ESLI new proposal

1
ESLI new proposal

• Questions generated after their new proposal
• radial fintubes
• Dog-leg
• Manifold
• Development and production cost
• CMs design

2
ESLI ppt file

• Long discussion last Thursday and again on Friday
• A lot of the discussion was on CMs design
• Did talk about manifold, radial fintubes, SOW,
  plan/schedule but not cost
• Dog-leg dropped for this year
• Review of design options added to proposal
  including fabrication of small sample
• CM will be working with Tim on the design options

3
Radial fintubing

• Heat transfer depends on contact of chips,
  conductivity through the core, interface to
  tubes.
• Excessive impedance with vertical fibers because
  many fibers missed the tubes
• Problem known but only solved recently
• Ideal arrangement tube diameter and separation
  the same possible with new technique

4
Manifold

• Weakest part in the old substrate
• Use epoxy and Al manifold
• New proposal uses POCO graphite tube which has
  submicron holes
• Coat with pyrocarbon CVD to seal holes
• Put in oven and carbonized the whole piece
  (integrated piece) technique used by General
  Atomics for Nuclear fuel pellets
• He leak test in each step
• Easy to attach Swagelock snap-on piece

5
Reinforcement Options

• Existing article has Carbon fabric wrap around
• Proposed to wrap around manifold if needed
• Start from carbon-fabric remove most of the
  fibers until only few in-plane fibers left
  transfer to the article

6
CMs proposal

• Use rectangular carbon tubes to improve thermal
  performance
• Use closely packed tubes to form a rigid plate
• Then stick this plate into the velvet structure
• Pros- simpler to fabricate, maybe lighter
• Cons- stiffness, needs stiffening features or
  make the velvet highertoo much material because
  of coolant
• On Friday, Tim was more enthusiastic. He had some
  other ideas such as ribs, H-beams on the edge
  etc.
• Plan review design options with CM whats the
  best solution wall thickness, size of tubes etc

7
New proposal v2

• Over the weekend, Tim worked more and sent me two
  revised ppt files
• He called me up this morning briefly discussed
  pg 8-9
• Dog-leg not included in the quote now 115K
  dog-leg estimated to cost 15K more
• What should we do next?