ASHRAE Journal - August 2010 - 30
Implications of Current Thermal Guidelines
M
By Mark Hydeman, P Fellow ASHRAE .E., ost data centers are designed and operated according to existing industry guidelines for temperature and humidity control. These guidelines include ASHRAE Special Publication Thermal Guidelines for Data Processing Environments,1 ANSI/TIA-942-1 2005 Telecommunications Infrastructure Standard for Data Centers2 developed by the Telecommunication Industry Association (TIA), and the Network Equipment Building Systems (NEBS), which also is used by the telecommunication industry for telecom central office facilities. This article examines the impact of these guidelines on datacom facility efficiency and suggests ways to improve them.
Existing Thermal Guidelines
For Data Center Energy Use
Manufacturing Environment or Store; NEBS: Telecommunications Central Office Facility. As shown in Figure 1, the recommended temperature and humidity envelope expanded in 2008. This change is significant as it increased the number of hours that a typical data center can be cooled using an economizer or evaporative (noncompressor) cooling. However, as discussed later, the upper and lower humidity limits severely handicap the operation of these eff icient cooling technologies. These specifications are defined at the inlet to the IT or data communications (datacom) equipment. A server typically has discharge temperatures 20°F to 60°F (11°C to 33°C) higher than the inlet. About the Author
Mark Hydeman, P is a principal and founding .E., partner at Taylor Engineering in Alameda, Calif. He is a member of ASHRAE TC 9.9 and vice-chair of SSPC 90.1. He was lead developer of TC 9.9’s Research Work Statement 1499 on humidity control.
The current published recommendations for temperature and humidity control in data centers are shown in Figure 1. Thermal Guidelines defines recommended and allowed ranges for temperature and humidity as follows: • Recommended. Facilities should be designed and operated to target the recommended range; and
30 ASHRAE Journal
• Allowable. Equipment should be designed to operate within the extremes of the allowable operating environment. In addition, Thermal Guidelines addresses five classes of datacom facilities (Table 1). Class 1: Standard Data Center; Class 2: Information Technology (IT) Space, Office or Lab Environment; Class 3: Home or Home Office; Class 4:
ashrae.org
August 2010
ASHRAE Journal - August 2010
Table of Contents for the Digital Edition of ASHRAE Journal - August 2010
Contents
Commentary
Industry News
Letters
Meetings and Shows
2010-11 Presidential Address: Modeling a Sustainable World
Refrigeration Air Cooler Rating Methods
Implications of Current Thermal Guidelines for Data Center Energy Use
DOAS & Building Pressurization
Building Sciences
InfoCenter
Emerging Technologies
Special Products
Washington Report
Technical Topics
People
Classified Advertising
Advertisers Index
ASHRAE Journal - August 2010 - Intro
ASHRAE Journal - August 2010 - Cover1
ASHRAE Journal - August 2010 - Cover2
ASHRAE Journal - August 2010 - 1
ASHRAE Journal - August 2010 - 2
ASHRAE Journal - August 2010 - Contents
ASHRAE Journal - August 2010 - Commentary
ASHRAE Journal - August 2010 - 5
ASHRAE Journal - August 2010 - Industry News
ASHRAE Journal - August 2010 - 7
ASHRAE Journal - August 2010 - 8
ASHRAE Journal - August 2010 - 9
ASHRAE Journal - August 2010 - 10
ASHRAE Journal - August 2010 - 11
ASHRAE Journal - August 2010 - 12
ASHRAE Journal - August 2010 - 13
ASHRAE Journal - August 2010 - Letters
ASHRAE Journal - August 2010 - 15
ASHRAE Journal - August 2010 - Meetings and Shows
ASHRAE Journal - August 2010 - 17
ASHRAE Journal - August 2010 - 2010-11 Presidential Address: Modeling a Sustainable World
ASHRAE Journal - August 2010 - 19
ASHRAE Journal - August 2010 - 20
ASHRAE Journal - August 2010 - 21
ASHRAE Journal - August 2010 - 22
ASHRAE Journal - August 2010 - 23
ASHRAE Journal - August 2010 - Refrigeration Air Cooler Rating Methods
ASHRAE Journal - August 2010 - 25
ASHRAE Journal - August 2010 - 26
ASHRAE Journal - August 2010 - 27
ASHRAE Journal - August 2010 - 28
ASHRAE Journal - August 2010 - 29
ASHRAE Journal - August 2010 - Implications of Current Thermal Guidelines for Data Center Energy Use
ASHRAE Journal - August 2010 - 31
ASHRAE Journal - August 2010 - 32
ASHRAE Journal - August 2010 - 33
ASHRAE Journal - August 2010 - 34
ASHRAE Journal - August 2010 - 35
ASHRAE Journal - August 2010 - 36
ASHRAE Journal - August 2010 - 37
ASHRAE Journal - August 2010 - 38
ASHRAE Journal - August 2010 - 39
ASHRAE Journal - August 2010 - 40
ASHRAE Journal - August 2010 - 41
ASHRAE Journal - August 2010 - DOAS & Building Pressurization
ASHRAE Journal - August 2010 - 43
ASHRAE Journal - August 2010 - 44
ASHRAE Journal - August 2010 - 45
ASHRAE Journal - August 2010 - 46
ASHRAE Journal - August 2010 - 47
ASHRAE Journal - August 2010 - 48
ASHRAE Journal - August 2010 - 49
ASHRAE Journal - August 2010 - 50
ASHRAE Journal - August 2010 - 51
ASHRAE Journal - August 2010 - 52
ASHRAE Journal - August 2010 - 53
ASHRAE Journal - August 2010 - Building Sciences
ASHRAE Journal - August 2010 - 55
ASHRAE Journal - August 2010 - 56
ASHRAE Journal - August 2010 - 57
ASHRAE Journal - August 2010 - InfoCenter
ASHRAE Journal - August 2010 - 59
ASHRAE Journal - August 2010 - 60
ASHRAE Journal - August 2010 - 61
ASHRAE Journal - August 2010 - 62
ASHRAE Journal - August 2010 - 63
ASHRAE Journal - August 2010 - 64
ASHRAE Journal - August 2010 - 65
ASHRAE Journal - August 2010 - Emerging Technologies
ASHRAE Journal - August 2010 - 67
ASHRAE Journal - August 2010 - 68
ASHRAE Journal - August 2010 - 69
ASHRAE Journal - August 2010 - Special Products
ASHRAE Journal - August 2010 - Washington Report
ASHRAE Journal - August 2010 - Technical Topics
ASHRAE Journal - August 2010 - 73
ASHRAE Journal - August 2010 - 74
ASHRAE Journal - August 2010 - 75
ASHRAE Journal - August 2010 - People
ASHRAE Journal - August 2010 - 77
ASHRAE Journal - August 2010 - Classified Advertising
ASHRAE Journal - August 2010 - 79
ASHRAE Journal - August 2010 - Advertisers Index
ASHRAE Journal - August 2010 - Cover3
ASHRAE Journal - August 2010 - Cover4
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