NPCF Week 16 (4/15-4/21)
- Chilled water issues
- per Luke, preliminary data shows the issues with chilled water is directly related to the XDP refrigerant temperature set point changes that was made recently not clogged stariners
- Also early in the season, changes to the chilled water differential pressure set point change (dropped from 30 to 25) may have contributed.
- The above 2 cause the XDP valve to operate at higher opening to maintain refrigerant temperature during transition.
- Operating at higher valve popping is good not bad thing
- But the nuisance alarms have be addressed
- Tower water treatment controller is up and running, it required to stop tower operation for 2 days.
- All water treatment now under control
- Reports of Weekly and monthly water treatment will be be generated.
NPCF Week 14 (4/1-4/7)
- Tower switched multiple time over the weekend, received complaints from Cray team.
- Assisted Blue Waters senior design team on their project.
- At the request of Cray personnels investigated causes of chilled water spikes and low flows (strainers issues)
- Switched all XDPs chilled water strainers to standby ones and F&S are cleaning all the ones that were in service.
NPCF Week 13 (3/25-3/31)
- Added AHU 2 on line
- Planing mForge cage procurement
- Planing for cage physical security requirement
NPCF Week 12 (3/18-324)
- Water treatment sample was sent to NALCO for the tower and heating loop weekly analysis .
- New Naclo water treatment controller was ordered.
- F&S-Fabricating rack blanking panel.
- Cooling Tower testing for higher temperature:
- Increase the tower control temperature from 50 to 52
- Added the forth chilled water pumps to reduce pumps power
- The result was not favorable, as the the temperature of the chilled water increased the demand by the XDP for flow increased so much the pumps could not maintain the required differential pressure.
- Reversed the changes to the origenal setting of 50 deg supply chilled water temp
- Change the towers control point to 45 (50-5) to increase towers utilization and to reduce the import of chilled water from campus, this worked well.
NPCF Week 11 (3/11-3/17)
- Two hard drives failed on the security system (DVR-B)
- Continued to measure cold aisle temperature in the i/m fiorge.
- Air supply temperatures is between 50 to 70 depending on the location and mixing with hot air.
- Temperature at the top of rack around 74 degree.
- Need to fill all racks empty spaces with blanking panels.
- Also considering a cold aisle containment for I/m forge aisle.