How Air Conditioners Work and energy conservation technology research Abstract：  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. Keywords：  water towers 、weather-resistant、  compressor、energy conservation When  the  temperature outside begins  to climb, many people seek  the cool  comfort of  indoor air conditioning. Like water towers and power lines, air conditioners are one of those things that we see  every  day  but  seldom  pay  much  attention  to.  Wouldn't  it  be  nice  to  know  how  these indispensable machines work their magic? In this article, we will examine air conditioners – from small to huge -- so you know more about what you're seeing! 34144
The Many Faces of Cool Air conditioners come in various sizes, cooling capacities and prices. One type that we see all the time is the window air conditioner. Window air conditioners are an easy and economical way to cool a small area. Most people who live in suburban areas usually have one of these in their backyard: If you live in an apartment complex, this is probably a familiar sight: Most businesses and office buildings  have  condensing  units  on  their  roofs,  and  as  you  fly  into  any  airport  you  notice  that warehouses and malls may have 10 or 20 condensing units hidden on their roofs: And  then  if  you  go  around back  at many  hospitals,  universities  and  office  complexes,  you  find large cooling towers that are connected to the air conditioning system: Even  though  each  of  these  machines  has  a  pretty  distinct  look,  they  all  work  on  the  same principles. Let's take a closer look. The Basic Idea 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.  According  to  the Merriam-Webster  Dictionary Online,  the  term  Freon  is  generically  "used  for  any  of  various  conditioner.  According  to  the Merriam-Webster  Dictionary  Online,  the  term  Freon  is  generically  "used  for  any  of  various nonflammable fluorocarbons used as refrigerants and as propellants for aerosols." This  is how  the  evaporation cycle  in an air conditioner works  (See How Refrigerators Work  for complete details on this cycle): 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 a light weight oil. This oil lubricates the compressor. Window Units A window air conditioner unit implements a complete air conditioner in a small space. The units are made small enough  to  fit  into a standard window  frame. You close  the window down on  the unit,  plug  the  unit  in  and  turn  it  on  to  get  cool  air.  If  you  take  the  cover  off  of  an  unplugged window unit, you will find that it contains: A compressor An expansion valve A hot coil (on the outside) A chilled coil (on the inside) A control unit The  fans blow air over the coils to improve their ability  to dissipate heat (to the outside air) and cold (to the room being cooled). BTU and EER Most air conditioners have their capacity rated in British thermal units (BTU). Generally speaking, a BTU is the amount of heat required to raise the temperature of one pound (0.45 kg) of water 1 degree Fahrenheit (0.56 degrees Celsius). Specifically, 1 BTU equals 1,055 joules. In heating and cooling terms, 1 "ton" equals 12,000 BTU. A  typical  window  air  conditioner  might  be  rated  at  10,000  BTU.  For  comparison,  a  typical 2,000-square-foot  (185.8 m2)  house might  have  a  5-ton  (60,000-BTU)  air  conditioning  system, implying that you might need perhaps 30 BTU per square foot. (Keep in mind that these are rough estimates. To size an air conditioner for your specific needs, contact an HVAC contractor.) The  energy efficiency  rating  (EER) of an air conditioner  is  its BTU  rating over  its wattage. For example,  if  a  10,000-BTU  air  conditioner  consumes  1,200  watts,  its  EER  is  8.3  (10,000 BTU/1,200 watts). Obviously, you would  like  the EER  to be as high as possible, but normally a higher EER is accompanied by a higher price. Is the higher EER is worth it? Let's  say  that  you  have  a  choice  between  two  10,000-BTU  units. One  has  an  EER  of  8.3  and consumes 1,200 watts, and the other has an EER of 10 and consumes 1,000 watts. Let's also say that the price difference is $100. To understand what the payback period is on the more expensive unit, you need to know: 空调节能技术英文文献和中文翻译:http://www.youerw.com/fanyi/lunwen_31576.html