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by jaclaz 703 days ago
Absorption refrigerator: https://en.wikipedia.org/wiki/Absorption_refrigerator

Einstein refrigerator: https://en.wikipedia.org/wiki/Einstein_refrigerator

The principle is still used in some refrigerating devices (typically hotel mini fridges and similar small units for RV's) as there is no need of a compressor (i.e. the device is completely silent) and also in some HVAC machines.