UNLIMITED FREE ACCESS TO THE WORLD'S BEST IDEAS

close
Already an Engineering360 user? Log in.

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

Customize Your Engineering360 Experience

close
Privacy Policy

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

ASHRAE STD 90.4

Energy Standard for Data Centers

active, Most Current
Buy Now
Organization: ASHRAE
Publication Date: 30 October 2020
Status: active
Page Count: 6
scope:

FOREWORD

Addendum a encourages recovery of waste heat from data centers for use in space heating and industrial applications, resulting in net energy savings on a societal level. The addendum also encourage siting of data centers in proximity to heat-consuming commercial and industrial processes (e.g., food production facilities) in order to take advantage of heat transfer, minimize waste, and reduce overall energy use.

Addendum a also improves and clarifies ambiguous and obsolete language in Section 6.5. For example, 6.5 currently says "In the case of cooling provided by a source other than electricity, the energy consumption shall be converted to kilowatt-hours" but does not say how to perform this conversion. This addendum clarifies how to perform the conversion. Currently, Section 6.5 also says to include chiller and AHU fan energy serving a UPS room but does not say to include cooling tower or pump energy serving the UPS room, which was clearly the intent. This addendum clarifies that the energy of all mechanical equipment serving UPS rooms is also included.

The other substantive change to Section 6.5 is removal of language that states in part, "...if the data center utilizes mechanical cooling, the calculated rack inlet temperature and dew point must be within Thermal Guidelines for Data Processing Environments recommended thermal envelope for more than 8460 of the hours per year." Many data centers operate outside the ASHRAE Thermal Guidelines for more than 300 hours per year and do not have the capacity to stay within them for 8460 hours. This addendum allows designers to model their data centers as they are truly intended to operate.

Note: In this addendum, changes to the current standard are indicated in the text by underlining (for additions) and (for deletions) unless the instructions specifically mention some other means of indicating the changes.

Document History

March 23, 2021
Energy Standard for Data Centers
A description is not available for this item.
ASHRAE STD 90.4
October 30, 2020
Energy Standard for Data Centers
FOREWORD Addendum a encourages recovery of waste heat from data centers for use in space heating and industrial applications, resulting in net energy savings on a societal level. The addendum also...
October 30, 2020
Energy Standard for Data Centers
FOREWORD Addendum e adds language to Section 11 intended to clarify how compliance with Standard 90.4 can be achieved through the use of shared systems. Note: In this addendum, changes to the...
October 30, 2020
Energy Standard for Data Centers
FOREWORD Addendum b clarifies exactly how credit can be taken for renewables. The renewables credit is limited to 5% of the IT load in order to encourage renewable energy while still requiring...
October 30, 2020
Energy Standard for Data Centers
FOREWORD Interpretation IC 90.4-2016-1-OF of was approved on January 8, 2020, in response to a Request for Interpretation of the Standard 90.4 consideration of diesel-rotary UPS systems (DRUPS) and...
January 8, 2020
Energy Standard for Data Centers
A description is not available for this item.
October 16, 2019
Energy Standard for Data Centers
A description is not available for this item.
June 22, 2019
Energy Standard for Data Centers
FOREWORD The intent of this addendum is to reduce inconsistencies between ASHRAE Standard 90.4, Energy Standard for Data Centers, and ASHRE/IES Standard 90.1, Energy Standard for Buildings Except...
June 22, 2019
Energy Standard for Data Centers
FOREWORD Addendum g lowers the Mechanical Load Component (MLC) values required for compliance in Section 6. The MLC values published in the 2016 edition of Standard 90.4 exceeded the required limits...
June 22, 2019
Energy Standard for Data Centers
FOREWORD The first edition of Standard 90.4 was published in July 2016. Accordingly, the Electrical Loss Component (ELC) data were based on the performance of electrical distribution equipment on...
January 1, 2019
Energy Standard for Data Centers
This standard applies to a. new data centers, or portions thereof, and their systems; b. new additions to data centers, or portions thereof, and their systems; and c. modifications to systems and...
May 31, 2018
Energy Standard for Data Centers
A description is not available for this item.
January 20, 2018
Energy Standard for Data Centers
FOREWORD Addendum b cleans up redundant wording in Section 4.1.1.2 and creates a more level planning field in Section 4.2.1.2 while eliminating inappropriate text. The addendum clarifies the...
January 20, 2018
Energy Standard for Data Centers
FOREWORD Addendum a deletes the definition of “alteration” from Section 3 of Standard 90.4 and defaults to the definition used in Standard 90.1 (which is reproduced in Standard 90.4, Annex 1). This...
June 29, 2016
Energy Standard for Data Centers
This standard applies to a. new data centers, or portions thereof, and their systems; b. new additions to data centers, or portions thereof, and their systems; c. and modifications to systems and...
Advertisement