F
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  
LIGHTING; HEATING
 F28
HEAT EXCHANGE IN GENERAL
 F28

Note(s)

  1. 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; alpha
    • "heat transfer" means the heating or cooling of a fluid or fluent solid by direct contact with a heated or cooled surface or body.
  2. 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 sub-clas F28C or D.
 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)
 F28C 1/00
Direct-contact trickle coolers, e.g. cooling towers (building construction E04H 5/12; enclosed spaces cooled by trickle F25; component parts of trickle coolers F28F 25/00)
 F28C 1/02
·  with counter-current only
 F28C 1/04
·  with cross-current only
 F28C 1/06
·  with both counter-current and cross-current
 F28C 1/08
·  Arrangements for recovering heat from exhaust steam
 F28C 1/10
·  Arrangements for suppressing noise of exhaust steam
 F28C 1/12
·  Arrangements for preventing clogging by frost  [3]
 F28C 1/14
·  comprising also a non-direct contact heat exchange  [3]
 F28C 1/16
·  Arrangements for preventing condensation, precipitation or mist formation, outside the cooler (F28C 1/14 takes precedence)  [3]
 F28C 3/00
Other direct-contact heat-exchange apparatus
 F28C 3/02
·  the heat-exchange media both being gases or vapours
 F28C 3/04
·  the heat-exchange media both being liquids
 F28C 3/06
·  the heat-exchange media being a liquid and a gas or vapour (temperators for cooling steam F22)
 F28C 3/08
·  ·  with change of state, e.g. absorption, evaporation, condensation (generating steam under pressure F22)
 F28C 3/10
·  one heat-exchange medium at least being a fluent solid, e.g. a particulate material
 F28C 3/12
·  ·  the heat-exchange medium being a particulate material and a gas, vapour, or liquid
 F28C 3/14
·  ·  ·  the particulate material moving by gravity, e.g. down a tube
 F28C 3/16
·  ·  ·  the particulate material forming a bed, e.g. fluidised, on vibratory sieves
 F28C 3/18
·  ·  ·  the particulate material being contained in rotating drums