Lithium Bromide Absorption Chiller

Regeneration of LiBr solution

As the lithium-bromide absorbent soaks up the refrigerant, it becomes more and more diluted, reducing its ability to absorb more refrigerant. In order to continue the cycle, the absorbent must be re-concentrated. This is accomplished by constantly pumping dilute solution from the absorber to the low temperature generator, where the addition of residual heat (hot water, steam, or natural gas) boils the refrigerant from the absorbent. Often this generator is used to recover waste heat from the plant. Once the refrigerant is removed, the re-concentrated lithium bromide solution returns to the absorber, ready to resume the absorption process and the free refrigerant is sent to a condenser. In this regeneration stage, waste heat from steam or hot water is an utility.

Alternative Names

Steam Operated Absorption Chiller

Steam LiBr Absorption Chiller

Steam Powered Absorption Industrial Air Conditioner

General Dscriptions

The absorption chiller is a machine that produces chilled water by using the residual heat from sources such as steam, hot water or hot gas. Chilled water is produced by the principle of refrigeration that liquid (refrigerant), which evaporates at low temperature, absorbs heat from its surrounding environment while evaporating. Pure water is usually used as refrigerant, whereas lithium bromide (LiBr) solution is used as absorbent.

Application

Steam Type absorption chiller provides cooling for air conditioning and industrial process, uses steam as driving energy, fits in power plant with abundant steam source, chemical companies and cities with heat pipeline system, etc, where also needs cooling in summer and chilled water for processing.

Advanages
The primary advantage of absorption chillers is much lower electricity costs. Costs can be even further decreased if natural gas is available at a low price or if it's possible to utilize a source of low grade heat, such as steam, that is otherwise wasted in a plant. So the absorption chiller system saves operation/ energy cost in long term. Besides, absorption chillers are more environmental friendly than electrical chillers as working without freon. 

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