How does an absorption refrigerator function?

An absorption refrigerator operates by utilizing a gas flame, which serves as the primary energy source for the refrigeration cycle. In this type of refrigerator, the process begins when a heat source, such as a gas flame, heats a solution of ammonia and water. This heating causes the ammonia to evaporate, separating it from the water. The gaseous ammonia is then condensed back into a liquid in a cooling unit, allowing it to absorb heat from the refrigerator's interior and thereby cooling it.

This process is distinct from traditional vapor-compression refrigerators, which rely on electrical energy to compress and circulate the refrigerant. The absorption system is particularly beneficial in situations without reliable electricity, making it ideal for use in remote locations or recreational vehicles, where gas can be more practical.

While other options mention different methodologies like electrical compression or stable electrical supply, they do not apply to the operational principles of absorption refrigerators, which rely on thermal energy rather than electrical energy for their functionality.