IPC Classification

Class code (prefix) Descriptions Number of results
F24J 1/00 Apparatus or devices using heat produced by exothermal chemical reactions other than by combustion (for cooking-vessels A47J 36/28;self-heating compresses A61F 7/03;materials for the production of heat or cold undergoing non-reversible chemical reactions, other than by combustion, when used C09K 5/18)
F24J 2/00 Use of solar heat, e.g. solar heat collectors (distillation or evaporation of water using solar energy C02F 1/14;roof covering aspects of energy collecting devices E04D 13/18;devices for producing mechanical power from solar energy F03G 6/00;semiconductor devices specially adapted for converting solar energy into electrical energy H01L 31/00;photovoltaic [PV] cells including means directly associated with the PV cell to utilise heat energy H01L 31/525;PV modules including means associated with the PV module to utilise heat energy H02S 40/44)
F24J 2/02 Solar heat collectors with support for article heated, e.g. stoves, ranges, crucibles, furnaces or ovens using solar heat
F24J 2/04 Solar heat collectors having working fluid conveyed through collector
F24J 2/05 surrounded by a transparent enclosure, e.g. evacuated solar collectors
F24J 2/06 having concentrating elements (optical elements or systems per seG02B)
F24J 2/07 Receivers working at high temperature, e.g. for solar power plants
F24J 2/08 having lenses as concentrating elements
F24J 2/10 having reflectors as concentrating elements
F24J 2/12 parabolic
F24J 2/13 hemispherical
F24J 2/14 semi-cylindrical or cylindro-parabolic
F24J 2/15 conical
F24J 2/16 having flat plates
F24J 2/18 spaced, opposed interacting reflecting surfaces
F24J 2/20 the working fluid being conveyed between plates
F24J 2/22 having extended surfaces, e.g. protrusions, corrugations (F24J 2/28 takes precedence)
F24J 2/23 the working fluid trickling freely over collector elements
F24J 2/24 the working fluid being conveyed through tubular heat absorbing conduits
F24J 2/26 having extended surfaces, e.g. protrusions (F24J 2/28 takes precedence)
F24J 2/28 having permeable mass, foraminous or porous materials
F24J 2/30 with means to exchange heat between plural fluids
F24J 2/32 having evaporator and condenser section, e.g. heat pipe
F24J 2/34 having heat storage mass
F24J 2/36 Rollable or foldable collector units
F24J 2/38 employing tracking means (F24J 2/02, F24J 2/06 take precedence;rotary supports or mountings therefor F24J 2/54;supporting structures of photovoltaic modules for generation of electric power specially adapted for solar tracking systems H02S 20/32)
F24J 2/40 Control arrangements
F24J 2/42 Solar heat systems not otherwise provided for
F24J 2/44 having thermosiphonic circulation
F24J 2/46 Component parts, details or accessories of solar heat collectors
F24J 2/48 characterised by the absorber material
F24J 2/50 Transparent coverings
F24J 2/51 Thermal insulation (F24J 2/50 takes precedence)
F24J 2/52 Arrangement of mountings or supports
F24J 2/54 specially adapted for rotary movement
F24J 3/00 Other production or use of heat, not derived from combustion (use of solar heat F24J 2/00)
F24J 3/06 using natural heat
F24J 3/08 using geothermal heat (devices for producing mechanical power from geothermal energy F03G 4/00)