# SIST EN 17038-1:2019

(Main)## Pumps - Methods of qualification and verification of the Energy Efficiency Index for rotodynamic pumps units - Part 1: General requirements and procedures for testing and calculation of energy efficiency index (EEI)

## Pumps - Methods of qualification and verification of the Energy Efficiency Index for rotodynamic pumps units - Part 1: General requirements and procedures for testing and calculation of energy efficiency index (EEI)

This document covers pump units consisting of:

- one single or several rotodynamic water pump(s), including where integrated in other products, and driven by a motor system, consisting of an electrical motor and

- either a terminal box which only enables to operate the pump unit at constant motor stator frequency and thereby (nearly) constant rotational speed,

- or a CDM (Complete Drive Module) which enables to operate the pump unit at variable rotational speed depending on a varying demand of flow rate and/or discharge or differential pressure.

NOTE 1 A motor system which consists of an electric motor and a CDM is also called PDS (Power Drive System).

NOTE 2 A CDM is also often called VSD (Variable Speed Drive).

Pump units as defined above are treated as extended products in respect to their energy efficiency.

## Pumpen - Methoden zur Qualifikation und Verifikation des Energieeffizienzindexes für Kreiselpumpen - Teil 1: Allgemeine Anforderungen und Vorgehensweisen zur Prüfung und Berechnung des Energieeffizienzindexes (EEI)

Dieses Dokument beschreibt die Methodik, die Energie-Effizienz Leistung von Pumpenaggregaten auf der Basis einer dimensionslosen, numerischen Größe zu bewerten, die Energieeffizienzindex (EEI) genannt wird.

Dieses Dokument behandelt Pumpenaggregate, bestehend aus:

- einer einzelnen oder mehreren Kreiselpumpe(n) für Wasser, auch wenn sie in andere Produkte integriert sind, angetrieben von einem Motorsystem aus einem Elektromotor und

- entweder einem Kabelabschlusskasten, der nur den Betrieb des Pumpenaggregats bei konstanter Frequenz des Stators und daher (nahezu) konstanter Drehzahl ermöglicht,

- oder einem vollständigen Antriebsmodul (CDM, en: Complete Drive Module), das den Betrieb des Pumpenaggregats bei variabler Drehzahl entsprechend des schwankenden Bedarfsvolumenstroms und/oder der Entnahme bzw. des Differenzdrucks erlaubt.

ANMERKUNG Ein CDM wird oftmals auch drehzahlgeregelter Antrieb (VSD, en: Variable Speed Drive) genannt.

Pumpenaggregate entsprechend der obenstehenden Definition werden hinsichtlich ihrer Energieeffizienz als erweiterte Produkte behandelt.

## Pompes - Méthodes de qualification et de vérification de l'indice de rendement énergétique des groupes motopompes rotodynamiques - Partie 1 : Exigences générales et procédures d'essai et de calcul de l'indice de rendement énergétique (EEI)

Le présent document s'applique aux groupes motopompes constitués des éléments suivants :

- une ou plusieurs pompe(s) à eau rotodynamique(s), intégrée(s) ou non dans d'autres produits et entraînée(e) par un système motorisé comprenant un moteur électrique ; et

- soit une boîte à bornes permettant simplement de faire fonctionner le groupe motopompe à une fréquence constante du stator de moteur et donc à une vitesse de rotation (quasi-)constante ;

- soit un module d'entraînement complet permettant de faire fonctionner le groupe motopompe à une vitesse de rotation variable en fonction des différents besoins de débit et/ou de décharge ou de pression différentielle.

NOTE 1 Un système motorisé constitué d'un moteur électrique et d'un module d'entraînement complet est également appelé « système d'entraînement électrique ».

NOTE 2 Un module d'entraînement complet est également appelé souvent « entraînement à vitesse variable ».

Les groupes motopompes, tels qu'ils sont définis ci-dessus, sont considérés comme des produits globaux au regard de leur rendement énergétique.

## Črpalke - Metode za kvalifikacijo in verifikacijo indeksa energijske učinkovitosti centrifugalnih črpalk - 1. del: Splošne zahteve in postopki za preskušanje in izračun indeksa energijske učinkovitosti (EEI)

Ta dokument zajema črpalke, sestavljene iz:

– ene ali več centrifugalnih vodnih črpalk, vključno z vgrajenimi črpalkami v ostalih proizvodih, pri čemer jih poganja motorni sistem, ki je sestavljen iz električnega motorja in

– priključne omarice, ki samo omogoča obratovanje črpalke s stalno statorsko frekvenco motorja in posledično (skoraj) stalno vrtilno hitrostjo,

– ali celovitega pogonskega modula (CDM), ki omogoča obratovanje črpalke pri spremenljivi vrtilni hitrosti glede na spreminjajoče se zahteve pretoka in/ali praznjenja ali diferenčnega tlaka.

OPOMBA 1: Motorni sistem, ki je sestavljen iz električnega motorja in celovitega pogonskega modula, se imenuje tudi pogonski sistem (PDS).

OPOMBA 2: Celovit pogonski modul se pogosto imenuje tudi pogon s spremenljivo hitrostjo (VSD).

Črpalke, kot so opredeljene zgoraj, se v zvezi z energetsko učinkovitostjo obravnavajo kot razširjeni proizvodi.

### General Information

### Relations

### Standards Content (Sample)

SLOVENSKI STANDARD

SIST EN 17038-1:2019

01-julij-2019

Črpalke - Metode za kvalifikacijo in verifikacijo indeksa energijske učinkovitosti

centrifugalnih črpalk - 1. del: Splošne zahteve in postopki za preskušanje in

izračun indeksa energijske učinkovitosti (EEI)

Pumps - Methods of qualification and verification of the Energy Efficiency Index for

rotodynamic pumps units - Part 1: General requirements and procedures for testing and

calculation of energy efficiency index (EEI)

Pumpen - Methoden zur Qualifikation und Verifikation des Energieeffizienzindexes für

Kreiselpumpen - Teil 1: Allgemeine Anforderungen und Vorgehensweisen zur Prüfung

und Berechnung des Energieeffizienzindexes (EEI)

Pompes - Méthodes de qualification et de vérification de l'indice de rendement

énergétique des groupes motopompes rotodynamiques - Partie 1 : Exigences générales

et procédures d'essai et de calcul de l'indice de rendement énergétique (EEI)

Ta slovenski standard je istoveten z: EN 17038-1:2019

ICS:

23.080 Črpalke Pumps

27.015 Energijska učinkovitost. Energy efficiency. Energy

Ohranjanje energije na conservation in general

splošno

SIST EN 17038-1:2019 en,fr,de

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

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SIST EN 17038-1:2019

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SIST EN 17038-1:2019

EN 17038-1

EUROPEAN STANDARD

NORME EUROPÉENNE

May 2019

EUROPÄISCHE NORM

ICS 23.080

English Version

Pumps - Methods of qualification and verification of the

Energy Efficiency Index for rotodynamic pump units - Part

1: General requirements and procedures for testing and

calculation of Energy Efficiency Index (EEI)

Pompes - Méthodes de qualification et de vérification Pumpen - Methoden zur Qualifikation und Verifikation

de l'indice de rendement énergétique des groupes des Energieeffizienzindexes für Kreiselpumpen - Teil 1:

motopompes rotodynamiques - Partie 1 : Exigences Allgemeine Anforderungen und Vorgehensweisen zur

générales et procédures d'essai et de calcul de l'indice Prüfung und Berechnung des Energieeffizienzindexes

de rendement énergétique (EEI) (EEI)

This European Standard was approved by CEN on 15 July 2018.

CEN 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 CEN

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 CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION

COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17038-1:2019 E

worldwide for CEN national Members.

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

Contents Page

European foreword . 3

Introduction . 4

1 Scope . 5

2 Normative references . 5

3 Terms and definitions, symbols and subscripts . 5

4 Energy Efficiency Index (EEI) calculations . 9

4.1 General information and explanation on EEI . 9

4.2 Weighted-average value of the electric power input . 9

4.3 The reference electric power input P . 10

1, ref

5 Qualification of pump unit types in respect to their Energy Efficiency Index . 10

5.1 General remarks . 10

5.2 Qualification methods . 11

6 Verification of the Energy Efficiency Index for pump units . 12

6.1 General remarks . 12

6.2 Procedure and decision . 12

Annex A (informative) Mean value and confidence interval of the Energy Efficiency Index EEI . 14

Annex B (informative) Methods recommended for the qualification of a pump unit type by

test . 19

B.1 General remarks . 19

B.2 Determination of the mean value of EEI of a pump unit type population from a test

on only one test pump unit . 19

B.3 Determination of the mean value of EEI of a pump unit type population from a

sample test of M pump units . 20

Annex C (informative) Application of mathematical statistics on tests . 23

C.1 Purposes of applying statistics in the frame of qualification and verification . 23

C.2 Normal or Gaussian distribution . 23

C.3 Confidence interval . 24

C.4 Outlier test . 25

Annex D (informative) Measurement uncertainties . 27

Annex E (informative) The probability of the result of the verification procedure . 30

E.1 General . 30

E.2 Probability that the conformity to law is confirmed by verification tests . 32

E.3 Probability that a numerical value of indicated by the responsible company is

confirmed by verification tests . 33

Bibliography . 34

2

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

European foreword

This document (EN 17038-1:2019) has been prepared by Technical Committee CEN/TC 197 “Pumps”,

the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by November 2019, and conflicting national standards

shall be withdrawn at the latest by November 2019.

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

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

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.

3

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

Introduction

This document is the first part of a series of standards describing a methodology to evaluate energy

efficiency performance of pump units, comprising the pump, the motor with or without frequency

converter, based on a non-dimensional numerical value called Energy Efficiency Index (EEI). An EEI

allows the comparison of different pump sizes and types with one common indicator. Physical

influences such as pump size, specific speed, pump unit part-load operation, motor-efficiency

characteristic and frequency converter influence are implemented into this indicator.

This standard series covers pump units which component wise can be placed on the market and

assembled into a pump unit or are placed on the market as one single product. To cover these two cases

a semi-analytical model has been developed in order to derive the EEI based on nominal data of the

components only. This case happens for example when an assembler of the components builds the

pump unit on site and consequently a product test cannot be done by for this assembler or when a

manufacturer is quoting a pump-unit which uses a combination of components not previously built.

This particular standard gives an overview of the basic concept of EEI (Clause 4), basic concepts of flow-

time profiles and reference pressure control curves, the qualification (Clause 5) of a pump unit type

regarding an EEI and the verification of EEI values (Clause 6) given for a pump unit type either by

measurement or calculation.

Specific requirements for testing, a calculation method for an EEI, the so called semi-analytical model of

a complete pump unit, specific flow-time profiles and reference control curves are given in the

subsequent parts of this standard series.

4

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

1 Scope

This document describes a methodology to evaluate energy efficiency performance of pump units based

on a non-dimensional numerical value called Energy Efficiency Index (EEI).

This document covers pump units consisting of:

— one single or several rotodynamic water pump(s), including where integrated in other products,

and driven by a motor system, consisting of an electrical motor, and either:

— a terminal box which only enables to operate the pump unit at constant motor stator frequency

and thereby (nearly) constant rotational speed, or

— a CDM (Complete Drive Module) which enables to operate the pump unit at variable rotational

speed depending on a varying demand of flow rate and/or discharge or differential pressure.

NOTE A CDM is also often called VSD (Variable Speed Drive).

Pump units as defined above are treated as extended products in respect to their energy efficiency.

2 Normative references

There are no normative references in this document.

3 Terms and definitions, symbols and subscripts

For the purpose 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

fixed speed

constant motor stator frequency

3.2

variable speed

varying motor stator frequency

3.3

Energy Efficiency Index

EEI

ratio between P and P

1, avg 1, ref

3.4

reference electrical power input P

1, ref

calculated power input of the pump unit at the best efficiency point

3.5

average electrical power input P

1, avg

power input weighted by the load profile

5

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

3.6

pump unit

pump driven by a motor system

3.7

motor system

combination of an electric motor and either a terminal box or a CDM

3.8

pump unit type

identical pump units of the same configuration

3.9

pressure control curve

functional dependency of the demanded head H vs. the delivered flow rate Q in the form of a non-

dimensional correlation H/H = f (Q/Q )

100% 100%

3.10

reference pressure control curve

pre-defined functional dependency H/H = f (Q/Q ) for standardized measurements and

100% 100%

calculations of average power input P

1, avg

3.11

Complete Drive Module

CDM

electronic power converter connected between the electric supply and a motor as well as extensions

such as protection devices, transformers and auxiliaries

[SOURCE: EN 61800-2]

3.12

Power Drive System

PDS

combination of CDM and motor

6

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

Table 1 — List of basic letters and subscripts

Symbol Quantity Unit

C Constant dimensionless number

D Diameter m

e Measurement uncertainty, relative value dimensionless number

E Overall measurement uncertainty dimensionless number

−1

f Frequency

s , Hz

2

g Acceleration due to gravity

m/s

H Pump total head m

k Number of sample pumps dimensionless number

m Mass kg

M Number of pumps in a sample dimensionless number

−1 −1

n Speed of rotation

s , min

N Number of instrument readings dimensionless number

n Specific speed min−1

s

p Pressure Pa

p Probability density dimensionless number

P Power W

3

Q (Volume) rate of flow

m /s

s Standard deviation of a sample according to special quantity

t Tolerance factor, relative value dimensionless number

t Time s

t Student’s factor dimensionless number

T Torque Nm

u Peripheral velocity m/s

U Mean velocity m/s

U Voltage V

v Local velocity m/s

3

V Volume

m

x General quantity according to specified usage

y General quantity according to specified usage

z Height above reference plane m

z number of produced pumps dimensionless number

η Efficiency dimensionless number

θ Temperature °C

2

ν Kinematic viscosity

m /s

3

ρ Density

kg/m

ω Angular velocity rad/s

σ Standard deviation of normal distribution according to special quantity

7

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

Table 2 — List of letters and figures used as subscripts

Subscript Meaning

1 electrical

2 mechanical

abs absolute

allowable permitted e.g. by regulations

declared indicated by the manufacturer

verification permitted in verification process

individual specific to one pump unit

amb ambient

annual per year

BEP best efficiency point

dr drive

D datum

exp experimentally determined

G guaranteed

H pump total head

I numbering index

J numbering index

imp impeller

man manufacturing

max maximum permissible

mean arithmetic mean value

meas measured value

min, requ minimum required

N nominal

OL overload

Pd pre-defined

P power

PL part load

Q (volume) flow rate

R random

S specific, systematic

sync synchronous

tot total, overall

true true value

T torque

v vapour

x of quantity x

y % for probability of y %

8

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

4 Energy Efficiency Index (EEI) calculations

4.1 General information and explanation on EEI

The ratio of P and P is a quantitative indicator for the energy efficiency of pump units. It is

1, avg 1, ref

called Energy Efficiency Index (EEI) and is defined by Formula (1):

P

1, avg

(1)

EEI=

P

1,ref

is compared

In order to assess the efficiency of pump units, their actual electrical power input P

1, avg

with a reference value called P . It is a nominal power input of a fictitious pump unit running at

1, ref

nominal 100 % point.

The value of P for the different pump types are defined in other parts of this standard.

1, ref

The declared EEI value is based on the actual pump curves whether these are realized with full

diameter impeller, a trimmed impeller or a power limited curve.

NOTE Contrary to the efficiency values η of the unit components, the lower the numerical value of EEI, the

better the energy efficiency of pump units.

4.2 Weighted-average value of the electric power input

The quantification of energy efficiency of pump units should be based on the weighted average of

electrical power input P .

1, avg

The weighting factor when averaging the electrical power input P is the fraction of operating time at

1

the respective flow rate. Generally, for any application there is a continuous function describing the

dependency of (differential) time fraction dt/t on the relative flow rate Q/Q where t is the

tot 100 % tot

total operating time and Q is defined in the specific parts of this standard.

100 %

For the assessment of the energy efficiency of pump units, common and standardized “flow-time

profiles” are needed as basis for indicating their energy efficiency. The flow-time profile is defined for

each pump type in other parts of this standard.

In order to simplify further the determination of a value which characterizes the energy efficiency of

pump units, in this document the different flow-time profiles are described by a limited number of

points, not by a continuous curve or function. These discrete points are pairs of values of Q/Q and

100 %

Δt/t . These values define the discretised flow-time profiles. They are given as reference flow-time

tot

profiles in the specific parts of this standard. (In this case, Δt is a finite fraction of operating time and

Q/Q is the average value of relative flow rate demanded within this time fraction.)

100 %

NOTE 1 The reference flow-time profiles defined in this document for variable flow operation reflect the

typical ranges and variations of demanded flow rate in these types of applications and are based on experimental

field studies, see [1], [2].

9

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

For a given reference flow-time profile, the weighted average of the electric power input P is

1, avg

calculated by Formula (2):

N

∆t

P = ⋅ P (2)

1,avg

∑ 1, i

t

tot

i=1i

where

i is the consecutive number of the points of the flow-time profile and N is the total number of the

points of the flow-time profile.

For calculating P , the electric power input P shall be known for each value Q/Q of the

1, avg 1 100 %

reference flow-time profile.

But as for the flow-time profiles, common and standardized correlations H/H = f (Q/Q ) are

100 % 100 %

needed as basis for indicating and comparing the energy efficiency of pump units placed on the market

and/or put into service as extended products. These standardized correlations H/H = f (Q/Q )

100 % 100 %

are called reference pressure control curves in this document and are defined in subsequent parts of

this standard.

For calculating P in the case of variable speed operation, the electric power input P shall be

1, avg 1

determined at the relative flow rate values Q/Q of the relevant reference load-flow profile and for

100 %

the corresponding rotational speed n.

NOTE 2 Especially at low values of Q/Q the electric power input P is considerably higher for pump units

100 % 1

operated at constant motor stator frequency than for speed controlled pump units. This holds true independently

of the actual pressure control curve.

4.3 The reference electric power input P

1, ref

For assessing the energy efficiency of pump units within the scope of this document, a non-dimensional

value is needed which directly reflects the energy efficiency of pump units. The numerical magnitude of

this value shall be independent of parameters which influence the unit component's efficiency such as,

for example, their geometrical size and nominal power. For this purpose, the actual electrical power

input P averaged according to Formula (1) is divided by an appropriate reference value P . This

1, avg 1, ref

reference value shall:

— have a physical basis;

— consider relevant influences on the electrical power input of pump units;

— be independent from the efficiency related quality of individual components of the pump unit.

The chosen definitions of P which fulfil these requirements are given in other parts of this standard.

1, ref

5 Qualification of pump unit types in respect to their Energy Efficiency Index

5.1 General remarks

The qualification of a pump unit type in respect to the Energy Efficiency Index (EEI) is the responsibility

of the company which places it on the market and/or puts it into service.

Product information on EEI of a pump unit type can either state the (legally) required EEI in the format

“EEI ≤ 0.XX” or can indicate a lower value “EEI ≤ 0.YY” if the pump unit type is qualified for that and the

manufacturer decides so. EEI values shall be rounded to two decimal places.

10

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

5.2 Qualification methods

Generally, the method which is applied to determine the EEI-value in the frame of the qualification

procedure is left to the company which is responsible.

In this document, two methods of qualification are described. Both methods result in a high probability

of a successful verification:

1) Tests on complete pump units and evaluation of the test results to determine the EEI-value.

2) Determination of the EEI-value by applying a semi-analytical model of the complete pump unit.

These methods are described in detail in specific parts of this standard for the respective types of pump

units.

1) In the case of qualification by tests on complete pump units the following procedure shall be

applied:

To qualify a pump unit type for conformity to requirements by law with respect to the EEI-value,

tests and evaluations shall be carried out by taking pump units randomly out of the pump unit

population. From the result of measurements and evaluations, the mean value EEI shall be

mean

determined (for example as described in Annex B). The pump unit type is then qualified for

conformity to law if the mean EEI-value determined as described above fulfils the condition

EEI < EEI < EEI (3)

mean declared allowable

where the value EEI is prescribed by law. EEI is without any tolerance for the

allowable mean

qualification procedure. In the verification procedure, according to Clause 6, a tolerance t = 7 %

EEI

is applied to the value of EEI which results from verification tests. This tolerance is not part of

test

the method to qualify a pump unit type by the supplier and shall not be applied on the result of the

qualification procedure.

2) In the case of qualification by applying the semi-analytical models as described in other parts of

Standard, the EEI-value resulting from the calculations (considering uncertainties of input values

and model errors), taken as the mean value EEI :

mean

— is used to qualify the pump unit type for conformity to law per Formula (3);

— and can be indicated as numerical value with two digits after the decimal point on the

nameplates and/or in the technical documentation.

11

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

6 Verification of the Energy Efficiency Index for pump units

6.1 General remarks

The Indicated Energy Efficiency Index can be checked and confirmed by an independent institution, e.g.

in the frame of market surveillance. This is called verification procedure in this document.

A verification procedure either needs checking the technical documentation and (re-)calculation

according to the methodology called semi analytical models, if specified in the respective parts of this

standard, or the verification procedure can be done by measuring the test pump units. These tests need

only a very limited number of test pump units and tests, but nevertheless enable with sufficient

certainty the confirmation (or rejection) of the conformity with respect to EEI or validity of the

allowable

indicated value of EEI. The procedure is based on simple pass-or-fail tests. Some explanations regarding

the probability of the results of a verification procedure are given in Annex E.

6.2 Procedure and decision

In the case of a verification procedure based on measurement the verification procedure consists of

several steps:

1) An individual pump unit is drawn at random out of the pump unit population, tested and evaluated

according to other parts of this standard and assessed with respect to the corresponding Energy

Efficiency Index (EEI) as described below.

2) If the individual pump unit has passed according to the criterion described below, the conformity

and/or the validity of the indicated numerical EEI-value of the investigated pump unit type is

confirmed.

3) If the first individual pump unit does not fulfil the criterion described below, three other individual

pump units are drawn at random, tested and evaluated according to other parts of this standard.

4) The values of EEI determined for each of the three additionally tested pump units are arithmetically

averaged by the means of Formula (4)

3

1

()EEI ⋅ ()EEI (4)

∑

avg,3 i

3

i=1

where (EEI) is the EEI-value determined individually for each of the three additional test pump

i

units.

5) The (EEI) of pump units is assessed with respect to the criterion described below.

avg,3

6) If the (EEI) of pump units also fails according to the criterion described below, the qualification

avg,3

of the investigated pump unit type with respect to the Energy Efficiency Index (EEI) is rejected.

7) If the (EEI) of pump units passes according to the criterion described below, the pump unit

avg,3

type passes although the first pump unit has failed.

The tests and evaluations on each of the pump units drawn at random and independently from each

other out of the pump unit type population for which the Energy Efficiency Index (EEI) shall be verified

shall be carried out according to other parts of this standard.

12

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

For the decision on passing or failing the verification in respect to EEI, a total tolerance of

t = 7 %

EEI

is applied to the nominal value of EEI. The nominal value for a pump unit type is:

— the maximum allowable value EEI required by law for assessing the conformity to law,

allowable

— the numerical EEI-value indicated on the nameplates and/or in the technical documentation of the

pump unit type for assessing the indicated value.

This tolerance considers the effects of manufacturing performance tolerances within a pump unit type

population (see Annex B) and the measurement uncertainties (see Annex D) of the verification test(s).

By application of the total tolerance on the nominal value, i.e. by multiplying it with the factor

1+ t

= 1.07,

EEI

the particular threshold value results serves for assessment.

Decision criterion:

The first tested pump unit or the (EEI) of the pump units passes with respect to assessing the

avg,3

Energy Efficiency Index (EEI) if the EEI-value resulting from the test(s) and evaluations is not

avg,3

higher than the corresponding particular threshold value.

The first tested pump or the (EEI) of the pump units fails with respect to assessing the Energy

avg,3

Efficiency Index (EEI) if the EEI-value resulting from the test(s) and evaluations is higher than the

corresponding particular threshold value.

13

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

Annex A

(informative)

Mean value and confidence interval of the Energy Efficiency Index EEI

In respect to the energy efficiency, the whole pump unit type is characterized by the mean value

EEI of its population.

mean

Within one pump unit type, there is an inevitable scatter of performance data and characteristics of the

components (pump, motor, frequency converter (if available) and auxiliaries (if available)). This applies

also to the hydraulic and electrical pe

**...**

SLOVENSKI STANDARD

SIST EN 17038-1:2019

01-julij-2019

Črpalke - Metode za kvalifikacijo in verifikacijo indeksa energijske učinkovitosti

centrifugalnih črpalk - 1. del: Splošne zahteve in postopki za preskušanje in

izračun indeksa energijske učinkovitosti (EEI)

Pumps - Methods of qualification and verification of the Energy Efficiency Index for

rotodynamic pumps units - Part 1: General requirements and procedures for testing and

calculation of energy efficiency index (EEI)

Pumpen - Methoden zur Qualifikation und Verifikation des Energieeffizienzindexes für

Kreiselpumpen - Teil 1: Allgemeine Anforderungen und Vorgehensweisen zur Prüfung

und Berechnung des Energieeffizienzindexes (EEI)

Pompes - Méthodes de qualification et de vérification de l'indice de rendement

énergétique des groupes motopompes rotodynamiques - Partie 1 : Exigences générales

et procédures d'essai et de calcul de l'indice de rendement énergétique (EEI)

Ta slovenski standard je istoveten z: EN 17038-1:2019

ICS:

23.080 Črpalke Pumps

SIST EN 17038-1:2019 en,fr,de

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

---------------------- Page: 1 ----------------------

SIST EN 17038-1:2019

---------------------- Page: 2 ----------------------

SIST EN 17038-1:2019

EN 17038-1

EUROPEAN STANDARD

NORME EUROPÉENNE

May 2019

EUROPÄISCHE NORM

ICS 23.080

English Version

Pumps - Methods of qualification and verification of the

Energy Efficiency Index for rotodynamic pump units - Part

1: General requirements and procedures for testing and

calculation of Energy Efficiency Index (EEI)

Pompes - Méthodes de qualification et de vérification Pumpen - Methoden zur Qualifikation und Verifikation

de l'indice de rendement énergétique des groupes des Energieeffizienzindexes für Kreiselpumpen - Teil 1:

motopompes rotodynamiques - Partie 1 : Exigences Allgemeine Anforderungen und Vorgehensweisen zur

générales et procédures d'essai et de calcul de l'indice Prüfung und Berechnung des Energieeffizienzindexes

de rendement énergétique (EEI) (EEI)

This European Standard was approved by CEN on 15 July 2018.

CEN 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 CEN

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 CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION

COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17038-1:2019 E

worldwide for CEN national Members.

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

Contents Page

European foreword . 3

Introduction . 4

1 Scope . 5

2 Normative references . 5

3 Terms and definitions, symbols and subscripts . 5

4 Energy Efficiency Index (EEI) calculations . 9

4.1 General information and explanation on EEI . 9

4.2 Weighted-average value of the electric power input . 9

4.3 The reference electric power input P . 10

1, ref

5 Qualification of pump unit types in respect to their Energy Efficiency Index . 10

5.1 General remarks . 10

5.2 Qualification methods . 11

6 Verification of the Energy Efficiency Index for pump units . 12

6.1 General remarks . 12

6.2 Procedure and decision . 12

Annex A (informative) Mean value and confidence interval of the Energy Efficiency Index EEI . 14

Annex B (informative) Methods recommended for the qualification of a pump unit type by

test . 19

B.1 General remarks . 19

B.2 Determination of the mean value of EEI of a pump unit type population from a test

on only one test pump unit . 19

B.3 Determination of the mean value of EEI of a pump unit type population from a

sample test of M pump units . 20

Annex C (informative) Application of mathematical statistics on tests . 23

C.1 Purposes of applying statistics in the frame of qualification and verification . 23

C.2 Normal or Gaussian distribution . 23

C.3 Confidence interval . 24

C.4 Outlier test . 25

Annex D (informative) Measurement uncertainties . 27

Annex E (informative) The probability of the result of the verification procedure . 30

E.1 General . 30

E.2 Probability that the conformity to law is confirmed by verification tests . 32

E.3 Probability that a numerical value of indicated by the responsible company is

confirmed by verification tests . 33

Bibliography . 34

2

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

European foreword

This document (EN 17038-1:2019) has been prepared by Technical Committee CEN/TC 197 “Pumps”,

the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by November 2019, and conflicting national standards

shall be withdrawn at the latest by November 2019.

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

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

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.

3

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

Introduction

This document is the first part of a series of standards describing a methodology to evaluate energy

efficiency performance of pump units, comprising the pump, the motor with or without frequency

converter, based on a non-dimensional numerical value called Energy Efficiency Index (EEI). An EEI

allows the comparison of different pump sizes and types with one common indicator. Physical

influences such as pump size, specific speed, pump unit part-load operation, motor-efficiency

characteristic and frequency converter influence are implemented into this indicator.

This standard series covers pump units which component wise can be placed on the market and

assembled into a pump unit or are placed on the market as one single product. To cover these two cases

a semi-analytical model has been developed in order to derive the EEI based on nominal data of the

components only. This case happens for example when an assembler of the components builds the

pump unit on site and consequently a product test cannot be done by for this assembler or when a

manufacturer is quoting a pump-unit which uses a combination of components not previously built.

This particular standard gives an overview of the basic concept of EEI (Clause 4), basic concepts of flow-

time profiles and reference pressure control curves, the qualification (Clause 5) of a pump unit type

regarding an EEI and the verification of EEI values (Clause 6) given for a pump unit type either by

measurement or calculation.

Specific requirements for testing, a calculation method for an EEI, the so called semi-analytical model of

a complete pump unit, specific flow-time profiles and reference control curves are given in the

subsequent parts of this standard series.

4

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

1 Scope

This document describes a methodology to evaluate energy efficiency performance of pump units based

on a non-dimensional numerical value called Energy Efficiency Index (EEI).

This document covers pump units consisting of:

— one single or several rotodynamic water pump(s), including where integrated in other products,

and driven by a motor system, consisting of an electrical motor, and either:

— a terminal box which only enables to operate the pump unit at constant motor stator frequency

and thereby (nearly) constant rotational speed, or

— a CDM (Complete Drive Module) which enables to operate the pump unit at variable rotational

speed depending on a varying demand of flow rate and/or discharge or differential pressure.

NOTE A CDM is also often called VSD (Variable Speed Drive).

Pump units as defined above are treated as extended products in respect to their energy efficiency.

2 Normative references

There are no normative references in this document.

3 Terms and definitions, symbols and subscripts

For the purpose 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

fixed speed

constant motor stator frequency

3.2

variable speed

varying motor stator frequency

3.3

Energy Efficiency Index

EEI

ratio between P and P

1, avg 1, ref

3.4

reference electrical power input P

1, ref

calculated power input of the pump unit at the best efficiency point

3.5

average electrical power input P

1, avg

power input weighted by the load profile

5

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

3.6

pump unit

pump driven by a motor system

3.7

motor system

combination of an electric motor and either a terminal box or a CDM

3.8

pump unit type

identical pump units of the same configuration

3.9

pressure control curve

functional dependency of the demanded head H vs. the delivered flow rate Q in the form of a non-

dimensional correlation H/H = f (Q/Q )

100% 100%

3.10

reference pressure control curve

pre-defined functional dependency H/H = f (Q/Q ) for standardized measurements and

100% 100%

calculations of average power input P

1, avg

3.11

Complete Drive Module

CDM

electronic power converter connected between the electric supply and a motor as well as extensions

such as protection devices, transformers and auxiliaries

[SOURCE: EN 61800-2]

3.12

Power Drive System

PDS

combination of CDM and motor

6

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

Table 1 — List of basic letters and subscripts

Symbol Quantity Unit

C Constant dimensionless number

D Diameter m

e Measurement uncertainty, relative value dimensionless number

E Overall measurement uncertainty dimensionless number

−1

f Frequency

s , Hz

2

g Acceleration due to gravity

m/s

H Pump total head m

k Number of sample pumps dimensionless number

m Mass kg

M Number of pumps in a sample dimensionless number

−1 −1

n Speed of rotation

s , min

N Number of instrument readings dimensionless number

n Specific speed min−1

s

p Pressure Pa

p Probability density dimensionless number

P Power W

3

Q (Volume) rate of flow

m /s

s Standard deviation of a sample according to special quantity

t Tolerance factor, relative value dimensionless number

t Time s

t Student’s factor dimensionless number

T Torque Nm

u Peripheral velocity m/s

U Mean velocity m/s

U Voltage V

v Local velocity m/s

3

V Volume

m

x General quantity according to specified usage

y General quantity according to specified usage

z Height above reference plane m

z number of produced pumps dimensionless number

η Efficiency dimensionless number

θ Temperature °C

2

ν Kinematic viscosity

m /s

3

ρ Density

kg/m

ω Angular velocity rad/s

σ Standard deviation of normal distribution according to special quantity

7

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

Table 2 — List of letters and figures used as subscripts

Subscript Meaning

1 electrical

2 mechanical

abs absolute

allowable permitted e.g. by regulations

declared indicated by the manufacturer

verification permitted in verification process

individual specific to one pump unit

amb ambient

annual per year

BEP best efficiency point

dr drive

D datum

exp experimentally determined

G guaranteed

H pump total head

I numbering index

J numbering index

imp impeller

man manufacturing

max maximum permissible

mean arithmetic mean value

meas measured value

min, requ minimum required

N nominal

OL overload

Pd pre-defined

P power

PL part load

Q (volume) flow rate

R random

S specific, systematic

sync synchronous

tot total, overall

true true value

T torque

v vapour

x of quantity x

y % for probability of y %

8

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

4 Energy Efficiency Index (EEI) calculations

4.1 General information and explanation on EEI

The ratio of P and P is a quantitative indicator for the energy efficiency of pump units. It is

1, avg 1, ref

called Energy Efficiency Index (EEI) and is defined by Formula (1):

P

1, avg

(1)

EEI=

P

1,ref

is compared

In order to assess the efficiency of pump units, their actual electrical power input P

1, avg

with a reference value called P . It is a nominal power input of a fictitious pump unit running at

1, ref

nominal 100 % point.

The value of P for the different pump types are defined in other parts of this standard.

1, ref

The declared EEI value is based on the actual pump curves whether these are realized with full

diameter impeller, a trimmed impeller or a power limited curve.

NOTE Contrary to the efficiency values η of the unit components, the lower the numerical value of EEI, the

better the energy efficiency of pump units.

4.2 Weighted-average value of the electric power input

The quantification of energy efficiency of pump units should be based on the weighted average of

electrical power input P .

1, avg

The weighting factor when averaging the electrical power input P is the fraction of operating time at

1

the respective flow rate. Generally, for any application there is a continuous function describing the

dependency of (differential) time fraction dt/t on the relative flow rate Q/Q where t is the

tot 100 % tot

total operating time and Q is defined in the specific parts of this standard.

100 %

For the assessment of the energy efficiency of pump units, common and standardized “flow-time

profiles” are needed as basis for indicating their energy efficiency. The flow-time profile is defined for

each pump type in other parts of this standard.

In order to simplify further the determination of a value which characterizes the energy efficiency of

pump units, in this document the different flow-time profiles are described by a limited number of

points, not by a continuous curve or function. These discrete points are pairs of values of Q/Q and

100 %

Δt/t . These values define the discretised flow-time profiles. They are given as reference flow-time

tot

profiles in the specific parts of this standard. (In this case, Δt is a finite fraction of operating time and

Q/Q is the average value of relative flow rate demanded within this time fraction.)

100 %

NOTE 1 The reference flow-time profiles defined in this document for variable flow operation reflect the

typical ranges and variations of demanded flow rate in these types of applications and are based on experimental

field studies, see [1], [2].

9

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

For a given reference flow-time profile, the weighted average of the electric power input P is

1, avg

calculated by Formula (2):

N

∆t

P = ⋅ P (2)

1,avg

∑ 1, i

t

tot

i=1i

where

i is the consecutive number of the points of the flow-time profile and N is the total number of the

points of the flow-time profile.

For calculating P , the electric power input P shall be known for each value Q/Q of the

1, avg 1 100 %

reference flow-time profile.

But as for the flow-time profiles, common and standardized correlations H/H = f (Q/Q ) are

100 % 100 %

needed as basis for indicating and comparing the energy efficiency of pump units placed on the market

and/or put into service as extended products. These standardized correlations H/H = f (Q/Q )

100 % 100 %

are called reference pressure control curves in this document and are defined in subsequent parts of

this standard.

For calculating P in the case of variable speed operation, the electric power input P shall be

1, avg 1

determined at the relative flow rate values Q/Q of the relevant reference load-flow profile and for

100 %

the corresponding rotational speed n.

NOTE 2 Especially at low values of Q/Q the electric power input P is considerably higher for pump units

100 % 1

operated at constant motor stator frequency than for speed controlled pump units. This holds true independently

of the actual pressure control curve.

4.3 The reference electric power input P

1, ref

For assessing the energy efficiency of pump units within the scope of this document, a non-dimensional

value is needed which directly reflects the energy efficiency of pump units. The numerical magnitude of

this value shall be independent of parameters which influence the unit component's efficiency such as,

for example, their geometrical size and nominal power. For this purpose, the actual electrical power

input P averaged according to Formula (1) is divided by an appropriate reference value P . This

1, avg 1, ref

reference value shall:

— have a physical basis;

— consider relevant influences on the electrical power input of pump units;

— be independent from the efficiency related quality of individual components of the pump unit.

The chosen definitions of P which fulfil these requirements are given in other parts of this standard.

1, ref

5 Qualification of pump unit types in respect to their Energy Efficiency Index

5.1 General remarks

The qualification of a pump unit type in respect to the Energy Efficiency Index (EEI) is the responsibility

of the company which places it on the market and/or puts it into service.

Product information on EEI of a pump unit type can either state the (legally) required EEI in the format

“EEI ≤ 0.XX” or can indicate a lower value “EEI ≤ 0.YY” if the pump unit type is qualified for that and the

manufacturer decides so. EEI values shall be rounded to two decimal places.

10

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

5.2 Qualification methods

Generally, the method which is applied to determine the EEI-value in the frame of the qualification

procedure is left to the company which is responsible.

In this document, two methods of qualification are described. Both methods result in a high probability

of a successful verification:

1) Tests on complete pump units and evaluation of the test results to determine the EEI-value.

2) Determination of the EEI-value by applying a semi-analytical model of the complete pump unit.

These methods are described in detail in specific parts of this standard for the respective types of pump

units.

1) In the case of qualification by tests on complete pump units the following procedure shall be

applied:

To qualify a pump unit type for conformity to requirements by law with respect to the EEI-value,

tests and evaluations shall be carried out by taking pump units randomly out of the pump unit

population. From the result of measurements and evaluations, the mean value EEI shall be

mean

determined (for example as described in Annex B). The pump unit type is then qualified for

conformity to law if the mean EEI-value determined as described above fulfils the condition

EEI < EEI < EEI (3)

mean declared allowable

where the value EEI is prescribed by law. EEI is without any tolerance for the

allowable mean

qualification procedure. In the verification procedure, according to Clause 6, a tolerance t = 7 %

EEI

is applied to the value of EEI which results from verification tests. This tolerance is not part of

test

the method to qualify a pump unit type by the supplier and shall not be applied on the result of the

qualification procedure.

2) In the case of qualification by applying the semi-analytical models as described in other parts of

Standard, the EEI-value resulting from the calculations (considering uncertainties of input values

and model errors), taken as the mean value EEI :

mean

— is used to qualify the pump unit type for conformity to law per Formula (3);

— and can be indicated as numerical value with two digits after the decimal point on the

nameplates and/or in the technical documentation.

11

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

6 Verification of the Energy Efficiency Index for pump units

6.1 General remarks

The Indicated Energy Efficiency Index can be checked and confirmed by an independent institution, e.g.

in the frame of market surveillance. This is called verification procedure in this document.

A verification procedure either needs checking the technical documentation and (re-)calculation

according to the methodology called semi analytical models, if specified in the respective parts of this

standard, or the verification procedure can be done by measuring the test pump units. These tests need

only a very limited number of test pump units and tests, but nevertheless enable with sufficient

certainty the confirmation (or rejection) of the conformity with respect to EEI or validity of the

allowable

indicated value of EEI. The procedure is based on simple pass-or-fail tests. Some explanations regarding

the probability of the results of a verification procedure are given in Annex E.

6.2 Procedure and decision

In the case of a verification procedure based on measurement the verification procedure consists of

several steps:

1) An individual pump unit is drawn at random out of the pump unit population, tested and evaluated

according to other parts of this standard and assessed with respect to the corresponding Energy

Efficiency Index (EEI) as described below.

2) If the individual pump unit has passed according to the criterion described below, the conformity

and/or the validity of the indicated numerical EEI-value of the investigated pump unit type is

confirmed.

3) If the first individual pump unit does not fulfil the criterion described below, three other individual

pump units are drawn at random, tested and evaluated according to other parts of this standard.

4) The values of EEI determined for each of the three additionally tested pump units are arithmetically

averaged by the means of Formula (4)

3

1

()EEI ⋅ ()EEI (4)

∑

avg,3 i

3

i=1

where (EEI) is the EEI-value determined individually for each of the three additional test pump

i

units.

5) The (EEI) of pump units is assessed with respect to the criterion described below.

avg,3

6) If the (EEI) of pump units also fails according to the criterion described below, the qualification

avg,3

of the investigated pump unit type with respect to the Energy Efficiency Index (EEI) is rejected.

7) If the (EEI) of pump units passes according to the criterion described below, the pump unit

avg,3

type passes although the first pump unit has failed.

The tests and evaluations on each of the pump units drawn at random and independently from each

other out of the pump unit type population for which the Energy Efficiency Index (EEI) shall be verified

shall be carried out according to other parts of this standard.

12

=

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

For the decision on passing or failing the verification in respect to EEI, a total tolerance of

t = 7 %

EEI

is applied to the nominal value of EEI. The nominal value for a pump unit type is:

— the maximum allowable value EEI required by law for assessing the conformity to law,

allowable

— the numerical EEI-value indicated on the nameplates and/or in the technical documentation of the

pump unit type for assessing the indicated value.

This tolerance considers the effects of manufacturing performance tolerances within a pump unit type

population (see Annex B) and the measurement uncertainties (see Annex D) of the verification test(s).

By application of the total tolerance on the nominal value, i.e. by multiplying it with the factor

1+ t

= 1.07,

EEI

the particular threshold value results serves for assessment.

Decision criterion:

The first tested pump unit or the (EEI) of the pump units passes with respect to assessing the

avg,3

Energy Efficiency Index (EEI) if the EEI-value resulting from the test(s) and evaluations is not

avg,3

higher than the corresponding particular threshold value.

The first tested pump or the (EEI) of the pump units fails with respect to assessing the Energy

avg,3

Efficiency Index (EEI) if the EEI-value resulting from the test(s) and evaluations is higher than the

corresponding particular threshold value.

13

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SIST EN 17038-1:2019

EN 17038-1:2019 (E)

Annex A

(informative)

Mean value and confidence interval of the Energy Efficiency Index EEI

In respect to the energy efficiency, the whole pump unit type is characterized by the mean value

EEI of its population.

mean

Within one pump unit type, there is an inevitable scatter of performance data and characteristics of the

components (pump, motor, frequency converter (if available) and auxiliaries (if available)). This applies

also to the hydraulic and electrical performance quantities which relevant for the Energy Efficiency

Index (EEI). This sca

**...**

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