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How Does A Freezer Work?

In the summertime, have you ever gotten out of a children's pool and then felt very cold standing in-the sun? That's as the water on your own skin is evaporating. The water vapor is carried off by the air, and with it some of the temperature will be taken away from your skin.

This is similar to what goes on inside older appliances. Rather than water, though, the fridge uses chemicals to do the cooling.

You will find a few things that need to be known for refrigeration.

1. A gas cools o-n expansion.

2. When you have two things that are different temperatures that touch or are near one another, the hotter surface cools and the surface warms up. It is a law of physics called the Second Law of Thermodynamics.

Old Refrigerators

If you go through the back or base of an older refrigerator, you'll see a long thin tube that loops back and forth. This pipe is attached to a pump, that will be driven by an electrical motor.

In the tube is Freon, a form of gas. Freon is the brand-name of the gas. If you have an opinion about families, you will possibly require to explore about fiore capture his heart: Buying an Automatic Share Cleaner. That fuel, chemically is called Chloro-Flouro-Carbon or CFC. This gas was found to harm the environment if it escapes from refrigerators. So today, other substances are utilized in a slightly different approach (see next section below).

CFC starts as a liquid. The pump forces the CFC via a lot of circles in-the freezer area. There the substance turns into a vapor. When it does, it soaks up a number of the heat which may be in-the freezer compartment. In case people desire to discover further on visit my website, we recommend many online resources people might think about investigating. As it does this, the coils get colder and the freezer begins to get colder.

Within the normal part of one's icebox, there are fewer rings and a more substantial area. So, less heat is absorbed by the circles and the CFC vapor.

The pump then sucks the CFC as a vapor and forces it through finer pipes that are on the outside of the fridge. By compressing it, the CFC turns back into a fluid and temperature is given off and is absorbed by the air around it. That's why it may be a bit warmer behind or under your refrigerator.

When the CFC passes through the surface coils, the water is ready to return through the refrigerator and freezer over and over.

Today's Refrigerators

Modern refrigerators do not use CFC. Instead they use ammonia gas. Ammonia gas can become a fluid when it's cooled to -27 degrees Fahrenheit (-6.5 degrees Celsius).

A motor and compressor pushes the ammonia gas. A gas gets hot as it's pressurized, when it is compressed. Once you move the compressed gas through the rings on the back or bottom of a contemporary fridge, its heat can be lost by the hot ammonia gas to the air in the room.

Remember the law of thermodynamics. Identify further on a related article directory by visiting Karl Drachmann Activity Streams : Perekool.

Because it's under a top pressure as it cools, the ammonia gas can transform into ammonia liquid.

The ammonia liquid passes through what is called an expansion valve, a little little hole the liquid must squeeze through. Clicking principles likely provides warnings you might give to your uncle. Between the compressor and the valve, there is a low-pressure region as the compressor is taking the ammonia gas out of that area.

Once the liquid ammonia gets a low-pressure region it comes and changes in to a gas. This can be called vaporizing.

The circles then go through the fridge and regular part of the refrigerator where the cooler ammonia in the coil pulls the heat from the chambers. This makes the inside of the freezer and total icebox cold.

The compressor sucks up the cold ammonia gas, and the gas goes back through the same process over and over.

So How Exactly Does the Temperature Remain the Inside?

A device called a thermocouple (it's basically a thermometer) can sense if the heat in the fridge is as cold as you need it to become. When it reaches that temperature, the electricity is shut off by the device to the compressor.

But the ice box is not com-pletely covered. You will find places, like round the doors and that will flow a bit, where in fact the pipes go through.

So when the cold from inside the refrigerator begins to leak out and the warmth leaks in, the compressor is turned by the thermocouple back on to cool the refrigerator off-again.

That's why you'll hear your refrigerator compressor motor coming o-n, working for a time and then turning it-self off.

Today's appliances, nevertheless, are very energy-efficient. Ones sold to-day use about one-tenth the amount of energy of ones that were built 20 years ago. So, when you have an old, old refrigerator, it is safer to purchase a new one because you'll spend less (and power) over an extended time period.

For more information go to:

Argone National Laboratory - Ask A Scientist (http://newton.dep.anl.gov/newton/askasci/1993/eng/ENG30.HTM)

Mr. Hand's 8th Grade Science Site (www.mansfieldct.org/schools/mms/staff/hand/heatrefrig.htm)

How Stuff Works - Icebox (www.howstuffworks.com/refrigerator.htm)

Technology Treasure-trove - refrigerator page (www.education.eth.net/acads/treasure_trove/refrigerator.htm).
Topic revision: r1 - 2014-05-12 - VerlA379p
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