Abstract
The accurate calculation of the power usage effectiveness (PUE) is the most important factor when trying to analyse the overall efficiency of the power consumption in a big data center. In the INFN CNAF Tier-1 a new monitoring infrastructure, also known as Building Management System (BMS), has been recently implemented using the Schneider StruxureWare™ Building Operation (SBO) software. During the design phase of this new BMS, a great attention was given to the possibility of collecting several detailed information about the electric absorption of specific devices and parts of the facility. Considering the annual trends and the demands for reducing the operating costs it became clear that some improvements were certainly needed in the very short time. For this reason, a hardware upgrade of the cooling chillers and related chilled water pumps distribution system was seriously considered using innovative cooling technology. We focused on chillers using the Danfoss Turbocor centrifugal compressors technology that uses magnetic levitation and an oil-free approach for obtaining the best efficiency. Subsequently, we studied a solution that could easily compensate the initial investment during the first years of usage (considering the Total Cost of Ownership of the project) and that will improve the overall PUE of our data center.
Highlights
The accurate calculation of the power usage effectiveness (PUE) is the most important factor when trying to analyse the overall efficiency of the power consumption in a big data center
The INFN CNAF Tier-1 is located in the city centre of Bologna and it has become the Italian national data center for the INFN computing activities since 2005 [1]
We have introduced the partial Power Usage Effectiveness (PUE) metric in order to monitor the power demands of a specific area of the infrastructure and possibly implement an optimization
Summary
The INFN CNAF Tier-1 is located in the city centre of Bologna and it has become the Italian national data center for the INFN computing activities since 2005 [1]. During 2009 the upgrade of the Tier-1 resources filled up all the available space at our disposal and this corresponds to a total of 1950 m2 space occupation for two IT rooms (250 m2 + 350 m2) and four additional locations for the remaining main infrastructure facilities These four locations includes the transformers room, the UPS room (rotary UPS + one standard diesel generator used for backup purpose), the chillers room (including the water pumps and related piping system) and the power room with all the power switches and electrical measurement instruments and connections. All areas for technical systems, described in the previous subsection, consisting of three transformers, two redundant 1340 kW DRUPS and six chillers of 300 kW cooling capacity were evaluated for the analysis of the Power Usage Effectiveness (PUE) and partial PUE (pPUE) using the new BMS supervision system. A hardware upgrade of the cooling system and chilled water pumps distribution system has been seriously considered
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
