Difference between revisions of "Minutes-4-12-2012"
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- Due to the difficulties to maintain clean and flat surfaces needed for the Viton O-rings, we started looking again at the possibilities to use EPDM. We set up at Blue Crab a second oxygen testing place. There we started with the simplest configuration: spacer ring with EPDM O-rings between two Lexan plates: 220 ppm oxygen (to be compared to 400 ppm we measured before). As a next step, yesterday we added to the same configuration cathode type-1 with EPDM O-ring, expecting to have the final results tomorrow. | - Due to the difficulties to maintain clean and flat surfaces needed for the Viton O-rings, we started looking again at the possibilities to use EPDM. We set up at Blue Crab a second oxygen testing place. There we started with the simplest configuration: spacer ring with EPDM O-rings between two Lexan plates: 220 ppm oxygen (to be compared to 400 ppm we measured before). As a next step, yesterday we added to the same configuration cathode type-1 with EPDM O-ring, expecting to have the final results tomorrow. | ||
| − | - Even we had a factor of 3 improvement, we expect ~0.5% oxygen for the whole package at 220ccpm. We would need a factor of 5 higher flow to have the oxygen below 0.1% what we had in the prototype. Another way to reduce the effect of the oxygen is to use less CO2, either going to 90/10 gas mixture or using methane instead of (some part of) CO2. Eugene, Bill, Beni insisted that we don't want to be constrained by the gas and we should continue to fight for lower oxygen. Bill proposed to | + | - Even we had a factor of 3 improvement, we expect ~0.5% oxygen for the whole package at 220ccpm. We would need a factor of 5 higher flow to have the oxygen below 0.1% what we had in the prototype. Another way to reduce the effect of the oxygen is to use less CO2, either going to 90/10 gas mixture or using methane instead of (some part of) CO2. Eugene, Bill, Beni insisted that we don't want to be constrained by the gas and we should continue to fight for lower oxygen. Bill proposed to investigate the use of Apiezon (vacuum grease) on the O-rings. |
== Engineering == | == Engineering == | ||
Revision as of 18:10, 12 April 2012
April 12, 2012 FDC meeting
Agenda
- Production Construction Tracking (Dave)
- Production status
- Results from the oxygen studies (Lubomir)
- First production cell with Viton O-rings
- New tests with EPDM
- Engineering update (Bill)
- Frame deformations with new O-rings Ansys results,Ansys results
- Electronics update (Chris)
- Other
