FIELD: heat-power engineering; drying and thermal units in farming and public services; construction engineering. SUBSTANCE: proposed heat generator has double tube system; secured in tube of lesser diameter is heat source and air flow passage and damper are provided in inter-tube space; ratio 
ranges from 0.25 to 0.75, where D1 and D are diameters of inner and outer tubes respectively, L1 mm and L is length of inner and outer tubes, mm. EFFECT: simplified construction; enhanced efficiency. 1 dwg
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