For anyone who has only recently heard of them, refrigerators that run on Propane have been around for quite a long period of time.
For example Electrolux have been producing refrigerators powered by Propane since 1925.
This same model known as the 'Servel' is still in production up to this day.
While this technology has been available and in production since 1925 it should be noted many improvements have been made in this time and as a result the efficiency of this type of refrigeration has increased significantly along with increased safety considerations.
What exactly is a Propane Refrigerator? A propane refrigerator has a few major differences to that of a standard refrigerator.
The major point of difference is rather obvious by the name.
These refrigerators use propane gas to operate.
Apart from this they function in a similar way to that of a standard refrigerator.
It should be noted that because they are powered by propane they do not have any moving parts.
They do however require specialist components that all play a role in the refrigeration process.
The components that make up this type of refrigerator include the:

• Generator
• Condenser
• Evaporator
• Separator
• Absorber

How do they Cool? As a very broad overview, a propane refrigerator requires a propane burner that in turn heats the generator.
Once the generator is sufficiently heated it will in turn cause the Ammonia and water mixture to heat up, and eventually boil.
This heated liquid travels through pipes to the separator unit.
As both Ammonia and water have a different weight they are easily separated and the Ammonia is cooled via the condenser and converted to a liquid form.
The water is preserved to continue the process.
Once the Ammonia is in a liquid form it is mixed with Compressed Hydrogen which then evaporates into a freezing vapour.
How are they Powered? Propane refrigerators also have the capacity to operate without electricity.
The sole requirement of this type of refrigeration to operate is the ammonia/water mixture, which needs to be constantly heated to power the refrigeration process.
As electricity isn't essential this makes them an ideal choice for RV and caravan owners or anyone who appreciates the great outdoors.
Let's face it when you are camping you won't always have the convenience of electricity to plug in to at every destination.
As a result Propane Refrigerators remain viable and have even enjoyed a resurgance in recent times.