kSIST FprEN 17038-3:2019

Pumps - Rotodynamic Pumps - Energy efficiency Index - Methods of qualification and verification - Part 3: Testing and calculation of ener-gy efficiency index (EEI) of booster sets

The proposed Part 3 of the Standard on energy efficiency index (EEI) of pump units focusses on booster sets.
Part 3 will give special definitions  (e.g. a reference flow-time profile, a reference pressure control and - in the case of multipump booster sets - a reference switching control and a reference electric power input) that have to be applied when determining their energy efficiency index (EEI).
It will describe two methods and procedures how to determine the energy efficiency index (EEI) of booster sets in the frame of qualification or verification.

Pumpen - Kreiselpumpen - Methoden zur Qualifikation und Verifikation - Teil 3: Prüfung und Berechnung des Energieeffizienzindexes (EEI) von Druckerhöhungsanlagen

Pompes - Pompes rotodynamiques - Indice de rendement énergétique - Méthodes de qualification et de vérification - Partie 3 : Essai et calcul de l’indice de rendement énergétique (EEI) des groupes de surpression

Le présent document spécifie les méthodes et procédures d’essai, de calcul et de détermination de l’indice de rendement énergétique (EEI) des groupes de surpression.
Un groupe de surpression se présente sous la forme soit d’un groupe motopompe individuel, soit d’un assemblage de groupes motopompes raccordés en parallèle avec une puissance hydraulique maximale de 150 kW et un débit nominal d’au moins 6 m³/h (0,001 667 m³/s), destiné à être utilisé avec un disconnecteur hydraulique et des composants supplémentaires influençant les performances hydrauliques, ainsi qu’avec les composants nécessaires pour contrôler la pression ou assurer un écoulement dans les boucles ouvertes à l’intérieur de bâtiments, et qui est commercialisé et/ou mis en service en tant que produit individuel conçu pour le pompage d’eau propre et sans fonctionnalité d’auto-amorçage.

Črpalke - Rotodinamične črpalke - Indeks energijske učinkovitosti - Metode za kvalifikacijo in verifikacijo - 3. del: Preskušanje in izračun indeksa energijske učinkovitosti (EEI) ojačevalnikov

General Information

• Status: Not Published
• Public Enquiry End Date: 07-Mar-2018
• ICS: 23.080 - Pumps
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 98 - Abandoned project (Adopted Project)
• Start Date: 22-May-2024
• Due Date: 27-May-2024
• Completion Date: 22-May-2024
• Ref Project: FprEN 17038-3 - Pumps - Rotodynamic Pumps - Energy efficiency Index - Methods of qualification and verification - Part 3: Testing and calculation of energy efficiency index (EEI) of booster sets

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 17038-3:2018
01-marec-2018
ýUSDONH5RWRGLQDPLþQHþUSDONH,QGHNVHQHUJLMVNHXþLQNRYLWRVWL0HWRGH]D
NYDOLILNDFLMRLQYHULILNDFLMRGHO3UHVNXãDQMHLQL]UDþXQLQGHNVDHQHUJLMVNH
XþLQNRYLWRVWL((,RMDþHYDOQLNRY
Pumps - Rotodynamic Pumps - Energy efficiency Index - Methods of qualification and
verification - Part 3: Testing and calculation of ener-gy efficiency index (EEI) of booster
sets
Pumpen - Kreiselpumpen - Methoden zur Qualifikation und Verifikation - Teil 3: Prüfung
und Berechnung des Energieeffizienzindexes (EEI) von Druckerhöhungsanlagen
Pompes - Pompes rotodynamiques - Indice de rendement énergétique - Méthodes de
qualification et de vérification - Partie 3 : Essai et calcul de l’indice de rendement
énergétique (EEI) des groupes de surpression
Ta slovenski standard je istoveten z: prEN 17038-3
ICS:
23.080 ýUSDONH Pumps
oSIST prEN 17038-3:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 17038-3:2018
oSIST prEN 17038-3:2018
DRAFT
EUROPEAN STANDARD
prEN 17038-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2017
ICS 23.080
English Version
Pumps - Rotodynamic Pumps - Energy efficiency Index -
Methods of qualification and verification - Part 3: Testing
and calculation of ener-gy efficiency index (EEI) of booster
sets
Pompes - Pompes rotodynamiques - Indice de Pumpen - Kreiselpumpen - Methoden zur Qualifikation
rendement énergétique - Méthodes de qualification et und Verifikation - Teil 3: Prüfung und Berechnung des
de vérification - Partie 3 : Essai et calcul de l'indice de Energieeffizienzindexes (EEI) von
rendement énergétique (EEI) des groupes de Druckerhöhungsanlagen
surpression
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 197.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17038-3:2017 E
worldwide for CEN national Members.

oSIST prEN 17038-3:2018
prEN 17038-3:2017 (E)
Contents
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and units . 7
3.1 Terms and definitions . 7
3.2 Symbols and units . 9
4 General conditions for the determination of EEI . 11
4.1 Hydraulic loop . 11
4.2 Booster set . 11
5 Reference flow-time profile and reference pressure control curve . 12
5.1 Reference flow-time profile . 12
5.2 Reference pressure control curve . 12
6 Rules to be applied for not accessible load points . 12
7 Penalties for deviations of the pressure control . 12
8 Determination of average electric power input P by test . 14
1,avg
8.1 General . 14
8.2 Measurement procedure . 16
8.3 Calculation of P . 20
1,avg
9 Determination of average electric power input P by the means of a Semi-
1,avg
Analytical Model (SAM) . 20
9.1 General . 20
9.2 Pre-defined mode of operation and version of pressure and switching control . 21
9.3 The semi-analytical model of pumps . 23
9.4 The semi-analytical model of electric motors and/or of power drive systems (PDSs) . 23
9.5 Modelling internal piping and valve losses . 23
9.6 Auxiliary electrical losses . 24
9.7 Calculation of Q and H . 24
100 % 100 %
9.8 Calculation of P in dependence of Q/Q . 25
1 100 %
9.9 Calculation of P . 31
1,avg
10 Determination of reference electric power input P . 31
1,ref
11 Calculation of Energy Efficiency Index (EEI) . 33
Annex A (informative) Configurations and modes of operation and control . 34
A.1 Configurations and modes of operation . 34
A.2 Control versions . 35
Annex B (normative) On-site verification tests . 37
Annex C (informative) Effect of operation mode and type of pressure control on EEI . 38
oSIST prEN 17038-3:2018
prEN 17038-3:2017 (E)
Annex D (informative) Effect of control deviations on EEI . 40
Annex E (informative) Uncertainties and tolerances of EEI . 42
E.1 General . 42
E.2 The measurement uncertainty of EEI-values determined by test . 42
E.3 The model uncertainty of EEI-values determined by the means of the SAM . 45
E.4 The manufacturing tolerance of the EEI-value of booster sets . 46
E.5 The total tolerance of EEI-values determined by tests . 47
E.6 The total tolerance of EEI-values determined by the means of the SAM . 48

oSIST prEN 17038-3:2018
prEN 17038-3:2017 (E)
European foreword
This document (prEN 17038-3:2017) has been prepared by Technical Committee CEN/TC 197 “Pumps”,
the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
oSIST prEN 17038-3:2018
prEN 17038-3:2017 (E)
Introduction
This part of the European Standard is the third part of a series of standards describing a methodology to
evaluate energy efficiency performance of booster sets, comprising one or more pump(s), the motor(s)
with or without frequency converter, and additional components influencing hydraulic performance. It
is based on a non-dimensional numerical value called Energy Efficiency Index (EEI). An EEI allows the
comparison of different configurations with one common indicator. Physical influences such as number
and size of the incorporated pump(s), pump unit part-load operation, motor-efficiency characteristic
and frequency converter influence are implemented into this metric.
Specific requirements for testing and a calculation method for EEI, the so called semi-analytical model
(SAM) of a complete booster set, a specific flow-time profile and a reference control curve are given in
this part of the standard.
EEI is an index to rate booster sets according to their energy efficiency but does not replace the need to
do a life-time cost analysis regarding energy consumption over the life time of the booster set.
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prEN 17038-3:2017 (E)
1 Scope
This documents specifies methods and procedures for testing, calculating and determining the Energy
Efficiency Index (EEI) of booster sets.
A booster set is either a single pump unit or an assembly of pump units connected in parallel with a
3 3
maximum hydraulic power of 150 kW, a minimum rated flow of 6 m /h (0,001667 m /s), to be operat-
ed with backflow prevention and additional components influencing hydraulic performance and with
components necessary to control pressure or provide flow in open loops inside buildings and which is
placed on the market and/or put into service as one single product and its intended use is to pump
clean water and does not have a self-priming functionality.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content con-
stitutes requirements of this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN ISO 17769-1, Liquid pumps and installation - General terms, definitions, quantities, letter symbols and
units - Part 1: Liquid pumps (ISO 17769-1)
EN ISO 9906, Rotodynamic pumps - Hydraulic performance acceptance tests - Grades 1, 2 and 3 (ISO
9906)
EN 16480, Pumps - Minimum required efficiency of rotodynamic water pumps
EN 60034-1, Rotating electrical machines - Part 1: Rating and performance
EN 60034-30-1, Rotating electrical machines - Part 30-1: Efficiency classes of line operated AC motors (IE
code)
CLC/FprTS 60034-30-2, Rotating electrical machines - Part 30-2: Efficiency classes of variable speed AC
motors (IE-code)
EN 60034-2-1, Rotating electrical machines - Part 2-1: Standard methods for determining losses and effi-
ciency from tests (excluding machines for traction vehicles)
EN 60034-2-2, Rotating electrical machines - Part 2-2: Specific methods for determining separate losses of
large machines from tests - Supplement to IEC 60034-2-1
IEC/TS 60034-2-3, Rotating electrical machines - Part 2-3: Specific test methods for determining losses
and efficiency of converter-fed AC induction motors
EN 60038:2011, CENELEC standard voltages
EN 61800-2, Adjustable speed electrical power drive systems - Part 2: General requirements - Rating speci-
fications for low voltage adjustable speed a.c. power drive systems (IEC 61800-2)
EN 61800-9-1, Adjustable speed electrical power drive systems - Part 9-1: Ecodesign for power drive sys-
tems, motor starters, power electronics and their driven applications - General requirements for setting
energy efficiency standards for power driven equipment using the extended product approach (EPA) and
semi analytic model (SAM)
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prEN 17038-3:2017 (E)
3 Terms, definitions, symbols and units
3.1 Terms and definitions
For the purpose of this document, the terms and definitions given in EN ISO 17769-1 and the following
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
3.1.1
booster set
either a single pump unit or an assembly of pump units connected in parallel with a maximum hydraulic
3 3
power of 150 kW, a minimum rated flow of 6 m /h (0,001667 m /s), to be operated with backflow pre-
vention and additional components influencing hydraulic performance and with components necessary
to control pressure or provide flow in open loops inside buildings and which is placed on the market
and/or put into service as one single product and its intended use is to pump clean water and does not
have a self-priming functionality
3.1.2
expansion tank
tank partially filled with air, whose compressibility cushions pressure deviations under balancing small
water volumes between the tank and the connected system
3.1.3
fixed-speed pump
pump without an electronic power converter
3.1.4
variable-speed pump
pump equipped with an electronic power converter
3.1.5
jockey pump
pump sized for considerably less flow than other pumps of the booster set and is intended only to han-
dle leakage flows and/or small flows during cut-in of another pump
3.1.6
stand-by pump
pump only used for booster set operation when another pump fails
3.1.7
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 (according to EN 61800-2)
3.1.8
Power Drive System (PDS)
combination of a CDM and an electric motor
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prEN 17038-3:2017 (E)
3.1.9
suction pressure
pressure at the inlet of a booster set
Note 1 to entry: All pressures are gauge pressures (relative to the ambient pressure).
3.1.10
discharge pressure
pressure at the outlet of a booster set
3.1.11
total differential head
the total differential head (or only head) of the booster set is
pp−
ds
H=
ρ⋅ g
(1)
where
H is the total differential head [m]
is the delivery pressure [bar (g)]
pd
p is the suction pressure [bar (g)]
s
ρ is the density of the test water at 20° C temperature 998,2 kg/m
g is the gravitational constant of 9,81 m/s
Note 1 to entry: The differences of dynamic head v /(2∙g) and geodetic height z between inlet and outlet of the
booster set are typically zero or very small compared to the pressure head and are, therefore, neglected in Formu-
la (1).
3.1.12
hydraulic power
arithmetic product of the flow Q and the head H and a constant
P 2,72⋅⋅Q H
hyd
(2)
where
P is the hydraulic power [W]
hyd
Q is the flow [m /h]
H is the total head [m]
3.1.13
maximum hydraulic power
maximum value of the hydraulic power values of a booster set
Note 1 to entry: The booster set shall be capable and designed to run in maximum hydraulic power continuous-
ly
=
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prEN 17038-3:2017 (E)
3.1.14
booster set maximum hydraulic power point
booster set operation point leading to maximum hydraulic power
3.1.15
100%-flow rate
flow rate at booster set maximum hydraulic power point
3.1.16
100%-head
total differential head at booster set maximum hydraulic power point
3.1.17
control curve
adjusted delivery pressure dependent on flow rate of a booster set with at least one variable-speed
pump
3.1.18
reference control curve
one representative pressure control curve defined relatively to the booster set maximum hydraulic
power point
3.1.19
flow-time profile
relation between flow rate intervals and relative operation time
3.1.20
reference flow rate
flow rate defined by the 100%-flow rate and the flow-time profile
3.1.21
reference head
total differential head defined by the reference control curve and the reference flow rate
3.2 Symbols and units
For this document the symbols and units given in Table 1 are valid
Table 1 – Symbols and units
Symbol Designation Unit
A Cross section m
e Uncertainty %
g Gravitational constant m/s
H (Total differential) head m
H Internal head loss m
L
H Head loss of closed hydraulic loop m
loop
H Measured head m
meas
H Reference head m
ref
oSIST prEN 17038-3:2018
prEN 17038-3:2017 (E)
Head loss of the connected hydraulic sys-
H m
resistance
tem
H 100 %-head m
100 %
i Consecutive number of load points -
j Total number of actually running pumps -
k Number of running fixed speed pumps -
K Constant in Formula (3) m/(m /h)
Consecutive number of a time-sample in
m -
test
−1
n Nominal rotational speed of a pump min
N,PU
−1
n Specific speed of a pump min
s
N Total number of load points -
Q Flow rate m /h
Flow rate at best efficiency point of a
Q m /h
BEP,PU
pump
Q Flow rate of fixed speed pump m /h
fix
Q Next higher adjustable flow rate m /h
higher
Q Next lower adjustable flow rate m /h
lower
Q Next lower adjustable flow rate m /h
lower
Flow rate at switching off one running
Q m /h
off
pump
Qon Flow rate at switching on one more pump m /h
Q Reference flow rate m /h
ref
Q Flow rate from test m /h
test
Q Flow rate after switching on or off a pump m /h
tr
Q Flow rate of variable speed pump m /h
var
Q 100 %-flow rate m /h
100 %
ΔQ Switching hysteresis of flow rate m /h
p Pressure bar (g)
p Suction pressure bar (g)
s
p Discharge pressure bar (g)
d
p 100 %-discharge pressure bar (g)
d,100 %
p Reference pressure bar (g)
ref
P Electric power W, kW
P Measured electric power W, kW
1,meas
P Penalty electric power W, kW
1,pen
oSIST prEN 17038-3:2018
prEN 17038-3:2017 (E)
P Shaft power W, kW
P Power loss W, kW
L
t Manufacturing tolerance %
tj Time fraction -
Vtank Volume of an expansion tank l
Number of pumps incorporated in a
z -
booster set
ρ Density kg/m
ζ Loss coefficient -
4 General conditions for the determination of EEI
4.1 Hydraulic loop
Booster sets are operated in open loop systems with geodetic head. In particular, in the case of large
geodetic height not all operating points are accessible for fixed speed pumps due to the switching of the
pumps. In order to keep the gaps in the accessible flow as small as possible, a hydraulic loop without
geodetic head is used for the determination of EEI. Then, the resistance curves which determine the
operating points of the booster set are purely parabolic (without geodetic part) and are of the type giv-
en by Formula (3):
H KQ⋅
resis tan ce
(3)
where the constant K depends on the setting of the throttle valve.
The booster head is given by Formula (1) in 3.11. To be independent of p , for the determination of EEI
s
the inlet pressure is defined to be atmospheric pressure, i.e. p = 0. On the other hand, when operating
s
booster sets in a test rig there exists typically a certain (and also slowly varying) inlet pressure p In
s.
8.2.7, a correction for the effect of p is described for the experimental determination of EEI.
s
4.2 Booster set
If in the booster set is/are integrated
• an expansion tank
• and/or a “jockey pump” as defined in 3.5
they shall not affect the EEI value.
Therefore, it has/they have
• to be deactivated during tests for determining EEI except a tank of a volume V ≤ 10 +
tank
(Q100 %/1m /h) litres,
• to be neglected in the SAM of the booster set.
NOTE: An expansion tank of the maximum volume defined above may be necessary during tests in respect to
the time-transient behaviour of the pressure control of variable speed booster sets.
=
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prEN 17038-3:2017 (E)
If a stand-by pump (as defined in 3.6) is integrated in the booster set, it has to be taken as one of the
total number of normal operating pumps for the determination of the values of Q and EEI according
100 %
to the procedures described in Clauses 8 and 9.
5 Reference flow-time profile and reference pressure control curve
5.1 Reference flow-time profile
The reference flow time profile for booster sets is defined by Table 2.
Table 2— Reference flow-time profile for booster sets
Flow Q in %
10 20 30 40 50 60 70 80 90 100
of Q
100 %
Time Δt in %
of total oper- 6 21 26 19 12 6 4 3 2 1
ating time
The value Q is defined by the condition that the corresponding hydraulic power P of the booster
100 % hyd
set is maximum.
The value Q100 % has to be determined by tests or by the SAM, the value written on the nameplate shall not be used.
5.2 Reference pressure control curve
The reference control curve for booster sets is defined by Formula (4):
H / H =100⋅0.75+ 0.25⋅ QQ/ [%]
( )
ref 100% 100%

(4)
The value H is the head of the booster set at the operating point Q = Q . The values H/H at the
100 % 100 % 100 %
corresponding values of Q/Q100 % of the reference flow-time profile are given according to Formula (4).
6 Rules to be applied for not accessible load points
For booster sets that are equipped with at least two but only fixed speed pumps, one or more load
points defined by Table 2 may not be stably adjustable. This is caused by the “jump” of the operating
point along the parabolic hydraulic resistance curve which arises when one of the pumps is switched on
or switched off. Then, only flow rates before or after the switching (located on the resulting Q-H curves
of the running pumps) can be adjusted and – in case of testing – the corresponding values of flow rate Q,
head H and electric power input P of the booster set can be measured.
In the case that a load point at the flow rate Q is not accessible within the allowed tolerances (e.g. for
ref,i
fixed speed boosters due to switching), for the calculation of P (see 8.3 or 9.9, respectively) the elec-
1,avg
tric power input P (Q ) at that load point has to set
1 ref,i
• equal to the electric power input P (Q ) (including corrections and penalties) at the nearest low-
1 lower
er accessible flow rate Q if Q ≥ Q – 0.05 ∙ Q
lower lower ref,i 100 %
• otherwise equal to the electric power input P (Q ) (including corrections and penalties) at the
1 higher
nearest higher accessible flow rate Q
higher
7 Penalties for deviations of the pressure control
In pressurized open loop systems, a proper supply is essential. An oversupply will result in waste of
energy, an undersupply will result in a breakdown of the supply. Even a temporal undersupply will not
be accepted by the user who would raise the control set point. For both types of pressure deviations at a
oSIST prEN 17038-3:2018
prEN 17038-3:2017 (E)
certain duty point – static and temporal – the procedure given below will introduce a penalty P
1, pen
which has to be added to the measured electric power input.
In the case of an oversupply, no additional penalty is added to the measured electric power input P .
1,meas
The punishment for an oversupply is inherently given by the increased electric power input.
If the determined head H falls below the requested value H according to the reference pressure
meas ref
control curve defined in 5.2 the averaged electric power input P is underrated as it is shown in Fig-
1,avg
ure 1. This leads to a deviation in EEI compared to measurements at values defined by the reference
pressure control curve H . Hence, a penalty is applied in this case. The electric power input is penalized
ref
such as if an undersupply in head by a value ΔH leads to the same electric power input as an oversupply
in head by ΔH, see Figure 1.
Figure 1 — Visualization of the penalty for booster sets
The penalty is calculated by Formula (5):
HQ − H Q
( ) ( )
ref i meas i
PQ=2⋅⋅ P Q
( ) ( )
1, pen i 1.meas i
HQ
( )
meas i
(5)
with the reference head (as defined in Formula 4)
p Q − pQ
( ) ( )
ref i s i
HQ =
( )
ref i
ρ⋅ g
(6)
≥
and the measured head
p Q − p Q
( ) ( )
measi si
HQ =
( )
meas i
ρ⋅ g
(7)
oSIST prEN 17038-3:2018
prEN 17038-3:2017 (E)
In the case of determining P by test (see Clause 8), the penalty has to be applied to each time-sample
1,avg
m during the measurement at a certain flow rate Q as follows:
i
•if H (Q ) ≥ H (Q ): PQ = P Q
meas,m i ref i ( ) ( )
1,mi 1,meas,mi
H QH− Q
( ) ( )
ref ,,m i meas m i
•if H (Q ) < H (Q ): P Q PQ+⋅2 ⋅ PQ
meas,m i ref i ( ) ( ) ( )
1,mi 1,meas,mi 1,meas,mi
HQ( )
meas,m i
wherein m denotes the time sample m and i is the consecutive number of the load point according to the
reference flow-time profile (see 5.1).
In this case, the resulting input power P1(Qi) at a duty point i is determined by averaging all corrected
time-samples P (Q ). The head is corrected using suction pressure compensation if necessary. As de-
1,m i
scribed in 8.2.7, for varying suction pressure H (Q ) and H (Q ) are determined by
ref i meas i
pQ − p Q
( ) ( )
ref i s,100% i
HQ =
( )
ref i
ρ⋅ g
(8)
p (Qp)− (Q)
meas i s,100% i
H QH
( )
meas i meas,comp
ρ⋅ g
(9)
8 Determination of average electric power input P by test
1,avg
8.1 General
8.1.1 Introduction
This section specifies performance tests and evaluations on booster sets which are carried out
• either by a company which places the booster set on the market and/or puts it into service,
• or by an independent institution in the frame of the verification procedure described in Part 1,
Clause 6, of this standard.
Such tests shall provide the necessary information on the actual performance values of test booster sets
needed for the calculation of the EEI-value according to its definition given in Part 1, Clause 4, of this
standard.
All provisions for the test concerning the booster set (taken as “black box” and treated as a pump unit
like those covered by Part 2 of this Standard) shall be in accordance with EN ISO 9906, class 2. The ex-
ception for power of 10 kW and below (as allowed for the application of EN ISO 9906 on acceptance
tests) shall not be valid.
All provisions for the test concerning electric motors if they are part of the booster set and are fed di-
rectly from an electric grid shall be in accordance with EN 60034-2-1.
All provisions for the test concerning a Power Drive System if is part of the booster set shall be in ac-
cordance with EN 61800-9-2.
8.1.2 Test conditions
Tests shall be carried out with clean cold water.
The duration of the test shall be sufficient to obtain repeatable results; especially run-in and warming-
up effects of the electric and electronic components of the unit shall be considered.
==
=
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prEN 17038-3:2017 (E)
NOTE: Run-in effects may take up to one day operating time.
The electric power supply of the test installation shall fulfil the requirements as specified in
EN 60034-1. This requires that
• the voltage shall be in accordance with 7.2 of EN 60038 and EN 60034-1,
• the frequency shall be within ± 0,3 % of the rated frequency during measurements.
8.1.3 Steady-state
All measurements shall be made under hydraulic and thermal steady-state conditions (see EN ISO 9906,
EN 60034-30-1, CLC/FprTS 60034-30-2, EN 60034-2-1, EN 60034-2-2 and EN 60034-2-3 and
EN 61800-9-2). Switching of individual pumps is not allowed within the measurement of one load point.
NOTE EN 61800-9-2 requests thermal stability for the PDS for measuring the maximum load point. All other
points can be measured quickly after measuring maximum load without waiting for the thermal stability.
8.1.4 Measuring instrumentation
For the test procedures described in 8.2 measuring instrumentation is needed for the determination of
• the flow rate Q,
• the head H,
• the suction pressure p
s
• the delivery pressure p
d
• the electric power P .
Since instrument accuracy is generally expressed as a percentage of full scale, the range of the instru-
ments chosen shall be as small as practical.
For analogue instruments, the maximum observed values should be in the upper third of the instrument
range.
The measuring equipment needed to determine the flow rate Q and the head H shall be selected in ac-
cordance with EN ISO 9906. Detailed information is given in Annex A.1 of EN ISO 9906.
Since instrument accuracy is generally expressed as a percentage of full scale, the range of the instru-
ments chosen shall be as small as practical.
For analogue instruments the observed values should be in the upper third of the instrument range.
The measuring equipment needed to determine the flow rate Q and the pump head H shall be selected
in accordance with EN ISO 9906. Detailed information is given in EN ISO 9906:2012, A.1.The electric
power P of the booster set is determined based on input voltages U and input currents I. All require-
ments concerning the instrumentation for the measurements of P shall be fulfilled according to
EN 60034-2-1.
8.1.5 Uncertainties of measured quantities
The total measurement uncertainties of the flow rate Q, the pump head H and the electric power P re-
sult from the combined effects of the measurement device uncertainty and of the random uncertainty
and can be determined as described in Part 1, Annex D, of this Standard. The random uncertainty can be
reduced by increasing the number of readings of a measured quantity at the same operating condition
(= load point) of the test booster set.
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NOTE For tests done by a company which is responsible for the qualification of booster sets (see Part 1,
Clause 5, of this standard), it is advisable to achieve total measurement uncertainties as small as possible, i.e.
smaller than the maximum permissible values specified by Standards.
For tests done by an independent institution in the frame of the verification procedure (see Part 1,
Clause 6, of this standard) the situation is different. In this case, the “pass-or-fail” result is strongly de-
pendent on the total measurement uncertainties. Therefore, to neutralize the influence of measurement
uncertainties on the verification result, the maximum permissible measurement uncertainties specified
in the relevant Standards have to be met and proven in tests which aim at the verification of the Energy
Efficiency Index (EEI).
8.1.6 Measurement rates and bandwidth of measurement equipment
For all measurement devices, the T rise time shall be in the range between 0,1 … 10 s.
63 %
8.2 Measurement procedure
8.2.1 Overview
The measurement procedure consists of the following steps which are explained in detail in the Sub-
clauses below.
1) Run-in effects may affect the power consumption of a booster during its initial operation. In order
to ensure a representative electric power input a run in of the booster is necessary (see 8.1.1). It is
recommended to run-in the booster with all pumps running at maximum speed and at different
flows.
2) Determine the 100 % point at maximum hydraulic power (Q100 %, H100 %, ps,100 %) as described in
8.2.2 and 8.2.3.
3) Parametrisation of the booster control for the determination of EEI according to its documentation
(if necessary by taking p into account). The control parameters used for the determination of EEI
s
have to be documented.
4) Measurements at reference load points for decreasing flow
a. adjust the flow according to the 100 % point
b. for each load point Q (defined in Table 2) from Q = Q to Q = Q in steps of 10 % of
ref,i ref,i 100 % ref,i 10 %
Q
100 %
i. adjust Q by adjusting the valve of the test bench (manually or automatically). Refer to
ref,i
8.2.4 for the adjustment tolerances,
ii. if Q cannot be adjusted follow the rule described in Clause 6,
ref,i
iii. deactivate flow adjustments of the test bench,
iv. wait for 2 min before recording the measurement data,
v. measure 30 s – 3 min at a sampling rate of 0,5 – 2 Hz the values Q(t ), p (t ), p (t ), P (t )
m s m d m 1 m
and calculate H(t ).
m
vi. check
(1) if the steady-state condition defined in 8.1.2 is fulfilled,
(2) if the arithmetic mean Q* of the flow values Q(t ) is within the adjustment tolerances
i j
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(see below),
If one of the conditions i or ii is not fulfilled repeat measurement starting from step a. If the
conditions are not fulfilled in the repeated measurement the measurement point is invalid
and has to be treated as a not accessible operation point (see Clause 6),
vii. For each time-sample m apply (if necessary)
1. suction-pressure correction as described in 8.2.7,
2. penalty as described in chapter 7.
c. calculate the arithmetic mean of the time-samples P* and Q* and apply (if necessary) correc-
1,i i
tion for deviation from the reference flow rate (according to 8.2.8) in order to calculate the rat-
ed P
1,i ,
d. apply the rule for not accessible load points (see Clause 6) or load points with flow rate devia-
tion (see 8.2.8),
e. calculate the weighted average electric power input for decreasing flow P as described in
1,avg,dec
8.3 using the measured and (corrected if necessary) values of P .
1,i
5) Repeat the measurement procedure described in 4) for increasing flow, starting at Q point from
10 %
Q = Q to Q = Q in steps of 10 % of Q .
10 % 100 % 100 %
6) Calculate the average input power consumption P as described in 8.3.
1,avg,inc
8.2.2 Determination of Q and H
100 % 100 %
As a first step of the test procedure, Q shall be determined.
100 %
For this purpose, values of flow rate Q, head H and electric power input P have to be measured for a
sufficient number of operating points around the expected value of Q . For the choice of these oper-
100 %
ating points, the value of Q approximately 1.1 ∙ z ∙ Q (with Q at n = n given in the
100 %,expected BEP,PU BEP,PU N,PU
documentation of the pump manufacturer) can be taken as a preliminary estimation for the expected
value of Q . It is important to take measurement data in a sufficiently large range of Q below and
100 %
above the expected value of Q . (Recommended are five measurement points in the range 0.8 ∙
100 %
Q < Q < 1.2 ∙ Q ).
100 % 100 %
If the value of Q calculated on the basis of the test points shows that less than two of the test points
100 %
were at values of Q greater than this calculated value, additional test points shall be added to generate
at least two test points at values of Q > Q .
100 %
The value Q can then be determined by the following steps:
100 %
1. Based on the measured values of Q and corresponding H, calculate the hydraulic power P accord-
hyd
ing to 3.12 for the test points.
2. Approximate the relation P = f(Q) by a polynomial of 3rd degree as a “best fit” function based on
hyd
the pairs of Q and P
hyd
P= AQ⋅ + B⋅Q+ C⋅+Q D
hyd P P P P
(10)
3. Calculate the value of Q by the formula
100 %
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
1 B 1 BC1
P PP
Q =−⋅ ± ⋅ − ⋅
100% 
39A AA3
P PP
(11)
resulting from Formula (11) (because of the double sign ± of the square root)
Of the 2 values of Q100 %
that one corresponds to the maximum of the Q- P -curve which is nearer to z∙Q .
hyd BEP,PU
4. Calculate the corresponding value of H by inserting Q = Q into formula (4). For testing, the
100 % 100 %
varying suction pressure has to be taken into account.
8.2.3 Determination of the suction pressure at 100 % flow rate
The determination of EEI by test assumes constant suction pressure independent of the flow rate at
atmospheric level. In the field, suction pressure is impacted by hydraulic losses of the test bench, result-
ing in higher suction pressure values at part load. As the defined control curve for booster sets remains
fixed, the delivered head deviates to lower values at part load. A suction pressure compensation has to
be applied in this case. The measurement of the suction pressure at 100 % flow rate can be done simul-
taneously to the determination of the 100 %-point described in 8.2.2.
In addition to Q and H , suction pressure p and discharge pressure p has to be measured. The
100 % 100 % s d
discharge pressure p at Q is denoted p . The corresponding value of the suction pressure p at
d 100 % d,100 % s
Q is denoted p (refer to Figure 2).
100 % s,100 %
Figure 2 — Determination of p
s,100 %
8.2.4 Adjustment of the reference control curve
Select
- 100 %-flow rate 100 %-delivery head
for adjustment according to adjustment accuracy of the booster set in test.
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In case of deviating suction pressure, the determined 100 %-suction pressure as determined acc. to
8.2.3 shall be considered as following:
Adjust the control curve such that the booster set operates in the H-Q-diagram in the same working
points as if there were atmospheric suction pressure. Therefore, the discharge pressure p and
d,100 %
p are calculated as follows:
d,0 %
p p +⋅⋅gH
ds,100% ,100% 100%
(12)
p p + 0,75⋅⋅⋅gH
ds,0% ,100% 100%
(13)
The corresponding discharge pressure at load point i is calculated by
Q
i
p Q p+ 0.25⋅ ρ⋅⋅gH
( )
ref i 0% 100%
Q
100%
(14)
All adjusted values are the basis of all forthcoming calculations.
8.2.5 Determination of reference load points
The relevant values of the flow rate Q at the reference load points shall be calculated by the following
i
formula:

1 Q
QQ=⋅⋅
i  100%
100 Q
100%
i
(15)
where the values (Q/Q ) in [%] which correspond to the N load points of the reference flow-time
100 % i
profile are taken from Table 2.
The values of the head H which correspond to the reference pressure control curve (see 5.2) shall be
i
calculated by the following formula:

1 H
HH⋅
i  100%
100 H
100%
i
(16)
where the values (H/H ) in [%] are taken from Formula 4.
100 % i
NOTE: For booster sets that can only be operated at fixed speed, the head cannot be adjusted to the reference
pressure control curve and follows the Q-H-characteristic of the booster set.
8.2.6 Adjustment tolerances
The measured flow rates Q may deviate from the exact values Q defined by the flow-time profile
meas ref
according to Table 2 due to the measurement procedure. Maximum allowed deviations are given by
Q – (0.05 ∙ Q ) ≤ Q ≤ Q + (0.05 ∙ Q ). (17)
ref 100% meas ref 100%
8.2.7 Suction pressure compensation
Compensate the pressure assuming identical efficiency of the booster set with and without suction
pressure. Calculate the electric power input for the case of atmospheric pressure by correcting
P
1,comp,i
the measured electric power input P . For the corresponding load point i, calculate
1,meas
=
=
=
=
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pp−
di, s,100%
PP⋅
1,comp,i 1,meas,i
pp−
d ,,i si
(18)
This approach is valid for Δp ≤0,2⋅⋅⋅gH .
s 100%
8.2.8 Corrections for deviations from reference flow rate
In tests, the adjusted flow rates Q* may deviate from the exact values Qref defined by the flow-time pro-
file according to Table 2
. Within the limits defined in 8.2.6 the measured power consumption P* is corrected to the value P by
1 1
the following formula:
0.75+ 0.25⋅ QQ
Q
( )
ref ,i 100%
ref ,i
**
P Q P Q⋅⋅
( ) ( )
1 ref ,i 1,meas i
*
*
Q
0.75+ QQ
( )
i
i 100%
(19)
8.3 Calculation of P1,avg
To determine the weighted average electric power input P perform the following steps:
1,avg
1) Measure the electric power input P as described in 8.2 for all values of the relative flow rate
Q/Q100 % defined by the reference flow-time profile (see Table 2 in 5.1). Perform the measurements
for increasing flow rate as well as for decreasing flow rate.
For not adjustable values Q/Q of the reference flow-time profile, apply the rule defined in Clause 6.
100 %
2) Calculate the weighted average of the electric power P by the formula
1,avg
i=10
 ∆t 

PP⋅
1,avg ∑ 1,i
i=1 
 i 
(20)
for increasing as well as for decreasing flow rate. The final value to be used for the determination of EEI
is the arithmetic mean of the two values P and P
1,avg,inc 1,avg,dec
PP+
1,avg,inc 1,avg,dec
P =
1,avg
(21)
Using this P the EEI can be determined according to Clause 11.
1,avg
9 Determination of average electric power input P by the means of a Semi-
1,avg
Analytical Model (SAM)
9.1 General
Instead of determining their EEI-value by performing tests on complete booster sets, the EEI-value can
be determined by mathematical calculations based on a so-called semi-analytical model (SAM) of the
booster set.
The mathematical model of the complete booster set is composed of part models of the pumps and of
the electric components (motors, PDSs) incorporated in the booster set. The complete model described
in this Clause takes into account the physical interactions of the hydraulic and electric components as
well as the pressure and switching control of the booster set. For the calculation of EEI-values these
=
=
=
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models may partly or completely be used. Alternatively, mathematical models delivering at least the
same accuracy of EEI-values are permitted.
NOTE For example, alternative mathematical models are permitted where the technology of components is
not covered in this Standard or other mathematical (part-)mod
...