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An absorption-cooling
machine consists of the same parts as the compression-cooling machine.
But in stead of an electric driven compressor, with the absorption cooling
machine a 'thermal compresso'’ is used, driven by heat. Absorption
utilises a thermal process, which takes place in the absorber and generator
section of the chiller. In the absorber a lithium bromide solution absorbs
low-pressure refrigerant water vapor produced in the evaporator. Operation
in a deep vacuum causes the water to evaporate at low temperature, providing
the refrigeration effect to produce chilled water. The now diluted lithium
bromide solution is pumped to the generator where heat is added to boil
off the refrigerant, supplying vapor to the condenser. Refrigerant liquid
returns to the evaporator while reconcentrated solution returns to the
absorber to complete the cycle. Besides the couple lithium bromide / water
also the couple water / ammonia is used. |
