Mechanical structures for electrical and electronic equipment - Aisle containment for IT cabinets - Part 2: Details of air flow, air separation and air cooling requirements (IEC 62966-2:2020)

This part of IEC 62966, dedicated to aisle containment techniques for information technology
(IT) equipment typically used in data centres, describes the quantification of its air tightness, in
particular the air loss ratio that describes the content of the volumetric flow not used for cooling
the IT equipment. This ratio provides an index of efficiency, being inversely proportional to
efficiency (the lower this ratio, the higher the efficiency). This document provides methods to
measure an aisle containment air leakage rate and defines a classification system for aisle
containment leakage.
This document defines:
a) the measurement of the air leakage of the individual components of an aisle containment;
b) a method for calculating the air leakage of an aisle containment based on its individual
components;
c) a method for calculating the air leakage rate of an aisle containment in relation to the utilised
IT equipment;
d) a classification system for aisle containment leakage.

Mechanische Bauweisen für elektrische und elektronische Einrichtungen – Gangeinhausung für IT-Schränke – Teil 2: Einzelheiten zu Luftstrom-, Lufttrennungs- und Luftkühlungsanforderungen (IEC 62966-2:2020)

Structures mécaniques pour équipements électriques et électroniques - Confinement d’allées pour les baies informatiques - Partie 2: Détails des exigences relatives au flux d’air, à la séparation des flux d’air et au refroidissement par air (IEC 62966-2:2020)

IEC 62966-2:2020 est dédiée aux techniques de confinement pour les équipements informatiques typiquement utilisés dans les centres de données, décrit la quantification de leur étanchéité, et plus particulièrement le taux de fuite d’air, qui définit le débit volumique qui ne sert pas à refroidir les équipements informatiques. Ce taux constitue un indice de rendement, fonctionnant à proportionnalité inverse (plus le taux diminue, plus le rendement augmente). Le présent document donne des méthodes pour mesurer le taux de fuite d’air d’un confinement, et définit un système de classification des fuites du confinement. Le présent document définit: - la mesure des fuites d’air des composants individuels d’un confinement; - une méthode de calcul des fuites d’air d’un confinement, basée sur ses composants individuels; - une méthode de calcul du taux de fuite d’air d’un confinement, en fonction des équipements informatiques utilisés; - un système de classification des fuites du confinement.

Mehanske konstrukcije za električno in elektronsko opremo - Omejitev prehoda za IT-omarice - 2. del: Podrobnosti o zahtevah za pretok, ločevanje in hlajenje zraka (IEC 62966-2:2020)

General Information

Status
Published
Publication Date
08-Oct-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-Oct-2020
Due Date
12-Dec-2020
Completion Date
09-Oct-2020

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SLOVENSKI STANDARD
SIST EN IEC 62966-2:2020
01-december-2020
Mehanske konstrukcije za električno in elektronsko opremo - Omejitev prehoda za

IT-omarice - 2. del: Podrobnosti o zahtevah za pretok, ločevanje in hlajenje zraka

(IEC 62966-2:2020)

Mechanical structures for electrical and electronic equipment - Aisle containment for IT

cabinets - Part 2: Details of air flow, air separation and air cooling requirements (IEC

62966-2:2020)
Mechanische Bauweisen für elektrische und elektronische Einrichtungen –

Gangeinhausung für IT-Schränke – Teil 2: Einzelheiten zu Luftstrom-, Lufttrennungs-

und Luftkühlungsanforderungen (IEC 62966-2:2020)

Structures mécaniques pour équipements électriques et électroniques - Confinement

d’allées pour les baies informatiques - Partie 2: Détails des exigences relatives au flux

d’air, à la séparation des flux d’air et au refroidissement par air (IEC 62966-2:2020)

Ta slovenski standard je istoveten z: EN IEC 62966-2:2020
ICS:
31.240 Mehanske konstrukcije za Mechanical structures for
elektronsko opremo electronic equipment
SIST EN IEC 62966-2:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 62966-2:2020
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SIST EN IEC 62966-2:2020
EUROPEAN STANDARD EN IEC 62966-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS 31.240
English Version
Mechanical structures for electrical and electronic equipment -
Aisle containment for IT cabinets - Part 2: Details of air flow, air
separation and air cooling requirements
(IEC 62966-2:2020)

Structures mécaniques pour équipements électriques et Mechanische Bauweisen für elektrische und elektronische

électroniques - Confinement d'allées pour les baies Einrichtungen - Gangeinhausung für IT-Schränke - Teil 2:

informatiques - Partie 2: Détails des exigences relatives au Einzelheiten zu Luftstrom-, Lufttrennungs- und

flux d'air, à la séparation des flux d'air et au refroidissement Luftkühlungsanforderungen

par air (IEC 62966-2:2020)
(IEC 62966-2:2020)

This European Standard was approved by CENELEC on 2020-08-19. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 62966-2:2020 E
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SIST EN IEC 62966-2:2020
EN IEC 62966-2:2020 (E)
European foreword

The text of document 48D/722/FDIS, future edition 1 of IEC 62966-2, prepared by SC 48D

"Mechanical structures for electrical and electronic equipment" of IEC/TC 48 "Electrical connectors

and mechanical structures for electrical and electronic equipment" was submitted to the IEC-

CENELEC parallel vote and approved by CENELEC as EN IEC 62966-2:2020.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2021-05-19

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2023-08-19

document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 62966-2:2020 was approved by CENELEC as a European

Standard without any modification.
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SIST EN IEC 62966-2:2020
EN IEC 62966-2:2020 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),

the relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available

here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 62966-1 - Mechanical structures for electrical and EN IEC 62966-1 -
electronic equipment - Aisle containment for
IT cabinets - Part 1: Dimensions and
mechanical requirements
ISO 9972 - Thermal performance of buildings - EN ISO 9972 -
Determination of air permeability of buildings -
Fan pressurization method
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SIST EN IEC 62966-2:2020
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SIST EN IEC 62966-2:2020
IEC 62966-2
Edition 1.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Mechanical structures for electrical and electronic equipment – Aisle
containment for it cabinets –
Part 2: Details of air flow, air separation and air cooling requirements
Structures mécaniques pour équipements électriques et électroniques –
Confinement d’allées pour les baies informatiques –

Partie 2: Détails des exigences relatives au flux d’air, à la séparation des flux

d’air et au refroidissement par air
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.240 ISBN 978-2-8322-8510-7

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 62966-2:2020
– 2 – IEC 62966-2:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 7

4 Determination of the air leak rate ..................................................................................... 9

4.1 Determination of the air leak rate of the individual components of an aisle

containment ............................................................................................................ 9

4.2 Components and system characteristic curves ...................................................... 10

4.2.1 General ......................................................................................................... 10

4.2.2 Equipment requirements ................................................................................ 11

4.3 Measurement procedure ....................................................................................... 11

4.3.1 Measurement conditions ................................................................................ 11

4.3.2 Preparing the elements of the test housing for measurement ......................... 11

4.3.3 Measurement of the air leak rate ................................................................... 13

4.4 Test report ............................................................................................................ 14

4.5 Measurement precision ......................................................................................... 14

5 Air leakage rate of the aisle containment – Creation of an overall system

characteristic curve for the aisle containment ................................................................ 15

6 Determination of the air leak rate – Determination of the air leak rate of the overall

system in operation, including the IT equipment ............................................................ 15

Annex A (informative) Aisle containments according to operation mode ............................... 17

A.1 Allocation of the aisle containments according to operation mode ......................... 17

A.1.1 General ......................................................................................................... 17

A.1.2 Types of climate control ................................................................................. 17

A.1.3 Closed-circuit climate control ......................................................................... 17

A.1.4 In-line climate control .................................................................................... 17

A.2 Cold aisle containment .......................................................................................... 18

A.2.1 Principle of the cold aisle containment ........................................................... 18

A.2.2 Objective of the cold aisle .............................................................................. 18

A.2.3 Climate control .............................................................................................. 18

A.3 Hot aisle containment ........................................................................................... 18

A.3.1 Principle of the hot aisle containment ............................................................ 18

A.3.2 Objective of the hot aisle ............................................................................... 19

A.3.3 Climate control .............................................................................................. 19

A.4 Cold and hot aisle containment ............................................................................. 19

A.4.1 Principle of the cold and hot aisle containment .............................................. 19

A.4.2 Objective of the cold aisle in a cold and hot aisle containment ....................... 20

A.4.3 Climate control .............................................................................................. 20

Annex B (informative) Thermodynamic variables within aisle containments .......................... 21

B.1 Air pressure .......................................................................................................... 21

B.1.1 General ......................................................................................................... 21

B.1.2 Minimum differential pressure ........................................................................ 21

B.1.3 Overpressure in hot aisle containments ......................................................... 21

B.1.4 Negative pressure in hot aisle containments .................................................. 21

B.1.5 Overpressure in cold aisle containments ........................................................ 21

B.1.6 Negative pressure in cold aisle containments ................................................ 21

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IEC 62966-2:2020 © IEC 2020 – 3 –

B.2 Directions of flow .................................................................................................. 22

B.2.1 Directions of flow "from the front to the back" ................................................ 22

B.2.2 Direction of flow "to the side" ......................................................................... 22

B.3 Flow velocities ...................................................................................................... 22

B.3.1 Closed-circuit climate control ......................................................................... 22

B.3.2 In-line climate control .................................................................................... 22

B.3.3 Design of the aisle containments ................................................................... 22

B.4 Temperatures and humidity ................................................................................... 23

B.4.1 General ......................................................................................................... 23

B.4.2 Temperatures ................................................................................................ 23

B.4.3 Humidity ........................................................................................................ 23

Bibliography .......................................................................................................................... 24

Figure 1 – Example of the components – Roof ........................................................................ 9

Figure 2 – Example of the components – Door ...................................................................... 10

Figure 3 – Example of the components – Enclosures ............................................................ 10

Figure 4 – Sealing the installation level ................................................................................. 12

Figure 5 – Example of a connecting design to the neighbouring enclosure ............................ 12

Figure 6 – Example of a connecting design to the roof .......................................................... 13

Figure 7 – Example of a connecting design to the end door .................................................. 13

Figure 8 – Example of component and system characteristic curves ..................................... 14

Figure 9 – Example of a hydraulic addition of individual characteristic curves ....................... 15

Figure 10 – Classification of aisle containment by class factors ............................................ 16

Figure A.1 – Example of an in-line climate control ................................................................. 17

Figure A.2 – Example of a cold aisle containment ................................................................. 18

Figure A.3 – Example of a hot aisle containment ................................................................... 19

Figure A.4 – Example of a cold and hot aisle containment .................................................... 20

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SIST EN IEC 62966-2:2020
– 4 – IEC 62966-2:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MECHANICAL STRUCTURES FOR
ELECTRICAL AND ELECTRONIC EQUIPMENT –
AISLE CONTAINMENT FOR IT CABINETS –
Part 2: Details of air flow, air separation and air cooling requirements
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62966-2 has been prepared by subcommittee 48D: Mechanical

structures for electrical and electronic equipment, of IEC technical committee 48: Electrical

connectors and mechanical structures for electrical and electronic equipment.
The text of this International Standard is based on the following documents:
FDIS Report on voting
48D/722/FDIS 48D/727/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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SIST EN IEC 62966-2:2020
IEC 62966-2:2020 © IEC 2020 – 5 –

A list of all parts in the IEC 62966 series, published under the general title Mechanical structures

for electrical and electronic equipment – Aisle containment for it cabinets, can be found on the

IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

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SIST EN IEC 62966-2:2020
– 6 – IEC 62966-2:2020 © IEC 2020
INTRODUCTION

Cabinets of the IEC 60297 and IEC 60917 standard series are used as enclosures of electronic

and electrical equipment in many different fields of application. A wide field of application is

represented by enclosures equipped with electronic information technology (IT) equipment.

They are frequently set up in large numbers in server rooms and data centres. During their

operation, the electronic equipment installed generates a considerable amount of heat that will

be removed from the equipment by means of cooling air. Precise adjustment of the supply air

temperature and a sufficient cooling air flow are indispensable prerequisites for the fail-safe

operation of equipment in information technology.

It is a common practice to set up cabinets in rows. The server cabinets along the rows are

usually arranged in such a way that surfaces with cold supply air inlets face each other across

an aisle, and surfaces with hot exhaust air outlets also face each other across an aisle. This

row configuration is generally known as hot aisle/cold aisle configuration. Moreover, air is

supplied and discharged exclusively via the front and rear panels of the server cabinets, which

are frequently perforated doors. It is assumed that inside the IT equipment, the cooling air is

moved in a horizontal direction, taking it in at the front and discharging it at the rear.

This part of IEC 62966 specifies the quantification of the air separation, in particular the air leak

rate that describes the content of the volumetric flow not used for cooling in the aisle

containment for information technology (IT) cabinets. The objective of this document is to

stipulate properties and requirements of aisle containment ensuring cost effective installation,

energy-efficient and user-friendly operation of IT equipment in data centres server rooms.

The fan pressurization method (overpressure at the system and elements) is used to categorize

the air tightness of the aisle containment. In doing so, it is used to quantify the air tightness, in

order to compare aisle containments with regard to the air tightness. It is also useful for finding

leaks, or to determine the improvement due to improving the air tightness. The fan

pressurization method cannot measure the air leak rate, but serves as a basis for determining

the air leak rate by calculation. The method can be used to determine air leak rates of the aisle

containment at low-pressure and overpressure on the inside compared with the surroundings.

Thus, this allows a categorization of the elements of an aisle containment – the enclosure – to

be determined.

For this purpose, aisle containment is dismantled into typical individual elements, for example

enclosures, doors and roof covers. The corresponding characteristic curves of these

components are recorded separately and added to the system characteristic curve of the aisle

containment.

The quality of the resulting aisle containment is then classified using a differential pressure

measurement.

The IEC 62966 series, Mechanical structures for electrical and electronic equipment – Aisle

containment for IT cabinets, is subdivided into the following parts:
• IEC 62966-1: Dimensions and mechanical requirements
• IEC 62966-2: Details of air flow, air separation and air cooling requirements

• IEC 62966-3: Aspects of operational safety of IT equipment and users of aisle containment

IEC 62966-1 defines geometric dimensions and mechanical properties ensuring undisturbed,

energy-efficient and user-friendly operation of the data centre.

IEC 62966-2 provides the methods and process to get the aisle containment air leakage and

define the classification (evaluation) system on the aisle containment air leakage, for designers

and users of aisle containments for IT cabinets based on the IEC 60297 and IEC 60917 series.

IEC 62966-3 deals with aspects of safely operating IT equipment in aisle containment, with

respect to special fire-protection and fire-fighting issues. It also describes the nature of the

doors for access to the aisle containment and possible access control.
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SIST EN IEC 62966-2:2020
IEC 62966-2:2020 © IEC 2020 – 7 –
MECHANICAL STRUCTURES FOR
ELECTRICAL AND ELECTRONIC EQUIPMENT –
AISLE CONTAINMENT FOR IT CABINETS –
Part 2: Details of air flow, air separation and air cooling requirements
1 Scope

This part of IEC 62966, dedicated to aisle containment techniques for information technology

(IT) equipment typically used in data centres, describes the quantification of its air tightness, in

particular the air loss ratio that describes the content of the volumetric flow not used for cooling

the IT equipment. This ratio provides an index of efficiency, being inversely proportional to

efficiency (the lower this ratio, the higher the efficiency). This document provides methods to

measure an aisle containment air leakage rate and defines a classification system for aisle

containment leakage.
This document defines:

a) the measurement of the air leakage of the individual components of an aisle containment;

b) a method for calculating the air leakage of an aisle containment based on its individual

components;

c) a method for calculating the air leakage rate of an aisle containment in relation to the utilised

IT equipment;
d) a classification system for aisle containment leakage.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.

IEC 62966-1, Mechanical structures for electrical and electronic equipment – Aisle containment

for IT equipment – Part 1: Dimensions and mechanical requirements

ISO 9972, Thermal performance of buildings – Determination of air permeability of buildings –

Fan pressurization method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
air leak rate

ratio of the volumetric air flow not used for cooling to the total volumetric air flow

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– 8 – IEC 62966-2:2020 © IEC 2020
3.2
aisle containment

boundary that separates the inner volume from the surroundings, usually comprising the base

(floor), access doors or end-piece on the front side, roof elements and containment doors of

the enclosure (cabinet), that contain the IT equipment
3.3
base

area bounded by the doors of the opposite-facing bayed enclosure

(cabinet) suites and the aisle doors or walls
3.4
doors

end piece of an aisle containment on both ends or on one end that

ensures access to the inside of the aisle containment
3.5
roof elements

upper construction of the aisle containment as an upper end piece

3.6
enclosure

server and network cabinets that accommodate IT equipment

3.7
inner volume

volumes of the aisle containment limited by doors, roof elements,

bases and enclosures
3.8
IT equipment

all (active) components that are installed in an enclosure

3.9
supply air

cooling air before entering the IT equipment and other IT related supporting systems, whose

temperature is suitable to absorb the heat flow from the equipment
3.10
supply air temperature
temperature of the supply air to the enclosures.
3.11
exhaust air
heated supply air after exiting the IT equipment that has absorbed the heat flow
3.12
exhaust air temperature
temperature of the exhaust air from the enclosures of an isle containment
3.13
cold aisle

area in front of the enclosures of an aisle containment that is supplied with the supply air

3.14
hot aisle

area behind the enclosures of an aisle containment into which the exhaust air flows

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SIST EN IEC 62966-2:2020
IEC 62966-2:2020 © IEC 2020 – 9 –
3.15
operation point

work point of the overall system at a specified time, set via the selected operating parameters

3.16
design point
operating parameters that are used as a basis for correct operation
3.17
air flow unit
...

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