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ESLI new proposal

ESLI new proposal. Questions generated after their new proposal radial fintubes Dog-leg Manifold Development and production cost CM’s design. ESLI ppt file. Long discussion last Thursday and again on Friday A lot of the discussion was on CM’s design

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ESLI new proposal

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  1. ESLI new proposal • Questions generated after their new proposal • radial fintubes • Dog-leg • Manifold • Development and production cost • CM’s design

  2. ESLI ppt file • Long discussion last Thursday and again on Friday • A lot of the discussion was on CM’s 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. CM’s 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 higher;too 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; what’s 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?

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