Table of Contents
What is the angle of cooling tower fan?
It was found that the cooling tower can operate in all approaches (5°C, 6°C, 7°C and 8°C), the cooling range of 5°C, wet bulb temperature of 26°C, and water flow rate of 3.9 m3/h by the adjustment of blade angle at 67°. Cooling Tower Institute. 1982.
How do you measure the blade angle of a cooling tower fan?
Position one blade so that it is in a horizontal position. Place protractor head across concave face of blade at tip and measure pitch angle from 90°. Position successive blades at this same spot and check each pitch angle. See figures on reverse side.
What is blade pitch angle?
Blade pitch, often shortened to pitch, refers to the angle between the propeller blade chord line and the plane of rotation of the propeller. Blade pitch is most often described in terms of units of distance that the propeller would move forward in one rotation assuming that there was no slippage.
Why are fan blades tilted?
Modern fan blades are pitched, or angled, to not only push air, but to create a downdraft so as to move air efficiently through the space. Fast fans increase airflow, but also require more energy to operate.
What type of angle is formed between the blades of a fan?
Blade pitch is the angle at which the blades are set relative to parallel to the ground. It is commonly stated that “the steeper the blade pitch, the more air a fan will move” or “a good fan will have a blade pitch of 14 degrees or more”.
How do you calculate air flow in a cooling tower?
The formula is total heat removed (11.2) times pounds per minute of air (6.95) times 60 minutes per hour. 11.2 X 6.95 X 60 = 4, 670.4 BTU/Hr. Therefore, a tower with a 100 CFM motor at these conditions would be removing 4,670.4 BTU/Hr.
How is blade angle measured?
Blade angle, usually measured in degrees, is the angle between the chord of the blade and the plane of rotation (Fig. 17-39) and is measured at a specific point along the length of the blade. The pitch in inches is the distance which the propeller would screw through the air in one revolution if there were no slippage.
Does blade pitch matter?
It is commonly stated that “the steeper the blade pitch, the more air a fan will move” or “a good fan will have a blade pitch of 14 degrees or more”. For example, ceiling fans with real palm leaf blades won’t move hardly any air no matter what angle the blades are set at.
What is the difference between pitch and blade angle?
Blade angle, usually measured in degrees, is the angle between the chord of the blade and the plane of rotation and is measured at a specific point along the length of the blade. The pitch is the distance in inches, which the propeller would screw through the air in one revolution if there were no slippage.
What is fan angle?
Fan Angle refers to the angular spread of a laser beam, and determines the size of a projection (such as a line or cross) at a particular distance. You should choose the smallest available fan angle that is still larger than this minimum value.
Which angle is 90 degree?
right angles
Angles that are 90 degrees (θ = 90°) are right angles. Angles that are 180 degrees (θ = 180°) are known as straight angles. Angles between 180 and 360 degrees (180°< θ < 360°) are called reflex angles.
What is the angle of a fan blade?
It’s the angle of the cooling tower fan blades relative to the shaft axis; cooling towers usually have propeller fans on the top to draw air through the tower. The “steeper” the angle the more aggressive the fan is, the more air it will move for a given rpm, and the more power it will draw.
What is the pitch angle of a cooling tower turbine blade?
First of all technically it is called the pitch angle of a turbine blade. Generally the pitch angle of a cooling tower turbine is very from 6 degree to 15 degree depending on the operational speed and discharge.
What are the components of a cooling tower?
The major cooling tower components include Cold Water Basin, Cooling Tower Structure, Fills, Drift eliminators, Cooling Tower Fans, Water Distribution Piping’s, Fan Deck & Fan cylinder, Cooling Tower Louvers, Gear box, Drive shafts & Mechanical Equipment Support, Valves, Nozzles and Electrical & Instrumentation systems. Let us see them in detail.
What is the bladeblade angle?
Blade angle is the angle of blade from the plain perpendicular to the drive shaft. Following are images from installation manual. Mostly every manufacturer specify the place where angle should be set.