NATURAL VENTILATION AND AIR MOVEMENT CONCEPT

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1) Natural Ventilation and Air Movement concept

Natural Ventilation is caused by naturally produced pressure difference due to wind outside the building.

NATURAL VENTILATION AND AIR MOVEMENT CONCEPT

It ( Driving force ) drives the ventilation. The driving force can be wind.
Example:-   Stack ventilation.

It ( Ventilation principle ) is used to exploit the natural driving forces to ventilate space.
Example:-  Cross ventilation.

It ( Characteristic element ) is used to realize the natural ventilation.
Example:-  Wind Tower, Wind Scoops.

2) Why we need Ventilation?

  • To provide an acceptable indoor air Quality, which essentially is based on the supply of fresh air and the removal or dilution of indoor pollution concentration.
  • To provide Thermal Comfort
WHY WE NEED VENTILATION

3) Types of Natural Ventilation – i

TYPES OF NATURAL VENTILATION

i) Wind driven Ventilation

ii) Stack Ventilation

i) Wind driven Ventilation

Windward: The side of an object facing the wind.
Leeward: The side of an sheltered from the wind.

WIND DRIVEN VENTILATION
  • Wind hits the Windward wall causing a direct +ve pressure.
  • Wind moves around the building leaves the Leeward wall with a -ve pressure.
WIND DRIVEN VENTILATION ONE

ii) Stack Ventilation

STACK VENTILATION
  • It is a kind of Passive ventilation that use air pressure differences due to height to pull air through the building.
  • Stack ventilation uses temperature differences to move air. Hot air rises because it is lower pressure.

Warm air which is less dense in the building rises, the cooler air is sucked from the openings below.

  • Inlets which supply air should low in the room.
  • Outlets should be located across the room and at high level.
STACK VENTILATION ONE

Air supply through louvers and extracted through chimneys .
Wind not needed.

4) Types of Natural Ventilation – ii

TYPES OF NATURAL VENTILATION ONE

i) Cross Ventilation

ii) Position of openings

iii) Size of openings

i) Cross Ventilation

When placing ventilation openings, inlets and outlets to optimize the path air follows through the building. Windows or vents on opposite sides of the building give natural breezes a pathway through the structure. This is called cross-ventilation.

CROSS VENTILATION

ii) Position of openings

POSITION OF OPENINGS

Windows should be staggered rather than aligned

POSITION OF OPENINGS ONE

Partitions should not be placed near windows causing an abrupt change of wind direction.

POSITION OF OPENINGS TWO

Windows on adjacent walls should preferably not be so placed as to cause an abrupt change of wind direction.

iii) Size of openings

SIZE OF OPENINGS

Outlet should be preferably larger than inlet.

SIZE OF OPENINGS ONE

Openings should be placed on two external walls with the door on one internal wall.

20) Types of Natural Ventilation – iii

TYPES OF NATURAL VENTILATION TWO

i) Wind Scoop

ii) Wind Tower

iii) Earth air tunnel


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