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.
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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.
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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 performance quantities which relevant for the Energy Efficiency
Index (EEI). This sca
...
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