ASHRAE Journal - July 2022 - 24
DATA CENTERS
Column
Fifth Edition Highlights
ASHRAE's Data Center
Thermal Guidelines
BY DAVID QUIRK, P.E., MEMBER ASHRAE; TOM DAVIDSON, P.E., MEMBER ASHRAE; ROGER SCHMIDT, PH.D., P.E., FELLOW ASHRAE
Thermal Guidelines for Data Processing Environments, Fifth Edition, has some important
updates for both air-cooled and liquid-cooled environments. Our column in May's
ASHRAE Journal focused on changes to the air-cooled classes defined by ASHRAE's
Thermal Guidelines for Data Processing Environments and the history of changes during
the 18 years since the original Thermal Guidelines was published in 2004. The focus of
this month's column is to look in detail at the changes between the fourth and fifth
editions, published in 2015 and 2021, respectively.
The update was driven by both an ASHRAE research
project and a need to adjust to recent information technology
(IT) industry equipment trends.
The primary changes between the Fourth Edition and
the Fifth Edition were:
* A change to the recommended temperature/humidity
envelope because of research into the concurrent
impact of relative humidity (RH) and gaseous
pollutants on information technology equipment (ITE)
corrosion;
* The addition of a new high-density air-cooled environmental
envelope (Class H1); and
* A change in the nomenclature of liquid-cooling
classes to reflect each class's maximum liquid inlet
temperature.
These changes will be described in more detail in the
remainder of this column.
24
ASHRAE JOURNAL ashrae.o rg
J U LY 2022
Change in Air-Cooled Recommended Envelope Based on
Corrosion Research
For most U.S. locations, gaseous pollutants are not
typically a major problem for the ITE found in data centers,
except possibly during upset conditions, such as an
external fire. Worldwide, however, gaseous air pollution
can be more of an issue. The increased failure rates seen
for data center ITE in polluted cities was observed by
the ITE manufacturers, and created the impetus for an
ASHRAE research project (RP-1755) to study the issue.
For RP-1755, Impact of Gaseous Contamination
and High Humidity on the Reliable Operation of
Information Technology Equipment in Data Centers,
from 2015 to 2018 ASHRAE funded Syracuse University
Mechanical and Aerospace Engineering Department to
David Quirk, P.E., is a managing principal, and Tom Davidson, P.E., is a senior mechanical
engineer at DLB Associates. Roger Schmidt, Ph.D., P.E., is an IBM Fellow Emeritus
and a professor at Syracuse University.
http://ashrae.org
ASHRAE Journal - July 2022
Table of Contents for the Digital Edition of ASHRAE Journal - July 2022
Contents
ASHRAE Journal - July 2022 - Intro
ASHRAE Journal - July 2022 - BB1
ASHRAE Journal - July 2022 - BB2
ASHRAE Journal - July 2022 - Cover1
ASHRAE Journal - July 2022 - Cover2
ASHRAE Journal - July 2022 - 1
ASHRAE Journal - July 2022 - Contents
ASHRAE Journal - July 2022 - 3
ASHRAE Journal - July 2022 - 4
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ASHRAE Journal - July 2022 - Cover3
ASHRAE Journal - July 2022 - Cover4
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