Ghidersa, Bradut-Eugen

Hering, Wolfgang

Starflinger, Jörg

Stieglitz, Robert

Wen, Wen

English

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KIT – The Research University in the Helmholtz AssociationDEMO-Divertor Concept• Divertor target made out of parallel cylindrical Heat Pipes(HPs) installed in a water cooling channel. The Heat Pipe rods form a staggered structure (HP condenser). • The Heat Pipes penetrate the plasma facing side of the cooling channel, having a hexagon W-armor at that particular end (HP evaporator side). • Orientation 7.8º (depends on divertor target). • HP has cylindrical body with 15mm outside diameter, while the vapor space is 12mm in diameter;• HP material: CuCrZr• HP total length is 230mm, the length of the evaporator and adiabatic part being 7mm and, respectively 23mm. • Combined wick structure: sintered porous--- evaporatorgrooves --- adiabatic zone and condenserExperimental heat transfer performance evaluationCapillary limit well above the operating power. Critical boiling limit:→ Focus on the performances of sintered porous structure of evaporator under high heat flux conditions.➢ Experimental mock-up• Reproduce the evaporator level as the same as in HP for DEMO• Condenser with jet impingement cooling (high HTC)• Evaporator below condenser – increase capillary limit• Material: CuCrZr for mock-up body; Bronze for sintered porous• 9 thermal couples on mock-up: • Same wick area as in HP for DEMO• 2 porous structures for 2 mock-ups : - one normal sintered porous- one sintered porous with grooves➢ Method• 2 mock-ups test : one normal sintered porous as comparisonone sintered porous with grooves as optimize model• Input power from 1MW/m2up to 20MW/m2or when there are indications of burn-up• Screening study on HP water inventory➢ Futures works• Validation the experiment and investigate the evaporator performance with mock-ups with 2 different sintered porous structures.• Find the boiling limit of these 2 porous and make a comparation.• Apply and verify the better sintered porous structure on the DEMO HPDivertor Plasma Facing Component concept for European DEMO based on Heat Pipe technology  Wen Wena, Bradut-Eugen Ghidersaa, Hering Wolfganga, Jörg Starflingerb, Robert StieglitzaObjectivesInvestigate the possibility of using water-based heat pipes in conjunction with a new divertor target concept including:• dimensioning a variable conductance heat pipe that should be capable of dealing with heat fluxes as high as (at least) 20MW/m2• evaluating experimentally its heat transfer performancesConclusions• Solution: Preliminary engineering study indicates that a water based heat pipe 230mm long made out of CuCrZr, from which the condenser should be at least 200mm long, should be capable  for peak heat flux of 20MW/m2. • Verifying test : Before going to have a target mock-up, the boiling limit characterizing the operation of the evaporator of an individual HP is assessed experimentally.Individual Heat Pipea: Institute for Neutron Physics and Reactor Technology, Karlsruhe Institute of Technology , Karlsruhe, Germanyb: Institute of Nuclear Technology and Energy Systems , University of Stuttgart, Stuttgart, GermanyInstitute for Neutron Physics and Reactor Technology (INR) Karlsruhe Institute of Technology (KIT), Campus NordHermann-von-Helmholtz-Platz 176344 Eggenstein-Leopoldschafen, Germanyhttp://www.inr.kit.edu/W-armor  HP Evaporator end with porousHeat pipes arrangement (cooling channel side)Condenser: groovesEvaporator: Sintered Porous structureFlow Direction3 TEs : 5mm under the condenser surface2 TEs : in FHP body for vapor temperature 4 TEs : evaporator surfaceDivertor cassette assembly with a Heat Pipe-based targetSintered porous structure: normal shape; with groovesDemo Heat Pipe evaporator and Experiment mock-up modelImpinging Jet coolant Experiment mock-up : outside and insideGroovesPorousTemperature Sensors  on  Experiment Mock-up

Divertor Plasma Facing Component concept for European DEMO based on Heat Pipe technology

https://publikationen.bibliothek.kit.edu/1000141438/136991459

Divertor Plasma Facing Component concept for European DEMO based on Heat Pipe technology

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