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With Single Stage Absorption &
Single Stage Desorption
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- Liquid ammonia evaporates in the evaporator (HE1) to give the
refrigeration effect.
- These vapours are condensed (HE6) and liquid ammonia is stored
in the receiver (V).
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Ammonia vapours from evaporator are used for
sub-cooling (HE2) the liquid ammonia supplied to evaporator.
This improves energy efficiency of the plant.
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The receiver supplies liquid ammonia to
evaporator.
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Ammonia vapours are absorbed in absorber (HE3). The heat of
absorption is removed by cooling water.
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Weak ammonia solution in the desorber is sent to absorber for
absorption.
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The strong ammonia solution is pumped to desorber (HE4).
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A solution heat exchanger (HE7) is provided to cool the weak
solution before entering the absorber and preheat the strong
solution before entering the desorber. This greatly improves of
energy efficiency of the plant.
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Heat is supplied in the desorber to boil off the ammonia from
strong solution. These vapours also contain some water vapours
due to affinity between ammonia and water.
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The traces of water in the evaporator are bleed from evaporator to
absorber through Bleed Heat Exchanger (HE8). Bleed Heat Exchanger
further subcools liquid ammonia and improves efficiency.
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AARP With Single Stage Absorption
& Single Stage Desorption
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Single stage Ammonia Absorption Refrigeration Plants are used for
refrigeration temperature ranging from +5 to -55 Deg.C, heat source
temperature requirement varies from 95 Deg.C to 180 Deg.C.
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