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

|  | F01 - F04 |
Subsection index
MACHINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F04C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F04B
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
ENGINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F03C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F03C
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
PUMPS |
positive displacement |
rotary or oscillating piston | F04C
reciprocating piston or other | F04B
non-positive displacement | F04D

LIGHTING; HEATING

|  | F25 |
REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES

|  | F25B |
REFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS (heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion Fulltext... Hierarchy... Expanded...C09K 5/00; pumps, compressors Fulltext... Hierarchy... Expanded...F04; use of heat pumps for domestic or space-heating or for domestic hot-water supply Fulltext... Hierarchy... Expanded...F24D; air-conditioning, air-humidification Fulltext... Hierarchy... Expanded...F24F; fluid heaters using heat pumps Fulltext... Hierarchy... Expanded...F24H)

|  | F25B |
Note(s) Attention is drawn to Note (2) following the title of subclass Fulltext... Hierarchy... Expanded...F24F. [5]

|  | F25B |
Subclass index
MODE OF OPERATION |
Compression type |
characterised by the cycle | 1/00, 13/00
characterised by the arrangement |
self-contained rotary; with several evaporation circuits; with several condenser circuits; with cascade operation | 3/00; 5/00; 6/00; 7/00
characterised by the refrigerant | 9/00
using turbines | 11/00
Sorption type | 15/00, 17/00
Other types having a single mode of operation, using: evaporation without recovery; electric or magnetic effects; other effect | 19/00; 21/00; 23/00
Combinations: of above modes of operation; of heating and refrigerating | 25/00; 29/00
Heat pumps | 30/00
Using special energy source | 27/00
DETAILS, ARRANGEMENTS, OR COMPONENTS |
Components: boilers, analysers, rectifiers; boiler-absorbers; absorbers, adsorbers; evaporators, condensers; subcoolers, desuper- heaters, superheaters | 33/00; 35/00; 37/00; 39/00; 40/00
Arrangements |
compressor arrangement; fluid circulation; separating or purifying gases | 31/00; 41/00; 43/00
for charging or discharging refrigerant; for combating corrosion or deposits | 45/00; 47/00
Mounting of control and safety devices | 49/00

|  | F25B 1/00 - F25B 13/00 |
Compression machines, plant, or systems

P:120 |  | F25B 1/00 |
Compression machines, plant or systems with non-reversible cycle (Fulltext... Hierarchy... Expanded...F25B 3/00, Fulltext... Hierarchy... Expanded...F25B 5/00, Fulltext... Hierarchy... Expanded...F25B 6/00, Fulltext... Hierarchy... Expanded...F25B 7/00, Fulltext... Hierarchy... Expanded...F25B 9/00 take precedence) [5]

|  | F25B 1/02 |
· | with compressor of reciprocating-piston type (Fulltext... Hierarchy... Expanded...F25B 1/10 takes precedence)

|  | F25B 1/04 |
· | with compressor of rotary type (Fulltext... Hierarchy... Expanded...F25B 1/10 takes precedence)

|  | F25B 1/047 |
· · | of screw type [5]

|  | F25B 1/053 |
· · | of turbine type [5]

|  | F25B 1/06 |
· | with compressor of jet type, e.g. using liquid under pressure (Fulltext... Hierarchy... Expanded...F25B 1/10 takes precedence)

|  | F25B 1/08 |
· · | using vapour under pressure

|  | F25B 1/10 |
· | with multi-stage compression (with cascade operation Fulltext... Hierarchy... Expanded...F25B 7/00)

P:60 |  | F25B 3/00 |
Self-contained rotary compression machines, i.e. with compressor, condenser, and evaporator rotating as a single unit

P:90 |  | F25B 5/00 |
Compression machines, plant, or systems, with several evaporator circuits, e.g. for varying refrigerating capacity (with cascade operation Fulltext... Hierarchy... Expanded...F25B 7/00)

|  | F25B 5/02 |
· | arranged in parallel [5]

|  | F25B 5/04 |
· | arranged in series [5]

P:100 |  | F25B 6/00 |
Compression machines, plant, or systems, with several condenser circuits [5]

|  | F25B 6/02 |
· | arranged in parallel [5]

|  | F25B 6/04 |
· | arranged in series [5]

P:80 |  | F25B 7/00 |
Compression machines, plant, or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit (Fulltext... Hierarchy... Expanded...F25B 9/00 takes precedence)

P:50 |  | F25B 9/00 |
Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point

|  | F25B 9/02 |
· | using Joule-Thompson effect; using vortex effect

|  | F25B 9/04 |
· · | using vortex effect [5]

|  | F25B 9/06 |
· | using expanders (Fulltext... Hierarchy... Expanded...F25B 9/10 takes precedence) [5]

|  | F25B 9/08 |
· | using ejectors (Fulltext... Hierarchy... Expanded...F25B 9/10 takes precedence) [5]

|  | F25B 9/10 |
· | with several cooling stages [5]

|  | F25B 9/12 |
· | using 3He-4He dilution [5]

|  | F25B 9/14 |
· | characterised by the cycle used, e.g. Stirling cycle [5]

P:70 |  | F25B 11/00 |
Compression machines, plant, or systems, using turbines, e.g. gas turbines

|  | F25B 11/02 |
· | as expanders (Fulltext... Hierarchy... Expanded...F25B 9/06 takes precedence) [5]

|  | F25B 11/04 |
· · | centrifugal type [5]

P:110 |  | F25B 13/00 |
Compression machines, plant, or systems, with reversible cycle (defrosting cycles Fulltext... Hierarchy... Expanded...F25B 47/02)

|  | F25B 15/00 - F25B 17/00 |
Sorption machines, plant, or systems

P:140 |  | F25B 15/00 |
Sorption machines, plant, or systems, operating continuously, e.g. absorption type

|  | F25B 15/02 |
· | without inert gas (Fulltext... Hierarchy... Expanded...F25B 15/12, Fulltext... Hierarchy... Expanded...F25B 15/14, Fulltext... Hierarchy... Expanded...F25B 15/16 take precedence)

|  | F25B 15/04 |
· · | the refrigerant being ammonia evaporated from aqueous solution

|  | F25B 15/06 |
· · | the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide

|  | F25B 15/08 |
· · | the refrigerant being sulfuric acid

|  | F25B 15/09 |
· · | the refrigerant being hydrogen desorbed from a hydride [5]

|  | F25B 15/10 |
· | with inert gas (Fulltext... Hierarchy... Expanded...F25B 15/12, Fulltext... Hierarchy... Expanded...F25B 15/14, Fulltext... Hierarchy... Expanded...F25B 15/16 take precedence)

|  | F25B 15/12 |
· | with resorber (Fulltext... Hierarchy... Expanded...F25B 15/14 takes precedence)

|  | F25B 15/14 |
· | using osmosis

|  | F25B 15/16 |
· | using desorption cycle

P:130 |  | F25B 17/00 |
Sorption machines, plant, or systems, operating intermittently, e.g. absorption or adsorption type

|  | F25B 17/02 |
· | the absorbent or adsorbent being a liquid, e.g. brine (Fulltext... Hierarchy... Expanded...F25B 17/10 takes precedence)

|  | F25B 17/04 |
· · | with two or more boilers operating alternately

|  | F25B 17/06 |
· · | with the boiler and evaporator built-up as a unit in a tiltable or revolving arrangement

|  | F25B 17/08 |
· | the absorbent or adsorbent being a solid, e.g. salt (Fulltext... Hierarchy... Expanded...F25B 17/12 takes precedence) [5]

|  | F25B 17/10 |
· | using the endothermic solution of salt

|  | F25B 17/12 |
· | using desorption of hydrogen from a hydride [5]

|  | F25B 19/00 - F25B 23/00 |
Machines, plant, or systems, with a single mode of operation, not covered by groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F25B 1/00-F25B 17/00

P:150 |  | F25B 19/00 |
Machines, plant, or systems, using evaporation of a refrigerant but without recovery of the vapour

|  | F25B 19/02 |
· | using fluid jet, e.g. of steam

|  | F25B 19/04 |
· · | using liquid jet, e.g. of water

P:40 |  | F25B 21/00 |
Machines, plant, or systems, using electric or magnetic effects

|  | F25B 21/02 |
· | using Peltier effect; using Nernst-Ettinghausen effect (thermoelectric elements Fulltext... Hierarchy... Expanded...H01L 35/00, Fulltext... Hierarchy... Expanded...H01L 37/00)

|  | F25B 21/04 |
· · | reversible [5]

P:160 |  | F25B 23/00 |
Machines, plant, or systems, with a single mode of operation not covered by groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F25B 1/00-F25B 21/00, e.g. using selective radiation effect

P:30 |  | F25B 25/00 |
Machines, plant, or systems, using a combination of modes of operation covered by two or more of the groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F25B 1/00-F25B 23/00 (combinations of two or more modes of operation covered by a single main group, see the relevant group)

|  | F25B 25/02 |
· | Compression-sorption machines, plants, or systems

P:0 |  | F25B 27/00 |
Machines, plant, or systems, using particular sources of energy (Fulltext... Hierarchy... Expanded...F25B 30/06 takes precedence)

|  | F25B 27/02 |
· | using waste heat, e.g. from internal-combustion engines

P:10 |  | F25B 29/00 |
Combined heating and refrigeration systems, e.g. operating alternately or simultaneously [5]

P:20 |  | F25B 30/00 |
Heat pumps [5]

|  | F25B 30/00 |
Note(s) When classifying heat pump circuits or systems, groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F25B 1/00-F25B 25/00 and Fulltext... Hierarchy... Expanded...F25B 29/00 take precedence over group Fulltext... Hierarchy... Expanded...F25B 30/00. [5]

|  | F25B 30/02 |
· | of the compression type [5]

|  | F25B 30/04 |
· | of the sorption type [5]

|  | F25B 30/06 |
· | characterised by the source of low potential heat [5]

|  | F25B 31/00 - F25B 49/00 |
Component parts or details

P:210 |  | F25B 31/00 |
Compressor arrangements (compressors per se Fulltext... Hierarchy... Expanded...F04)

|  | F25B 31/02 |
· | of motor-compressor units

P:240 |  | F25B 33/00 |
Boilers; Analysers; Rectifiers (boiler-absorbers Fulltext... Hierarchy... Expanded...F25B 35/00)

P:230 |  | F25B 35/00 |
Boiler-absorbers, i.e. boilers usable for absorption or adsorption

|  | F25B 35/02 |
· | using a liquid as sorbent, e.g. brine

|  | F25B 35/04 |
· | using a solid as sorbent

P:250 |  | F25B 37/00 |
Absorbers; Adsorbers (boiler-absorbers Fulltext... Hierarchy... Expanded...F25B 35/00; separating processes involving the treatment of liquids with solid sorbents Fulltext... Hierarchy... Expanded...B01D 15/00; separation of gases or vapours by adsorption Fulltext... Hierarchy... Expanded...B01D 53/02; separation of gases or vapours by absorption Fulltext... Hierarchy... Expanded...B01D 53/14; investigating using adsorption or absorption Fulltext... Hierarchy... Expanded...G01N 30/00)

P:260 |  | F25B 39/00 |
Evaporators; Condensers

|  | F25B 39/02 |
· | Evaporators

|  | F25B 39/04 |
· | Condensers

P:200 |  | F25B 40/00 |
Subcoolers, desuperheaters or superheaters [5]

|  | F25B 40/02 |
· | Subcoolers [5]

|  | F25B 40/04 |
· | Desuperheaters [5]

|  | F25B 40/06 |
· | Superheaters [5]

P:220 |  | F25B 41/00 |
Fluid-circulation arrangements, e.g. for transferring liquid from evaporator to boiler (pumps per se, sealings therefor Fulltext... Hierarchy... Expanded...F04)

|  | F25B 41/02 |
· | using electro-osmosis

|  | F25B 41/04 |
· | Disposition of valves (valves per se Fulltext... Hierarchy... Expanded...F16K)

|  | F25B 41/06 |
· | Flow restrictors, e.g. capillary tubes; Disposition thereof

P:180 |  | F25B 43/00 |
Arrangements for separating or purifying gases or liquids (in analysers or rectifiers Fulltext... Hierarchy... Expanded...F25B 33/00); Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat (Fulltext... Hierarchy... Expanded...F25B 40/00 takes precedence) [5]

|  | F25B 43/02 |
· | for separating lubricants from the refrigerant

|  | F25B 43/04 |
· | for withdrawing non-condensible gases

P:270 |  | F25B 45/00 |
Arrangements for charging or discharging refrigerant

P:190 |  | F25B 47/00 |
Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass

|  | F25B 47/02 |
· | Defrosting cycles [5]

P:170 |  | F25B 49/00 |
Arrangement or mounting of control or safety devices (testing refrigerators Fulltext... Hierarchy... Expanded...G01M; control in general Fulltext... Hierarchy... Expanded...G05)

|  | F25B 49/02 |
· | for compression type machines, plant or systems [5]

|  | F25B 49/04 |
· | for sorption type machines, plant or systems [5]