TL;DR
[Greenhill Forge] has developed an innovative off-grid refrigeration system that utilizes just fire and salt, minimizing reliance on electricity. This approach leverages a technology called absorption cooling, where water acts as the refrigerant. The system works by boiling this saltwater solution at low pressure, allowing it to absorb heat from the environment as it changes from liquid to vapor. The vapor is then condensed back into liquid in a separate section, releasing the absorbed heat.