FIELD: heating system.
SUBSTANCE: invention relates to waste gas cooler or a charge air cooler comprising a plate package (2) consisting of several elongated plate pairs (32). Accordingly, two plates (18, 18') connected to each other form a second working medium channel (4), and a first working medium channel (30) is formed between the two pairs of plates, wherein the first working medium channel (30) is surrounded by two second working medium channels (4). Each second working medium channel (4) is connected to at least one collecting channel (11, 12) of the cooling agent.
EFFECT: increase of heat transfer.
16 cl, 21 dwg
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