A simple stylized diagram of the refrigeration cycle: 1) condensing coil, 2) expansion valve, 3) evaporator coil, 4) compressor.The external section of a typical single-room air conditioning unit.  For ease of installation, these are frequently placed in a window.  This one was installed through a hole cut in the wall.
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Air Conditioners

An air conditioner is an appliance, system, or mechanism designed to extract heat from an area using a refrigeration cycle. In construction, a complete system of heating, ventilation, and air conditioning is referred to as HVAC. more...

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Its purpose, in the home or in the car, is to provide comfort during hot days and nights.

History

See Air conditioning#History.

Air conditioning applications

See Air conditioning#Air conditioning applications.

Air conditioning system basics and theories

Refrigeration cycle

In the refrigeration cycle, a heat pump transfers 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.

This cycle takes advantage of the universal gas law PV = nRT, where P is pressure, V is volume, R is the universal gas constant, T is temperature, and n is the number of moles of gas (1 mole = 6.022Ă—1023 molecules).

The most common refrigeration cycle uses an electric motor to drive a compressor. In an automobile the compressor is driven by a pulley on the engine's crankshaft, with both using electric motors for air circulation. Since evaporation occurs when heat is absorbed, and condensation occurs when heat is released, air conditioners are designed to use a compressor to cause pressure changes between two compartments, and actively pump a refrigerant around. A refrigerant is pumped into the cooled compartment (the evaporator coil), where the low pressure and low temperature cause the refrigerant to evaporate into a vapor, taking heat with it. In the other compartment (the condenser), the refrigerant vapour is compressed and forced through another heat exchange coil, condensing into a liquid, rejecting the heat previously absorbed from the cooled space.

Humidity

Refrigeration air conditioning equipment usually reduces the humidity of the air processed by the system. The relatively cold (below the dewpoint) evaporator coil condenses water vapor from the processed air, (much like an ice cold drink will condense water on the outside of a glass), sending the water to a drain and removing water vapor from the cooled space and lowering the relative humidity. Since humans perspire to provide natural cooling by the evaporation of perspiration from the skin, drier air (up to a point) improves the comfort provided. The comfort air conditioner is designed to create a 40% to 60% relative humidity in the occupied space. In food retailing establishments large open chiller cabinets act as highly effective air dehumidifying units.

Read more at Wikipedia.org


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Bryant 4 Ton 13 Seer Complete System with Electric Heat $2,099.00 New 2008 10000 Btu Portable Room Air Conditioner Heater $309.00
Qty 40 Aircon 24,000 btu ductless mini split Heat Pumps $34,000.00 Brand New 2008 Portable Air Cool Conditioner Cooler Fan $179.90
NewAir Ac-1400E 14,000 Btu Portable Air Conditioner $449.10 $400 Off Central Air Conditioner room portable window $7.81
Air Conditioner Ac Infrared Ir Remote Control Rc Mini $3.99 Haier Cprb07Xc7-B Portable Air Conditioner 7,000 115Vt $249.97
New Portable Air Swamp Cooler Humidifier Conditioner $74.99 Frigidaire Fah126R2T 12,000-Btu Through-the-Wall Ac $329.99
Window Less 4-in-1 Air Cooler,Humidifier, Purifier,Fan $119.00 New Mobile Home System w/ Condenser, Gas Furnace & Coil $1,720.00
New Gas Furnace A-Coil $799.00 New Complete System Condensing Unit Gas Furnace A-Coil $1,436.00
Window A/C Compressor W/Cap For 18,000 Btu'S $5.00 Large Haier Indoor Room Portable Air Conditioner Ac $350.00
Mini Split Wall Mount Bracket $49.95 Desktop Portable Air Conditioner Cooler Fan Ice New $26.99
Sunpentown Evaporative Air Cooler Conditioner Spt Sf609 $89.95 New Goodman A/C Vertical Coil Model Capf4860D6Ba $99.95
Bryant Heat Pump Air Conditioner $950.00 New 12000 Btu Portable Air Conditioner Dehumidifier Fan $9.99
New Kool Down Air Cooler And Humidifier Air Conditioner $9.99 White Kenmore 5150 Btu Room Air Conditioner 75050 $9.99
New Mini Universal Remote Control Air Conditioner Ac $4.00 Emerson Quiet Cool Air Conditioner 8K Btu Brrrrr! $24.95
Portable Airconditioner. 10,000 B.T.U. New! w/ Remote!! $249.00 York Complete 1 - Ton Split System Air Conditioning Ac $100.00
Bryant 2 Ton 13 Seer Package Unit New 15 Kw Heat $1,699.00 Swamp Air Cooler Ice Cool Air Fan Ionizer, Conditioner+ $79.95
Port-A-Cool Swamp Cooler Pac2K363Sp $500.00 Brand New--Great Quality-- Cheap Evaporator Coils $165.00
Rv Camper Motor Home Foam Ac Air Conditioner Filter $3.99 Kenmore model 42-75051 window air conditioner 5,300 Btu $29.99
MasterCool Mmb12A Swamp Cooler $50.00 Movincool Classic 10 Air Conditioner Movin Cool $400.00
Portable Air Swamp Cooler Humidifier Conditioner New $69.99 Air Conditioning central unit Trane Xl 1200 $1,200.00
portable Air Conditioner desk fan 02 O2 Cool Box Ac/Dc $69.99 New Frigidaire 8,000 Btu Window Room Air Conditioner $200.00
New DeLonghi 10,000 Btu Portable Air Conditioner $500.00 Samsung Aw08Ecb8 8000 Btu Air Conditioner $49.99
Trane Xr13 Air Conditioner Condenser Condenser $499.99 Sunpentown Wa-1230E 12000 Btu Portable Air Conditioner $478.89
5 Ton Package Ac Unit $750.00 Lg Window Unit Air Conditioner Lb8000R New In Box $99.00
1.5 Ton Trane Heatpump $10.00 Portable Air Gently used 8000btu's by Everstar $100.00
York 3.5 ton Ac outdoor condensing unit air conditionin $99.00 New Lennox Air Conditioner Packaged Cooling 5 Ton Hvac $350.00
Sharp Cv-P12Lx Portable Air Conditioner 11,500 Btu $549.00 Air Conditioner A/C Adapter R410A, Mini-Split Systems $7.95
Port-A-Cool Evaporative Cooler Model Pac2K36Hpvs $99.00 Frigidaire (Fap094P1Z) Portable Air Conditioner $50.00
A/C Training Items-----Books-----Elect rical Wireing $8.75 Plasma Cool Portable Air Conditioner by Arbaco $669.99
$400 Off Central Air Conditioner portable window room $7.90 Friedrich Wall Air Conditioner; 14,500 Btu- Free S&H.. $400.00
Window Air Conditioner 160 Lb. Mounting Bracket Kit New $39.95 Artic stat evaporative cooler remote control new in box $11.99
Hampton Bay 5050Btu air conditioner $20.00 Hampton Bay 8000Btu air conditioner with remote control $25.00
New Maytag M6X06F2F 6000Btu Window Room Air Conditioner $163.00 New Maytag M6Y12F2D 12000Btu Window Room Airconditioner $218.00
New Mobile Home System Condenser Elect Furnace & Coil $1,563.00 Spt Portable Air Conditioner 9000Btu $76.00
Sanyo Rh D75E Air treatment Center Clean Air $9.99 NewAir Acp-1300H Portable Air Conditioner with Heater $432.95
Haier Hprd12Xh5 12,000 Btu Portable Air Conditioner Ac $300.00 Soleus Air Sa-50 Multi Filter Hepa Air Purifier Ionizer $69.00
Kenmore 75121 Thru- Wall or Window Air Conditioner.New. $199.00 Goodman 4.0 Ton 14 Seer Central Ac A/C Conditioner $1,763.00
Payne Air Conditioner Compressor $199.00 Goodman 5.0 Ton 14 Seer Central Ducted Ac Conditioner $1,974.00
Frigidaire Air Conditioner $80.00 Friedrich Quietmaster Model Kl25J30A Pick up, Li Ny $99.00
Hampton Bay 8,000 Btu Window Air Conditioner $40.00 Portable Ac $200.00
Large 6-Ton Daikin Heat Pump / Ac Unit Vrvii Rxyq72Mtju $3,500.00 New Amcor 14,000 Btu Portable Air Conditioner & Heater $489.00
Remanufactured 13000 Btu Portable Room Air Conditioner $359.00 Portable Air Swamp Cooler Conditioner Humidifier New $59.99
New 14,000 Btu Portable Room Air Conditioner & Heater $499.00 1/6hp Condenser Fan Motor Universal Fit Diversitech $54.95
Haier Esa3125 12,000 Btu Window Air Conditioner $249.99 Parker A/C Line Drier 1/4" Flare $2.50
New 13 Seer Air Conditioner Condensing Unit $637.00 Dc Inverter Ductless Mini Split Air Conditioner Ac Heat $849.00
Wall Bracket For Ductless Mini Split Air Conditioner Ac $99.00 New Goodman® 5 ton 13 Seer Packaged Air Conditioner $1,999.00
Portable Air Conditioner Amcor 9,000 Btu w/ NanoMist $359.99 One Ton Mini Split Air Conditioner Heatpump Dc Inverter $799.99
R-22, R22 A/C & Heat Pump Refrigerant 15oz. can $17.99 R22 Refrigerant R-22"Stop-Leak Repair-Recharge Kit"-C2 $79.95
Heating & Air 10 x 4 Wall and Ceiling Registers 10 New $49.99 Haier Hprd12Xh5 Portable Air Conditioner - Heat 115Volt $469.97
Haier Hprb07Xc7 Portable Air Conditioner Silver 115Volt $249.97 Soleus Air Portable Air Conditioner w/Heat Pump $799.00
Soleus Air 12,000 Btu Portable Ac with Heat Pump $639.00 Soleus Air 9,000 Btu Portable Evaporative Ac $478.00
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Prices current as of last update, 07/06/08 1:25am.


See also...
Central Air Conditioners, Air Conditioners, Heating, Cooling & Air
Other Air Conditioners, Air Conditioners, Heating, Cooling & Air
Portable Air Conditioners, Air Conditioners, Heating, Cooling & Air
Window Air Conditioners, Air Conditioners, Heating, Cooling & Air

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