IBM Symposium Data Center Cooling. EC Systems for HVAC architecture and Direct air Cabinet Cooling

Transcription

1 IBM Symposium 2008 Data Center Cooling EC Systems for HVAC architecture and Direct air Cabinet Cooling Presented by David J. Spofford Product Manager IT/Telecomm 1

2 Agenda Data Center trends for IT and Cooling What is EC? EC Systems Basics Why is EC better? Applications for EC product? Examples of EC in a data center

3 EC Basics EC Motor With Integrated Electronic What is an EC motor? It is a brushless, permanent magnet, synchronous motor with electronic commutation but we just name it E C LECTRONICALLY OMMUTATED motor or EC motor

4 EC Systems with External Rotor Motor The heart of ebmpapst designs for Data Center application rotor permanent magnet lamination stack Hall-effect sensor bearing system commutation electronics winding

5 What are EC Systems E.C = Electronically Commutated motors E.C Systems include: Brushless motors incorporated. Permanent magnets Integrated commutation electronics Integrated P.I.D functionality > P.I.D.- Proportional Integrative Derivative- Ability to have open or closed loop control functionality. Factory balanced air moving device Factory assembled motor mount brackets and housings

6 What are EC Systems Will always operate in the correct direction of rotation Operate on 50-60Hz with the same performance Operate on a wide voltage range with the same performance: volt Single phase volt Three phase volt Three phase Power Factor Correction Operate much cooler longer life

7 EC Systems Protective Features Alarm relay Locked-rotor protection Phase failure protection Soft start Low voltage protection Over-temperature protection of electronics and motor Short-circuit protection EMI & RFI Filtering

8 Data Center EC Cooling Opportunities today EC applications today for use in the Data Center EC Axial fans for: Air Cooled Chillers Air Cooled Condensers Dry Coolers Fluid Coolers Evaporative Condensers/Cooling Towers

9 Data Center EC Cooling Opportunities today EC applications today for use in the Data Center EC Radial Backward Curved and Forward Curved fans for: CRAC (Direct Expansion A/C) Units CRAH Unit (Water Cooled Air Handling A/C) Units Supplementary Cooling Systems Free Air Cooling Systems In-Row Cooling UPS Cooling Full Rack Cooling

10 Why EC Motors? Highest Motor Efficiency Motor efficiency [%] EC-Motor 3~AC 1~AC Shaded pole motor Output power P2 [W]

11 Why is an EC motor so efficient? Let s identify with system losses Electrical input losses AC EC shaft power loss stator air gap lamination loss 200 W 80 W copper loss 200 W 120 W additional losses rotor slip loss 60 W 0 W frictional loss Mechanical output Variable speed 160 W 80 W drive total losses 620 W 280 W

12 EC Systems: Power Consumption Electricity savings in multi-fan applications 100% 75% On/Off operation EC modulation power input 50% 25% 0% 13% 25% 38% 50% 63% 75% 88% 100% airflow capacity P 1 ~ n 3

13 EC Systems: Acoustics Noise reduction in multi-fan applications noise difference [dba] On/Off operation EC modulation 13% 25% 38% 50% 63% 75% 88% 100% airflow capacity delta Lp [db] = 50 x log10 (n 1 /n 2 )

14 Examples of CRAC with EC Systems Comparison of Operating Costs for EC vs. AC for 12 Months Example A > Company A runs a medium-sized computer center with a thermal load of 300 kw. Instead of using air conditioning units with traditional belt-driven centrifugal fans, the company decided on a precision air conditioning solution with EC fans. Cost Saving $21,024 Annually Payback Period 6.4 Months Unit Type Unit of Measure Traditional Technology EC Technology Number of Units 4 4 Air Flow m3/h 96,000 96,000 Cooling Capacity (Total) kw Cooling Capacity (Sensible) kw Compressor Power Consumption kw Fan Power Consumption kw Total Power Consumption kw Noise Level, 2 m, free field db(a) Purchase Price $ 63, , Annual Operating Costs $ 88, , Savings in Energy Costs $ 21, Payback Months 6.4 Energy Costs at $.10

15 Examples of CRAC with EC Systems Comparison of Operating Costs for EC vs. AC with/without Standby Unit for 12 Months Example B > This example shows running 3 units full vs. 4 at reduced speed. Cost Saving $7,621 Annually Unit Type Unit of Measure Conventional Energy Saving Mode Number of Units 4 4 Number of Units in Standby 1 0 Operating Point, Air Flow % Total Air Flow m3/h 85,000 85,000 Cooling Capacity (Sensible) kw Total Power Consumption kw Noise Level 2 m, free field db(a) Annual Operating Costs $ 15, , Savings in Energy Costs $ 7, Conventional Operation 3 units run at full load to cover the thermal load. One unit is in standby mode. Energy Saving Mode with EC 4 units run at partial load.

16 EC Systems: Power saving designs and Examples at the cabinet level Replacing standard AC fans with EC 10 inch AC fan > 230VDC > 550CFM > 61Watts 10 inch EC fan > 230 VAC > 600 CFM > 34 Watts

17 EC Systems: Power saving designs and Examples at the cabinet level Today Current Design- 80 fans per system (120mm), 50 Watts each, 4000 CFM requirement Power consumption Watts Next Generation Diagonal design- 8 fans per system, 4000 CFM, Estimated-130 Watts per fan Power Consumption Watts 2960 Watts per Rack Power Savings

18 EC Systems: Cooling for the next generation Conclusion EC Systems 30% less power consumption Longer life Communication link Lower noise Global voltage/frequency Good for the environment.

19 Thank you for your attention! 19