...Aaron P. Wemhoff; Faisal Ahmed Physics-based modeling aids in designing efficient data center power and cooling systems. These systems have traditionally been modeled independently under the assumption that the inherent coupling of effects between the systems has negligible impact. This study tests...

...Sebastian Araya; Aaron P. Wemhoff; Gerard F. Jones; Amy S. Fleischer The ongoing growth in data center rack power density leads to an increased capability for waste heat recovery. Recent studies revealed the organic Rankine cycle (ORC) as a viable means for data center waste heat recovery since...

...Yogesh Fulpagare; Atul Bhargav; Yogendra Joshi With the explosion in digital traffic, the number of data centers as well as demands on each data center, continue to increase. Concomitantly, the cost (and environmental impact) of energy expended in the thermal management of these data centers...

...Yusuke Nakajo; Jayati Athavale; Minami Yoda; Yogendra Joshi; Hiroaki Nishi With the rapid growth in demand for distributed computing, data centers are a critical physical component of the “cloud.” Recent studies show that the energy consumption of data centers for both cooling and computing keeps...

...Rehan Khalid; Aaron P. Wemhoff Two self-developed control schemes, ON/OFF and supervisory control and data acquisition (SCADA), were applied on a hybrid evaporative and direct expansion (DX)-based model data center cooling system to assess the impact of controls on reliability and energy efficiency...

... on the thermal performance. To express the flow and heat transfer process of cold air in servers and analyze the critical factors affecting the temperature rise, a simplified mathematical model representing servers is developed using experimental results. An experiment is conducted within a modular data center...

... coefficient RU = rack unit References [1] U.S. Environmental Protection Agency (EPA), 2007 , “ Report to Congress on Server and Data Center Energy Efficiency: Public Law 109-43 ,” U.S. Environmental Protection Agency , Washington, D.C. [2] Choi , J. , Kim , Y...

...Vaibhav K. Arghode; Yogendra Joshi Air flow modeling is extensively used in designing and thermally managing data centers. Recently, it has been recognized that the tile’s geometrical features have significant effect on the downstream flow field [ 6 ]. For improving predictive capability...

... was determined experimentally to be ±7.5% of the reading. Measurements were made for individual tiles with 2 min intervals between each reading, allowing data center conditions to stabilize after the flow hood is moved over a tile. This research was mainly supported by the National Science Foundation...

...Emad Samadiani; Hrishikesh Amur; Bhavani Krishnan; Yogendra Joshi; Karsten Schwan Concurrency and exchanging design knowledge among thermal and IT management are required to achieve an energy efficient operational data center. In this paper, a design approach is presented to bring adaptability...

...Roger Schmidt; Madhusudan Iyengar; Joe Caricari With the ever increasing heat dissipated by information technology (IT) equipment housed in data centers, it is becoming more important to project the changes that can occur in the data center as the newer higher powered hardware is installed...

...Emad Samadiani; Jeffrey Rambo; Yogendra Joshi This paper is centered on quantifying the effect of computer room and computer room air conditioning (CRAC) unit modeling on the perforated tile flow distribution in a representative raised-floor data center. Also, this study quantifies the effect...