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AIR CONDITION ENGINEERS How does it get power?

Glutown320x480.pngThe main component of a refrigerator that needs power is the compressor (see below). It is essentially a pump which is driven by a motor. The motor can either be one that is powered by electricity (as in a home refrigerator), or a motor that is present for some other reason (for example, the engine in a motor vehicle provides power for the compressor in the air conditioning refrigerating system).


AC FIX NEBRASKA The Basic Refrigeration Cycle

Shown in the figure Glutown320x480.pngto the right is the basic refrigeration cycle. You can see that a Basic refrigeration system is comprised of four main components. All of these components work together to change the state of the refrigerant in the pipe-line. Let's talk about what these different components do.

AC UNIT DUCT Evaporator

This is the element which removes the heat from what you are trying to cool. In the case of an air conditioning refrigerating system, this would usually be the of a room. When the low temperature refrigerant passes through evaporator, it absorbs the heat from the room and becomes a low pressure vapor or gas. This process brings the temperature of the room down and the room turns cooler. This cool is then circulated back and forth in the room using fans, thus providing comfort to the occupants.

Glutown320x480.pngThe evaporator works in a method similar to putting a small amount of rubbing alcohol on your hand and letting it evaporate. The heat of your hand causes the liquid to turn into a gas, absorbing energy in the process and making your hand feel cooler. air conditioning refrigerating and other refrigeration equipment do the same, except on a much larger scale. Unlike rubbing alcohol on the hand, however, the refrigeration cycle will begin turning this evaporated gas back to a liquid on our next stop, the "compressor."




Glutown320x480.pngA compressor is a machine that can take a substance and pressurize it by forcing it into a small space. Think of the bike pump that you may use to refill your bike wheels--it uses your muscular energy to compress into a smaller volume. Now, if you pump the tires up for a while and place your hand near the part where the hose connects to the cylinder, it might feel quite warm. This is the result of compressing a gas into a smaller space: heat is released.

In a compressor, a powerful motor drives a piston or a high speed fan (called an impeller) that compresses the vaporized gas to a far higher pressure. But why is it needed for air conditioning refrigerating or refrigeration? After absorbing heat from room (and thus cooling it down), the refrigerant loses its pressure in order to keep its volume. This low pressure refrigerant may cause problems in circulating in the system and also make the condenser work very inefficiently. Therefore, at this stage, the compressor increases its pressure by compressing it and thus raising its temperature even further.

How do we get rid of all this heat, then? It's not good to put it back into the room where we're trying to cool! Thus, we release this hot gas to where it belongs in our next component, called the "condenser."


Glutown320x480.pngThis is the stage where the hot, high pressure gas exiting the compressor flows into a series of stacked pipes called the "condenser." It's usually placed somewhere else, away from the location to be cooled (like outside). Good ventilation, either through convection, forced (fans), or even water are thus used to keep this set of pipes cool so that we can get rid of all the heat built up so far. Essentially, the condenser's purpose is to transform the hot vaporized refrigerant back into a cooler liquid so that the refrigeration cycle can start once again.

Something you can observe similarly to a condenser is to watch how a cold metal spoon held over a boiling pot will build up small drops of water over a period of time. This is because the cooler surface of the spoon will lower the temperature of steam nearby, and cause the water molecules to come closer to each other, thus turning the steam back into liquid. Heat energy is releaed during this process, causing the spoon to get warm.

One last step remains before the cooling process can start over at the evaporator: the thermal expansion valve.

A/C SYSTEM FIX NEW JERSEY Thermal expansion valve

Glutown320x480.pngSo far, the refrigerant has been a low pressure liquid, a low pressure vapor, a high pressure vapor, and finally a high pressure liquid. Now we need a way to take all that pressure that the compressor has created out of the system. This is where the expansion valve comes in. It allows the refrigerant to expand and lose its pressure which causes a drastic reduction in temperature also. Now the refrigerant is a low pressure and low temperature liquid again, ready to go back through the evaparator and cool some more air!

The thermal expansion valve is a very important step in the refrigeration process. Think of it as a sort of carefully-drilled pinhole that separates a high pressure location from a low pressure location. The (now cold) high pressure liquid, coming out of the condenser, is trying very hard to force through such a small space into the evaporator, where it can once again boil and absorb heat. However, if the hole wasn't present, and instead a normal pipe were to be placed there instead, there would be no pressure difference, and no cooling would take place! Thus, manufacturers of air conditioning refrigerating , refrigerators, and other such equipment need to carefully choose the right expansion valve size so that the correct pressures are established. Too large of a difference (as in, a too-small hole), and the compressor might overheat, the evaporator could ice over, and other nasty problems might occur. Too small of a difference (a larger hole), and there wouldn't be enough cooling!

The thermal expansion valve's size dilemma could be solved in large refrigeration systems by placing a special "thermal bulb" near the part where the evaporator connects to the compressor. A long, thin tube connects the bulb to a large diaphragm mounted on the valve's body, which controls the size of the hole. The thermal bulb contains a mix of various liquids that makes it act a lot like a traditional alcohol thermometer you might've used when you get sick. Essentially, its purpose is to tell the valve when the evaporator temperature is too low (this means the hole is too small), or when the evaporator temperature is too high (the hole is now too big), and change the size of the hole so that the opposite effect will take place. Since the temperature of almost all of the pieces in the refrigeration system are always rising and falling, the thermal expansion valve's job "governs" the whole thing to cool at the right temperature--all the time.


Glutown320x480.pngNow you know the basic principles behind the refrigeration cycle. These principles can be applied to virtually any refrigeration system: your parents' car, your home's and school's air conditioning refrigerating , your refrigerator/freezer, and even odd items like soda and ice cream machines! Without refrigeration, we would be very uncomfortable and wouldn't be able to prevent things from getting too hot.


It isn't dangerous to people, but refrigerants in old refrigerators and air conditioning refrigerating were bad for the environment.

AC BTU What does it do?

It lowers the temperature of a space.

A/C SERVICE MARYLAND How does it vary?

Well i dont know??

AC TOOLS MANCHESTER How has it changed the world?

Refrigerators allow us to keep food longer. air conditioning refrigerating lets us cool down houses and buildings in the summer, reducing the chance of heat stroke.

A/C SERVICE MONTANA What idea(s) and/or inventions had to be developed before it could be created?

air conditioning refrigerating are surprisingly easy to understand. The refrigerant cycle can be a very exciting example of how useful changing matter can be. Refrigeration allows us to live our lives more comfortably and more cost effectively. With a couple of basic concepts you can be on your way to knowing all about AC&R, air conditioning refrigerating and refrigeration, in no time at all.


It is important to remember that air conditioning refrigerating systems do not cool the that passes through them, they remove the heat from it. Anytime two objects are placed near each other they have a tendency to equalize their respective temperatures. The greater the difference in temperature, the faster this heat transfer occurs. Heat transfer always occurs from a hot object to a cold object. Heat transfer occurs through one of three ways: radiation, convection, and conduction.


Radiation is when heat moves through a surface without that surface contacting the origin of the heat. For example, if there is a fire in the fireplace, the fire will radiate heat and you will be able feel it if you are nearby, even though you are not touching it. -


Convection is the natural circulation of heat. You may already know that warmer rises and cooler sinks. This process is known as convection. Many objects that we use every day use this principle, for example, an oven. You place your food in the middle of an oven with heating elements at the bottom. The elements heat up the and it rises until it cools enough to begin sinking where it is heated again by the elements, thus creating a circulation of the inside the oven.


Conduction is probably the form of heat transfer that you are most familiar with. Conduction occurs when two materials come into contact with each other. For example, you place your hand on a hot plate. By coming into direct contact with the plate you allow the heat to be transferred to your much cooler hand.Glutown320x480.png

You now know the basic principles of heat transfer, the single most important concept when learning how an air conditioning refrigerating operates.


Before we continue we will review the states of matter and how they relate to each other. Matter exists in four states: solid, liquid, gas, and plasma. Matter can change states when heat transfer occurs. By heating a liquid you can cause it to become a gas. For example; water exists in three states, solid (ice), liquid, and gas (evaporated water). When you heat a block of ice it will melt and become a liquid. When you heat the liquid it turns into a vapor which can be observed as steam.


When matter is compressed, its temperature increases. Conversely, when pressure is released from matter, the temperature of the matter decreases. This can be observed with an aerosol spray can. After expelling the matter from the container, which reduces the pressure of the contents of the container, the temperature of the container is decreased.


Glutown320x480.pngRefrigerant is a colorless compound that is used in air conditioning refrigerating and refrigeration systems for its unique temperal properties. The most common type used is R-134a. In the past R-12 and R-22 were common, but their use was discontinued when it was discovered that, when released into the atmosphere, they had an adverse effect on the environment. Refrigerant changes from a gas to liquid and back again many times throughout the basic refrigerant cycle. Refrigerant is naturally very cold. In fact, its boiling point is only -26.08°C, or -14.94°F! (At atmospheric pressure, commonly 101,4 kPa. )This property makes it ideal for use in refrigeration. Its ability to maintain low temperatures in a liquid state allows it to absorb a large amount of heat from the around it. You should never handle refrigerant, it can be very dangerous if you are not trained to use it. When refrigerant comes into contact with a flame it can break down into gases that can be harmful if they are inhaled.

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