HOT!!!!

Recently the weather was soooo hot!!!If can stay at the air-conditioned room is the best!!


How air conditioner works?
Most people think that air conditioners lower the temperature in their homes simply by pumping cool air in. What's really happening is the warm air from your house is being removed and cycled back in as cooler air. This cycle continues until your thermostat reaches the desired temperature.

An air conditioner is basically a refrigerator without the insulated box. It uses the evaporation of a refrigerant, like Freon, to provide cooling. The mechanics of the Freon evaporation cycle are the same in a refrigerator as in an air conditioner.
Freon is DuPont's trade name for its odorless, colorless, nonflammable, and noncorrosive chlorofluorocarbon and hydrochlorofluorocarbon refrigerants.

A simple stylized diagram of the refrigeration cycle: 1.condensing coil 2. expansion valve 3. evaporator coil 4. compressor

1.The compressor compresses cool Freon gas, causing it to become hot, high-pressure Freon gas (red in the diagram above).

2.This hot gas runs through a set of coils so it can dissipate its heat, and it condenses into a liquid.

3.The Freon liquid runs through an expansion valve, and in the process it evaporates to become cold, low-pressure Freon gas (light blue in the diagram above).

4.This cold gas runs through a set of coils that allow the gas to absorb heat and cool down the air inside the building.
Mixed in with the Freon is a small amount of lightweight oil. This oil lubricates the compressor.

Air conditioners help clean your home's air as well. Most indoor units have filters that catch dust, pollen, mold spores and other allergens as well as smoke and everyday dirt found in the air. Most air conditioners also function as dehumidifiers. They take excess water from the air and use it to help cool the unit before getting rid of the water through a hose to the outside. Other units use the condensed moisture to improve efficiency by routing the cooled water back into the system to be reused.

Type of air conditioning
Refrigeration cycle
In the refrigeration cycle, a heat pump pumps heat from a lower temperature heat source into a higher temperature heat sink. Heat would naturally flow in the opposite direction. This is the most common type of air conditioning. A refrigerator works in much the same way, as it pumps the heat out of the interior into the room in which it stands.

Refrigerants
"Freon" is a trade name for a family of chlorofluorocarbon (CFC) refrigerants manufactured by DuPont and other companies. These refrigerants were commonly used due to their superior stability and safety properties. Unfortunately, evidence has accumulated that these chlorine bearing refrigerants reach the upper atmosphere when they escape. The chemistry is poorly understood but general consensus seems to be that CFCs break up in the stratosphere due to UV-radiation, releasing their chlorine atoms. These chlorine atoms act as catalysts in the breakdown of ozone, which does severe damage to the ozone layer that shields the Earth's surface from the strong UV radiation. The chlorine will remain active as a catalyst until and unless it binds with another particle forming a stable molecule.

FREON
Freon is not exact a chemical. It is actually a trade name that describes a whole class of chemicals used in refrigeration. Most of the chemicals included under the trade name of Freon are known as chlorofluorocarbons(CFCs). This means that their chemical structure is made up of the main chemical building blocks of carbon and hydrogen, but they also include chlorine and fluorine as well.

The most serious side effect of freon exposure would occur at the time of initial exposure. People who have a history of heart problems should be very concerned about Freon because it can cause cardiac arrhythmia (irregular heartbeat), and palpitations at very high concentrations. For people who have a history of heart problems, being exposed to small amounts of Freon from leaking appliances should not pose any significant health risk.

Fortunately, Freon does not have serious long term health consequences. It is not a carcinogen, teratogen, or mutagen, and it does not damage the liver. When it is inhaled, it is rapidly excreted by exhalation, and it is not significantly accumulated in the body. This means that breathing low concentrations of freon from a leaking refrigerator or air conditioner over a long period of time is unlikely to have a cumulative effect, and thus few, if any, long term health effects.

If you discover that you have a Freon leak, contact a technician for repairs immediately. Open up windows and doors and use fans to help move the air out of the area. Remove yourself and your pets to an area of fresh air, and if you feel any unusual health effects, seek medical care. If you have chronic heart conditions, consider having your Freon containing appliances checked regularly for leaks.

Air conditioner equipments
There are few equipments to combine and makes up the air conditioner system:
1.Window and through-wall units
2.Evaporative coolers
3.Central air conditioning