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Dependence of ESD Charge Voltage on Humidity in Data Centers: Part II - Data Analysis
ASHRAE Transactions
  • Atieh Talebzadeh
  • Abhishek Patnaik
  • Xu Gao
  • Mahdi Moradian
  • David E. Swenson
  • David Pommerenke, Missouri University of Science and Technology
This is Part II of a three-part paper investigating the dependence of charge voltage generated by human activity on humidity in data centers. The first paper described the experimental methods, while this paper is devoted to the analysis of the electrostatic charge voltage levels along the following parameters: relative humidity, absolute humidity, footwear, flooring, and type of activity. The human activities studied included well-defined walking, random walking, taking off and dropping a sweater, and standing up from a chair. This study confirms the importance of footwear and flooring and quantifies their effectiveness. The results indicate that lower absolute humidity may not always lead to higher voltages, while reducing the relative humidity will cause the average voltages to increase. The high voltages, created by removing and dropping a sweater and by standing up from a chair, indicate that these types of user activities might pose a higher ESD (electrostatic discharge) risk (generating voltage greater than 6 kV) than the walking activities. The analyses are based on the definition of walking, standing, chair event, and sweater event voltages, as presented in Part I.
Meeting Name
2015 ASHRAE Winter Conference (2015: Jan. 24-28, Chicago, IL)
Electrical and Computer Engineering
Research Center/Lab(s)
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
  • Building materials,
  • Electrostatic discharge,
  • Electrostatics,
  • Floors,
  • Random processes,
  • Absolute humidity,
  • Charge voltage,
  • Electrostatic charges,
  • Experimental methods,
  • High voltage,
  • Human activities,
  • User activity,
  • Walking activity,
  • Electrostatic devices
International Standard Book Number (ISBN)
Document Type
Article - Conference proceedings
Document Version
File Type
© 2015 American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) , All rights reserved.
Publication Date
Citation Information
Atieh Talebzadeh, Abhishek Patnaik, Xu Gao, Mahdi Moradian, et al.. "Dependence of ESD Charge Voltage on Humidity in Data Centers: Part II - Data Analysis" ASHRAE Transactions Vol. 121 (2015) p. 37 - 48 ISSN: 0001-2505
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