2.  Air conditioning Category: 1. Refrigeration cycle 2. Heat pump 3. Evaporative cooling  Refrigerants  Air conditioning system configurations  Refrigeration system configurations

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

4.  A heat pump is an air conditioner in which the refrigeration cycle can be reversed.  In heating mode, the indoor evaporator coil becomes the condenser coil and producing heat.  The outdoor condenser unit also switch to the evaporator, and discharges cold air.

5.  Some of the sensible heat of the entering air is converted to latent heat by the evaporation of water in the wet cooler pads.

6.  These coolers cost less and are mechanically simple to understand and maintain.

7.  Be noncorrosive to mechanical components, and be safe, including free from toxicity and flammability. It would not cause ozone depletion or climate change.  High heat of vaporization, a moderate density in liquid form, a relatively high density in gaseous form, and a high critical temperature.

8.  The interior air is cooled as a fan blows it over the evaporator.  On the exterior the heat drawn from the interior is dissipated into the environment as a second fan blows outside air over the condenser.

10.  Split-system air conditioners come in two forms: mini-split and central systems. In both types, the inside-environment (evaporative) heat exchanger is separated by some distance from the outside-environment (condensing unit) heat exchanger.

13.  Modern scientific and technological progress, Each household electrical appliances have lost their advantages and disadvantages, We should choose the type that best meet usage requirements

14.  http://en.wikipedia.org/wiki/Air_conditioning http://en.wikipedia.org/wiki/Air_conditioning  https://www.ptt.cc/man/Interior/DC61/M.1209442147.A.EDC.ht ml  http://en.wikipedia.org/wiki/Refrigerator http://en.wikipedia.org/wiki/Refrigerator  http://thomas1972.pixnet.net/blog/post/30644844- %E5%86%B7%E6%B0%A3%E7%94%A8%E5%86%B7%E5 %AA%92r22%E8%88%87%E7%92%B0%E4%BF%9D%E5% 86%B7%E5%AA%92r410a%E7%9A%84%E5%B7%AE%E7 %95%B0%E5%8F%8A%E6%B3%95%E4%BB%A4%E8%A6 %8F