Ventilation in buildings

1. VENTILATION IN
BUILDINGS

2. Ventilation
Ventilation refers to the process of circulating air in a
specific area or space, usually to improve the quality of the
air or to remove unwanted substances from it.
ventilation systems can be natural or mechanical, and they
serve various purposes, such as providing fresh air,
removing odors, reducing humidity, and removing
pollutants.

3. TYPES OF VENTILATION SYSTEMS
Natural ventilation: This relies on natural airflow to circulate air in a
space, often through open windows or vents.
Mechanical ventilation: This uses fans or other mechanical devices to
circulate air in a space.
Hybrid ventilation: This combines natural and mechanical ventilation to
achieve optimal results.

4. WAYS BY WHICH BUILDINGS
ARE NATURALLY VENTILATED
Single Sided Ventilation
Cross Ventilation
Stack Effect
Reverse Stack Effect

6. SINGLE SIDED VENTILATION
Single sided ventilation is the use of openings on one side of a
building.
This is used to naturally ventilate the space of projects with limited
area.
Single sided ventilation systems are also used in projects where cross
ventilation cannot be provided, due to structural or environmental
constraints.
Keep in mind though that this type of ventilation generates the least
air circulation when it comes to natural ventilation systems.

8. CROSS VENTILATION
Cross ventilation in buildings is a natural ventilation strategy that uses
opposing openings, such as windows, doors, or vents, on opposite sides of a
building to allow fresh air to flow through.
This system works by using the natural pressure difference created by wind
blowing across the building to drive the airflow.
Advantages
Improved indoor air quality
Increased occupant comfort
Energy savings
Low maintenance
Cost-effective
Natural daylighting

10. Stack Effect
The stack effect is a natural ventilation phenomenon that
occurs in buildings due to differences in air density caused
by temperature differences.
Warm air rises and cool air sinks, and this movement creates
a pressure difference, which can drive the flow of air through
a building.
In a building with a vertical shaft, such as a chimney or
stairwell, the warm air can be exhausted at the top of the
shaft, creating a negative pressure that draws cool air into
the building at the bottom of the shaft.