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lithium bromide (LiBr) is used as a refrigerant in absorption chiller systems, albeit in an indirect way. In these systems, water is the actual refrigerant, and lithium bromide is used as an absorbent. The process works by leveraging the properties of lithium bromide to absorb the water vapor, which in turn causes a cooling effect.
Here’s a quick breakdown of how it functions within an absorption chiller:
- The refrigeration cycle starts with the evaporation of water at low pressure, which absorbs heat and creates a cooling effect.
- The water vapor is then absorbed by a concentrated lithium bromide solution, which results in the release of heat (exothermic reaction).
- The lithium bromide and water mixture is then heated up to separate the water from the solution (this is where an external heat source is required).
- The water is condensed back into a liquid form and recycled back into the system to start the process over.
The use of lithium bromide as a refrigerant is particularly different from traditional refrigerants like Freon in vapor compression refrigeration systems. Lithium bromide is featured in a closed-loop process, typically in industrial or large-scale commercial air conditioning, where its ability to operate on heat as an energy source (such as steam or hot water) rather than electricity is a key advantage.
Learn more about lithium bromide in the related article:
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