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

Note(s)

  1. Apparatus using heat exchange or heat transfer (as defined below) for specific purposes is classified either in sub-class F28B or in the appropriate sub-classes of, for example, classes F22, F24, F25, F26, or F27; if no such other sub-class is appropriate, such apparatus is classified in sub-clas F28C or F28D.
  2. In this class, the following terms are used with the meanings indicated:
    1. "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.
    2. "Heat transfer" means the heating or cooling of a fluid or fluent solid by direct contact with a heated or cooled surface or body.
 F28C
HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUB-CLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION (safety devices in general F16P; with an intermediate heat-transfer medium coming into direct contact with heat-exchange media F28D 13/00-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 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