hey pls answer me?

Question

I need 7 pages on how refrigerators work, and their technology. can you give me sites on this?

Answer 1

The title of this site is "How does a refrigerator work?"
http://www.energyquest.ca.gov/how_it_works/refrigerator.html

Answer 2

I got this from http://www.energyquest.ca.gov/how_it_works/refrigerator.html
hopefullly this helps a little
In the summertime, have you ever gotten out of a swimming pool and then felt very cold standing in the sun? That's because the water on your skin is evaporating. The air carries off the water vapor, and with it some of the heat is being taken away from your skin.

This is similar to what happens inside older refrigerators. Instead of water, though, the refrigerator uses chemicals to do the cooling.

There are two things that need to be known for refrigeration.

A gas cools on expansion.
When you have two things that are different temperatures that touch or are near each other, the hotter surface cools and the colder surface warms up. This is a law of physics called the Second Law of Thermodynamics.


Old Refrigerators
If you look at the back or bottom of an older refrigerator, you'll see a long thin tube that loops back and forth. This tube is connected to a pump, which is powered by an electric motor.

Inside the tube is Freon, a type of gas. Freon is the brand name of the gas. This gas, chemically is called Chloro-Flouro-Carbon or CFC. This gas was found to hurt the environment if it leaks from refrigerators. So now, other chemicals are used in a slightly different process (see next section below).

CFC starts out as a liquid. The pump pushes the CFC through a lot of coils in the freezer area. There the chemical turns to a vapor. When it does, it soaks up some of the heat that may be in the freezer compartment. As it does this, the coils get colder and the freezer begins to get colder.

In the regular part of your refrigerator, there are fewer coils and a larger space. So, less heat is soaked up by the coils and the CFC vapor.

The pump then sucks the CFC as a vapor and forces it through thinner pipes which are on the outside of the refrigerator. By compressing it, the CFC turns back into a liquid and heat is given off and is absorbed by the air around it. That's why it might be a little warmer behind or under your refrigerator.

Once the CFC passes through the outside coils, the liquid is ready to go back through the freezer and refrigerator over and over.



Today's Refrigerators
Modern refrigerators don't use CFC. Instead they use ammonia gas. Ammonia gas turns into a liquid when it is cooled to -27 degrees Fahrenheit (-6.5 degrees Celsius).

A motor and compressor squeezes the ammonia gas. When it is compressed, a gas heats up as it is pressurized. When you pass the compressed gas through the coils on the back or bottom of a modern refrigerator, the hot ammonia gas can lose its heat to the air in the room.

Remember the law of thermodynamics.

As it cools, the ammonia gas can change into ammonia liquid because it is under a high pressure.

The ammonia liquid flows through what's called an expansion valve, a tiny small hole that the liquid has to squeeze through. Between the valve and the compressor, there is a low-pressure area because the compressor is pulling the ammonia gas out of that side.

When the liquid ammonia hits a low pressure area it boils and changes into a gas. This is called vaporizing.

The coils then go through the freezer and regular part of the refrigerator where the colder ammonia in the coil pulls the heat out of the compartments. This makes the inside of the freezer and entire refrigerator cold.

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



How Does the Temperature Stay the Same Inside?
A device called a thermocouple (it's basically a thermometer) can sense when the temperature in the refrigerator is as cold as you want it to be. When it reaches that temperature, the device shuts off the electricity to the compressor.

But the refrigerator is not completely sealed. There are places, like around the doors and where the pipes go through, that can leak a little bit.

So when the cold from inside the refrigerator starts to leak out and the heat leaks in, the thermocouple turns the compressor back on to cool the refrigerator off again.

That's why you'll hear your refrigerator compressor motor coming on, running for a little while and then turning itself off.

Today's refrigerators, however, are very energy efficient. Ones sold today use about one-tenth the amount of electricity of ones that were built 20 years ago. So, if you have an old, old refrigerator, it's better to buy a new one because you'll save money (and energy) over a long period of time.

Answer 3

put all 7 pages in refrigerator, and next day show them to teacher and tell her "look, this way a refrigerator works".

Answer 4

Here are some websites with information:

http://www.cooledwater.com/technology/how_fridges_work.asp
This site has a small paragraph and a diagram

http://home.howstuffworks.com/refrigerator.htm
This site has a lot of information and is complimented with some supporting diagrams

http://en.wikipedia.org/wiki/Fridges
this site has a large paragraph on how fridges work as well as a lot of other information

i hope these websites will help you with your 7 page homework - Good Luck!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 5

try wikipedia .com type in refrigerator or something you have to get something out of that place always answers for anything

Answer 6

The secret of refridgerators is that it`s much colder inside them than it is outside, you could probably fill seven pages with the contents, ice cubes, eggs, vegetables, mineral water, etc. etc.

Answer 7

depends on how much detail you need mate. plenty of info on the net. try a few engineering/science sites. its something to do with condensing air or something like that.

Answer 8

Click on links below for two good references:
Wikipedia: http://en.wikipedia.org/wiki/Refridgerator
How Stuff Works: http://home.howstuffworks.com/refrigerator.htm

Hope this helps!

Answer 9

7 pages ! holy crapp

Answer 10

Yeah definately go to Wikipedia

en.wikipedia.org

It's like the only website you need to use in your LIFE for homework. Trust me. I did it.