Mission Critical Facilities, Data Centers, Technology Spaces and Electronic Equipment
ASHRAE Technical Committee 9.9


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TC0909 Kansas City Agenda 20190623

Upcoming TC Meetings

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Location: Orlando, FL
Sunday, 2/2/2020  Room
5:00 PM - 7:00 PM - Programs, Handbook and Research


Monday, 2/3/2020  
2:15 PM - 7:30 PM - Main Committee


TC 9.9 sponsored seminars, conference paper session, data center related topics, etc. will be posted for each conference in the Meetings section of this website.



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Committee Chair

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Dustin Demetriou TC0909@ashrae.net

Committee Scope

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TC 9.9 is concerned with all aspects of mission critical facilities, data centers, technology spaces, and electronic equipment/systems.


Upcoming Society Conferences

2019 Annual Conference
June 22-26, 2019
Kansas City, MO


Conference Badges

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Latest TC Activities

If you would like to get involved in this TC's activities you can contact the appropriate Point of Contact in the TC 9.9 Work Items listing, attend the biannual meetings, or contact our committee chair at tc0909@ashrae.net.

New! ASHRAE TC 9.9 Hard Disk Drive Performance Degradation Susceptibility to Acoustics White Paper

This white paper serves to educate the data center community on the risks to hard disk drive (HDD) throughput performance from acoustics created by AMDs running at high speeds to adequately cool components within the racks. The methods used to optimize data center total cost of ownership (TCO) need to include these performance risks that can impact customer applications.

Kansas City ASHRAE TC 9.9 Presentations

2019 Kansas City Programs Update

2019 Kansas City Applications Handbook Presentation

These presentations can also be found under "Presentations" in the Documents section of this website.

ASHRAE TC 9.9 Water-Cooled Servers White Paper

TC 9.9 has released a new white paper entitled "Water-Cooled Servers: Common Designs, Components, and Processes." With more water-cooled IT products arriving in the marketplace, TC 9.9 felt the need to outline some of the common processes, parts, and materials for focus in use for future water-cooled designs. This white paper also corrects misunderstandings in the latest edition of Liquid Cooling Guidelines for Datacom Equipment Centers, and provides guidance for avoiding common mistakes based upon the book’s content. Much of the content in this white paper will be incorporated into a future third edition.

ASHRAE TC 9.9 Liquid Cooling White Paper

TC 9.9 has released a new white paper entitled "The Advancement of Liquid Cooling Solutions: The Perfect Storm Brewing" which addresses the growing trend of liquid cooling solutions in the data center. This brief is a window into a more comprehensive TC 9.9 white paper to be released later this year.


ASHRAE 90.1 Energy Standard Publication Public Review

2nd Public Review of BSR/ASHRAE/IES Addendum bv to ANSI/ASHRAE/IES Standard 90.1-2016, Energy Standard for Buildings Except Low-Rise Residential Buildings

The purpose of this addendum is to allow designers the option to use ASHRAE Standard 90.4 requirements instead of ASHRAE 90.1 requirements in computer rooms that have an IT equipment load larger than 10 kW. A computer room that has such a load is the same as the defined term “data center” in ASHRAE Standard 90.4.  Publication Public Review (PPR)

 Addendum bv: This addendum removes all exceptions related to computer rooms (part of the original 2010 Standard) and removes the Alternative Compliance Path PUE (added in 2013) and replaces it with with Standard 90.4-2016.
(45 Day Public Review Period from February 8, 2019 to March 25, 2019)


ASHRAE 90.4 Energy Standard for Data Centers

The new ASHRAE Standard 90.4-2016, Energy Standard for Data Centers, establishes the minimum energy efficiency requirements of data centers for design and construction and for creation of a plan for operation and maintenance, and for utilization of on-site or off-site renewable energy resources.  Through publication of its Datacom series, ASHRAE has emerged as a leader in the data center field.  Standard 90.4 draws upon the collective expertise of the industry to promote stable and sustainable data centers.  To learn more about this standard, click on this link for an overview presentation.

ASHRAE TC 9.9 Overview Presentation

As committed at the Orlando meeting, the overview presentation for TC 9.9 has been updated and is now available on this site.  This overview can be used by members to understand what TC 9.9 does and the resources available from TC 9.9.  Please consider this as ASHRAE’s material and always follow appropriate use considerations.


ANSI/ASHRAE Standard 90.4-2016 Public Review Addenda

To Members and Parties Interested in SSPC 90.4, the following addenda to ANSI/ASHRAE Standard 90.4-2016, Energy Standard for Data Centers will be out for a 30 day public review:

30 day Public Review
August 25th, 2017 – September 24th, 2017

1st Public Review of BSR/ASHRAE Addendum to ANSI/ASHRAE Standard 90.4-2016, Energy Standard for Data Centers

This addendum deletes the definition of alteration from Section 3 of Standard 90.4, thereby reverting to the definition of alteration in Standard 90.1 (which is reproduced in Standard 90.4 Annex 1).

1st Public Review of BSR/ASHRAE Addendum to ANSI/ASHRAE Standard 90.4-2016, Energy Standard for Data Centers

This addendum clarifies the exception in Section that addresses the case where existing HVAC systems and equipment serve an addition, and adds parallel criteria to Section 8.1.3 for electrical equipment.


ASHRAE TC 9.9 Data Center Power Thermal Guidelines White Paper

The paper, “Data Center Power Equipment Thermal Guidelines and Best Practices” contains an overview of data center power distribution and how changes in the data center thermal environment can affect power distribution equipment.  The paper includes recommendations on how to improve power equipment thermal compatibility with IT equipment particularly where power equipment shares the same physical space and air stream as IT equipment.


Thermal Guidelines for Data Center Processing Environments, 4th Edition - Errata

An error was discovered in the latest edition of the ‘Thermal Guidelines’ book. ASHRAE has produced the attached errata and it can be downloaded by everyone from the following webpage (You do not have to have purchased the book to download the errata page.)


 Please check out this errata which addresses the humidity levels for all ASHRAE air classes.  Anyone can print out the material and insert it into their copy of the Thermal Guidelines book.  The PDF will not be updated until the next reprint which may take some time.


TC 9.9 Approved Definitions for Data Centers, ITE, and ITE Enclosures

TC 9.9 is recognized as a leader in driving the data center environmental knowledge and best practices in the industry. At the ASHRAE Annual Meeting in Orlando, TC 9.9 discussed one area where we must help to align our industry. Previously TC 9.9 has not provided definitions for ITE and locations where it is housed. It is essential that we do this to meet our mission "To be recognized by ALL areas of the datacom industry as the unbiased engineering leader in HVAC and an effective provider of technical information for the datacom industry."

It is important for data centers to be excluded from codes written for human occupancy. Even an IT server rack does NOT fit human occupancy codes. Racks that belong in human occupancy codes are ones supporting building services such as fire, security, HVAC, audio / video, etc. These racks are typically far less than 2 KW per rack. There might be occasional exceptions but those are minor compared to human occupancy codes requiring economizers on 2 KW IT server racks.

TC 9.9 has approved the following definitions for use by those needing to quantify data center related terms. Please consider them as the position of TC 9.9 as we move forward in developing standards, codes and general communications for our industry.

1) Data Center: A room or building, or portions thereof, with one or more ITE enclosures greater than 2 KW.
2) Information Technology Equipment (ITE): Computers, data storage, servers and network / communication equipment.
3) ITE Enclosure: A rack, cabinet, or chassis that is designed to mount ITE.


ASHRAE TC 9.9 Presentations

Past presentations given at the ASHRAE annual and winter meetings are now available.  They can be found on the Documents page under the 'Other Publications' section.

New White Papers

Data Center Storage Equipment - Thermal Guidelines, Issues and Best Practices

This paper defines thermal guidelines best practices for storage equipment. The intended audience is both storage hardware designers and storage equipment users. The thermal guidelines were written by a team of storage subject matter experts from many different companies and the recommendations are industry-wide best practices which are agnostic of the point of view of any one company.

Clarification to ASHRAE Thermal Guidelines

There has been some confusion of ASHRAE's definition in the Thermal Guideline Datacom Book of the Temperature Rate of Change specified in the table for Equipment Environmental Specifications for Air Cooling. This addendum helps describe in detail examples of air inlet that are either non-compliant or compliant to ASHRAE's temperature rate of change requirements for data centers.

ASHRAE Bookstore

A bulk quantity discount for the Datacom Series Products applies to purchases of 10 or more copies of one title or any combination of titles.

TC 9.9 Datacom Books

Quantity discounts are available for purchases of 10 or more books (mix & match).  Please contact the Manager of Inventory and Subscriptions for instructions on receiving your discount.

Visit the ASHRAE Bookstore Now!