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Facworld Ezine 56 - Removing Particles from Air-Conditioning Systems   Message List  
Reply | Forward Message #64 of 70 |

***********************************************************

FACWORLD EZINE
The Facilities, Mechanical, Electrical Resource Center

***********************************************************


August 3, 2006
Editor: Thomas Yoon

contact: http://www.free-marine.com/emailform.htm
Publisher: Facworld Ezine


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IN THIS ISSUE
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Publisher's Note
Featured Ad
Article
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Publisher's Note
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Hi there,



Do you know that air-conditioning involves more than
controlling the temperature of the air? For stringent
climate control, the relative humidity, smells and
dusts are also controlled.

Today's topic is on air conditioning filters. These are
the tools to control dust particles from entering the
air-conditioned space. "Dust" could be a misnomer when
we enter into the world of cleanrooms. Even tobacco
smoke and bacteria are particles that can be filtered
off!


Prefilters

Having efficiencies ranging from 50% to 85%, prefilters
are used for protection against accumulations of textile
fibres and insects. They are ineffective in separating
smoke, pollen and staining particles like soot, oil mist.

Those with efficiencies above 85% are able to collect
pollen and have some limited effect against smoke and
staining particles. These are used in dehumidification
systems.

In textile industries, prefilters are used in
air-conditioning systems to protect heat exchangers,
humidifiers and fans. Window mounted air-conditioning
units use them for protecting the evaporator coils.
Those with 85% efficiencies are used to control dusts
from entering food handling premises and kitchens.


Fine filters

Fine filters are those with efficiencies ranging from
40% to 98%. Those in the 90% to 98% range are very
effective against staining particles like soot and oil
mist. They are also very effective against bacteria.

Their users includes air-conditioning for schools,
kitchens, filing rooms, light engineering workshops,
restaurants, and air curtains for food shops.

The higher ranges are suitable for operating theatres,
laboratories, and computers.


Absolute filters

Absolute filters are the most efficient filters around
with efficiencies ranging from 85% to more than 99.97%

They are highly efficient in collecting bacteria,
radioactive dusts and all kinds of smoke and aerosols.

They are used for constant climate precision measurement
or calibrating rooms, special clean air laboratories,
operating theatres, sterilization rooms, and clean rooms.



Until next time...


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http://www.free-marine.com

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Article
_______________________________________

The Mystery of Furry Animals


Comfort! Everyone wants comfort. Air-conditioning systems have
been invented for the purpose of providing comfort to the
inhabitants of buildings. The science of psychometry was
developed to understand the properties of the air - the
temperatures, humidity and the heat values.

However, the human body, a marvelous piece of creation can
adjust itself to changing climatic conditions to provide comfort
to the owner. It has become quite common knowledge that sweating
and their evaporation cools down the body.

Have you tried wrapping yourself in a plastic sheet? You will
feel warm because of the air trapped within the sheet. However,
after a while, you will sweat and you will feel very
uncomfortable indeed. Why?

It has to do with what air-conditioning people call the comfort
zone. According to them, most people will feel comfortable
between 70 to 78 degree Fahrenheit at about 50% relative humidity
wearing light clothing and when seated or at rest and without
much wind.

There is also a difference in comfort levels when we do different
activities. When we feel comfortable wearing woolen jackets to
keep warm while we are at rest, don't we feel uncomfortable when
we are running or doing strenuous activities? Clearly just
wearing a jacket will not automatically make us more comfortable.

On a hot day, you will want to take off everything. Well, society
dictates that you cannot do that, or you will be charged with
indecent behavior. Anyway, that's the easiest way to become
comfortable. The body's thermoregulatory action will make your
comfortable automatically.

In nature, the body has a very good self-temperature regulatory
action. When we sweat, the latent heat of vaporization takes away
the heat from the body. However, if the sweat were to be
evaporated, a person with all the sweat glands fully opened up
can even feel a chill. Putting on clothing will hinder that
process of evaporation.

In cold weather, how would you want to wear just a thin piece of
clothing, instead of layers after layers of thick clothing? You
don't want to look like an astronaut with their bulky suit, do
you? You might look a bit too fat and clumsy!

Moreover, some clothing will retain the water, so much so that
even when the outside is cold, you are actually sweating inside.
That's the condition of condensation. The same thing happens when
a glass of cold water is put in a warm atmosphere. The water
comes out from the air around the glass and become water droplets.
Your body becomes wet from your perspiration.

You become uncomfortable.

How do furry animals keep warm or cool? They don't wear clothing
like humans. They seem to be able to adjust their body
temperatures in their fur to all weather conditions. Can that be
duplicated?

Scientists have been searching for the solution to comfortable
all weather clothing for ages. They were searching for that
special fiber that can duplicate the thermoregulatory action of
a human body and yet feels comfortable to wear.

They have tried using capillary action of closely spaced fibers
to draw the liquid from the sweat to the surface and then to
evaporate. However in order to be effective, the fabric need to
be worn close to the skin in order to transport the moisture.
Whenever the capillary fabric gaps, the draw is broken and it
becomes ineffective. The result - heat is lost for the wearer.
Wearing tight clothing can be quite uncomfortable sometimes.
Maybe they are not so fashionable, or just do not fit the many
different body sizes.

The latest technological breakthrough lies in utilizing
electrostatic charges in the fibers. Scientists are now able to
move moisture from the body whenever a wearer perspires in warm
temperatures using electrostatic charges in the fibers. As the
wearer's activity decreases, the fabric will reduce the
evaporative process, leaving a constant water barrier between
the wearer and the fabric.

In cold temperatures, a layer of 100% relative humidity is
formed between the skin and the fabric, creating an area of moist
air that holds more heat during cooler temperatures. By using
electrostatic charges to pull the moisture away from the skin,
scientists are able to increase the heat capacity of the trapped
air next to the skin and the wearer feels warm.

Individual molecules are separated much faster and thus favor
evaporation.

These fibers are special.

They actually duplicate and enhance the thermoregulatory actions
of the body! They create a vapor barrier to keep you cool when
the weather is warm and warm when the weather is cold.

Truly a technological breakthrough!

-------------------------------------------------------------

Now, you too can Enjoy Comfort in Any Extreme Weather Conditions!
The world's most advanced Electrostatic Fabrics give comfort in
both warm and cold weathers.
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* Only 1 free ad per month, per subscriber.
* Maximum of 65 characters per line.
* Solo Ads 30 lines, including url and email address.
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~Disclaimer: Facworld provides Ad listings
and opportunities as a service for our subscribers.
Although we do make an effort to verify offers, we do not
accept responsibility for the validity of the information
presented. Please conduct your own evaluation of offers.

------------------------------------------------------------
Contact Information
------------------------------------------------------------

Thomas Yoon, Publisher/Editor
4186 Bagan Luar Road
12000 Butterworth
Malaysia

Contact me at http://www.free-marine.com/emailform.htm


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