Heating device with improved efficiency

A burner part, comprising

• a combustion chamber, comprising
• inlet ducts or inlet openings for primary air and secondary air,
• a firing grate and a burner
• a feed opening for combustible material,
• a combustible material-waste collection chamber and/or a combustible material-waste discharge device
• a storage container or a pellet storage container, which is connected to the combustion chamber via the feed opening for combustible material,
• a double-walled, internally hollow combustion-chamber wall, which has an upper opening which is located above the combustion zone leading into the combustion chamber, and a lower opening, configured to get tertiary air introduced,
• a flue-gas duct arranged on the other side of the combustion chamber in relation to the double-walled, internally hollow combustion-chamber wall and leading the flue gas downwards from above along its wall adjacent to the combustion chamber,
• adjacent to the flue-gas duct, arranged in the flow direction of the flue gas beyond the flue-gas duct, a heat-exchanger area comprising,
• initially, a flat-tube flue-gas heat exchanger,
• then, a tertiary-air heat exchanger comprising inlet ducts or inlet openings for tertiary air and discharges for the heated tertiary air connected to the double-walled, internally hollow combustion-chamber wall,
• a flue-gas ventilation stack,
• a radiant-heat exchanger located above the combustion chamber,
• a flue-gas flap at the upper end of the flue-gas duct, which, when open, connects the flue-gas duct to the stack.

A method for increasing the efficiency of a heating device by

• firing a combustion in a combustion chamber under supply of primary air through the combustion zone and supply of secondary air at the upper end of the combustion zone, conducting the flue gas via first a flat-tube flue-gas heat exchanger and then via a tertiary-air heat exchanger,
• conducting the tertiary air thus heated into a double-walled, internally hollow combustion-chamber wall for further heating,
• leading the heated tertiary air from the double-walled, internally hollow combustion-chamber wall into the combustion chamber above the combustion zone, and mixing with the flue gas,
• transferring heat to at least a part of the air to be heated by a heat exchanger located above the combustion chamber,
• transferring further heat to the air to be heated by an exhaust-air heat exchanger by a heat-transfer medium heated in the flat-tube flue-gas heat exchanger.

A heating device, comprising

• A) a burner part, comprising
• a combustion chamber, comprising
• inlet ducts or inlet openings for primary air and secondary air,
• a firing grate and a burner
• a feed opening for combustible material,
• a combustible material-waste collection chamber and/or a combustible material-waste discharge device,
• a storage container or a pellet storage container, which is connected to the combustion chamber via the feed opening for combustible material,
• a double-walled, internally hollow combustion-chamber wall, which comprises an upper opening which above the combustion zone leads into the combustion chamber, and comprises a lower opening or connection configured to get tertiary air introduced,
• a flue-gas duct arranged on the other side of the combustion chamber in relation to the double-walled, internally hollow combustion-chamber wall and leading the flue gas downwards from above along its wall adjacent to the combustion chamber,
• adjacent to the flue-gas duct, arranged in the flow direction of the flue gas beyond the flue-gas duct, a heat-exchanger area comprising,
• initially, a flat-tube flue-gas heat exchanger,
• then, a tertiary air heat exchanger comprising inlet ducts or inlet openings for tertiary air and discharges for the heated tertiary air connected to the double-walled, internally hollow combustion-chamber wall,
• a flue-gas ventilation stack,
• a radiant-heat exchanger located above the combustion chamber,
• a flue-gas flap at the upper end of the flue-gas duct, which, when open, connects the flue-gas duct to the stack,
• B) a heating part, comprising
• an air-intake part which sucks in air from above the radiant-heat exchanger or through the radiant-heat exchanger,
• an air-intake blower which at least partially sucks air from the air-intake part, and otherwise sucks in air from the environment,
• an exhaust-air heat exchanger with the same heat-transfer medium as the flat-tube flue-gas heat exchanger,
• an outlet opening for the heated air,
• wherein the flat-tube flue-gas heat exchanger forms a heat-exchanger circuit with the exhaust-air heat exchanger, and the two parts A) and B) are connected by the piping of the flat-tube flue-gas heat exchanger to the exhaust-air heat exchanger, and, where applicable, via the connection of the air-intake part of the heating part to the radiant-heat exchanger.