The document describes the design and construction of a small-scale cooling tower for a laboratory. It uses wood wool to lower the temperature of hot water poured in from the top, as the water passes through layers of wood wool on its way to the outlet at the bottom. A rotating plastic fan helps move the water through the tower. Materials used include stainless steel, wood wool, plastic, and PVC pipes. The total estimated cost is between $50-$70.

1. Cooling Tower at small scale
laboratory Model
Prepared By
Sagar R Bavarva
G. H. Patel College of Engineering &
Technology
20th February, 2012

2. Principle
When the supply of hot water around 80ᵒ C temperature is
poured inside the tower from top inlet the rotating rotor
exerted a wind force which allows water to lower its
temperature to some extent, as soon as hot water comes in
contact with levels of wood wool from top to bottom the
wood wool starts soaking the heat energy released from the
hot water and through this it lowers the temperature of hot
water to 20ᵒ C to 30ᵒ C.

3. Function of Cooling Tower
• Generally it is observed in chemical industry that the usage
of cooling tower is like a coolant only, where hot water is
evaporated into steam which is collected into a tank and
through this cool water is supplied to the entire plant.
• Here the measurements which are taken in the construction
of cooling tower are approximated and calculated as per
laboratory level only.

4. Materials used in construction
• Stainless steel for tower (Type SS- 323)
• Plastic rotor for exhaust fan.
• Wood wool bush for internal chamber
• Square Steel Basket for stand (Type SS-320)
• PVC pipe for inlet of water supply
• Electric motor of 250 watts
• Stainless Mesh for internal layer
(Mesh Size = 1cm × 1cm)

5. Steps for Construction
• A square rectangular shaped tower from Stainless steel is
created about 5ft long in size, where at the bottom of it a
conical outlet duck it kept open through which the base
water can be easily collected into another tank.
• At the upper portion of the tower an electric motor of 250
watts is connected with an electric supply through which a
plastic rotor is also attached when starts rotating while
coming in contact with electricity.
• About ½ inch of PVC pipe is inserted in between the
portion of rotor and first layer of wood wool from top,
where it is used as an inlet for hot water.

6. • Here four to five internal layers are there inside the chamber
made up of stainless steel mesh size 1cm × 1cm where a
layer of wood wool bushes on each level is used to lower
the temperature of the hot water supplied from the top and
which slowly cools down when it reaches to the bottom of
tower outlet.
• At the bottom portion of the tower a stand is kept of 2.5 ft
size.

7. Cost Estimation
• Stainless steel = $ 12
• Plastic Rotor = $ 3 per piece
• Wood wool = $ 2 per 100 gm
• PVC Pipe = $1 per piece (length of pipe = 2ft)
• Electric Motor of 250 watts = $ 20
• Stainless steel mesh = $ 12
Total price is about $50 to $70 approx.

8. Cooling Tower Final Design