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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 to F28D 19/00; details of heat-exchange apparatus of general application F28F)
Definition statement
This subclass covers:

Heat exchangers involving heat transfer between different media without separating wall, e.g. cooling towers.

References relevant to classification in this subclass
This subclass does not cover:

Mixers

Chemical or physical processes

Fluid heaters having heat generating means

Regenerative heat exchangers

Latent heat storage in direct contact with a heat exchange medium or another latent heat storage medium

Direct-contact trickle coolers, e.g. cooling towers (building construction E04H 5/12; enclosed spaces cooled by trickle F25; components parts of trickle coolers F28F 25/00; { indirect-contact cooling towers F28B 1/06})
Definition statement
This group covers:

Heat exchangers in which one medium trickles freely over a material and is brought into direct contact with a cooling medium. e.g. ambient air.

Cooling towers are classified according to the type of flow: counter-current, cross-current or both.

This group covers also:

  • The use of cooling towers for discharging exhaust gases.
  • Means for recovering heat from exhaust steam.
  • Noise suppressing means.
  • Freezing prevention means.
  • Combination wet/ dry sections (hybrid cooling towers).
  • Means for preventing mist formation above cooling towers.
References relevant to classification in this group
This group does not cover:

Building construction of cooling towers

Enclosed spaces cooled by trickle

F25

Dry cooling towers

Indirect contact heat exchangers in which one medium trickles freely over conduits

Indirect evaporative cooler

Component parts of trickle coolers

Other direct-contact heat-exchange apparatus
Definition statement
This group covers:

Direct contact heat exchangers without trickling of one heat exchange medium, e.g. direct contact between two gases , between two liquids or between a liquid and a gas without or with change of state; one of the heat exchange medium being a fluent solid, e.g. direct contact fluidized bed.

References relevant to classification in this group
This group does not cover:

Preservation of food by heating loose materials

Evaporating with heated gases or vapours or liquids in contact with a liquid

Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping

Mixing gases with liquids

Devices using other cold materials

Furnaces, ovens with cooling grates, endless belts, rotary drums

Direct contact condensers

Indirect contact fluidized bed

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Last Modified: 10/11/2013