Yogendra Joshi: Energy Efficient Thermal Management of Data Centers

Title : Energy Efficient Thermal Management of Data Centers  Picture1
Course Leader: Yogendra Joshi
Affiliation: G.W. Woodruff School of Mechanical Engineering
Georgia Institute of Technology, Atlanta, GA 30332

Course Description: While a number of energy efficiency initiatives have recently resulted in slowing the growth rate of energy consumption by data centers, currently about 3% of the electrical energy produced in the world is consumed by data centers. As much as 20%-50% of this is associated with the operation of the cooling hardware.  In this course, I will focus on energy efficient thermal management of data centers.  Starting from the trends in energy consumption by cabinets and data centers, I will discuss the currently used metrics to quantify their energy efficiency and sustainability. I will discuss the evolution of the environmental guidelines for data centers, prescribed by the American Society of Heating refrigeration and Air Conditioning (ASHRAE). I will then focus on approaches to improve energy efficiency of air-cooled data centers. Emerging trends such as improved air delivery, aisle containment, and “free cooling” will be discussed. Concepts of model based robust and sustainable design of data center facilities of the future will be addressed. A growing segment of data centers are high performance computing (HPC) installations. The growth towards exa-scale computing imposes some of the most serious thermal management and energy efficiency challenges for such facilities. Advanced thermal management approaches including hybrid liquid/air cooling, and liquid immersion cooling to handle the projected sharp increases in server heat loads in HPC will be discussed.
Course Outline: The course will present the following topics:

  • Energy consumption trends by servers, cabinets, and data centers
  • Energy efficiency metrics
  • Environmental control guidelines evolution
  • Current state-of-the-art of data center thermal management
  • Emerging trends for energy efficiency improvement
    – Improved tile air delivery
    – Aisle containment
    – “Free cooling”
  • Energy efficiency enhancements in air cooled data centers through cooling advances
    – Metrology
    – Modeling and sustainable design
  • Thermal management for High performance computing
    – Hybrid, and indirect liquid cooling
    – Direct liquid cooling
  • Future thermal management trends


Energy Efficient Thermal Management of Data Centers, Yogendra Joshi and Pramod Kumar, Editors, Springer, 2012.

Air Flow Management in Raised Floor Data Centers, Vaibhav K. Arghode, and Yogendra Joshi, Springer, 2016.

Biography: Yogendra Joshi is Professor and John M. McKenney and Warren D. Shiver Distinguished Chair at the G.W. Woodruff School of Mechanical Engineering at the Georgia Institute of Technology. His research interests are in multi-scale thermal management. He received a Ph.D. in Mechanical Engineering and Applied Mechanics, from the University of Pennsylvania in 1984. He is the author or co-author of over 320 archival journal and conference publications, and is an elected Fellow of the ASME, the American Association for the Advancement of Science, and IEEE. He was a co-recipient of ASME Curriculum Innovation Award (1999), Inventor Recognition Award from the Semiconductor Research Corporation (2001), the ASME Electronic and Photonic Packaging Division Outstanding Contribution Award in Thermal Management (2006), ASME J. of Electronics Packaging Best Paper of the Year Award (2008), IBM Faculty Award (2008), IEEE Semitherm Significant Contributor Award (2009), IIT Kanpur Distinguished Alumnus Award (2011), ASME InterPack Achievement Award (2011), ITherm Achievement Award (2012), and ASME Heat Transfer Memorial Award (2013).