24. !
Power
o d
Normal mode
Bypass
Static bypass
supply
o
•Normal mode
• The output voltage is newly generated, Rectifier Inverter
independently from the input voltage
Rectifie AC DC Load
• Heat losses are present in rectifier and inverter r
G
DC AC
supply
Battery bank
•Super Eco Mode
• Load is supplied via the bypass Super Eco Mode
• UPS rectifier keeps the battery charged
Bypass
• UPS inverter switched off supply
Static bypass
(no heat losses)
Rectifier Inverter Transf.
Rectifie AC DC Load
r DC AC
supply
Battery bank
25. End Result
Standard DC CIX
Chiller 33% 12%
Humidifier 3% <1%
CRAC 9% 4%
IT Equipment 30% 80%
PDU 5% 0.01%
UPS 18% <2%
Lighting 1% <1%
Switch Gear 1% 1%
27. References
• Uptime Institute - www.upsite.com
• APC - www.apc.com
• GE - www.ge.com
• CIX Energy Efficiency White Paper - www.cix.ie/air-
conditioning-efficiency-at-the-cix-data-centre
28. Thanks
Tom Raftery
Blog: www.greenmonk.net
Email: tom@redmonk.com