HEAT PRODUCER Russian patent published in 1999 - IPC

FIELD: air-heating systems of apartment and industrial buildings. SUBSTANCE: heat producer has flat ducts installed in its case and connected to gas-distributing heads one of which communicates with flue duct and other one, with exhaust pipe. Inner surface of flue duct is provided with corrugated screen that has longitudinal ribs; screen corrugations are arranged along flue duct axis; ribs are of different length increasing along flue gas flow; flat ducts are arranged in parallel to air flow. Straight, curvilinear, or zigzag-shaped partitions are installed inside flat ducts along flue-gas flow and joined to large sides. Air admission port in producer case is provided with sectionalized louvers with section-by-section blade- positioning angle. Tubular flue duct is built up of L- or U-shaped parts joined together. EFFECT: improved utilization of flue-gas heat, augmented heat transfer, and reduced air resistance. 4 cl, 5 dwg