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1
Optimizing the Efficiency of the NCAR-Wyoming Supercomputing Center
Ademola Olarinde
Team Member: Theophile Nsengimana
Mentor: Aaron Andersen
August 1, 2014
2
Background
• Project Goal:
Optimize NWSC energy sequence on subcomponent system basis
• NWSC houses high performance supercomputers for atmospheric and geoscience modeling across the nation
• Opened: October 15, 2012
3
Energy SubcomponentsTotal Facility Power
Building Load
Power Delivery
Switchgear, Transformers
UPS, generators, batteries
Electrical Losses
Mechanical Load
Fans & Pumps
Relief, Supply & Exhaust Fan
Heat Pump** & Water Pump
HVAC Equip
Cooling Tower, Chiller, Heater
AHU, Heat Exchanger & Compressor
CRAC’s & Boilers*
Misc. Equip
Fan Coil, Dryer & Humidifier
Softener & Coupon Rack
Admin and office load
IT Load
Yellowstone
Networking & System Monitoring
IT UPS
Telecom
Data Storage
4
NWSC Energy UsageInvestigated systems include:• Condenser Water System• Side Stream Filter System• Heating System• Cooling Towers• Air Handlers• UPS firmware upgrade effect
June 2012 - May 2013
June 2013 - May 2014
1.10 1.20 1.30
1.25
1.20
NWSC ANNUAL PUE
PUE
Performance Usage Effectiveness (PUE)
= Total Facility Energy/IT Equipment Energy
1.0 ≤ PUE ≤ ∞
Remote Inspection Feature
5
Hydronic Evaporative System
• 650F Efficient Water CirculationUtilizes 450 bends; Oversized Piping Network; and Smaller Pumps
• Cooling TowerHighly efficient tower consuming less at 300F wet-bulb temp
• Chiller Back-up cooling alternative at high relative humidity conditions
• Building Automation SystemWater System; Electrical Management; Air Management
CWS
CWR
CWR – Chilled Water ReturnCWS – Chilled Water Supply
6
Cooling Towers (CT)
CT Units
CT-1 Annual PerformanceChart
7
Preferred Cooling System
• CT Power Consumption against Wet Bulb Temperature Chart
• 96 kW max CT combined consumption
• Preferred alternative to Chillers which runs at 200 kW per unit
• Condensing Water & Side Stream Filter System air infiltration
8
Condensing Water (CW) System
• Serves 65oF Chilled Water HX, 65oF & 45oF Chillers
• Comprises of 2 pumps
• Pump sequence
• Dec 28 air infiltration
• June air infiltration
Condenser Water Pump (CWP) power consumption chart
9
Side Stream Filter System
• Function: Removes dirt from Cooling Tower units
• Differential Pressure
Transmitter False Signal: Reading: 10 Psi to 1.5 Psi
• Trigger Point Design
• Control charts alarm system
10
Air Infiltration Problem & Solution• Air-water solution & air vaporization along flow
channel
• Inadequate net positive suction pressure
• Water vaporizes in pump impeller & at low pressure points
• Water Pressure dropping below vapor pressure at 65oF water temperature
• Current air removal approach:Flushing , Filling & Venting Backward built-pressure air removalIncrease CT basin height
• RecommendationInstall automatic air vent on identified traps upstreamIncrease suction head by reducing pump height
11
Conclusion• NWSC PUEL3,YC 4% improvement
• Evaporative cooling system and air infiltration solution challenge
• Future Work: Predictive maintenance improvement