| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F28 | KL | 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) |
| F28C | UKL | 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) |
| F28C 1/00 | HGR | 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 | UGR1 | | . | with counter-current only |
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| F28C 1/04 | UGR1 | |
| F28C 1/06 | UGR1 | | . | with both counter-current and cross-current |
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| F28C 1/08 | UGR1 | | . | Arrangements for recovering heat from exhaust steam |
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| F28C 1/10 | UGR1 | | . | Arrangements for suppressing noise [5] |
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| F28C 1/12 | UGR1 | | . | Arrangements for preventing clogging by frost [3] |
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| F28C 1/14 | UGR1 | | . | comprising also a non-direct contact heat exchange [3] |
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| F28C 1/16 | UGR1 | | . | Arrangements for preventing condensation, precipitation or mist formation, outside the cooler (F28C 1/14 takes precedence) [3] |
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| F28C 3/00 | HGR | Other direct-contact heat-exchange apparatus |
| F28C 3/02 | UGR1 | | . | the heat-exchange media both being gases or vapours |
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| F28C 3/04 | UGR1 | | . | the heat-exchange media both being liquids |
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| F28C 3/06 | UGR1 | | . | the heat-exchange media being a liquid and a gas or vapour (temperators for cooling steam F22) |
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| F28C 3/08 | UGR2 | | . . | with change of state, e.g. absorption, evaporation, condensation (generating steam under pressure F22) |
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| F28C 3/10 | UGR1 | | . | one heat-exchange medium at least being a fluent solid, e.g. a particulate material |
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| F28C 3/12 | UGR2 | | . . | the heat-exchange medium being a particulate material and a gas, vapour, or liquid |
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| F28C 3/14 | UGR3 | | . . . | the particulate material moving by gravity, e.g. down a tube |
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| F28C 3/16 | UGR3 | | . . . | the particulate material forming a bed, e.g. fluidised, on vibratory sieves |
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| F28C 3/18 | UGR3 | | . . . | the particulate material being contained in rotating drums |
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