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An evaporative cooler is basically a large fan with
water-moistened pads in front of it.
The fan sucks the warm air from outside
through the moistened pads and blows the resulting cooled air through your
office or home.Water is supplies to the pads through small “supply” lines. This water then
soaks the pads and drizzles through them to collect at the bottom of the cooler.
A small water pump then circulates the water back to the top and the process
continues
As water is being continually lost through evaporation, it is essential that
you have a good float valve (similar to the one used in toilets) that adds water
to the evaporative cooler when levels start to get low.
A large fan then extracts air through the pads and evaporation cools the
temperature of the air, which is then blown through your home cooling it.
TIP – To get you evaporative cooler to work
effectively, the cooled air must be allowed to leave you home. So by
strategically choosing which windows you leave open, you can direct the flow of
cool air through your home or other building.
AS The temperature of the
remaining water drops , water is evaporated by the moving air. Heat and energy
is carried away by the faster moving molecules as water in the
Air Cooler evaporates.when the water evaporates the air near the
surface increases its relative humidity and would slow down the evaporation if
it was not blown away and replaced with air with a low relative humidity. The
wind from the Evaporative cooler fan increases evaporation and
the rate the energy leaves the liquid water.
Temperatureis a measure of the energy
in the water.Since the energy in the remaining
water is dropping so too is the temperature of the remaining water. The same
thing happens when you lick the back of your hand and blow on it. Top 7 Reasons to Purchase an Air Cooler Healthy life style Some types of air coolers, provide comfort to people with allergies and rest.It feels cool.
This is how an evaporative cooler works. Water is pumped over
porous pads where air is drawn through causing the water to
evaporate and cool the air.
Theresult is that hot dry
air is converted into cool moist air that is blown into a house for cooling. The
process works best when there is a good flow of air and the relative humidity of
the incoming air is below 30%. The efficiency (cooling
effectiveness) goes down with an increase in the relative humidity of
outside hot air.
Experiment - Examining relative
humidity effects on evaporative cooler operation
Evaporation Cooling Experiment Chart
In
many location where there is low
relative humidity, one effective and inexpensive means to cool houses and
businesses is with evaporative coolers. These use a fan to draw
hot, dry outside air through water wetted pads where evaporation of the water
cools the air. The cool moist air is then blown into the house and distributed
for cooling.This experiment allows you to input the outside air relative
humidity and the outside air temperature to obtain the temperature of the air
that is blowing from the Air Cooler into the house.
Evaporative Cooler Operation Illustration
What you find: For a given temperature of outside air, as
the relative humidity rises the temperature drop between the outside and inside
air becomes less and less. Top 7 Reasons to Purchase an Air Cooler: http://www.gzxingke.en.alibaba.com 1.Healthy life style Some types of air coolers, provide comfort to people with allergies and rest.For very dry air or low relative humidity,the
temperature drop can be 30 degrees or more. Temperatures greater than 80 degrees
in the output air to the house is usually considered too high and few people
will use them when this occurs.
