Expansion for Heat Absorption
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?
"Tap traditional but EFFECTIVE INFORMATION!" Magazines have more information that you can use. http://www.free-marine.com/linkmagazinecity.h tm
Many years of working experience in Marine, Facilities, Construction has given the author material for writing e-books and articles related to engineering, and management. Subscribe to facworld ezine at mailto:facworld-subscribe@yahoogroups.com More information at http://www.free-marine.com and http://www.free-engineering.com
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New York Times - The bailout plan gives Henry M. Paulson Jr., the Treasury secretary, three broad choices in buying assets. By ALAN S. BLINDER THE House of Representatives was against the bailout bill before it was for it. US firms up plan to buy into banks to stem crisis Paulson Indicates Need to Purchase Bank Equity `Soon as We Can' Publ.Date : Sat, 11 Oct 2008 20:39:07 GMT GOP Officials Hope for Stability From McCain - New York Times
New York Times - By ADAM NAGOURNEY and ELISABETH BUMILLER Republican leaders across the country said Saturday that they were worried that Senator John McCain was heading for defeat unless he brought stability to his presidential candidacy and settled on a clear message ... Antiwar Protestor Disrupts McCain Iowa Rally Obama needs 75 percent turnout in Philadelphia, says Rendell Publ.Date : Sat, 11 Oct 2008 22:23:47 GMT World is united to tackle financial crisis, IMF says - MarketWatch
MarketWatch - By Rex Nutting WASHINGTON (MarketWatch) -- Financial policymakers from 180 nations around the world are united in their resolve to tackle the financial crisis, Youssef Boutros-Ghali, head of the International Monetary Fund's policy committee, ... G7 nations face going cap in hand to China Finance officials comments at IMF meetings Publ.Date : Sat, 11 Oct 2008 21:23:46 GMT YouTube to play full TV episodes with ads - Afterdawn.com
Afterdawn.com - Google has announced that it will begin offering full-length TV episodes through its YouTube platform beginning this week, thanks to a content deal with CBS. YouTube to Offer TV Shows With Ads Strewn Through YouTube beams up Star Trek for long-form video, prominent new ads Publ.Date : Sat, 11 Oct 2008 21:13:12 GMT Website Traffic Promotion |
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