F
SECTION F — MECHANICAL ENGINEERING
;
LIGHTING
;
HEATING
;
WEAPONS
;
BLASTING
LIGHTING
;
HEATING
F28
HEAT EXCHANGE IN GENERAL
(heat-transfer, heat-exchange or heat-storage materials
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C09K 5/00
; arrangement or mounting of heat-exchangers in air-conditioning, air-humidification or ventilation
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F24F 13/30
)
F28
Note(s)
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;
"heat transfer" means the heating or cooling of a fluid or fluent solid by direct contact with a heated or cooled surface or body.
Apparatus using heat exchange or heat transfer (as defined in Note (1) above) for specific purposes is classified either in subclass
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F28B
or in the appropriate subclasses of, for example, classes
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F22
,
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F24
,
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F25
,
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F26
, or
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F27
; if no such other subclass is appropriate, such apparatus is classified in subclass
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F28C
or
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F28D
.
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
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F16P
; fluid heaters having heat generating means
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F24H
; with an intermediate heat-transfer medium coming into direct contact with heat-exchange media
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F28D 15/00
-
F28D 19/00
; details of heat-exchange apparatus of general application
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F28F
)
F28C 1/00
Direct-contact trickle coolers, e.g. cooling towers
(building construction
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E04H 5/12
; enclosed spaces cooled by trickle
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F25
; component parts of trickle coolers
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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
[5]
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
(
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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
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F22
)
F28C 3/08
· ·
with change of state, e.g. absorption, evaporation, condensation
(generating steam under pressure
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F22
)
F28C 3/10
·
one heat-exchange medium at least being a fluent solid, e.g. a particulate material
F28C 3/12
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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