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The Facilities, Mechanical, Electrical Resource Center


June 1, 2002
Editor: Thomas Yoon
Publisher: Facworld Ezine


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Publisher's Note

Hi there,

Expansion Valve

In the refrigeration cycle, the refrigerant must
undergo a change in state in order for the heat to
be absorbed from the environment.

The refrigerant has the property of changing its
state from liquid to vapor at normal room temperatures.

Have you ever felt your skin becoming cool whenever
you put alcohol on it? Or even when a bit of petrol
spilled onto your hands? It's because, the alcohol
or petrol has evaporated when it comes in contact
with your skin.

The result - heat is removed from your skin, and it
feels cool!

In a closed-loop refrigeration circuit, the change
of state from liquid to vapor is achieved
mechanically by pressurizing the liquid at one
end and forcing it through a small opening at
another end.

Once the liquid comes out from the small opening,
it expands into vapor. The effect is similar to the
spray you get when you restrict the outlet of your
garden hose. But water is not a refrigerant. It does
not feel cold because it does not change to a vapor.

Bad example. But you get the idea? Pressurized
restriction causes spray at the other end.

In many refrigeration circuits, the small opening
is made in the form of a thermostatic expansion valve.
Many other designs make use of small capillary tubes.
In big chillers, orifice plates are common.

All of them achieve the same purpose - to expand the
liquid to become vapor and to cause the evaporator
tubes to become cold.

Until next time…

Thomas Yoon
Editor, Facworld Ezine
More information can be obtained at


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Contact Information

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

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