floors of the downtown office building. UPS systems continually convert power from alternating current (AC) to direct current and then back to AC before supplying the IT equipment. This conversion process was very inefficient because the size and design of the systems did not match the power load for the space. Most existing data centers are over- designed because of plans for future expansion that never happen, improve- ment in newer IT equipment efficiency and the general industry trend to consolidate operations. In this case, as much as 25 percent of the incoming power was wasted because of the data center’s over-designed UPS systems. To fix this problem, the entire UPS load was consolidated into one system, resulting in increased efficiency and much lower maintenance costs. Lastly, because the two UPS systems each had three indepen- dent modules and the load in the space only needed one module to operate, there was no sacrifice to redundancy.
Project Benefits The project, which took more than five
months to complete, was finalized in June 2012. The data-center upgrades are expected to result in annual savings of 1,616,411 kWh. This is equivalent to operating more than 100 average residential homes for one year or the removal of 1,115 metric tons of carbon dioxide from the atmosphere. The operating cost savings are from reduced direct-power consumption and chilled-water usage. In addition, the consolidation of the
UPS systems will directly reduce annual maintenance costs by almost $50,000 per year. With less CRAH units operating at much lower speed, maintenance costs for these units also will be reduced, equipment life span will be increased and there now is reliable cooling-system redundancy.
In addition, the new utility metering
system allowed Hawkeye Energy Solutions’ engineers to uncover a significant tenant chilled-water metering issue, which resulted in an additional 38 percent reduction in chilled-water costs for the law firm. The utility metering and monitoring sys-
tem will continuously watch for peaks and valleys in power usage. If, for any reason, the system power usage rises above its newly reduced baseline, the system will automati- cally send email alerts to the IOG director and his staff so they promptly can address the issues as they happen and before they create significant expenses. The system will ensure that the law firm realizes energy sav- ings for years to come.
INCENTIVES from the local utility brought the payback for the project to less
than one year, which was right on target with the law firm’s expectations.
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Circle No. 28
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