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What kinds of refrigerants are often used in refrigerators  

Update:22-12-2021
Summary:

   When we use the freezer, we will never ignore its re […]

   When we use the freezer, we will never ignore its refrigerant, but there are many types of refrigerant, and you can choose the appropriate type when you use it. But what are the advantages and disadvantages of different refrigerants during operation? The following is a detailed analysis of this issue, I hope everyone can take a look.
The refrigerator is a kind of cooling equipment that can provide constant temperature, constant flow, and constant pressure. Its working principle is that the refrigerant is first cooled at the evaporator to obtain cold energy, and then it is pumped to various places where cold energy is needed. After absorbing the heat, it returns to the evaporator to be cooled again, and so on, so as to achieve the purpose of continuous cooling. So, what are the commonly used refrigerants on board refrigerators? What are the advantages and disadvantages?
water
  Advantages: It has high specific heat, low density, low corrosiveness to refrigerators and pipelines, non-combustible, non-explosive, non-toxic, good chemical stability, cheap and easy to obtain.
   Disadvantages: The freezing point is high, and it can only be used in refrigeration systems above 0°C.
  Application range: suitable for occasions where the refrigeration temperature is above 0℃.
   salt water
   Advantages: It is supported by salt soluble in water, which can lower the freezing point temperature and increase the cooling range. Commonly used brines as refrigerants include sodium chloride aqueous solution and calcium chloride aqueous solution, which are suitable for medium and low temperature refrigeration systems.
   Disadvantages: Corrosive to the refrigerator and pipes.
  Application range: It can be used in salt water ice maker and indirect cooling refrigeration equipment, or to cool bagged food.
   Ethylene Glycol and Propylene Glycol
  Advantages: low freezing point, stable properties, miscible with water, wide use temperature range, low price, and large heat capacity.
   Disadvantages: The viscosity of the solution rises very rapidly at low temperatures and is corrosive.
  Application range: usually their aqueous solution is used as the refrigerant, and the applicable temperature range is 0~-50℃.
   Dichloromethane and Trichloroethylene
  Advantages: They usually use their liquid as a refrigerant, with a low freezing point.
   Disadvantages: high volatility, low boiling point, large loss, and corrosive.
  Application range: usually use their liquid as the refrigerant, the applicable temperature range is -50~-100℃.

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