UNIT 2:VENTILATION

occurs when the air in a space is changed with outdoor air without the use mechanical systems, such as a fan

• Natural Ventilation

• Mechanical Ventilation

• Stack effect ventilation

• Wind effect ventilation

using additional equipment to create air movement for an enclosed space

• Natural Ventilation

• Mechanical Ventilation

• Stack effect ventilation

• Wind effect ventilation

When air flow is due to wind, air enters through openings in the windward walls, and leaves through openings in the leeward walls

• Wind driven ventilation

• Stack effect or ventilation

• Combination of both wind and stack effects

• Natural ventilation

When air movement is due to temperature difference between the indoor and outdoor, the flow of air is in the vertical direction and is along the path of least resistance.

• Wind driven ventilation

• Stack effect or ventilation

• Combination of both wind and stack effects

• Natural ventilation

a combined force of wind and stack effects

• Wind driven ventilation

• Stack effect or ventilation

• Combination of both wind and stack effects

• Natural ventilation

system slightly pressurizes the house by drawing outdoor air into the house

• Exhaust System

• Supply System

• Balanced System

• mechanical ventilation systems

may consist of a single fan that is centrally located in a hallway or at the top of the stairs, or it can be an upgraded bathroom fan that has a motor built to run for longer periods of time and is sized to ventilate the whole house

• Exhaust System

• Supply System

• Balanced System

• mechanical ventilation systems

uses two fans and creates a neutral, or balanced pressure.

• Exhaust System

• Supply System

• Balanced System

• mechanical ventilation systems

The importance of mechanical ventilation except:

• To remove heat and dirty air

• To control ventilation systems

• To get enough air – quality and quantity

• To give hot air into building

Trees can also be planted to either create windbreaks or to channel the wind into a building

• External Element

• Building Orientation

• Cross Ventilation

• Opening Size