Refrigerators work by causing the refrigerant circulating inside them to change from a liquid into a gas. This process, called evaporation, cools the surrounding area and produces the desired effect. You can test this process for yourself by taking some alcohol and putting a drop or two on your skin.
How does refrigeration work?
Page Contents
Youtube quote: The basic principle of refrigerators is simple simply pass a colder liquid continuously around the object to be cooled.
What are the 4 process of refrigeration?
The 4 Main Refrigeration Cycle Components
The compressor.
The condenser.
The expansion device.
The evaporator.
How industrial refrigeration systems work?
Youtube quote: These refrigeration systems usually consist of two or more separate refrigeration circuits often using different refrigerants to provide a cooling effect.
How cold is refrigerant?
between 40° and 50
As its name implies, refrigerant in the evaporator “evaporates”. Upon entering the evaporator, the liquid refrigerant’s temperature is between 40° and 50°F; and without changing its temperature; it absorbs heat as it changes state from a liquid to a vapor.
How does a compressor work in a refrigeration system?
The Refrigeration Cycle
The compressor receives low pressure gas from the evaporator and converts it to high pressure gas through compression, as the name states. As the gas is compressed, the temperature rises. The hot refrigerant gas then flows to the condenser.
Which cycle is used in refrigeration?
vapor-compression refrigeration
The vapor-compression refrigeration is the most widely used cycle for refrigerators, air- conditioners, and heat pumps.
What is evaporator in refrigeration system?
Evaporator. An evaporator is used to turn any liquid material into gas. In this process, heat is absorbed. The evaporator transfers heat from the refrigerated space into a heat pump through a liquid refrigerant, which boils in the evaporator at a low-pressure.
Which cycle is used in air refrigeration system?
Air cycle refrigeration works on the reverse Brayton or Joule cycle. Air is compressed and then heat removed, this air is then expanded to a lower temperature than before it was compressed.
What is refrigerant made of?
In addition to fluorine and carbon, Freons often contain hydrogen, chlorine, or bromine. Thus, Freons are types of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and related compounds.
How does refrigerant absorb heat?
When the liquid refrigerant reaches the evaporator its pressure has been reduced, dissipating its heat content and making it much cooler than the fan air flowing around it. This causes the refrigerant to absorb heat from the warm air and reach its low boiling point rapidly.
What will happen to the refrigerant liquid?
If liquid refrigerant has to rise from the condenser or receiver to an expansion valve at a higher level, there will be a loss of static head, and the refrigerant may reach its boiling point and start to flash off. Under such circumstances, bubbles will show in.
In what state does refrigerant leave the condenser?
liquid
The refrigerant leaves the condenser as a regular temperature, saturated high pressure liquid.
Why does the refrigerant pressure decrease?
Why does refrigerant pressure decrease in a refrigerant cylinder while charging with vapor. When refrigerant is added in the vapor state, the refrigerant cylinder will lose pressure as the vapor is pushed out of the cylinder.
What happens if liquid refrigerant enters the compressor?
If liquid refrigerant is entering the compressor, liquid will fall directly into the crankcase oil and eventually be flashed. As mentioned earlier, this is referred to as flooding. This causes oil foaming and excessively high crankcase pressures.
What causes foamy refrigerant?
In general, foaming occurs when the oil-refrigerant mixture is exposed to a sudden pressure drop, as is the case in starting up a reciprocating compressor 1. The foaming oil may be sucked into a cylinder, which causes liquid compression and valve failure.
What does foamy refrigerant mean?
Oil Foaming
When the compressor starts, the pressure of the refrigerant-oil mixture in the crankcase drops suddenly. As a lower amount of liquid refrigerant is required to saturate the oil, the rest of the refrigerant will expand and evaporate into vapor.
