Heat recuperator for exchanging heat from outlet fumes of combustion heater, has external chamber presenting opening for allowing air to be heated, where vacuum is created in external chamber through perforations

摘要

The recuperator has an inner tube (2) for conveying of fumes, and an outer tube (3). The inner tube and the outer tube are arranged to recover heat by circulation of air. A concentric tubular wall (4) is placed between the inner and outer tubes, where the wall is locally perforated for delimiting an internal chamber (5) with the inner tube, and for delimiting an external chamber (6) with the outer tube. The external chamber presents an opening (7) for allowing air to be heated, and the internal chamber presents an exit (8). A vacuum is created in the external chamber through perforations.