Refrigerant

The task of the refrigerant is to transfer energy from one level and dispose of it at a higher level. There are many different types of primary refrigerants, each with technical substance characteristics, such as pressure, temperature, heat content, specific volume, and entropy for every need.

There are many different types of primary refrigerants, each with technical substance characteristics, such as pressure, temperature, heat content, specific volume, and entropy for every need.
The use of the different types of refrigerants depends on the size of the systems, but also the production year. In recent years, awareness of the strain on the environment has caused a shift in the use of different refrigerants. As a result the natural refrigerants are becoming increasingly more popular.

The task of the refrigerant is to transfer energy from one level and dispose of it at a higher level. The cyclic process of the refrigerant can be illustrated in a (h) LogP based on the following conditions:

  • The refrigerant is kept under pressure at surrounding temperature as undercooled liquid 
  • The refrigerant is expanded to a lower pressure at the point of saturation 
  • The heat influence from the media or matter to be cooled causes the refrigerant to boil at the low pressure in the evaporator 
  • Once the refrigerant is evaporated into dry, saturated vapour, it is compressed in the compressor to a higher pressure as overheated vapour 
  • In the condenser the vapour is condensed under the high pressure by exchanging the energy with e.g. air at a lower temperature than the saturation temperature

Typical types of refrigerants:

  • Synthetic refrigerants type CFC, HCFC, and HFC influence the greenhouse effect For example R134a, R404A, R407C, R410A, R507A 
  • Natural refrigerants: R717 (ammonia) R290 (propane), R600a (isobutane), R744 (carbon dioxide)




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