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Freeze Protection Closed Loop Systems

Antifreeze is used to freeze protect water based heat transfer fluids or brines

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Various types and concentration of antifreeze like

  • ethanol
  • methanol
  • propylene glycol
  • ethylene glycol

can be used to freeze protect brines where the temperature in the fluids are below 0oC (32oF). Typical advantages and disadvantages for the freeze protection fluids are listed below:

Ethanol

  • low corrosiveness
  • high flammability if pure
  • low toxicity
  • high heat transfer capacity
  • low viscosity
  • moderate cost

Methanol

  • low corrosiveness
  • high flammability if pure
  • high toxicity
  • high heat transfer capacity
  • low viscosity
  • low cost

Propylene Glycol

  • low corrosiveness
  • low flammability
  • low toxicity
  • high heat transfer capacity
  • higher viscosity
  • high cost

Ethylene Glycol

  • low corrosiveness
  • low flammability
  • high toxicity
  • lower heat transfer capacity
  • higher viscosity
  • high cost

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Related Topics

  • Air Conditioning - Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort

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