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==Cyclic refrigeration==
==Cyclic refrigeration==
Cyclic refrigeration is a two-way progress which uses the properties of a liquid/gas to force heat from one space into another. This process requires a refrigerant, which is moved through the system to transport heat.
Cyclic refrigeration is a two-way progress which uses the properties of a liquid/gas to force heat from one space into another. This process requires a refrigerant, which is moved through the system to transport heat.<br />
===Vapor-compression cycle===
[[File:Refrigeration - Single stage vapor compression.png|thumbnail|300px|A single-stage vapor compression refrigeration system]]
The most common kind of refrigeration uses the Vapor-compression cycle. This method is employed by household refrigerators, home air conditioners, automobile air conditioners, and some other coolant devices.
#To begin, gaseous refrigerant is compressed (by the compressor) and pushed into the condenser. The refrigerant becomes a liquid in the condenser, which is fairly hot. Heat is removed from the refrigerant by some kind of heat sync, usually a radiator with a fan pushing air across it, but other systems can be used, including fluid cooled systems.
#To begin, gaseous refrigerant is compressed (by the compressor) and pushed into the condenser. The refrigerant becomes a liquid in the condenser, which is fairly hot. Heat is removed from the refrigerant by some kind of heat sync, usually a radiator with a fan pushing air across it, but other systems can be used, including fluid cooled systems.
#Next, the cooled liquid is passed to an expansion valve, which reduces the pressure on the refrigerant and allows it space to convert back to a gas.
#Next, the cooled liquid is passed to an expansion valve, which reduces the pressure on the refrigerant and allows it space to convert back to a gas.
The simple science behind this entire system is that for a gas to become a liquid, more energy is required. As heat is taken from its surroundings, something placed nearby can be cooled.<br />
The simple science behind this entire system is that for a gas to become a liquid, more energy is required. As heat is taken from its surroundings, something placed nearby can be cooled.<br />
Conversely, when a gas becomes a liquid, heat must be released. (Atoms and molecules need more energy to move freely as a gas than stay as a liquid.) For refrigerant to be useful over and over, it must be converted back into a liquid. This is performed on the "hot" side of the system, so that the liquid can again be pumped to the "cold" side and decompressed.
Conversely, when a gas becomes a liquid, heat must be released. (Atoms and molecules need more energy to move freely as a gas than stay as a liquid.) For refrigerant to be useful over and over, it must be converted back into a liquid. This is performed on the "hot" side of the system, so that the liquid can again be pumped to the "cold" side and decompressed.
===Vapor absorption cycle===
*''low coefficient of performance''
*"the compressor is replaced by an absorber which dissolves the refrigerant in a suitable liquid, a liquid pump which raises the pressure and a generator which, on heat addition, drives off the refrigerant vapor from the high-pressure liquid"
===Gas cycle===
Does not change states of matter ****
==Dehumidifiers==
****
==References==
==References==
{{reflist}}
{{reflist}}