Evaporative coolers lower air temperature by employing water's high enthalpy of vaporization. As air passes over water, the water evaporates and absorbs heat from the air, lowering its temperature. This process converts sensible heat in the air to latent heat in water vapor. Most coolers contain fans that blow this cooler air into rooms, as well as a water source to replenish the evaporating water. While cheaper to operate than vapor-compression coolers, evaporative coolers increase humidity and require more maintenance.

1. COOLING MECHANISM IN
WATER COOLER

2. INTRODUCTION
An evaporative Cooler (also swamp Cooler,desert cooler & wet air cooler )
Is a device that cools air through the evaporation of water.Evaporative
Cooling differs from typical air conditioning systems which use vapour-
Compression or absorption refrigeration cycles.Evaporative cooling
Works by employing water’s large enthalpy of vaporization.

3. PHYSICAL PRINCIPLES
• Evaporative cooling is the addition of water vapour into
air,which causes a lowering of the temperature of the
air.The energy needed to evaporate the water is taken
from the air in the form of sensible heat,which affects the
temperature of the air,& converted into latent heat,the
energy present in the water vapour component of the
air,whilst the air remains at a constant enthalpy value,the
water vapour component or the air, whilst the remains at
a constant enthalpy value.This conversion of sensible heat
to latent heat is known as adiabatic process because it
occurs at a constant enthalpy value.

4. WORKING
• Most of the cooler available today are evaporative coolers also
known as swamp coolers.In these coolers,air from outside is
passed bn over water.The water takes up the heat from the outside
air & it evaporates.Hence due to the transfer of heat from air to
water,the temperature of air decreases,making it comparatively
cooler. This cool air is then directed inside the room.This process
repeated constantly brings down the overall temperature of the
room making it pleasant during a hot sunny day.

6. VARIOUS PARTS
• 1. Fan & Vents- A fan is needed to direct the cool air
towards the room.These fans continuously flow cool air in
the room.
• 2.Water source- Evaporative cooler used water so it is
necessary to fill the cooler with water so that the cooling
can take place.

7. ADVANTAGES &
DISADVANTAGES
ADVANTAGES
1. Air is always available.
2. Maintenance cost normally less than water cooled system.
3. In event of power failure they can transfer some heat because of natural
convention.
4. DISADVANTAGES
5. 1.Health hazards.
. 2.Maintenance