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Absorption refrigeration: identify the refrigerant pairs For aqua–ammonia and lithium-bromide–water absorption refrigeration systems, identify the refrigerants respectively. Choose the correct pair in the stated order.

Difficulty: Easy

Water and water
Water and lithium bromide
Ammonia and lithium bromide
Ammonia and water

Correct Answer: Ammonia and water

Explanation:

Given systems

Aqua–ammonia (NH₃–H₂O)
Lithium bromide–water (LiBr–H₂O)

Concept/ApproachIn aqua–ammonia systems, ammonia is the refrigerant and water is the absorbent. In LiBr–water systems, water is the refrigerant and lithium bromide is the absorbent.

Final AnswerAmmonia and water

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