2015 Volume 8 Issue 1 Pages 37-45
Modular data center, which is often packaged in standard shipping formats, has been introduced to construct and deploy data centers more quickly and economically than conventional data centers. To conserve cooling costs in modular data centers, aisle containment is employed by dividing the top of the racks using partitions. However, it results in increasing the server fan power due to increase of pressure loss. Simulations were performed to examine the impact for annual power consumption in modular data center where outside air is carried and louvers are mounted on the racks to control air circulation in the server room. We found that total cooling power can be reduced about 5% (10%) for 10 kW (20 kW) rack power when the louver is operated so as to minimize the total cooling power compared to case where the louver is fully closed. The current indicator that measures energy efficiency in data centers, i.e. Power Usage Effectiveness (PUE) is incomplete in terms of cooling power. Therefore, we finally proposed revised PUE and it should be used to estimate the energy efficiency to avoid inaccurate interpretation.