EN 50440:2015
(Main)Efficiency of domestic electrical storage water heaters and testing methods
Efficiency of domestic electrical storage water heaters and testing methods
This European Standard specifies methods for measuring the performance of electric storage water heaters for the production of sanitary hot water for household and similar use. The object is to state and define the principal performance characteristics of electric storage water heaters and to describe the test methods for measuring these characteristics. NOTE 1 This standard does not apply to; - storage water heaters that use electricity as a secondary source of heating the water; - storage water heaters that do not use a tank to storage hot water - electric storage water heaters that do not meet the minimum (or maximum) output performance of the smallest (or biggest) load profile, as defined in Table 4. NOTE 2 This standard does not specify performance or safety requirements. For safety requirements see EN 60335-1 in conjunction with EN 60335-2-21.
Effizienz von elektrischen Warmwasserspeichern für den Hausgebrauch und Prüfverfahren
Efficacité des chauffe-eau électriques à accumulation et méthodes associées
La présente Norme européenne spécifie des méthodes de mesure de l’aptitude à la fonction des chauffe-eau électriques à accumulation pour la production d'eau chaude sanitaire à usage domestique et analogue. Elle a pour objet de préciser et de définir les principales caractéristiques d’aptitude à la fonction des chauffe-eau électriques à accumulation et de décrire les méthodes d'essai pour la mesure de ces caractéristiques. NOTE 1 La présente norme ne s'applique pas aux: - chauffe-eau à accumulation qui utilisent l'électricité en tant que source secondaire de chauffage de l'eau; - chauffe-eau à accumulation qui n'utilisent pas un réservoir de stockage d'eau chaude - chauffe-eau électriques à accumulation qui ne répondent pas au rendement minimal (ou maximal) du plus petit (ou plus grand) profil de charge, tel que défini dans le Tableau 4. NOTE 2 La présente norme ne spécifie pas les exigences en matière d’aptitude à la fonction ou de sécurité. Pour les exigences de sécurité, voir l’EN 60335-1 conjointement avec l'EN 60335-2-21.
Učinkovitost gospodinjskih električnih akumulacijskih grelnikov vode in preskusne metode
Ta evropski standard določa metode za merjenje učinkovitosti električnih akumulacijskih grelnikov vode za pripravo tople vode za gospodinjstva in za podobno uporabo. Namen je navesti in opredeliti glavne značilnosti delovanja električnih akumulacijskih grelnikov vode ter opisati preskusne metode za merjenje teh značilnosti.
OPOMBA 1: Ta standard se ne uporablja za:
– akumulacijske grelnike vode, ki uporabljajo elektriko kot pomožni vir ogrevanja vode;
– akumulacijske grelnike vode, ki ne uporabljajo rezervoarjev za akumulacijo vroče vode;
– električne akumulacijske grelnike vode, ki ne izpolnjujejo minimalne (ali maksimalne) zmogljivosti izhoda najmanjšega (ali največjega) profila obremenitve, kot je opredeljen v preglednici 4.
OPOMBA 2: Ta standard ne določa zahteve glede učinkovitosti ali varnostnih zahtev. Za varnostne zahteve glejte EN 60335-1 v povezavi z EN 60335-2-21.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2016
8þLQNRYLWRVWJRVSRGLQMVNLKHOHNWULþQLKDNXPXODFLMVNLKJUHOQLNRYYRGHLQ
SUHVNXVQHPHWRGH
Efficiency of domestic electrical storage water heaters and testing methods
Wirkungsgrad von elektrischen Warmwasserspeichern für den Hausgebrauch
Efficacité des chauffe-eau électriques à accumulation
Ta slovenski standard je istoveten z: EN 50440:2015
ICS:
91.140.65 Oprema za ogrevanje vode Water heating equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 50440
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2015
ICS 91.140.65
English Version
Efficiency of domestic electrical storage water heaters and
testing methods
Efficacité des chauffe-eau électriques à accumulation et Effizienz von elektrischen Warmwasserspeichern für den
méthodes associées Hausgebrauch
This European Standard was approved by CENELEC on 2015-10-05. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50440:2015 E
Content
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Symbols and Units . 5
5 Calculation of the electrical energy efficiency (h ) . 6
elecwh
6 Measured parameters . 6
7 General conditions for measurements . 6
8 Reference conditions . 7
9 Test procedures . 9
10 Data Report .18
Annex A (normative) Calculation of the specific energy efficiency and of the Annual
Consumption of electric energy .19
Annex ZZA (informative) .21
Annex ZZB (informative) .22
Bibliography .23
European foreword
This document (EN 50440:2015) has been prepared by CLC/TC 59X "Performance of household and
similar electrical appliances".
The following dates are fixed:
• latest date by which this document has
(dop) 2016-10-05
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national
(dow) 2018-10-05
standards conflicting with this
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directives see informative Annexes ZZA and ZZB, which are integral
parts of this document.
1 Scope
This European Standard specifies methods for measuring the performance of electric storage water
heaters for the production of sanitary hot water for household and similar use.
The object is to state and define the principal performance characteristics of electric storage water
heaters and to describe the test methods for measuring these characteristics.
NOTE 1 This standard does not apply to;
− storage water heaters that use electricity as a secondary source of heating the water;
− storage water heaters that do not use a tank to storage hot water;
− electric storage water heaters that do not meet the minimum (or maximum) output performance of the smallest (or biggest)
load profile, as defined in Table 4.
NOTE 2 This standard does not specify performance or safety requirements. For safety requirements see EN 60335-1 in
conjunction with EN 60335-2-21.
2 Normative references
Not applicable.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
storage water heater
water heater that uses electric heating elements as the means of heating water for long-term storage
in a thermally insulated container and provided with a device to control the water temperature
3.2
primary function
to heat water for the production of hot water for household and similar needs
3.3
energized storage water heater
storage water heater that is designed to supply hot water and energised for 24 h per day
3.4
off-peak storage water heater
storage water heater that is designed to supply hot water whilst only being supplied with electrical
energy at off-peak/low tariff periods
Note 1 to entry: The off-peak storage water heater is required to fulfil the requirements of the tapping pattern between 7:00h
and 22:00h without external energy supply, e.g. to enable operation at off-peak/low-tariff periods and/or to operate in conditions
of insecurity of energy supply. A product qualifies as “off-peak” if it is only energized for a maximum of 8 consecutive hours
anywhere between 22:00h and 7:00h during the test with the 24h tapping pattern.
3.5
load profile
means the output performance (in terms of flow-rates, temperatures, tapping pattern, etc.) of a storage
water heater when fulfilling its primary function under specific ambient conditions (see Tables 3 and 4),
as declared by the manufacturer
3.6
energy efficiency
means the ratio between the delivered energy in the sanitary hot water for its load profile and the
consumed electrical energy
3.7
storage volume
rated quantity of water stored in the appliance
Note 1 to entry: This is declared in litres.
3.8
smart control
device that automatically adapts the water heating process to individual usage conditions with the aim
of reducing energy consumption
3.9
out of the box-mode
standard operating condition, setting or mode set by the manufacturer at factory level, to be active
immediately after the appliance installation, suitable for normal use by the end-user according to the
water tapping pattern for which the product has been designed and placed on the market
4 Symbols and Units
Table 1 – Symbols
Unit Description
Symbol
[%] Energy efficiency of a storage water heater.
h
elecwh
Q [kWh] Reference energy for the 24 h tapping pattern for the load profile of the water
ref
heater.
Q [kWh] Electricity consumption with the relevant 24 h tapping pattern.
elec
[°C]
θ´ mean water temperature for the determination of θ , measured at the outlet
p p
f [l/min] Minimum flow rate which hot water is contributing to the reference energy as
specified in Table 4.
T [°C] The water temperature at which hot water starts contributing to the reference
m
energy as specified in table 4
T [°C] Minimum water temperature to be achieved during water draw off as specified
p
in Table 4
Q [kWh] Measured electricity consumption over 24 h test (step 4).
testelec
Q Useful energy content of the hot water of n drawn-offs
[kWh]
H2O
full−drawing
Sum of quantity of hot water totally delivered during the tapping period.
[litres]
V
water
V
[litres] Measured volume delivered at the mean water temperature.
40_exp
°
V
[litres] Mixed water quantity delivered at 40 C.
C [litres] Actual capacity of Water Heater
act
m [kg] Actual weight of water contained inside the tank of the Water Heater
act
smart Presence or not of smart control (value shall be 0 or 1).
SCF Efficiency gain by smart control function.
5 Calculation of the electrical energy efficiency (h )
elecwh
The electrical energy efficiency (h ) of a storage water heater is the ratio between the delivered
elecwh
energy in the hot water for the tapping pattern of its load profile and the consumed energy. The
consumed energy is the result of the test of the water heater with adjustments for:
− smart control that can reduce the energy consumption
The electrical energy efficiency of a storage water heater shall be calculated as Formula 1:
Q
ref
h =
(1)
elecwh
Q (1−SCF⋅smart)
elec
where:
Q is the delivered energy for the 24 h tapping pattern for the load profile of the water heater,
ref
in kWh;
Q
is the consumption of electric energy with the relevant 24 h tapping pattern, in kWh;
elec
smart indicates the presence of smart control and is yes = 1, no = 0;
NOTE SCF=0 in case no smart control is detected during testing (9.2).
6 Measured parameters
The parameters below shall be established following the measurement methods described in following
Clauses 7 and 9:
a) electricity consumption [kWh/d];
b) electrical energy efficiency [%];
c) storage volume [litre].
7 General conditions for measurements
Measurements shall be carried out with a supply of:
Table 2 – Electricity
Permissible
Uncertainty of
deviation
Measured quantity Unit Value measurement Notes
(average over
(accuracy)
test period)
Electricity
Power W ± 2 %
energy kWh ± 2 %
voltage, test-period > 48 h V 230/ 400 ± 4 % ± 0,5 %
voltage, test-period < 48 h V 230/ 400 ± 2 % ± 0,5 %
electric current A ± 0,5 %
frequency Hz 50 ± 1 %
Table 3 gives additional test conditions and tolerances for test outputs (i.e. thermal energy).
Table 3 – Test conditions and outputs. Set values and tolerances
Permissible
Permissible
deviations Uncertainty
deviation
of of
Measured quantity Unit Value (average Notes
individual measurement
over test
measured (accuracy)
period)
values
Time
Time s ± 0,1 s
Maximum interval between samples
s 3
(during the deliver of hot water)
Maximum interval between samples
s 60
(during the no-deliver of hot water)
Sanitary water
cold water temperature °C/ K 10 °C +/- 1 K +/- 1 K +/- 0,5 K*
cold water pressure MPa 0,3 MPa ± 5 %
a, b
hot water temperature °C/ K pattern +/- 0,5 K*
volume flowrate l / min pattern ± 1 %
volume measurements l ± 0,5 %
± 2 % ± 2 % ± 2 % c
thermal energy kWh pattern
(overall) (or ±10Wh) (or ±10Wh)
Ambient air
Temperature °C/ K 20 °C ± 1 K ± 1 K
a To be measured by "rapid response thermometer", meaning an instrument that registers within 1 s. at least 90% of the final
temperature rise from 15 to 100 °C when the sensor is plunged in still water.
b Thermocouple with a maximum diameter of 0,5mm, centred in stream, directly at outlet
c Apart from the maximum deviation a correction factor Qref/QH2O is applied, whereby Qref is taken from Table 4 and QH2O
is the energy content of the useful water actually delivered during the test. "Useful water" is water with a temperature higher
than a threshold value Tm for tappings in a profile specified in Table 4.
*Together with the publication task it should be mentioned towards the Commission that this tolerance is hard or
really not to be reached in practice.
All other installation requirements are made according to the manufacturer’s instructions.
8 Reference conditions
Table 4 specifies the tapping patterns for the chosen Load Profile. Parameters in the table are:
a) Load Profile [XXS-4XL, in header row of table];
b) h hour [hh:mm] starting at 0:00 h;
c) Q [kWh] useful energy content of water withdrawal to be achieved in the draw-off;
tap
d) f [l/min] minimum flow rate to be reached during tapping;
e) T [°C] temperature from which counting of useful energy content starts;
m
f) T [°C] minimum (peak) temperature to be achieved during tappi
...
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