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Energy efficiency case study: CLP’s internal primary data centre
André Blumberg Director IT
25 Sep 2013
1972
CLP Data Centre Milestones
2010 2002
2011
2013
2007
First commercial computer First
IBM 370-145 mainframe
Hot/Cold aisle adoption Blade system
adoption Tapeless backup solution
Water mist system for chiller unit
High Energy Efficiency (HEE) zone
1963
1.60
1.80
2.00
2.20
2008 2009 2010 2011 2012 2013(1H) 2014 (Forecast)
2.14 2.03
1.97 1.97
1.86 1.80
1.70
PUE
Year
PUE Trend of CLP’s Primary Data Centre
• Climate is a major factor of PUE
• Annual energy consumption (kWh) of PUE calculation is recommended
13%
Monthly energy consumption
Up to
14% Up to
30% Up to
Water mist system for chiller unit
Raise intake temperature
High Energy Efficiency Zone
1.75
1.92
2.08 2.06
1.92
1.76
1.70
1.90
2.10
Feb Apr Jun Aug Oct Dec
PUE
Month
Monthly PUE of Data Centre in HK (Sample)
13%
Operation Best Practices
Up to
Energy Efficiency Measures
• Operate mainly in summer, 2-level trigger point (i.e. 27°C and 29°C)
• Increase Coefficient of Performance (COP)
• Raise temperature from 25°C to 29°C, 1°C every month from March to June 2013
• Decrease cooling load
2.19 2.14 2.10 2.00
1.89 1.79
2.04 1.97
1.89 1.83 1.79
1.71
1.50
1.70
1.90
2.10
2.30
Jul Aug Sep Oct Nov Dec
PUE
Month
Water Mist System for Chiller Unit 2012
1.75 1.75 1.8
1.92 1.99
2.08
1.50
1.70
1.90
2.10
Jan Feb Mar Apr May Jun
PUE
Month
Raise Intake Temperature 2013
1.72 1.72 1.78 1.83 1.86 1.88
2010 & 2011 2012 2011 & 2012 2013
25°C 26°C 27°C 28°C 29°C
Cold Aisle Containment
High Energy Efficiency Zone
Server Racks
Separation of cold intake and hot exhaust air
Containment
High Energy Efficiency Zone
Free Cooling To bring outside ambient air to cool down IT equipment and exhaust the hot air Bring Outside
Ambient Air
Free Cooling Air Duct Free Cooling CRAC
Exhaust the Hot Air to Outside
High Energy Efficiency Zone
CRAC When free cooling is not favourable, traditional CRAC is used for equipment cooling
CRAC
High Energy Efficiency Zone
In-row Cooling Unit An efficient solution to resolve hot spot problems
In-row In-row
High Energy Efficiency Zone
Smart Lighting System An energy efficient solution for non-peak hours
In-row In-row
CRAC Containment
Server Racks Free Cooling CRAC
Free Cooling Air Duct
In-row In-row
CRAC Containment
Server Racks Free Cooling CRAC
Free Cooling Air Duct
ASHRAE Technical Committee 9.9 (TC9.9) recommendation: • Temperature: 18 – 27oC • Relative humidity: 20% – 80%
Indoor Conditions Enthalpy Control Temp (oC) RH (%) Free Cooling (days)
24 80 153 25 80 170 26 80 180 27 80 193 28 80 210 29 80 241
Recommendation: Adjust the intake air temperature close to the highest acceptable value of equipment
CLP proactively adjusts intake air temperature and relative humidity: • Temperature: from 25oC to 29oC • Relative humidity: from 30 – 70% to 20 – 80%
Does Free Cooling Work in Hong Kong
Remarks: The estimated number of free cooling service days is based on the temperature and relative humidity statistics of 1991 to 2010 from HK Observatory.
EnergyNet for Data Centre
Key Performance Index includes critical factors of PUE measurement, i.e. intake air temperature, the efficiency of both
facility systems and IT systems
EnergyNet is a mobile application for energy efficiency monitoring and reporting to identify opportunities for continuous improvement.
Server Average (with overhead)
Server Average (without overhead)
Energy Efficiency Best Practice Knowledge Centre
• Energy Efficiency Best Practice on CLP Online website including : https://www.clponline.com.hk/dceebp
• HVAC Improvement • Environment and Airflow Management • Space Management • IT Opportunities • Other Opportunities
• Email your enquiry to our dedicated team [email protected]