#$%^&*AU2014101095A420141113.pdf#####- 14Abstract 1. Solar thermal air flow heating tube device and solar thermal air flow heating tube system. 2.1. The invention relates to a solar thermal air flow heating tube device (1) and a solar thermal air flow heating tube system (21, 21') equipped therewith. 2.2. According to the invention the solar thermal air flow heating tube device (1) comprises a twin-wall evacuated solar tube (2) comprising an inner tube (3) having a first end (7) closed and a second end (8) opened, and an outer tube (4) coaxially surrounding the inner tube, said inner and outer tubes defining an evacuated annular space (11) inbetween, and a solar radiation absorbing coating (6) being provided on an outside and/or inside wall of the inner tube, and an air flow guiding element (12) arranged in an interior of the inner tube to define a first air flow channel (13) and a second air flow channel (14), said second air flow channel being separated from the first air flow channel and serially connected to said first air flow channel adjacent to the closed first end of the inner tube. 2.3. Application e.g. for space heating or industrial drying processes, 3. Fig. 1.P 54113 EP 9. April 2014 1/2 Fig. 1 hotair Fig. 2 1 hoot air 16 16 8 cold air cold air cold air ~ T 8 10 10 6 12 6 3 12 2 14 21 313 313 4 4 715 715 9 9 5 Fig. 3 33 30 3021 hot air 28 229 10 cold air ~27 22 13 30 30 32 1 26:
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