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Camping Freezers – How Absorption Cooling Works

Absorption cooling is a method used in some fridges and freezers, particularly for camping, caravans, and RVs, where electricity may not be reliably available. Unlike conventional compressor fridges, absorption fridges use heat as the energy source rather than an electrically powered compressor.

An absorption refrigerator or freezer uses a heat source—such as:

  • Solar energy
  • A gas flame (propane or LP gas)
  • Waste heat from industrial processes

…to drive the cooling cycle. Because the system has no moving parts apart from the refrigerant itself, it is quiet, highly reliable, and ideal for mobile applications.

Both absorption and compressor refrigerators rely on a refrigerant with a very low boiling point (typically below 0 °F / −18 °C). The refrigerant absorbs heat when it evaporates, providing the cooling effect.

The key difference is how the refrigerant is returned to its liquid state to continue the cycle:

  • Compressor fridges: Use an electrically powered compressor to increase pressure, forcing condensation.
  • Absorption fridges: Use heat to drive the condensation process—no compressor is needed.
  1. Evaporation
    • A liquid refrigerant evaporates in a low-pressure environment.
    • This evaporation absorbs heat from the fridge or freezer compartment, cooling its contents.
  2. Absorption
    • The gaseous refrigerant is absorbed into another liquid, often a salt solution or water/ammonia mixture.
  3. Regeneration
    • The refrigerant-saturated liquid is heated, causing the refrigerant to evaporate.
    • The hot gaseous refrigerant passes through a heat exchanger, transferring heat to the outside environment.
    • The refrigerant condenses back into a liquid, ready to restart the cycle.
  1. Compressor refrigerators:
    • Use an electric compressor to increase gas pressure.
    • Hot, high-pressure refrigerant is condensed in a heat exchanger and then passed through a throttle valve into the evaporator.
    • Evaporation in the low-pressure evaporator absorbs heat, cooling the compartment.
    • Typically use HCFC or HFC refrigerants.
  2. Absorption refrigerators:
    • Use heat to drive the cycle; no moving compressor.
    • Typically use ammonia or water as refrigerants.
    • Ideal for off-grid environments and situations where quiet, vibration-free operation is preferred.
  3.  
  4.  
  • Works on gas, solar, or electricity, giving flexibility for off-grid adventures
  • Silent operation—no compressor noise
  • Very durable with minimal maintenance
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