Data centers' energy auditing and benchmarking-progress update.(Report): An article from: ASHRAE Transactions

This digital document is an article from ASHRAE Transactions, published by American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. on January 1, 2010. The length of the article is 4559 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.

From the author: This paper presents a summary of the energy audit and optimization studies conducted on more than 40 data centers. Comparison of data center energy efficiency metrics is presented. Those metrics include energy utilization metrics such as the Power Usage Effectiveness (PUE), Data Center infrastructure Efficiency (DCiE), mechanical PUE, electrical PUE and thermal or air management metrics such as bypass and recirculation air flow ratios. Additionally, percentages of cooling system, fans, UPS losses, and lighting to total data center power were analyzed and presented. The impact of climate zone as well as the operational load density compared to design load density were considered as well. These metrics incorporate and integrate together the major factors that decrease the effectiveness of computer room air cooling and the entire data center infrastructure. The energy utilization metrics determine the extent of the efficiencies of the data center supporting mechanical and electrical infrastructures. Interestingly, the database indicated that small data centers [Raised Floor Area (RFA)