F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
LIGHTING; HEATING
F28
HEAT EXCHANGE IN GENERAL (heat-transfer, heat-exchange or heat-storage materials C09K 5/00; arrangement or mounting of heat-exchangers in air-conditioning, air-humidification or ventilation F24F 13/30)

Note(s)

  • In this class, the following expressions are used with the meanings indicated:
    • "heat exchange" means the heating or cooling of a fluid or fluent solid by direct or indirect contact with a heated or cooled fluid or fluent solid;
    • "heat transfer" means the heating or cooling of a fluid or fluent solid by direct contact with a heated or cooled surface or body.
  • Apparatus using heat exchange or heat transfer (as defined in Note (1) above) for specific purposes is classified either in subclass F28B or in the appropriate subclasses of, for example, classes F22, F24, F25, F26, or F27; if no such other subclass is appropriate, such apparatus is classified in subclass F28C or F28D.
F28B
STEAM OR VAPOUR CONDENSERS (condensation of vapours B01D 5/00; condensation during pretreatment of gases prior to electrostatic precipitation of dispersed particles B03C 3/014; steam engine plants having condensers F01K; liquefaction of gases F25J; details of heat-exchange or heat-transfer arrangements of general application F28F)
F28C
HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION (safety devices in general F16P; fluid heaters having heat generating means F24H; with an intermediate heat-transfer medium coming into direct contact with heat-exchange media F28D 15/00-F28D 19/00; details of heat-exchange apparatus of general application F28F)
F28D
HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general application F28F); HEAT STORAGE PLANTS OR APPARATUS IN GENERAL [4]
Subclass index
HEAT-EXCHANGE APPARATUS WITHOUT INTERMEDIATE HEAT-TRANSFER MEDIA OR BODIES
With stationary conduit assemblies
for only one medium using: mass of fluid; trickle or film; the cooling effect of evaporation 1/00, 3/00, 5/00
for both media: by tubular conduits; by plate-like conduits 7/00, 9/00
With moving conduit assemblies 11/00
With fluidised bed 13/00
HEAT-EXCHANGE APPARATUS WITH INTERMEDIATE HEAT-TRANSFER MEDIA OR BODIES
With the intermediate medium in closed tubes passing into or through the conduit walls 15/00
In which the intermediate medium or body is contacted successively by the other media 17/00, 19/00
HEAT STORAGE PLANTS OR APPARATUS 20/00
OTHER HEAT-EXCHANGE APPARATUS 21/00
F28F
DETAILS OF HEAT-EXCHANGE OR HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water or air traps, air venting F16)
Subclass index
DETAILS AND THEIR ARRANGEMENTS
Elements for heat exchange or transfer and assemblies thereof
tubular; plate-like; for movement; others 1/00, 3/00, 5/00, 7/00
auxiliary supports for elements; sealing 9/00, 11/00
Casings and header boxes 9/00
Preventing deposits or corrosion 17/00, 19/00
Special features of heat-exchange apparatus
characterised by the selection of: constructional material; intermediate heat-exchange material 21/00, 23/00
component parts of trickle coolers 25/00
MODIFYING HEAT-TRANSFER; CONTROL OF APPARATUS 13/00, 27/00
SUBJECT MATTER NOT PROVIDED FOR IN OTHER GROUPS OF THIS SUBCLASS 99/00
F28G
CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OF BOILERS (cleaning pipes or tubes in general B08B 9/02; devices or arrangements for removing water, minerals, or sludge from boilers while the boiler is in operation, or which remain in position while the boiler is in operation, or are specifically adapted to boilers without any other utility F22B 37/48; removal or treatment of combustion products or combustion residues F23J; removing ice from heat-exchange apparatus F28F 17/00)
Subclass index
APPLIANCES FOR CLEANING: NON-ROTARY; ROTARY; OTHERS; DETAILS 1/00, 3/00, 13/00, 15/00
CLEANING PROCESSES BY: DISTORTION; VIBRATION; FLUSHING OR WASHING; COMBUSTION; OTHERS 5/00, 7/00, 9/00, 11/00, 13/00
COMBINATION OF PROCESSES 13/00