HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR

Introduced: September 1968

Description

F02G covers positive-displacement engines powered by hot gases or combustion products, including Stirling engines, Ericsson engines, and related thermodynamic cycles that operate by expanding heated working fluids rather than traditional combustion-driven piston mechanisms. This subclass also encompasses systems for capturing and utilizing waste heat from combustion engines where such applications are not specifically covered elsewhere in the classification scheme. Technologies include heat exchangers, regenerators, and energy recovery systems integrated with engine plants. Adjacent classes F02B–F02F address conventional internal combustion engines, while F02G specifically focuses on alternative thermal cycles and waste-heat utilization not classified in specialized engine or heating sections.

Title

Titles differ between systems:

IPC: HOT-GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES, NOT OTHERWISE PROVIDED FOR

CPC: HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR

Full Title

Full titles differ between systems:

IPC:

HOT-GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES, NOT OTHERWISE PROVIDED FOR

CPC:

HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR

CPC subdivides this area 6x more granularly than IPC with 16 additional codes.

16 codes are CPC-only extensions.

Note: 16 CPC extensions are marked as secondary classification only.

Child Classifications

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F02G 1/00 Hot gas positive-displacement engine plants IPC+CPC Available in IPC and CPC
F02G 2242/00 Ericsson-type engines having open regenerative cycles controlled by valves 2nd only +2 CPC CPC only CPC only
F02G 2243/00 Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes 2nd only +2 CPC CPC only CPC only
F02G 2244/00 Machines having two pistons 2nd only +2 CPC CPC only CPC only
F02G 2250/00 Special cycles or special engines 2nd only +10 CPC CPC only CPC only
F02G 2253/00 Seals 2nd only +10 CPC CPC only CPC only
F02G 2254/00 Heat inputs 2nd only +13 CPC CPC only CPC only
F02G 2255/00 Heater tubes 2nd only +2 CPC CPC only CPC only
F02G 2256/00 Coolers 2nd only +3 CPC CPC only CPC only
F02G 2257/00 Regenerators 2nd only +1 CPC CPC only CPC only
F02G 2258/00 Materials used 2nd only +5 CPC CPC only CPC only
F02G 2260/00 Recuperating heat from exhaust gases of combustion engines and heat from cooling circuits 2nd only CPC only CPC only
F02G 2262/00 Recuperating heat from exhaust gases of combustion engines and heat from lubrication circuits 2nd only CPC only CPC only
F02G 2270/00 Constructional features 2nd only +18 CPC CPC only CPC only
F02G 2275/00 Controls 2nd only +4 CPC CPC only CPC only
F02G 2280/00 Output delivery 2nd only +6 CPC CPC only CPC only
F02G 2290/00 Engines characterised by the use of a particular power transfer medium, e.g. Helium 2nd only CPC only CPC only
F02G 3/00 Combustion-product positive-displacement engine plants IPC+CPC Available in IPC and CPC
F02G 5/00 Profiting from waste heat of combustion engines, not otherwise provided for IPC+CPC Available in IPC and CPC