CPC Definition - Subclass F25B

Last Updated Version: 2018.05
REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS ({evaporation or evaporation apparatus for physical or chemical purposes, e.g. evaporation of liquids for gas phase reactions B01B 1/005}; 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 C09K 5/00; pumps, compressors F04; use of heat-pumps for domestic- or space-heating or for domestic hot-water supply F24D; air-conditioning, air-humidification F24F; fluid heaters using heat pumps F24H)
Definition statement

This place covers:

Refrigeration machines, plants or systems; combined heating and refrigeration systems; heat-pump systems.

Cold production at temperatures below ambient, not transportation of heat.

Relationships with other classification places

Evaporation or evaporation apparatus for physical or chemical purposes, e.g. evaporation of liquids for gas phase reactions:

B01B 1/005

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:

C09K 5/00

Pumps, compressors:

F04

Use of heat-pumps for domestic- or space-heating or for domestic hot-water supply:

F24D

Air-conditioning, air-humidification:

F24F

Fluid heaters using heat pumps:

F24H

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Cooling of a manufacturing process

B23Q 11/00

Arrangements or adaptations of heating, cooling, ventilating or other air-treating devices specially for passenger or goods spaces of vehicles

B60H

Air plane air-conditioning

B64D 13/00

Mechanical-power-producing mechanisms

F03G

Piston compressors

F04B

Rotary compressors

F04C

Centrifugal compressors

F04D

Valves

F16K

Liquefaction, solidification, or separation of gases or gaseous mixtures by pressure and cold treatment

F25J

Details of heat-exchange or heat-transfer apparatus, of general application

F28F

Cooling of personal computers

G06F 1/20

Cooling of superconducting magnets

H01F 6/04

Modifications to facilitate cooling, ventilating or heating of different types of electric apparatus

H05K 7/20

Special rules of classification

When classifying heat pump circuits or systems, groups F25B 1/00 - F25B 25/00 and F25B 29/00 take precedence over group F25B 30/00.

Classification in F25B when refrigeration cycle of air-conditioner is claimed, except for reheat circuits: circulate to F24F 3/153.

F24F, when focus is on air side of refrigeration cycle.

B60H, when focus on refrigeration cycle is specific for a car (e.g. car speed, sunlight).

F24D 11/00, when focus is on heat water/heating heat pumps.

F25D, when a cold room is cooled.

Compression machines, plant, or systems with non-reversible cycle (F25B 3/00, F25B 5/00, F25B 6/00, F25B 7/00, F25B 9/00 take precedence)
Definition statement

This place covers:

Compression machines, plant, or systems with non-reversible cycle

Special rules of classification
with compressor of rotary type ({F25B 1/005,} F25B 1/10 take precedence)
Special rules of classification

F25B 1/005, F25B 1/10 take precedence.

with compressor of jet type, e.g. using liquid under pressure ({F25B 1/005,} F25B 1/10 take precedence)
Definition statement

This place covers:

Ejectors operating as compressor.

References
Limiting references

This place does not cover:

Ejectors used as expansion device

F25B 41/00

Special rules of classification

F25B 1/005, F25B 1/10 take precedence.

Compression machines, plant, or systems, with several evaporator circuits, e.g. for varying refrigerating capacity (with cascade operation F25B 7/00)
References
Limiting references

This place does not cover:

With cascade operation

F25B 7/00

Compression machines, plant, or systems with reversible cycle

F25B 13/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Multi-stage operation

F25B 1/10

Special rules of classification

The refrigerant flow determines if the evaporators are in series or in parallel, not the air flow.

F25B 5/00 classification of documents having parallel and series evaporators combined in one embodiment.

F25B 5/02 classification of documents having only evaporators in parallel in one document.

F25B 5/04 classification of documents having only evaporators in series in one document.

Documents combining embodiments with only evaporators in parallel with embodiments with only evaporators in series should be classified in F25B 5/02 and F25B 5/04/CCA or F25B 5/04 and F25B 5/02/CCA.

Evaporators exchanging heat at different pressure levels are additionally classified in F25B 1/10/CCA.

Compression machines, plant, or systems, with several condenser circuits
References
Limiting references

This place does not cover:

Compression machines, plant, or systems with reversible cycle

F25B 13/00

Special rules of classification

The refrigerant flow determines if the condensers are in series or in parallel, not the air flow.

F25B 6/00 classification of documents having parallel and series condensers combined in one embodiment.

F25B 6/02 classification of documents having only condensers in parallel in one document.

F25B 6/04 classification of documents having only condensers in series in one document.

Documents combining embodiments with only condensers in parallel with embodiments with only condensers in series should be classified in F25B 6/02 and F25B 6/04/CCA or F25B 6/04 and F25B 6/02/CCA.

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 (F25B 9/00 takes precedence)
References
Limiting references

This place does not cover:

Primary and secondary systems

F25B 25/005

Special rules of classification

F25B 9/00 takes precedence.

Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Refrigerants

C09K 5/00

Arrangement or mounting of refrigeration units with respect to device

F25D 19/00

Thermal coupling structure or interface

F25D 19/006

{the refrigerant containing more than one component (F25B 9/004 takes precedence; refrigerant materials per se C09K 5/00)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Special arrangements or features of compression machines, plant or systems characterised by the refrigerant being carbon dioxide

F25B 2309/06

Special arrangements or features of compression machines, plant or systems characterised by the refrigerant being carbon dioxide with the cycle highest pressure above the supercritical pressure

F25B 2309/061

Special rules of classification

Special arrangements or features of compression machines, plant or systems characterised by the refrigerant being carbon dioxide are additionally classified in F25B 2309/06 and F25B 2309/061 when the cycle highest pressure is above the supercritical pressure.

using expanders (F25B 9/10 takes precedence)
Special rules of classification

F25B 9/10 takes precedence, however in case of multi-stage expander classify also in F25B 9/06/CCA. Only gas cycle and CO2 expanders are classified in F25B 9/06, other expanders are classified in F25B 11/02 or in F25B 2400/14

using ejectors (F25B 9/10 takes precedence)
Special rules of classification

F25B 9/10 takes precedence, however in case of multi-stage ejector classify also in F25B 9/06/CCA.

characterised by the cycle used, e.g. Stirling cycle {(engine plants with Vuilleumier-type cycles F02G 1/0445)}
References
Limiting references

This place does not cover:

Stirling motors

F02G 1/043

Engine plants with Vuilleumier-type cycles

F02G 1/0445

Informative references

Attention is drawn to the following places, which may be of interest for search:

Special arrangements or features of Ericsson cycles

F25B 2309/1401

Control of a Stirling refrigeration machine

F25B 2309/1428

Special rules of classification

Special arrangements or features of Ericsson cycles are additionally classified in F25B 2309/1401.

Control of Stirling refrigeration machines is classified in F25B 2309/1428.

{pulse-tube cycle}
References
Limiting references

This place does not cover:

Thermoacoustic engines

F03G 7/002

Informative references

Attention is drawn to the following places, which may be of interest for search:

Special arrangements or features of pulse-tube cycles

F25B 2309/1402

Special rules of classification

Special arrangements or features of pulse -tube cycles are additionally classified in F25B 2309/1402 and lower.

Compression machines, plant, or systems, using turbines, e.g. gas turbines
Definition statement

This place covers:

Compression machines, plant, or systems, using turbines, e.g. gas turbines.

Special rules of classification

With CO2 as refrigerant classify in F25B 9/06.

Compression machines, plant or systems with reversible cycle (defrosting cycles F25B 47/02)
Definition statement

This place covers:

Compression machines, plant, or systems with reversible cycle: both condenser and evaporator change function when reversing the reversing valve.

References
Limiting references

This place does not cover:

Defrosting cycles:

F25B 47/02

Informative references

Attention is drawn to the following places, which may be of interest for search:

Special arrangements or features of compression machines, plant, or systems with reversible cycle not otherwise provided for

F25B 2313/00

Special rules of classification

Special arrangements or features of compression machines, plant, or systems with reversible cycle not otherwise provided for are additionally classified in F25B 2313/00.

Sorption machines, plant, or systems, operating continuously, e.g. absorption type
Definition statement

This place covers:

Sorption machines, plant, or systems, operating continuously, e.g. absorption type. A refrigeration system in which the process is as follows:

vaporization of the refrigerant; absorption of the vapour by an absorbing liquid; extraction of the refrigerant vapour by heating this liquid; condensation of the refrigerant; expansion of the refrigerant.

References
Limiting references

This place does not cover:

Sorption machines, plant, or systems, operating intermittently

F25B 17/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Boilers, Analysers, Rectifiers

F25B 33/00

Boiler-absorbers, i.e. boilers usable for absorption or adsorption

F25B 35/00

Absorbers, Adsorbers

F25B 37/00

Special arrangements or features of sorption refrigeration cycles

F25B 2315/00

Special rules of classification

Special arrangements or features of sorption refrigeration cycles are additionally classified in F25B 2315/00.

Definition statement

This place covers:

Absorption systems which, in addition to refrigerant and absorbent, also employs an inert medium (such as hydrogen) in order to balance pressure in the various parts of the refrigerating circuit

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Special arrangements or features of inert heat-exchangers

F25B 2315/004

Special rules of classification

Special arrangements or features of inert heat-exchangersare additionally classified in F25B 2315/004.

Sorption machines, plant, or systems, operating intermittently, e.g. absorption or adsorption type
Definition statement

This place covers:

Sorption machines, plant, or systems with alternating periods of vaporization and condensation.

References
Limiting references

This place does not cover:

Sorption machines, plant, or systems, operating continuously

F25B 15/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Boilers, analysers, rectifiers

F25B 33/00

Boiler-absorbers, i.e. usable for absorption or adsorption

F25B 35/00

Absorbers, Adsorbers

F25B 37/00

Special arrangements or features of sorption refrigeration cycles

F25B 2315/00

Machines, plant, or systems, using evaporation of a refrigerant but without recovery of the vapour
Special rules of classification

Devices using liquefied gases were historically classified in F25D 3/10.

Only to be classified in F25D 3/10 in case of a cold room.

Machines, plant, or systems, using electric or magnetic effects {(magnetic refrigerating material H01F 1/012 and H01F 1/017)}
Definition statement

This place covers:

Machines, plant, or systems, using electric or magnetic effects.

References
Limiting references

This place does not cover:

Magnets, Selection of materials for their magnetic properties

H01F

Informative references

Attention is drawn to the following places, which may be of interest for search:

Details of machines, plants, or systems using electro-caloric effects

F25B 2321/001

Details of machines, plants, or systems using magneto-caloric effects

F25B 2321/002

Details of machines, plants, or systems using thermionic electron cooling effects

F25B 2321/003

Special rules of classification

Additional classification of details of machines, plants, or systems using

electro-caloric effects in F25B 2321/001;

magneto-caloric effects in F25B 2321/002;

thermionic electron cooling effects in F25B 2321/003

using Peltier effect; using Nernst-Ettinghausen effect (thermoelectric elements H01L 35/00, H01L 37/00)
References
Limiting references

This place does not cover:

Peltier energy production

H01L 35/00

Thermo-electric elements

H01L 35/00, H01L 37/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Details of machines, plants, or systems using Peltier effects

F25B 2321/02

Semiconductor devices

H01L

{using selective radiation effect}
Definition statement

This place covers:

Cooling by radiation to the night sky, e.g. by selective coating on a (night sky) radiator.

{boiling cooling systems}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Heat-exchange apparatus in which the medium condenses and evaporates, e.g. heat pipes

F28D 15/02

Machines, plant, or systems, using a combination of modes of operation covered by two or more of the groups F25B 1/00 - F25B 23/00 (combinations of two or more modes of operation covered by a single main group, see the relevant group)
Definition statement

This place covers:

Machines, plant, or systems, using a combination of modes of operation covered by two or more of the groups F25B 1/00 - F25B 23/00.

Special rules of classification

Combinations of two or more modes of operation covered by a single main group, see the relevant group.

{using primary and secondary systems}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Pump speed control

F25B 2600/13

Arrangements for circulating liquids

F25D 17/02

Special rules of classification

Classification in F25B 25/005 when focus is on primary side of refrigeration cycle. However classification in F25D 17/02 when focus is on secondary side of the refrigeration cycle.

Machines, plant, or systems, using particular sources of energy (F25B 30/06 takes precedence)
Definition statement

This place covers:

Machines, plant, or systems, using particular sources of energy should be read as driven by particular sources of energy.

References
Limiting references

This place does not cover:

Use of solar heat

F24S 20/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Refrigeration system using an engine for driving a compressor

F25B 2327/00

Special rules of classification

F25B 30/06 takes precedence.

Refrigeration system using an engine for driving a compressor are additionally classified in F25B 2327/00.

Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
Definition statement

This place covers:

Combined heating and refrigeration systems, e.g. operating alternately or simultaneously should be read as operating simultaneously.

Special rules of classification

Only classify in F25B 29/00 when cooling and heating is used simultaneously.

F25B 13/00 takes precedence.

Heat pumps
Definition statement

This place covers:

Refrigeration systems employed for heating, by using the heat given off by the condenser.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Water-cooled condensers

F25B 2339/047

Central heating systems using heat pumps

F24D 11/02

Special rules of classification

When classifying heat pump circuits or systems, groups F25B 1/00 - F25B 25/00 and F25B 29/00 take precedence over group F25B 30/00. Classification in F25B 30/00 when heat of condenser is used for a specific purpose, e.g. hot tap water.

Compressor arrangements (compressors per se F04)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Machines or engines in general

F01M

Compressors (lubrication of)

F04

Cooling of compressors

F04B 39/06

Cooling of compressors by injecting a liquid in the gas to be compressed

F04B 39/062

Boilers; Analysers; Rectifiers (boiler-absorbers F25B 35/00)
Definition statement

This place covers:

Boilers/generators: that part of an absorption machine in which the refrigerant vapour is driven off by heat.

Analysers: a small fractionating column, in an absorption machine between generator and rectifier or condenser.

Rectifiers: that part of an absorption machine in which entrained absorbent is removed from the refrigerant vapour before condensation.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Boilers, Analysers, Rectifiers

F25B 35/00

Special arrangements of details of boilers; Analysers; Rectifiers

F25B 2333/00

Boiler-absorbers, i.e. boilers usable for absorption or adsorption
Definition statement

This place covers:

Boiler-absorbers, i.e. boilers usable for absorption or adsorption

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Sorption machines, plant, or systems, operating continuously, e.g. absorption type

F25B 15/00

Sorption machines, plant, or systems, operating intermittently, e.g. absorption or adsorption type

F25B 17/00

Absorbers; Adsorbers (boiler-absorbers F25B 35/00; separating processes involving the treatment of liquids with adsorbents B01D 15/00; separation of gases or vapours by adsorption B01D 53/02; separation of gases or vapours by absorption B01D 53/14; investigating using adsorption or absorption G01N 30/00); {(absorption or adsorption in general B01J 20/00)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Boiler-adsorbers

F25B 35/00

Separating processes involving the treatment of liquids with adsorbents

B01D 15/00

Separation of gases or vapours by adsorption

B01D 53/02

Separation of gases or vapours by absorption

B01D 53/14

Liquid distributor absorbing units

B01D 53/18

Absorption or adsorption in general

B01J1/22

Investigating using adsorption or absorption

G01N 30/00

Evaporators; Condensers
Definition statement

This place covers:

Evaporators: heat exchangers in which liquid refrigerant is vaporized to produce refrigeration;

Condensers: heat exchangers in which refrigerant vapour is liquefied by removal of heat.

References
Limiting references

This place does not cover:

CO2 radiators/gas coolers

F28

Informative references

Attention is drawn to the following places, which may be of interest for search:

Special arrangements or details of evaporators

F25B 2339/02

Special arrangements or details of condensers

F25B 2339/04

Heat-exchange apparatus not provided for in another subclass

F28D

Details of heat-exchange or heat-transfer apparatus of general application

F28F

Elements constructed in the shape of a hollow panel, e.g. with channels

F28F 3/12

Special rules of classification

Classification in F25B 39/00 when both evaporator and condenser are claimed.

When a heat exchanger, e.g. evaporator is claimed, classify in F25B 39/00 and F25B 39/02/CCA.

When a heat exchanger, e.g. condenser is claimed classify in F25B 39/00 and F25B 39/04/CCA.

Special arrangements or details of evaporators are additionally classified in F25B 2339/02.

Special arrangements or details of condensers are additionally classified in F25B 2339/04.

Subcoolers, desuperheaters or superheaters
Definition statement

This place covers:

Subcoolers: Heat exchangers, after the condenser, for subcooling the condensed refrigerant. Sometimes also called supercooler.

Desuperheaters: Heat exchangers, preceding the condenser for removing all or part of the superheat.

Superheaters: Heat exchanger in which wet vapour leaving an evaporator is dried and superheated.

Special rules of classification

When heat-exchanger is a combination of heat-exchangers of sub-groups F25B 40/02, F25B 40/04 or F25B 40/06 classify in F25B 40/00 and two out of three of F25B 40/02/CCA, F25B 40/04/CCA or F25B 40/06/CCA.

Fluid-circulation arrangements, e.g. for transferring liquid from evaporator to boiler (pumps per se, sealings therefor F04)
Definition statement

This place covers:

Fluid-circulation arrangements, e.g. for transferring liquid from evaporator to boiler.

Ejector refrigeration cycle with the ejector used as expansion device.

Free or natural cooling.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Special arrangements or details of ejectors not being used as compression device

F25B 2341/001

Pumps, sealings therefor

F04

Valves

F16K

Regulating valves

G05D

Special rules of classification

Ejectors used as expansion device are classified in F25B 41/00 and F25B 2341/001

Ejectors operating as compressor are classified in F25B 1/06 or F25B 1/08.

A compression cycle with natural or free cooling mode is classified in F25B 41/00 in combination with F25B 2400/0401 and F25B 2400/0411.

{fluid line arrangements}
Definition statement

This place covers:

Pipe structures: connections, fittings, joints.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Arrangements for charging or discharging refrigerant

F25B 45/00

Pipes; Joints or fittings for pipes; supports for pipes cables or protective tubing; Means for thermal insulation in general

F16L

{Expansion valves (regulating valves per se G05D)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Special arrangements or details of flow restrictors or expansion valves

F25B 2341/06

Control of expansion valves

F25B 2600/2513

Special rules of classification

Additionally classify special arrangements or details of flow restrictors or expansion valves in F25B 2341/06.

Additional classification of control of expansion valves in F25B 2600/2513.

Regulating valves per se G05D.

{capillary tubes}
Definition statement

This place covers:

Flow restrictor with fixed opening.

Arrangements for separating or purifying gases or liquids (in analysers or rectifiers F25B 33/00); Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat (F25B 40/00 takes precedence)
Definition statement

This place covers:

Arrangements for separating or purifying gases or liquids

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Arrangements for separating or purifying gases or liquids in analysers or rectifiers

F25B 33/00

Special rules of classification

F25B 40/00 takes precedence.

{filters (in general B01D)}
Definition statement

This place covers:

Filters and/or driers.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Filters in general

B01D

{accumulators}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Suction acumulators with deflectors

F25B 2400/03

Receivers

F25B 2400/16

Special rules of classification

Additonal classification of high pressure receivers in F25B 2400/16.

Arrangements for charging or discharging refrigerant
Definition statement

This place covers:

Charging/discharging of refrigerant to/from a cycle from an external source.

Balancing of refrigerant within a cycle.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Details for charging or discharging refrigerants; Service stations therefor

F25B 2345/00

Means for monitoring, testing or servicing the air-conditioning of vehicles

B60H 1/00585

Special rules of classification

Details for charging or discharging refrigerants and details of service stations are additionally classified in F25B 2345/00 and lower.

{for preventing frost}
Definition statement

This place covers:

Preventing frost/condensation.

Defrosting cycles
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Alternate defrosting

F25B 2347/021

Special rules of classification

Classification in F25B 47/02 when heat for defrosting is extracted from refrigerating cycle itself, otherwise classify in F25D 21/00. Details of defrosting cycles are additionally classified in F25B 2347/02 and lower.

Arrangement or mounting of control or safety devices (testing refrigerators G01M; control in general G05)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Compressor control in general

F04B

Testing refrigerators

G01M

Control in general

G05

Motors

H02K

{of safety devices (F25B 49/02 and F25B 49/04 take precedence)}
Definition statement

This place covers:

Also classification of monitoring devices.

Special rules of classification

F25B 49/02 and F25B 49/04 take precedence.

for compression type machines, plant or systems
References
Limiting references

This place does not cover:

Control of multiple evaporators

F25B 5/00

High pressure supercritical control the refrigerant being carbon dioxide

F25B 9/008

Control of expansion valve only

F25B 41/062

Defrost control

F25B 47/02, F25D 21/00

Control of air-conditioning reheater

F24F 3/153

Informative references

Attention is drawn to the following places, which may be of interest for search:

Control of expansion valves

F25B 2600/2513

Sensing or detecting of parameters; Sensors therefor

F25B 2700/00

Compressor control in general

F04B

Testing refrigerators

G01M

Control in general

G05

Motors

H02K

{Compressor control arrangements (in general F04B)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Compressor control

F25B 2600/02

Sensing or detecting of parameters; Sensors therefor

F25B 2700/00

Special rules of classification

Details of compressor control are additionally classified in F25B 2600/02.

Details of sensing or detecting of parameters and sensors therefor are additionally classified in F25B 2700/00.

{Motor control arrangements (motors per se H02K)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Compressor control inverters therefor

F25B 2600/021

Sensing or detecting of parameters; Sensors therefor

F25B 2700/00

Special rules of classification

Details of inverter compressor control are additionally classified in F25B 2600/02.

Details of sensing or detecting of parameters and sensors therefor are additionally classified in F25B 2700/00.

{Condenser control arrangements}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Fan speed control of condenser fans

F25B 2600/111

Sensing or detecting of parameters; Sensors therefor

F25B 2700/00

Special rules of classification

Details of fan speed control of condenser fans are additionally classified in F25B 2600/02.

Details of sensing or detecting of parameters and sensors therefor are additionally classified in F25B 2700/00.