FIELD: heat exchangers used for heating liquid heat-transfer agents by heat of gases. SUBSTANCE: heat exchanger stacks of heat exchanger are made in form of seamless tubes with rectangular ends. Their adjacent sides are combined. Cavities inside stacks are formed by wavy recesses provided on flattened side surfaces; end form walls of housing. Heat exchanger includes housing, core and inlet and outlet branch pipes. EFFECT: low cost of stamped stacks; ease in cleaning and operation; adequate turbulization of heat-transfer agents. 2 cl, 6 dwg
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