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2019 ASHRAE Handbook-HVAC Applications, Chapter 20: Data Centers and Telecommunication Facilities

ASHRAE · ASHRAE TC 9.9

The data centre chapter of the 2019 ASHRAE Handbook, covering datacom equipment, environmental guidelines, economizer types and the Datacom Series book list.

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Overview

This document is Chapter 20 of the 2019 edition of the ASHRAE Handbook-HVAC Applications, devoted to data centres; the 2023 edition is already in the library. It is authored by ASHRAE TC 9.9 and covers datacom equipment, environmental guidelines and economizers. It also lists Datacom Series Books 1-13 with editions and years, for example Book 2, IT Equipment Power Trends, 3rd edition, 2018.

The economizer section describes direct and indirect air-side economizers and pumped refrigerant-side economizers. It defines wet, dry and hybrid economizers, where a hybrid can be tuned to optimise either water or power use. For water-side economizers, the heat exchanger is recommended in series with the chiller to maximise economizer hours. These definitions give a shared vocabulary for comparing economizer options on water use, energy use and climate.

The bibliography cites TC 9.9 white papers: 2011 contamination, 2012 IT thermal management and controls, and 2014 networking equipment.

Key points

  1. Lists Datacom Series Books 1-13 with editions and years (e.g. Book 2, IT Equipment Power Trends, 3rd ed. 2018).
  2. Describes direct and indirect air-side economizers and pumped refrigerant-side economizers.
  3. Defines wet, dry and hybrid economizers; hybrid can optimise either water or power use.
  4. Recommends the water-side economizer heat exchanger in series with the chiller to maximise economizer hours.
  5. Bibliography cites TC 9.9 white papers: 2011 contamination, 2012 IT thermal management and controls, 2014 networking equipment.
  6. This is the 2019 edition; the 2023 edition is a separate library entry.

Using it in design

  • Cite cooling design rules in an edition-aware way, distinguishing the 2019 and 2023 Handbook editions.
  • When selecting economizers, evaluate direct, indirect and pumped refrigerant-side options together with the wet, dry and hybrid classification.
  • When designing a water-side economizer, treat placing the heat exchanger in series with the chiller as the default for maximising economizer hours.

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Who should read it

Mechanical engineers designing data centre cooling and consultants who cite ASHRAE references.

Related standards

  • ANSI/ASHRAE 90.4-2016
  • ANSI/ASHRAE 127-2012
  • ANSI/TIA-942-B

Publication details

Authors
ASHRAE TC 9.9
Publisher
ASHRAE
Year
2019
Document number
HVAC Applications 2019 Ch. 20
Document language
English
Source type
Standard
Access
Citation only
Licence
Copyright retained; citation only — the publisher’s terms apply to the original document
Original licence note

Copyrighted ASHRAE book sold via ASHRAE Bookstore (and TC 9.9 Datacom Encyclopedia subscription). Not read; metadata from ASHRAE catalogue / Handbook descriptions only. Citation only.

Citation

ASHRAE TC 9.9 (2019). 2019 ASHRAE Handbook-HVAC Applications, Chapter 20: Data Centers and Telecommunication Facilities. ASHRAE. HVAC Applications 2019 Ch. 20. https://handbook.ashrae.org/Handbooks/A19/SI/a19_ch20/a19_ch20_si.aspx

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