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These plants are used when two different refrigeration temperatures
have to be achieved from the same plant and capacity requirements
for both the stages is large and comparable to each other.
The absorption of refrigerant vapours at different temperatures
is done by the same stream of solution in successive manner. This
reduces the solution circulation losses. The requirement of heat
source temperature is comparable with single stage plants. These
plants have improved COP and power consumption compared to two
separate single stage plants.
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