Michael Feeney Liquid Cooling

mfeeney@astro.caltech.edu

How to keep surface temperature of Archon and ZTF electronics rack within 1K of ambient to minimize seeing degradation. Flow circuit diagram, non-linearities. Heat exchangers. How much insulation? Optimal routing of air flow inside cabinet. Sizing of plumbing and effect on cable wraps.

Date: Wednesday, July 26, 2017
Time: 12:30 pm PST
Location: Caltech, Cahill 126

Communications:

Web Based Conferencing https://zoom.us/j/845192587
Meeting ID 845 192 587
Phone to Zoom +1 646 558-8656
+1 408 638-0968
Direct to Cahill 273 +1 626 395-8646
+1 626 395-8884

Questions or comments:

  • Anyone may contribute here.... Click "edit" button above-right or below
  • Joe Tufts: beware of resistances in couplings; Feeney will add these to model and re-compute pressures and flows.
  • Joe and Greg: because Archon enclosure is highly conductive, and connected to the heat sink then insulating the walls wont have much effect.
  • Roger: acknowledged. We'll review when we have thermal images. There are several work arounds: 1) bias the supply temperature to the low side assuming we gate some dT across the walls of the hoses so they still meet the 1C requirement. 2) relax the requirement off we are very close to the 1C limit! 3) place some insulation between heat exchanger and Arcon enclosure walls (nylon washers). etc. ... or 4) in the case that the temperature rise is much worse than projected, place an insulative cover over the Archons.
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Topic revision: r5 - 2017-07-27 - RogerSmith
 
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