Information technology - Data centre facilities and infrastructures - Part 4-2: Power Usage Effectiveness

This European Standard specifies the Power Usage Effectiveness (PUE) as a Key Performance Indicator (KPI) to quantify the efficient use of energy in the form of electricity. NOTE See the Note 1 to entry in Definition 3.1.3. This European Standard: a) defines the Power Usage Effectiveness (PUE) of a data centre; b) introduces PUE measurement categories; c) describes the relationship of this KPI to a data centre’s infrastructure, information technology equipment and information technology operations; d) defines the measurement, the calculation and the reporting of the parameter; e) provides information on the correct interpretation of the PUE. PUE derivatives are described in Annex C.

Informationstechnik - Einrichtungen und Infrastrukturen von Rechenzentren - Teil 4-2: Kennzahl zur eingesetzten Energie

Technologie de l’information - Installation et infrastructures de centres de traitement de données - Partie 4-2 : Efficacité de l'utilisation de l'énergie

La présente Norme européenne spécifie l’efficacité de l'utilisation de l'énergie (PUE - Power Usage Effectiveness) en tant qu’indicateur-clé de performance (KPI) pour mesurer l’efficacité de l’utilisation de l’énergie sous forme d’électricité. NOTE Voir la Note 1 à l'article de la Définition 3.1.3. La présente Norme européenne: a) définit l’efficacité de l'utilisation de l'énergie (PUE) d’un centre de traitement de données; b) introduit les catégories de mesure du PUE; c) décrit la relation de ce KPI avec une infrastructure de centre de traitement de données, des équipements de traitement de l’information et des opérations de traitement de l’information; d) définit le mesurage, le calcul et les rapports du paramètre; e) fournit des informations sur l’interprétation correcte du PUE. Les dérivés du PUE sont décrits dans l’Annexe C.

Informacijska tehnologija - Naprave in infrastruktura podatkovnih centrov - 4-2. del: Učinkovitost porabe energije

Ta evropski standard določa učinkovitost porabe energije (PUE) kot bistveni kazalnik učinkovitosti (KPI) za kvantifikacijo učinkovite porabe energije v obliki elektrike.
OPOMBA:   Glej opombo 1 glede vnosa v definiciji 3.1.3.
Ta evropski standard:
a)   določa učinkovitost porabe energije podatkovnega centra;
b)   uvaja merilne kategorije učinkovitosti porabe energije;
c)   opisuje razmerje tega bistvenega kazalnika učinkovitosti z infrastrukturo podatkovnega centra, opremo informacijske tehnologije in delovanjem informacijske tehnologije;
d)   opredeljuje merjenje, izračun in poročanje parametra;
e)   podaja informacije o pravilni interpretaciji učinkovitosti porabe energije.
Izpeljanke učinkovitosti porabe energije so opisane v dodatku C.

General Information

Status
Published
Publication Date
22-Dec-2016
Current Stage
6060 - Document made available
Due Date
23-Dec-2016
Completion Date
23-Dec-2016

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SLOVENSKI STANDARD
SIST EN 50600-4-2:2017
01-februar-2017
,QIRUPDFLMVNDWHKQRORJLMD1DSUDYHLQLQIUDVWUXNWXUDSRGDWNRYQLKFHQWURY
GHO8þLQNRYLWRVWSRUDEHHQHUJLMH

Information technology - Data centre facilities and infrastructures - Part 4-2: Power

Usage Effectiveness

Informationstechnik - Einrichtungen und Infrastrukturen von Rechenzentren - Teil 4-2:

Kennzahl zur eingesetzten Energie

Technologie de l’information - Installation et infrastructures de centres de traitement de

données - Partie 4-2 : Efficacité de l'utilisation de l'énergie
Ta slovenski standard je istoveten z: EN 50600-4-2:2016
ICS:
35.110 Omreževanje Networking
SIST EN 50600-4-2:2017 en,fr

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

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SIST EN 50600-4-2:2017
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SIST EN 50600-4-2:2017
EUROPEAN STANDARD EN 50600-4-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2016
ICS 35.020; 35.110; 35.160
English Version
Information technology - Data centre facilities and infrastructures
- Part 4-2: Power Usage Effectiveness

Technologie de l'information - Installation et infrastructures Informationstechnik - Einrichtungen und Infrastrukturen von

de centres de traitement de données - Partie 4-2 : Efficacité Rechenzentren - Teil 4-2: Kennzahl zur eingesetzten

de l'utilisation de l'énergie Energie

This European Standard was approved by CENELEC on 2016-10-10. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels

© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 50600-4-2:2016 E
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EN 50600-4-2:2016
Contents Page
European foreword 5

Introduction ......................................................................................................................................................... 6

1 Scope ..................................................................................................................................................... 9

2 Normative references ............................................................................................................................. 9

3 Terms, definitions and abbreviations ..................................................................................................... 9

3.1 Terms and definitions ............................................................................................................................. 9

3.2 Abbreviations ........................................................................................................................................ 10

3.3 Symbols ................................................................................................................................................ 11

4 Applicable area of the data centre ....................................................................................................... 11

5 Determination of Power Usage Effectiveness ...................................................................................... 12

5.1 General ................................................................................................................................................. 12

5.2 Total data centre energy consumption ................................................................................................. 12

5.3 Total data centre energy consumption in mixed-use buildings ............................................................ 13

6 Measurement of Power Usage Effectiveness ...................................................................................... 13

6.1 Measuring energy consumption ........................................................................................................... 13

6.1.1 General.............................................................................................................................................. 13

6.1.2 Measurement period and frequency ................................................................................................. 13

6.1.3 Meter and measurement requirements ............................................................................................. 13

6.2 Categories of Power Usage Effectiveness ........................................................................................... 14

6.2.1 General.............................................................................................................................................. 14

6.2.2 Category 1 (PUE ) – basic resolution ............................................................................................... 14

6.2.3 Category 2 (PUE ) – intermediate resolution ................................................................................... 15

6.2.4 Category 3 (PUE ) – advanced resolution ....................................................................................... 15

6.2.5 Measurement placement................................................................................................................... 15

7 Reporting of Power Usage Effectiveness ............................................................................................ 15

7.1 Requirements ....................................................................................................................................... 15

7.1.1 Standard construct for communicating PUE data ............................................................................. 15

7.1.2 Example of reporting PUE values ..................................................................................................... 15

7.1.3 Data for public reporting PUE ........................................................................................................... 16

7.2 Recommendations ............................................................................................................................... 16

7.2.1 Use of PUE Category ........................................................................................................................ 16

7.2.2 Trend tracking data ........................................................................................................................... 16

Annex A (normative) Energy measurements .................................................................................................. 18

A.1 Measuring energy and calculating Power Usage Effectiveness .......................................................... 18

A.2 Measurement locations ........................................................................................................................ 18

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A.3 Assessment frequencies ...................................................................................................................... 19

Annex B (informative) Calculation of PUE using various energy supplies ...................................................... 20

B.1 Examples of PUE calculation with various energy supplies................................................................. 20

B.2 Examples of PUE calculation with cogeneration using electricity and natural gas .............................. 21

B.3 Examples of PUE calculation with absorption type chiller ................................................................... 22

Annex C (normative) PUE derivatives ............................................................................................................. 24

C.1 General ................................................................................................................................................. 24

C.1.1 Purpose of PUE derivatives .............................................................................................................. 24

C.1.2 Using PUE derivatives ...................................................................................................................... 24

C.2 Interim PUE .......................................................................................................................................... 25

C.3 Partial PUE (pPUE) .............................................................................................................................. 25

C.3.1 General.............................................................................................................................................. 25

C.3.2 Zoning ............................................................................................................................................... 26

C.3.3 Metering requirements for pPUE ...................................................................................................... 27

C.3.4 Reporting of pPUE ............................................................................................................................ 27

C.3.5 Use of pPUE in energy management ............................................................................................... 28

C.3.6 Use of pPUE in mixed use buildings ................................................................................................. 28

C.4 Designed PUE ...................................................................................................................................... 29

Annex D (informative) Interpretation of PUE and its derivatives ..................................................................... 32

D.1 General ................................................................................................................................................. 32

D.2 Data centre infrastructure versus IT equipment ................................................................................... 32

D.3 Comparing PUE results between data centres .................................................................................... 33

Bibliography ...................................................................................................................................................... 34

Figures

Figure 1 — Schematic relationship between the EN 50600 series of documents ............................................. 7

Figure A.1 — Schematic of PUE calculation from measurements ................................................................... 18

Figure A.2 — Monitoring and measurement points .......................................................................................... 19

Figure B.1 — Example for a data centre purchasing all electricity................................................................... 20

Figure B.2 — Example for a data centre purchasing electricity and chilled water ........................................... 20

Figure B.3 — Example for a data centre purchasing natural gas .................................................................... 21

Figure B.4 — Example for a data centre purchasing electricity and natural gas ............................................. 21

Figure B.5 — Method 1: Measured by chilled water flow ................................................................................. 22

Figure B.6 — Method 2: Calculated from energy required to produce chilled water ....................................... 22

Figure B.7 — Method 1: Measured by chilled water flow ................................................................................. 22

Figure B.8 — Method 2: Measured by input gas .............................................................................................. 23

Figure C.1 — Zoning for a data centre ............................................................................................................. 26

Figure C.2 — Zoning for a data centre using DX cooling ................................................................................. 27

Figure C.3 — Zoning for a data centre using water ......................................................................................... 27

Figure C.4 — Example of utilizing the combination of PUE derivatives: ipPUE .............................................. 28

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Tables

Table 1 — PUE Categories .............................................................................................................................. 14

Table 2 — Examples of PUE reporting ............................................................................................................ 15

Table C.1 — Example of dPUE calculation ...................................................................................................... 30

Table C.2 — Example of context description ................................................................................................... 31

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European foreword

This document (EN 50600-4-2:2016) has been prepared by CLC/TC 215 “Electrotechnical aspects of

telecommunication equipment”.
The following dates are fixed:
· latest date by which this document has (dop) [2017-07-10]
to be implemented at national level by
publication of an identical national
standard or by endorsement
· latest date by which the national (dow) [2019-10-10]
standards conflicting with this
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 [and/or CEN] shall not be held responsible for identifying any or all such patent rights.

This document has been prepared under a mandate given to CENELEC by the European Commission and

the European Free Trade Association.
Regarding the various parts in the EN 50600 series, see the Introduction.
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Introduction

The unrestricted access to internet-based information demanded by the information society has led to an

exponential growth of both internet traffic and the volume of stored/retrieved data. Data centres are housing

and supporting the information technology and network telecommunications equipment for data processing,

data storage and data transport. They are required both by network operators (delivering those services to

customer premises) and by enterprises within those customer premises.

Data centres need to provide modular, scalable and flexible facilities and infrastructures to easily

accommodate the rapidly changing requirements of the market. In addition, energy consumption of data

centres has become critical both from an environmental point of view (reduction of carbon footprint) and with

respect to economic considerations (cost of energy) for the data centre operator.

The implementation of data centres varies in terms of:

a) purpose (enterprise, co-location, co-hosting, or network operator facilities);

b) security level;
c) physical size;
d) accommodation (mobile, temporary and permanent constructions).

The needs of data centres also vary in terms of availability of service, the provision of security and the

objectives for energy efficiency. These needs and objectives influence the design of data centres in terms of

building construction, power distribution, environmental control and physical security. Effective management

and operational information is required to monitor achievement of the defined needs and objectives.

This series of European Standards specifies requirements and recommendations to support the various

parties involved in the design, planning, procurement, integration, installation, operation and maintenance of

facilities and infrastructures within data centres. These parties include:
1) owners, facility managers, ICT managers, project managers, main contractors;

2) architects, consultants, building designers and builders, system and installation designers;

3) facility and infrastructure integrators, suppliers of equipment;
4) installers, maintainers.

At the time of publication of this European Standard, the EN 50600 series will comprise the following

standards and documents:

— EN 50600-1, Information technology — Data centre facilities and infrastructures — Part 1: General

concepts;

— EN 50600-2-1, Information technology — Data centre facilities and infrastructures — Part 2-1: Building

construction;

— EN 50600-2-2, Information technology — Data centre facilities and infrastructures — Part 2-2: Power

distribution;

— EN 50600-2-3, Information technology — Data centre facilities and infrastructures — Part 2-3:

Environmental control;

— EN 50600-2-4, Information technology — Data centre facilities and infrastructures — Part 2-4:

Telecommunications cabling infrastructure;
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— EN 50600-2-5, Information technology — Data centre facilities and infrastructures — Part 2-5: Security

systems;

— EN 50600-3-1, Information technology — Data centre facilities and infrastructures — Part 3-1:

Management and operational information;

— EN 50600-4-1, Information technology — Data centre facilities and infrastructures — Part 4-1: Overview

of and general requirements for key performance indicators;

— EN 50600-4-2, Information technology — Data centre facilities and infrastructures — Part 4-2: Power

Usage Effectiveness;

— EN 50600-4-3, Information technology — Data centre facilities and infrastructures — Part 4-3:

Renewable Energy Factor;

— CLC/TR 50600-99-1, Information technology — Data centre facilities and infrastructures — Part 99-1:

Recommended practices for energy management.

The inter-relationship of the standards within the EN 50600 series is shown in Figure 1.

Figure 1 — Schematic relationship between the EN 50600 series of documents

EN 50600-2-X standards specify requirements and recommendations for particular facilities and

infrastructures to support the relevant classification for “availability”, “physical security” and “energy efficiency

enablement” selected from EN 50600-1.

EN 50600-3-X documents specify requirements and recommendations for data centre operations, processes

and management.

EN 50600-4-X documents specify requirements and recommendations for key performance indicators (KPIs)

used to assess and improve the resource usage efficiency and effectiveness, respectively, of a data centre.

In today’s digital society data centre growth, and power consumption in particular, is an inevitable

consequence and that growth will demand increasing power consumption despite the most stringent energy

efficiency strategies. This makes the need for key performance indicators that cover the effective use of

resources (including but not limited to energy) and the reduction of CO emissions essential.

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NOTE Within the EN 50600–4-X series, the term “resource usage effectiveness” is more generally used for KPIs in

preference to “resource usage efficiency”, which is restricted to situations where the input and output parameters used to

define the KPI have the same units.

In order to enable the optimum resource effectiveness of data centres a suite of effective KPIs is needed to

measure and report on resources consumed in order to develop an improvement roadmap.

These standards are intended to accelerate the provision of operational infrastructures with improved

resource usage effectiveness.

This European Standard specifies Power Usage Effectiveness (PUE), which has become a popular metric to

determine the efficient utilization and distribution of energy resources within a data centre.

It is recognized that the term “efficiency” should be employed for PUE but “effectiveness” provides continuity

with earlier market recognition of the term.

Additional standards in the EN 50600-4-X series will be developed, each describing a specific KPI for

resource usage effectiveness or efficiency.

The EN 50600-4-X series does not specify limits or targets for any KPI and does not describe or imply,

unless specifically stated, any form of aggregation of individual KPIs into a combined nor an overall KPI for

data centre resource usage effectiveness or efficiency.

This European Standard is intended for use by and collaboration between data centre managers, facility

managers, ICT managers, and main contractors.

This series of European Standards does not address the selection of information technology and network

telecommunications equipment, software and associated configuration issues.
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1 Scope

This European Standard specifies the Power Usage Effectiveness (PUE) as a Key Performance Indicator

(KPI) to quantify the efficient use of energy in the form of electricity.
NOTE See the Note 1 to entry in Definition 3.1.3.
This European Standard:
a) defines the Power Usage Effectiveness (PUE) of a data centre;
b) introduces PUE measurement categories;

c) describes the relationship of this KPI to a data centre’s infrastructure, information technology equipment

and information technology operations;
d) defines the measurement, the calculation and the reporting of the parameter;
e) provides information on the correct interpretation of the PUE.
PUE derivatives are described in Annex C.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

EN 50600-1, Information technology — Data centre facilities and infrastructures — Part 1: General concepts

EN 50600-4-1:2016, Information technology — Data centre facilities and infrastructures — Part 4-1:

Overview of and general requirements for key performance indicators

EN 62052 (all parts), Electricity metering equipment (AC) — General requirements, tests and test conditions

(IEC 62052 series)

EN 62053 (all parts), Electricity metering equipment (a.c.) — Particular requirements (IEC 62053 series)

3 Terms, definitions and abbreviations
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 50600-1 and the following apply.

3.1.1
information technology equipment energy consumption

energy consumed, measured in kilowatt-hour (kWh), by equipment that is used to store, process, and

transport data within the computer room, telecommunication room and control room spaces

Note 1 to entry: Examples are servers, storage equipment and telecommunications equipment.

3.1.2
power distribution unit

equipment that allocates or partitions power for other energy consuming equipment

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3.1.3
Power Usage Effectiveness

ratio of the data centre total energy consumption to information technology equipment energy consumption,

calculated, measured or assessed across the same period

Note 1 to entry: It is recognized that the term “efficiency” should be employed for PUE but “effectiveness” provides

continuity with earlier market recognition of the term.

Note 2 to entry: Sometimes the inverse value of PUE, referred to as Data Centre Infrastructure Efficiency (DCiE), is

used.
3.1.4
partial Power Usage Effectiveness

derivative of PUE, which is the ratio of the total energy consumption within a defined boundary to the

information technology equipment energy consumption
3.1.5
designed Power Usage Effectiveness

derivative of PUE, which is a projected PUE determined by the design targets of the data centre

3.1.6
interim Power Usage Effectiveness
derivative of PUE, which is measured over a specified time other than a year
3.1.7
total annual data centre energy consumption

total energy consumption for all energy types serving the data centre, measured in kWh at its boundary

Note 1 to entry: Energy is measured with energy metering devices at the boundary of the data centre or points of

generation within the boundary.

Note 2 to entry: This includes electricity, natural gas and district utilities such as supplied chilled water or condenser

water.
Note 3 to entry: Total annual energy includes supporting infrastructure.
3.2 Abbreviations

For the purposes of this document, the abbreviations given in EN 50600-4-1 and the following apply.

CRAC Computer Room Air Conditioner/Conditioning
CRAH Computer Room Air Handler units
dPUE designed Power Usage Effectiveness
DX Direct Expansion
idPUE interim designed Power Usage Effectiveness
iPUE interim Power Usage Effectiveness
PDU Power Distribution Unit
pPUE partial Power Usage Effectiveness
PUE Power Usage Effectiveness
r.m.s. root mean square
ROI Return On Investment
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3.3 Symbols
For the purposes of this document the following symbols apply.
E total data centre energy consumption (annual) in kWh
E IT equipment energy consumption (annual) in kWh
4 Applicable area of the data centre
Power Usage Effectiveness (PUE) as specified in this standard:
a) is associated with the data centre infrastructure within its boundaries only;

b) describes the infrastructure's energy efficiency relative to facilities with given environmental conditions,

IT load characteristics, availability requirements, maintenance, and security requirement;

c) illustrates the energy allocation of a data centre.

When viewed in the proper context, PUE provides effective guidance and useful insight into the design of

efficient power and cooling architectures, the deployment of equipment within those architectures, and the

operation of that equipment.
PUE provides a means to determine:

1) opportunities for the improvement of the operational efficiency of a data centre;

2) the improvement of the designs and processes of a data centre over time;

3) a design target or goal for new data centres across the anticipated IT load range.

PUE does not take into account the:
— energy efficiency of the IT load, its utilization or productivity;
— efficiency of on-site electricity generation;
— efficiency of other resources such as human resource, space or water;

— use of renewable energy resources or accounts for re-use of waste by-products (such as heat).

PUE is not a:
• data centre productivity metric,
• a standalone, comprehensive resource efficiency metric.

Derivatives of PUE which are useful in certain circumstances are described in Annex C. PUE should not be

used to compare different data centres.
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5 Determination of Power Usage Effectiveness
5.1 General
PUE is defined as:
PUE = (1)
where
E = total data centre energy consumption (annual) in kWh;
E = IT equipment energy consumption (annual) in kWh.
By definition, the calculated PUE is always greater than 1.

Where the only energy source is from the electrical utility, then E is determined by the location of the

utility meter. PUE may be applied in mixed use buildings that allow of the differentiation between the energy

used for the data centre and that for other functions. Alternatively, the derivative partial PUE (pPUE) may be

applied (see Annex C).
E includes but is not limited to:
a) IT equipment (e.g. storage, processing and transport equipment);

b) supplemental equipment (e.g. keyboard/video/mouse (KVM) switches, monitors, and

workstations/laptops used to monitor, manage, and/or control the data centre).

E includes E plus all the energy that is consumed to support the following infrastructures:

DC IT

1) power delivery - including UPS systems, switchgear, generators, power distribution units (PDUs),

batteries, and distribution losses external to the IT equipment;

2) cooling system - including chillers, cooling towers, pumps, computer room air handling units (CRAHs),

computer room air conditioning units (CRACs), and direct expa
...

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