Cooling Tower Fan Cylinder, Deck, Pitch, Cube and Others

Take a look at some important cooling tower parts starting from F

• Fan Cylinder- It is cylindrical or venturi-shaped structure in which a propeller fan operates. It is also known as fan stack specially used on large-sized towers.
• Fan Deck- It is a surface enclosing the top structure of an induced draft cooling tower. It is exclusive of distribution basins on a crossflow tower.
• Fan Pitch- The angle which the blades of a propeller fan make with the plane of rotation, measured at a prescribed point on each blade.
• Fan Scroll- It is a convolute housing in which a centrifugal fan operates
• Fill Deck- It is one of a succession of horizontal layers of splash bars utilized in a splash-fill cooling tower.
• Fill Cube- It is the amount of fill required in a volume one bay long by one bay wide by an air travel high.
• Film Fill- It is a part of cooling tower in which film type fill is utilized for the primary heat transfer surface.

Advantages of Using Film Fill in Cooling Tower

Typical Comparisons Between Various Fill Media
	Splash Fill	Film Fill	Low Clog Film Fill
Possible L/G Ratio	1.1-1.5	1.5-2.0	1.4-1.8
Quality of Air Required	High	Much Low	Low
Effective Heat Exchange Area	30-45 m²/m³	150 m²/m³	85-100 m²/m³
Fill Height Requirement	5 -10 m	1.2 – 1.5 m	1.5-1.8 m
Pumping Heat Requirement	9-12 m	5-8 m	6-9 m

As discussed earlier, there are two types of fill media- Splash Film & Film Fill. A recent survey on HVAC industry confirmed that Film Fill is widely used for manufacturing of cooling towers. So, I'd like to share a few beneficial points of using the kind of film.

• In Film Fill, water forms a thin film on either side of fill sheets. Thus area of heat exchange is the surface area of the fill sheets, which is in contact with air.
• Due to fewer requirements of air and pumping head, Film Fill allow tremendous saving in power with the invention of film fill.
• Film Fills with higher flute sizes handle high turbid waters.

Also, taking with experts, confirmed that in case of sea water usage, low clog film fills are considered best for saving power and receiving optimum level of performances.