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Line 34: − + − − ===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" − [http://www.brighthubengineering.com/hvac/20355-methods-of-refrigeration-vapor-absorption-cycle]
→Cyclic refrigeration: saving more progress
==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.
===Vapor-compression cycle===
===Vapor absorption cycle===
The first cyclic refrigeration system used the vapor absorption cycle. It has become much less common, since it is less effective than the modern vapor compression (it has a low coefficient of performance). This vapor absorption cycle does not use very much electricity compared to other methods, but does require plenty of heat.
**How it works**
Although less efficient than modern options, vapor absorption still has its uses. It is very common in mobile homes and recreational vehicles, where propane or natural gas is readily available, but battery power is limited.
*''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"
[http://www.brighthubengineering.com/hvac/20355-methods-of-refrigeration-vapor-absorption-cycle]''
===Vapor compression cycle===
[[File:Refrigeration - Single stage vapor compression.png|thumbnail|300px|A single-stage vapor compression refrigeration system]]
[[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, which uses the reverse Brayton cycle,<ref>http://www.brighthubengineering.com/hvac/20590-comparison-of-vapor-compression-cycle-and-gas-cycle</ref> is employed by household refrigerators, home air conditioners, automobile air conditioners, and other coolant devices. It is the most efficient refrigeration cycle currently available.
The most common kind of refrigeration uses the vapor compression cycle. This method, which uses the reverse Brayton cycle,<ref>http://www.brighthubengineering.com/hvac/20590-comparison-of-vapor-compression-cycle-and-gas-cycle</ref> is employed by household refrigerators, home air conditioners, automobile air conditioners, and other coolant devices. It is the most efficient refrigeration cycle currently available.
#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.
===Gas cycle===
===Gas cycle===
Gas cycle systems are similar to vapor-compression cycle systems, but use the reverse Rankine cycle. The main functional difference from vapor-compression is that the refrigerant remains a gas throughout the entire process. For this reason, a specially formulated refrigerant is not usually needed. Regular [[nitrogen]]-dominant air is usually sufficient. However, this system is also less efficient than vapor-compression, and also much larger.<br />
Gas cycle systems are similar to vapor compression cycle systems, but use the reverse Rankine cycle. The main functional difference from vapor compression is that the refrigerant remains a gas throughout the entire process. For this reason, a specially formulated refrigerant is not usually needed. Regular [[nitrogen]]-dominant air is usually sufficient. However, this system is also less efficient than vapor compression, and also much larger.<br />
Gas cycle refrigeration is used in some cases where high-pressure air is readily available, or chemical refrigerants (like ammonia) are considered too dangerous. One place this system is popular in aircraft, since both of these criteria are met.<ref>http://www.brighthubengineering.com/hvac/20589-methods-of-refrigeration-gas-cycle</ref>
Gas cycle refrigeration is used in some cases where high-pressure air is readily available, or chemical refrigerants (like ammonia) are considered too dangerous. One place this system is popular in aircraft, since both of these criteria are met.<ref>http://www.brighthubengineering.com/hvac/20589-methods-of-refrigeration-gas-cycle</ref>
==Dehumidifiers==
==Dehumidifiers==