How does a Refrigerator compressor work.?

Question

I just want to know the working principal of a compressor motor.

Answer 1

Parts of a Refrigerator

The basic idea behind a refrigerator is very simple: It uses the evaporation of a liquid to absorb heat. You probably know that when you put water on your skin it makes you feel cool. As the water evaporates, it absorbs heat, creating that cool feeling. Rubbing alcohol feels even cooler because it evaporates at a lower temperature. The liquid, or refrigerant, used in a refrigerator evaporates at an extremely low temperature, so it can create freezing temperatures inside the refrigerator. If you place your refrigerator's refrigerant on your skin (definitely NOT a good idea), it will freeze your skin as it evaporates.

There are five basic parts to any refrigerator (or air-conditioning system):



Compressor

Heat-exchanging pipes - serpentine or coiled set of pipes outside the unit

Expansion valve

Heat-exchanging pipes - serpentine or coiled set of pipes inside the unit

Refrigerant - liquid that evaporates inside the refrigerator to create the cold temperatures

Many industrial installations use pure ammonia as the refrigerant. Pure ammonia evaporates at -27 degrees Fahrenheit (-32 degrees Celsius).



The basic mechanism of a refrigerator works like this:











The compressor compresses the refrigerant gas. This raises the refrigerant's pressure and temperature (orange), so the heat-exchanging coils outside the refrigerator allow the refrigerant to dissipate the heat of pressurization.



As it cools, the refrigerant condenses into liquid form (purple) and flows through the expansion valve.



When it flows through the expansion valve, the liquid refrigerant is allowed to move from a high-pressure zone to a low-pressure zone, so it expands and evaporates (light blue). In evaporating, it absorbs heat, making it cold.



The coils inside the refrigerator allow the refrigerant to absorb heat, making the inside of the refrigerator cold. The cycle then repeats.

This is a fairly standard -- and somewhat unsatisfying -- explanation of how a refrigerator works. So let's look at refrigeration using several real-world examples to understand what is truly happening.

Answer 2

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refrigeration system -- a compressor, condenser, expansion valve, and evaporator. In the evaporator section, a refrigerant (up until very recently it has been "DuPont's Freon (TM)-12", or dichlorodifluoromethane) is vaporized, and heat is absorbed through the inside walls of the refrigerator, making it cold inside. DuPont's Freon (TM)-12 boils at -6.6 C (about 20 F) when pressurized at 35.7 pounds per square inch, so evaporator temperature is maintained at or near that temperature if the refrigerator is working properly. In the next stage, an electric motor runs a small piston or Wankel compressor (some new compressors are vane type) and the DuPont's Freon (TM)-12 is pressurized. That raises the temperature of the DuPont's Freon (TM)-12. The resulting super-- heated, high-pressure gas (it is still a gas at this point) is then condensed to a liquid in an air-cooled condenser. On most refrigerators, the compressor is on the bottom and the

condenser coils are on the rear of the refrigerator. From the condenser, the liquid DuPont's Freon (TM)-12 flows through an expansion valve, in which its pressure and

temperature are reduced the conditions that are maintained in the evaporator. The whole process operated ontinuously, by transferring heat from the evaporator section (inside the refrigerator, to the condenser section (outside the refrigerator), by pumping the DuPont's Freon (TM)-12 continuously through the system described above. When the desired temperature is reached, the pump stops and

so does the heat transfer. Freezers and air conditioners work exactly the same way. The difference is mostly in their compressor capacities and differing pressures. For example, to maintain -20 F (-29 C), as with a frozen

food freezer, DuPont's Freon (TM)-12 must maintain a pressure of 15.3 pounds per square inch in the evaporator section. Because of the concerns regarding chlorofluorocarbons in the past several years, new refrigerators do not use DuPont's Freon (TM)-12 any more. In fact, in years gone by (I will show my age here),

refrigerators used Ammonia as a refrigerant! New materials to replace DuPont's Freon (TM)- 12 have been developed, and are currently being developed. Now to totally

confuse you, there are some refrigerators that use the absorption system of heat transfer. These refrigerators are operated usually by natural or LP gas. In these refrigerators a strong solution of ammonia in water is heated by a gas flame in a container called a generator, and the ammonia is driven off as a vapor. The ammonia vapor then goes into a condenser, where it is changed to

its liquid state. The ammonia then flows into the evaporator, just like a conventional system. But, instead of the gas being brought into a compressor after leaving the evaporator, the ammonia gas is reabsorbed in the partially cooled, weak solution returning from the generator, making it a strong ammonia solution, again. This process happens in another small container called, you

guessed it, the absorber. From there this concentrated solution flows back to the generator to complete the cycle. This is the type of refrigerator that is seen most often in campers and RV's.

Answer 3

How Does A Compressor Work

Answer 4

It's not quite as the first answer states.



#2 answer has it right on the money!



Compressing the refrigerant actually creates heat. Then the release of the pressure through a small opening creates the cold, removing the heat from the inside of the frige.



An easy way to see this is by spraying a can of dust off and feel how cold the can gets.

Do in a well ventilated area, and do not attempt to huff it...

Answer 5

The compressor compresses the refrigerant gas. This raises the refrigerant's pressure and temperature (orange), so the heat-exchanging coils outside the refrigerator allow the refrigerant to dissipate the heat of pressurization.

Answer 6

Use a clamp on amp meter to determine start up amps. The compressor will only show start up, or lock rotor amps for a few (2-5) seconds before the start winding drops out.

Answer 7

Freezing agent was compressed by the compressor, reducing its temperature and releasing heat. When the agent gets into the frige, the agent absorbs the heat inside and be pumped back to the compressor.