|  | F |
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

LIGHTING AND HEATING

|  | F28 |
HEAT EXCHANGE IN GENERAL

|  | F28 |
Note(s) Apparatus using heat exchange or heat transfer (as defined below) for specific purposes is classified either in sub-class Fulltext... Hierarchy... Expanded...F28B or in the appropriate sub-classes of, for example, classes Fulltext... Hierarchy... Expanded...F22, Fulltext... Hierarchy... Expanded...F24, Fulltext... Hierarchy... Expanded...F25, Fulltext... Hierarchy... Expanded...F26, or Fulltext... Hierarchy... Expanded...F27; if no such other sub-class is appropriate, such apparatus is classified in sub-clas Fulltext... Hierarchy... Expanded...F28C or Fulltext... Hierarchy... Expanded...F28D. In this class, the following terms 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.

|  | 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 Fulltext... Hierarchy... Expanded...F16P; fluid heaters having heat generating means Fulltext... Hierarchy... Expanded...F24H; with an intermediate heat-transfer medium coming into direct contact with heat-exchange media Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F28D 15/00-F28D 19/00; details of heat-exchange apparatus of general application Fulltext... Hierarchy... Expanded...F28F)

|  | F28C 1/00 |
Direct-contact trickle coolers, e.g. cooling towers (building construction Fulltext... Hierarchy... Expanded...E04H 5/12; enclosed spaces cooled by trickle Fulltext... Hierarchy... Expanded...F25; component parts of trickle coolers Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...F22)

|  | F28C 3/08 |
· · | with change of state, e.g. absorption, evaporation, condensation (generating steam under pressure Fulltext... Hierarchy... Expanded...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