FIELD: district heating of objects of various designation. SUBSTANCE: boiler has a vessel in the form of a spiral forming a combustion chamber, variable-section gas conduit and a smoke flue, as well as interconnected plates forming a constant-section cavity for heat- transfer agent. Both inside and outside the plates are furnished with ribs located perpendicularly to the boiler axis, which enhances the efficiency of heat supply. Movement of heat-transfer agents in spiral ducts provides for a minimum pressure loss both for gas flow and liquid heat-transfer agent. EFFECT: enhanced efficiency. 2 dwg
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