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Absorption Cooling Technology

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2
Cooling Unit – How it Works
Boiler
A precise heat (electric heater element or gas flame) is applied to the boiler to begin
operation. Heat is transferred from the outer shell of the boiler through the weak
ammonia solution to the perk tube. (Most Zero product has a 110V capability - the
Consul, Crystal Cold and the Frostek do not)
The perk tube is provided with a rich ammonia solution (a high percentage of ammonia
to water) from the absorber tank. When heated, the ammonia in the rich ammonia
solution begins to vaporize (sooner than the water would) creating bubbles and a
percolating effect. The ammonia vapor pushes the now weakening solution up and out
of the perk tube. The ammonia vapor (gas) leaving the perk tube goes upward towards
the top of the cooling unit, passing through the rectifier. The rectifier is just a slightly
cooler section of pipe that causes water that might have vaporized to condense and
drop back down. The water separator at the top of the cooling unit (only on some
models) prevents any water that might have escaped the rectifier to condense and fall
back. After this point, pure ammonia vapor is delivered to the condenser. Meanwhile,
back at the perk tube, the weaker solution expelled from the perk tube by the ammonia
vapor drops into the weak ammonia solution surrounding the perk tube. Here, a little
more ammonia vapor is generated and rises. The weak ammonia solution flows down
ward and through the outer shell of the liquid heat exchanger, where heat is
transferred to the rich ammonia solution on its way to the perk tube. The weak
ammonia solution then flows to the top of the absorber coils and enters at a cooler
temperature.
Condenser
Ammonia vapor enters the condenser where it is cooled by air passing through the
metal fins of the condenser. The cooling effect of the condenser coupled with a series
of step-downs in pipe size forces the ammonia vapor into a liquid state, where it enters
the evaporator section.