1 Financing Innovation in Europe Brussels / December 16, 2005 Kim Kreilgaard.
December 16, 2005
description
Transcript of December 16, 2005
NCSX
December 16, 2005
NCSX Vacuum Vessel Heating and Cooling system R&D
P. Goranson, B. Nelson
Dec 16, 2005 2
NCSX
First VVSA is coming soon
• Current Status– 1st VVSA delivery by end of March
– Heating and cooling system design complete pending specification of heaters
– Thermal Insulation design nearly complete
– Structural support design complete, in fabrication at PPPL
– I&C design nearly complete
Dec 16, 2005 3
NCSX
Vacuum Vessel ancillaries defined
VV ancillaries include:
- flux loops- coolant tubes - thermocouples- headers- diagnostic feed through flanges- lateral supports- pumping/personnel access port- heater tapes
Dec 16, 2005 4
NCSX
Cooling tube design modified to aid fabrication
• Original design based on standard 5/16 o.d. stainless steel tubing, formed to CAD-derived geometry data (per vendor input)
• No bids received from vendors• New design uses corrugated stainless tubing with
braided reinforcement• Standard product, easy to install, but will it work?
1.25
1/16
5/16 STUD
.062
Gasket omitted for clarity
1.0
Ø.375
R 0.44
0.645
0.4 DIA
Configuration change for braided tubing
0.505
Cross section at typical clamp
Dec 16, 2005 5
NCSX
Loose fill provides better thermal insulation
• Original concept used microtherm bats– Required custom flat pattern designs
for each of 8 layers– Thickness limited to 2 inches to provide
clearance for field period assy
• New design uses loose fill of nanogel beads– Inexpensive– Better insulation ( 1/3 heat leak)– Current product not rated to 350C, but
expect this will be available soon – adequate alternative is perlite,
but will this system work?
•Aerogel felt
around mod coil
Dec 16, 2005 6
NCSX
We need to test integrated H/C system
Goals
1 H/C tube design verfication1.1 Heat transfer to and from tube1.1.1 temp vs time1.1.2 what is hc?1.2 Attachment method(s) for tube1.3 Routing of tube1.4 Operation/durability up to 350C
2 Heater tape design verification2.1 Control of port temperature during bakeout2.2 Attachment, routing of tape2.3 Operation/durability up to 350C
3 Magnetic Loops3.1 Interaction / compatibility with heater3.2 Operation/durability up to 350C
4 Insulation system4.1 simulate boot4.2 simulate loose fill insulation
• Goals
• Maybe we can do this on the Rohwedder PVVS
Dec 16, 2005 7
NCSX
How would we set up Rohwedder PVVS?
• Cut port region from Rohwedder PVVS
• Ship port region of Rohwedder PVVS to ORNL
• Procure cooling tube and associated mounting hardware
• Borrow one or more prototype magnetic loops from PPPL
• Procure two or more port heater tapes with associated controls
• Procure set of thermocouples and associated mounting blocks
• Attach cooling tubes, heater tapes, magnetic loops, thermocouples in prototypical manner
Dec 16, 2005 8
NCSX
How would we set up Rohwedder PVVS?
• Fabricate one boot assembly to fit PVVS port
• Fabricate mockup of mod coil port opening
• Mount mod coil port opening in bottom of container
• Mount PVVS with port down in container
• Fill space around PVVS segment with loose fill insulation
• Heat PVVS by separate heater tapes
Dec 16, 2005 9
NCSX
How would we use Rohwedder PVVS?
• Heat PVVS segment to 150C and:– Demonstrate control of port temperature
with heater tape(s) on port extension– Check effectiveness of bead insulation
• Turn off heaters and check cooldown via flexible cooling lines
– Determine temperature gradient between tubes
– Determine heat transfer coefficient
• Repeat at various temperatures up to 350C
• Dismantle and inspect all parts for damage, degradation
Dec 16, 2005 10
NCSX
How much would this cost?
Dec 16, 2005 11
NCSXSummary