CAR PARKING VENTILATION SYSTEM

What is Car Parking Ventilation System?

Conventional ventilation is used in closed car parks. It consists of both fresh-air fans and exhaust fans in combination with ducts for transporting air. In practice, there are several problems with conventional ventilation systems. For example: There is no or insufficient room for inlet and/or exhaust ducts.

There are 2 types of Car Parking Ventilation System.

1. Jet Fan Ventilation

2. Ducted Ventilation

Jet Fan Ventilation System

Jet Fans are a pollution control solution that help induce air to a common exhaust point through directed airflow.

There are 2 types of Jet Fan Ventilation System

1. Axial or Impulse Fan Ventilation System

2. Centrifugal or Induction Fan Ventilation System

Axial or Impulse Fan Ventilation System

An axial fan is a type of fan that causes gas to flow through it in an axial direction, parallel to the shaft about which the blades rotate. The flow is axial at entry and exit. The fan is designed to produce a pressure difference, and hence force, to cause a flow through the fan.

Centrifugal or Induction Fan Ventilation System

A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower, blower fan, or squirrel-cage fan.

Jet Fan Selection

Selection of Jet Fan is done based on its coverage area and CFD Analysis (Computational Fluid Dynamics - CFD)

For CFD analysis testing SMOKE should be exhausted within 16 Minutes of duration.

Ducted Ventilation System

It consists of air moving devices such as fans and blowers and a network of ducts to exhaust the smoke generated by vehicles or by any fire incident. Ducts are channels, tubes, or pipes that carry moving air in a particular direction.

Formula for Calculating Exhaust CFM

Exhaust CFM = (M3 x ACH) / 1.7 or (FT3 x ACH) / 60

Note:

M3 = Meter Cube = Length x Width x Height

FT3 = Feet Cube = Length x Width x Height

ACH = Air Changes Per Hour = 6 to 10

Fresh Air = 80% of Exhaust Air

Note: To maintain Negative Pressure