systems

• Supply systems
• To create a comfortable environment in the plant
  i.E. The HVAC system
• To replace air exhausted from the plant i.E. The
  replacement system
• Exhaust Systems
• An exhaust ventilation system removes the air and
  airborne contaminants from the work place air
• The exhaust system may exhaust the entire work
  area, or it may be placed at the source to remove
  the contaminant at its source itself

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Supply Systems

• Components
• Air inlet section
• Filters
• Heating and/or cooling equipment
• Fan
• Ducts
• Register/grills for distributing the air within
  the work space

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Exhaust Systems

• Types of exhaust systems
• General exhaust system
• Local exhaust system

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General Exhaust Systems

• Application
• Used for heat control in an area by introducing
  large quantities of air in the area. The air may
  be tempered and recycled.
• Used for removal of contaminants generated in an
  area by mixing enough outdoor air with the
  contaminant so that the average concentration is
  reduced to a safe level.
• Two Types
• Natural Ventilation uses wind or thermally
  induced convection to induce air flow.
• Mechanical Ventilation Uses fan (with or
  without duct)

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Local Exhaust Ventilation (LEV)

• The objective of a local exhaust system is to
  remove the contaminant as it is generated at the
  source itself.
• Advantages
• More effective as compared to a general exhaust
  system. Remove contaminant before it has a chance
  to spread.
• The smaller exhaust flow rate results in low
  heating costs compared to the high flow rate
  required for a general exhaust system.
• The smaller flow rates lead to lower costs for
  air cleaning
• Components
• Hood
• The duct system including the exhaust stack
  and/or recirculation duct
• Air cleaning device
• Fan, which serves as an air moving device

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Local Exhaust Ventilation
Exhaust outlet
Fan and motor
Ducting
Hood or exhaust inlet
Filter or purifying system
Ducting
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What is the difference between Exhaust and Supply
systems?
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End of Part 1