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FACWORLD EZINE 
The Facilities, Mechanical, Electrical Resource Center

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May 2, 2003
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 
Facworld Free Classified Ads
Guidelines for placing ads
Advertising Rates
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Publisher's Note 
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Hi there,

Centrifugal chillers are used for cooling large buildings in 
a centralized air conditioning system. There are other types 
of chillers using screw compressors and reciprocating 
compressors. These are usually smaller in size. Today's topic 
is about centrifugal chillers - the ultimate choice for any 
air conditioning installations higher than 500 RT 
(refrigeration tons)

Basically, centrifugal chillers use centrifugal fans to move 
the refrigerant within the chiller circuit. As with any 
refrigeration circuit, there must be a compressor, a 
condenser, an expansion device, and the evaporator. 

In the case of the centrifugal chiller, the fan is the 
compressor. Rotating at very high speeds, it is capable of 
pressurizing the refrigerant gas so as to increase its 
temperature. Because the pressure is so dependent on the 
efficiency of the impeller of the compressor, the impeller 
is very carefully designed to match the system.

The clearances between the impeller and the housing at the 
mouth ring (impeller suction) are made very small so as to 
reduce leaks back to the discharge.

Usually inlet vanes that throttle the gas control the flow 
of the gas, and thus the chiller load. The expansion of 
the liquid to gas is usually made through a fixed orifice.

The lubrication of the shaft bearings must be done within 
the chiller itself. Oil passages and shaft driven pumps 
(with motor driven pumps at startup) is made for 
lubrication.

The oil will find their way to the condenser and has to be 
extracted back to the lubrication system. Usually there 
will be an eductor system to suck back the oil to the oil 
sump.

Centrifugal chillers are usually designed for low-pressure 
refrigerant like R-123a.

These chillers sometimes surge when running, and they are 
very sensitive to sudden changes in loads. Therefore 
modern centrifugal chillers make use of electronic 
microprocessors to control the various parameters and 
timing in order to run smoothly.

Indeed, when everything is perfect, the centrifugal 
chiller is capable of extremely smooth operation.

Folks, be cool!

Until next time…

Thomas Yoon
Editor, Facworld Ezine
More information can be obtained at 
http://facworld.tripod.com

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Article 
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Get Your Point Across with Comparisons


How do you get complex selling points across quickly? Instead of
trying to explain a new concept from scratch, make a comparison.
Use your audience's prior knowledge about something else to make
a statement about your product or service. In essence, you are
just taking what your customers know already, and then "tweaking"
it a little bit to help make your point.

There are at least two ways that you can use comparisons in your
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1) Comparison and Contrast: Simply use people's knowledge of some
product and service and then show how yours is different and
better. This allows you to focus your valuable "message time" on
the benefits and advantages of your offer.

For instance, if you were trying to market a new software
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processor!" By phrasing it this way, you can do a lot of
explanation in just a few words. You are also doing the one thing
that we all desire -- you are distinguishing yourself from your
competitors.

2) Analogy: In an analogy, you help people understand your idea
by showing how it is similar to something else. This, of course,
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confusion!

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* Only 1 free ad per month, per subscriber. 
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Featured ads US$10.00 -7 lines including url, 65 characters/line 
Sponsored ads US$7.00 - 5 lines including url, 65 characters/line 


Payment for paying ads can be made by credit card at:

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To SUBSCRIBE or join this Newsletter: 
send an email to: 

mailto:facworld-subscribe@yahoogroups.com

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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. 

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Contact Information 
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Thomas Yoon, Publisher/Editor
4186 Bagan Luar Road
12000 Butterworth
Malaysia
604-4095166

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


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