What is Air cooler ? How it works ?

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The basic function of air-conditioning is to maintain the temperature, humidity and air quality in such a way that human feel comfortable. 

But the initial cost and maintenance cost of the AC unit is higher and everyone can't afford it.

So there is a need for an alternative, Air cooler or evaporative cooler fulfil this need.

YouTube vedio for Air-Cooler -

 








A typical air cooler consists of a Fan, motor, water pump and cooling media as shown in the diagram. Entire parts are assembled in a container which opening. 

From the front opening— air is forced in the room and air pulledf rom  remaining (side and back) opening.





Warm air is pulled from atmosphere by a fan-operated by a motor, and it passes over wet pad i.e. cooling media and water absorbs the heat from the air causing the water to evaporate. The cool (moisturized) air supplied to the room for cooling.

A small pump is used which pump water from the tank to in pad or cooling media.

Ho ever the vapour formed mixes with outside air so the air supplied inside the room has higher humidity as compared to the outside air.

Since the cooling of air taken place due to evaporation of water, this process is called evaporative cooling and system is called evaporative cooler.

In this process, heat is transfer is within the system i.e. sensible heat given out by air is received back as latent heat. That's the reason it is also called as adiabatic cooling or isenthalpic cooling.

Mostly it is used in the hot and dry zone. In industrial area evaporative cooler is very popular. In industrial cooler, multiple nozzles used to spray water on pads which increases the efficiency of cooler. In some places double stage evaporative cooling units used for better efficiency.

Mostly woodwoool and honeycomb is used as a cooling pad and it's thickness is about 40 to 50 mm for home air cooler.

Both the cooling pad are effective but life of honeycomb type cooling pad is more as compared to woodwoool.

Life of honeycomb is around 3-4 years and woodwoool can be used for one year.

Cost of replacement of honeycomb is around Rs.1000 to 1500 for room air cooler and for woodwoool will be Rs.250 to 400.

Water retention capacity of honeycomb is more as compared to woodwoool.

Woodwoool generate foul smell of not regularly or properly cleaned.


Cooling of air depends on the following parameter

1. Dry bulb and wet bulb temperature of incoming air.

2.Thickness of pad

3.Air velocity

4.Water circulation and its temperature.

Type of Air Cooler 

Desert Cooler 

It is mostly placed outside the window. It consumes more power, water and place as it is used for a large area.

-Available with large take(30-60L) size and suitable for a large area.

-Fan is used for cooling

-Suitable for dry area

Room Cooler 

It is used for household purpose and kept inside the room. Trolly use to move inside the room. It is ideal for a small area.

-Available with large take(20-30L) size and suitable for a small and medium area.

-Blower is used for cooling

Advantage of Air Cooler 

1.Capital cost is less.

2.Running and maintenance cost is less.

3.It uses air and water which is readily available.

The disadvantage of Air Cooler

1.The lowest temperature of the air that can be achieved is wet bulb temperature of outside air, due to that it is most effective in dry areas and it is not effective in the rainy season or humid areas.

2.Air supplied in the room have high humidity and can affect asthma patients a can creates respiratory issues. Sometimes high humidity affect walls electrical equipment.

3.Can not set a specific temperature.

Things to be taken care 

1. Place air cooler in front of the window for proper ventilation.

2. Clean cooler on a regular interval.

3. Add ice in water or cold water for instant and effective cooling.

Brands selling air cooler in India

1. Symphony

2. Voltas

3. Bluestar

4. Bajaj

5. Crompton

6. Orient

7. Havells

8. Kenstar

9. Usha 

10.hindware







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