SIST EN 12102-2:2019

Air conditioners, liquid chilling packages, heat pumps, process chillers and dehumidifiers with electrically driven compressors - Determination of the sound power level - Part 2: Heat pump water heaters

This document specifies methods for testing the sound power level of air/water, brine/water, water/water and direct exchange/water heat pump water heaters and heat pump combination heaters with electrically driven compressors and connected to or including a domestic hot water storage tank for domestic hot water production.
This European Standard comprises only the testing procedure for the domestic hot water production of the heat pump system.
NOTE 1   Testing procedures for simultaneous operation for domestic hot water production and space heating are not treated in this standard. Simultaneous operation means that domestic hot water production and space heating generation occur at the same time and may interact.
NOTE 2   For space heating function, the requirements are given in EN 12102-1:2017.
This European Standard only applies to water heaters which are supplied in a package of heat pump and storage tank. In the case of water heaters consisting of several parts with refrigerant connections, this European Standard applies only to those designed and supplied as a complete package.
This European Standard does not specify requirements for the quality of the used water.

Luftkonditionierer, Flüssigkeitskühlsätze, Wärmepumpen, Prozesskühler und Entfeuchter mit elektrisch angetriebenen Verdichtern - Bestimmung des Schallleistungspegels - Teil 2: Wärmepumpen-Wassererwärmer

Climatiseurs, groupes refroidisseurs de liquide, pompes à chaleur, refroidisseurs industriels et déshumidificateurs avec compresseur entraîné par moteur électrique - Détermination du niveau de puissance acoustique - Partie 2: Pompe à chaleur pour la production d'eau chaude sanitaire

Klimatske naprave, enote za hlajenje kapljevine, toplotne črpalke, procesne hladilne naprave in razvlaževalniki z električnimi kompresorji - Ugotavljanje ravni zvočne moči - 2. del: Grelniki vode s toplotno črpalko

Ta evropski standard določa metode za preskušanje ravni zvočne moči za energetsko učinkovitost ogrevanja kombinacij zrak/voda, slanica/voda, voda/voda in neposredna izmenjava/voda grelnikov vode s toplotno črpalko ter kombiniranih grelnikov s toplotno črpalko z električno gnanimi kompresorji, ki so povezani z ali vključujejo rezervoar za toplo sanitarno vodo za proizvodnjo tople sanitarne vode. Ta evropski standard zajema le preskusni postopek za proizvodnjo tople sanitarne vode s sistemom toplotne črpalke. OPOMBA 1:   Ta standard ne obravnava preskusnih postopkov za sočasno delovanje proizvodnje tople sanitarne vode in ogrevanja prostorov. Sočasno pomeni, da proizvodnja tople sanitarne vode in ogrevanje prostorov potekata ob istem času, pri čemer lahko pride do medsebojnega vpliva. OPOMBA 2:   Za funkcije ogrevanja je treba upoštevati zahteve v standardu EN 12102-1. Ta evropski standard se uporablja samo za grelnike vode, ki so dobavljeni v kompletu s toplotno črpalko in rezervoarjem za vodo. Pri grelnikih vode, ki so sestavljeni iz več delov, s priključki za hladilno sredstvo se ta evropski standard uporablja samo za tiste, ki so zasnovani in dobavljeni kot celoten komplet. Ta evropski standard ne določa zahtev za kakovost uporabljene vode.

General Information

• Status: Published
• Public Enquiry End Date: 01-Feb-2018
• Publication Date: 06-Jun-2019
• ICS: 17.140.20 - Noise emitted by machines and equipment
• ICS: 27.080 - Heat pumps
• ICS: 91.140.65 - Water heating equipment
• Technical Committee: OGS - Heating for buildings
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 28-May-2019
• Due Date: 02-Aug-2019
• Completion Date: 07-Jun-2019
• Directive: 2009/125/EC - Directive 2005/32/EC of the European Parliament and of the Council of 6 July 2005 establishing a framework for the setting of ecodesign requirements for energy-using products and amending Council Directive 92/42/EEC and Directives 96/57/EC and 2000/55/EC of the European Parliament and of the Council
• Directive: 812/2013 - Commission Delegated Regulation (EU) No 812/2013 of 18 February 2013 supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to the energy labelling of water heaters, hot water storage tanks and packages of water heater and solar device
• Directive: 814/2013 - Commission Regulation (EU) No 814/2013 of 2 August 2013 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for water heaters and hot water storage tanks
• Mandate: M/495 - Standardisation mandate to CEN, CENELEC and ETSI under Directive 2009/125/EC relating to harmonised standards in the field of Ecodesign
• Mandate: M/534 - [C(2015)2625] Standardisation request to the European standardisation organisations pursuant to Article 10(1) of Regulation (EU) No 1025/2012 of the European Parliament and of the Council in support of implementation of Commission Regulation (EU) No 814/2013 of 2 August 2013 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for water heaters and hot water storage tanks and Commission Delegated Regulation (EU) No 812/2013 of 18 February 2013 supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to the energy labelling of water heaters, hot water storage tanks and packages of water heater and solar device
• Ref Project: EN 12102-2:2019 - Air conditioners, liquid chilling packages, heat pumps, process chillers and dehumidifiers with electrically driven compressors - Determination of the sound power level - Part 2: Heat pump water heaters

Overview

EN 12102-2:2019 - published by CEN - specifies standardized methods for determining the sound power level of heat pump water heaters. It covers air/water, brine/water, water/water and direct-exchange/water heat pump water heaters and combination units that are supplied as a packaged heat pump plus domestic hot water storage tank. The standard applies only to the domestic hot water (DHW) production function (simultaneous DHW and space‑heating operation is excluded) and does not set water quality requirements.

Key topics and technical requirements

• Scope and applicability
  • Applies to packaged units (heat pump + storage tank) designed and supplied as a complete package.
  • Excludes simultaneous DHW and space‑heating testing (see EN 12102-1:2017 for space heating).
• Acoustic characteristics
  • Defines sound power level metrics including A‑weighted levels and measurement frequency range.
• Measurement procedures
  • Test methods for units with different Volumic Power Density (VPD) thresholds: VPD ≤ 10 W/l and VPD > 10 W/l, with distinct operational and acoustic measurement steps.
  • Procedures for units with direct refrigerant-to-water heat exchangers (normative annex).
• Installation and test conditions
  • Requirements for setup, settings, ducted and non‑ducted configurations, bends and duct corrections, static pressure and airflow measurement.
• Data and reporting
  • Test report and laboratory register content, required non‑acoustic parameter measurements (temperatures, flow rates, rotation speed).
• Referenced measurement standards
  • Uses EN ISO acoustic and fan test standards (e.g., EN ISO 3741, EN ISO 3744, EN ISO 5801, EN ISO 9614).
• Informative and normative annexes
  • Target hot water temperatures, example measurement processes, and links to EU ecodesign and energy labelling requirements (Annex ZA/ZB).

Practical applications - who uses EN 12102-2:2019

• Manufacturers - to verify and declare noise performance of heat pump water heaters and to support product development and acoustic optimisation.
• Test laboratories and certification bodies - to perform repeatable, standardized acoustical tests for compliance and certification.
• HVAC designers and consultants - to compare noise data for system selection and to design installations (ducting, placement) that meet acoustic requirements.
• Regulatory compliance teams and procurement - to demonstrate conformity with European ecodesign and energy labelling frameworks where noise data are required.
• Acoustic engineers - for assessment, mitigation strategies and documentation of product sound power levels.

Related standards

• EN 12102-1:2017 (space heating sound power testing)
• EN 16147:2017 (performance and testing of domestic hot water heat pumps)
• EN ISO 3741 / 3743-1 / 3744 / 3745 / 3747 and EN ISO 9614 (acoustic measurement methods)
• EN ISO 5801 (fan performance testing)

Keywords: EN 12102-2:2019, heat pump water heaters, sound power level, acoustic testing, heat pumps, domestic hot water, VPD, CEN, ecodesign, energy labelling.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2019
Klimatske naprave, enote za hlajenje kapljevine, toplotne črpalke, procesne
hladilne naprave in razvlaževalniki z električnimi kompresorji - Ugotavljanje ravni
zvočne moči - 2. del: Grelniki vode s toplotno črpalko
Air conditioners, liquid chilling packages, heat pumps, process chillers and dehumidifiers
with electrically driven compressors - Determination of the sound power level - Part 2:
Heat pump water heaters
Luftkonditionierer, Flüssigkeitskühlsätze, Wärmepumpen, Prozesskühler und Entfeuchter
mit elektrisch angetriebenen Verdichtern - Bestimmung des Schallleistungspegels - Teil
2: Wärmepumpen-Wassererwärmer
Climatiseurs, groupes refroidisseurs de liquide, pompes à chaleur, refroidisseurs
industriels et déshumidificateurs avec compresseur entraîné par moteur électrique -
Détermination du niveau de puissance acoustique - Partie 2: Pompe à chaleur pour la
production d'eau chaude sanitaire
Ta slovenski standard je istoveten z: EN 12102-2:2019
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
27.080 Toplotne črpalke Heat pumps
91.140.65 Oprema za ogrevanje vode Water heating equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12102-2
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2019
EUROPÄISCHE NORM
ICS 17.140.20; 91.140.65
English Version
Air conditioners, liquid chilling packages, heat pumps,
process chillers and dehumidifiers with electrically driven
compressors - Determination of the sound power level -
Part 2: Heat pump water heaters
Climatiseurs, groupes refroidisseurs de liquide, Luftkonditionierer, Flüssigkeitskühlsätze,
pompes à chaleur, refroidisseurs industriels et Wärmepumpen, Prozesskühler und Entfeuchter mit
déshumidificateurs avec compresseur entraîné par elektrisch angetriebenen Verdichtern - Bestimmung
moteur électrique - Détermination du niveau de des Schallleistungspegels - Teil 2: Wärmepumpen-
puissance acoustique - Partie 2: Pompe à chaleur pour Wassererwärmer
la production d'eau chaude sanitaire
This European Standard was approved by CEN on 19 October 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 12102-2:2019 E
worldwide for CEN national Members.

Contents
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and symbols . 6
3.1 Terms and definitions . 6
3.2 Symbols, subscripts and units . 6
4 Acoustic characteristics . 7
5 Measurement procedure . 8
5.1 General approach . 8
5.2 Target hot water temperature T . 9
hw
5.3 Volumic power density (VPD) . 9
5.4 Water tank filling . 9
5.5 Water outlet temperature measurement . 10
5.6 Method for units with VPD ≤ 10 W/l . 11
5.6.1 Heat pump operation . 11
5.6.2 Acoustic measurement . 11
5.7 Method for units with VPD > 10 W/l . 12
5.8 Frosting . 13
5.9 Measurement of non-acoustic parameters . 13
5.10 Volume air flow rate and available external static pressure . 13
5.10.1 Non-ducted units . 13
5.10.2 Ducted units . 13
5.11 Rotation speed . 13
6 Test conditions . 14
7 Measuring requirements . 14
8 Installation of the unit . 16
8.1 General . 16
8.2 Settings . 17
8.2.1 General . 17
8.2.2 Settings for non-ducted air source units . 17
8.2.3 Setting the difference of temperature for heat pumps using a liquid as heat source . 17
8.3 Ducted configurations . 17
8.3.1 General . 17
8.3.2 Ducts with bends . 17
8.3.3 Duct construction . 18
8.3.4 Static pressure measurement . 19
8.4 Acoustic calculation. 20
8.4.1 General . 20
8.4.2 Duct end correction . 20
8.4.3 Bend correction BC . 21
9 Acoustic measurements methods . 22
9.1 General . 22
9.2 Test methods . 22
9.3 Frequency range . 23
10 Data management . 23
10.1 Test report . 23
10.1.1 General . 23
10.1.2 Unit specification . 23
10.1.3 Operating conditions, installation and environmental conditions . 23
10.2 Laboratory register . 24
Annex A (informative) Typical configuration of heat pumps . 25
Annex B (normative) Measurement procedure for heat pump water heaters with a direct
heat exchanger between the sanitary cold water and the refrigerant . 28
Annex C (normative) Target hot water temperature T . 29
hw
Annex D (informative) Example of measurement process for units with VPD > 10 W/l . 30
Annex ZA (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) No 814/2013 aimed to be covered . 33
Annex ZB (informative) Relationship between this European Standard and the energy
labelling requirements of Commission Delegated Regulation (EU) No 812/2013
aimed to be covered . 34

European foreword
This document (EN 12102-2:2019) has been prepared by Technical Committee CEN/TC 113 “Heat pumps
and air conditioning units”, the secretariat of which is held by UNE.
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.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA and Annex ZB, which are integral parts
of this document.
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.
1 Scope
This document specifies methods for testing the sound power level of air/water, brine/water,
water/water and direct exchange/water heat pump water heaters and heat pump combination heaters
with electrically driven compressors and connected to or including a domestic hot water storage tank for
domestic hot water production.
This European Standard comprises only the testing procedure for the domestic hot water production of
the heat pump system.
NOTE 1 Testing procedures for simultaneous operation for domestic hot water production and space heating are
not treated in this standard. Simultaneous operation means that domestic hot water production and space heating
generation occur at the same time and may interact.
NOTE 2 For space heating function, the requirements are given in EN 12102-1:2017.
This European Standard only applies to water heaters which are supplied in a package of heat pump and
storage tank. In the case of water heaters consisting of several parts with refrigerant connections, this
European Standard applies only to those designed and supplied as a complete package.
This European Standard does not specify requirements for the quality of the used water.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes 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 12102-1:2017, Air conditioners, liquid chilling packages, heat pumps, process chillers and dehumidifiers
with electrically driven compressors - Determination of the sound power level - Part 1: Air conditioners,
liquid chilling packages, heat pumps for space heating and cooling, dehumidifiers and process chillers
EN 14511-1, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling and
process chillers, with electrically driven compressors - Part 1: Terms and definitions
EN 14511-2, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling and
process chillers, with electrically driven compressors - Part 2: Test conditions
EN 14511-3, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling and
process chillers, with electrically driven compressors - Part 3: Test methods
EN 16147:2017, Heat pumps with electrically driven compressors - Testing, performance rating and
requirements for marking of domestic hot water units
EN ISO 3741:2010, Acoustics - Determination of sound power levels and sound energy levels of noise sources
using sound pressure - Precision methods for reverberation test rooms (ISO 3741:2010)
EN ISO 3743-1, Acoustics - Determination of sound power levels and sound energy levels of noise sources
using sound pressure - Engineering methods for small movable sources in reverberant fields - Part 1:
Comparison method for a hard-walled test room (ISO 3743-1:2010)
EN ISO 3744, Acoustics - Determination of sound power levels and sound energy levels of noise sources using
sound pressure - Engineering methods for an essentially free field over a reflecting plane (ISO 3744:2010)
EN ISO 3745, Acoustics - Determination of sound power levels and sound energy levels of noise sources using
sound pressure - Precision methods for anechoic rooms and hemi-anechoic rooms (ISO 3745:2012)
EN ISO 3747, Acoustics - Determination of sound power levels and sound energy levels of noise sources using
sound pressure - Engineering/survey methods for use in situ in a reverberant environment (ISO 3747:2010)
EN ISO 5801, Fans - Performance testing using standardized airways (ISO 5801:2017)
EN ISO 9614 (all parts), Acoustics - Determination of sound power levels of noise sources using sound
intensity
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 3741, EN ISO 3743-1,
EN ISO 3744, EN ISO 3745, EN ISO 3747, EN ISO 9614 (all parts), EN 14511-1, EN 16147 and EN 12102-1
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
3.2 Symbols, subscripts and units
The symbols, subscripts and units used in this document are given in Table 1.
Table 1 — Symbols, subscripts and units
Symbol/Subscript Denomination Unit
BC Bend correction mm
BR Brine —
c
Speed of sound in air m/s
o
d In duct —
D Diameter mm
D
Total duration of heating min
H
E Duct end correction factor dB
f Centre frequency band Hz
i Indoor side of units —
A-weighted average sound power level dB(A)

L
PA
L
Sound power level dB
w
L
A-weighted sound power level dB(A)
wA
L
Sound power level travelling into the duct dB
wd
o Outdoor side of units —
a
Rated heat output kW
Prated
R Refrigerant —
Symbol/Subscript Denomination Unit
S Area of the duct opening in the room
m
T Dry bulb temperature °C
T
Target hot water temperature °C
hw
T
Initial water temperature in the tank °C
iniw
t
Maximum temperature measurement period min
MPmax
t
Minimum temperature measurement period min
MPmin
T
Set point temperature for production of hot water °C
set
T
Water temperature at the beginning of the test °C
start
t Theoretical time to reach T
min
Thw hw
T
Water inlet temperature °C
wi
T
Water outlet temperature °C
wo
VPD Volumic power density W/l
V
Declared volume of water tank l
tank
W/BR Water/brine —
Ω Solid of the radiation path from the test opening —
a
As given in EN 16147.
4 Acoustic characteristics
Table 2 lists the relevant acoustic characteristics, corrected for duct end and bend corrections where
relevant, for the typical configurations of heat pump water heaters illustrated in Annex A.
Table 2 — Acoustic characteristics of typical configurations
Heat source / heat Figure in
Outdoors Indoors Inlet duct Outlet duct
Annex A
pump configuration
Non heated space air — ② — — A.1
Indoor air — ② — — A.2
Ground source — ① — — A.3
Outdoor air ② — — — A.4
Non heated space air
⑤ ③ — — A.5
ducted outlet
Outdoor air ducted
④ ① — — A.6
inlet/outlet
⑥ + duct end
correction +
Exhaust air – individual
⑤ ① bend — A.7
ventilation
correction (if
any)
⑥ + duct end ⑦ + duct end
correction + correction +
Exhaust air – collective
— ① bend bend A.8
ventilation
correction (if correction (if
any) any)
Outdoor air split ② ⑧ — — A.9, A.10
Ambient air split ② ① — — A.11
Roll bond panel ⑧ ① — — A.12
①
noise radiated by the unit
②
noise radiated by the unit + inlet + outlet
③
noise radiated by the unit + inlet
④
noise radiated by the openings of both inlet and outlet
⑤
noise radiated by the outlet opening
⑥
noise radiated by the unit inlet
⑦
noise radiated by the unit outlet
⑧
noise not to be measured
5 Measurement procedure
5.1 General approach
According to the capacity of the unit and the volume of its tank, defined by the volumic power density
(VPD) in W/l, the heating time can dramatically change. The goal is to perform the acoustic measurement
when the water tank temperature reaches the target hot water temperature T . This temperature shall
hw
only be measured by small draw-offs.
Previous studies showed that the noise generated by units is unsteady compared to other HVAC devices.
This is why a longer sound pressure averaging of 3 min is required.
For units with small VPD, the water tank temperature increases slowly and will not dramatically change
during the time necessary to perform acoustic measurement. Fifteen minutes are given to perform this
task, allowing some time-consuming processes of the standards (e.g. increase the number of microphone
positions).
For units with large VPD, the water tank temperature increases quickly. The sound power level shall be
continuously measured during the water tank heating, with several small draw-offs. Then the acoustic
values corresponding to the target water tank temperature T shall be deduced from the evolution of
hw
temperature versus time.
The measurement procedure for heat pump water heaters with a direct heat exchanger between the
sanitary cold water and the refrigerant is given in Annex B.
5.2 Target hot water temperature T
hw
The target hot water temperatures T at which the measurement shall be done are defined in Annex C.
hw
Reaching T is checked by small draw-offs, as specified in 5.5.
hw
For units with VPD ≤ 10 W/l, the tolerance on T is ± 1,5 K.
hw
For units with VPD > 10 W/l, there is no tolerance on T , because it is a target temperature used for
hw
time calculation.
5.3 Volumic power density (VPD)
The VPD is defined in Formula (1) and expressed in W/l.
P
rated
VPD ×1000 (1)
V
tank
where
Prated is the declared heating capacity (kW).
Vtank is the declared volume of the water tank (l);
The measurement procedure depends on the VPD value:
— For units with a VPD ≤ 10 W/l, see 5.6;
— For units with a VPD > 10 W/l, see 5.7.
5.4 Water tank filling
The tank shall be fully filled with water at the temperature given in Table 3. The heat pump is then
switched on.
=
Table 3 — Initial water temperature in the tank T
iniw
VPD Tiniw
W/l °C
≤ 10 T – 5 K or 10 °C, whichever is higher
hw
> 10 and ≤ 40 T – 20 K or 10 °C, whichever is higher
hw
> 40 T – 35 K or 10 °C, whichever is higher
hw
T has a tolerance of ± 2K.
iniw
If the measurement is performed at more than one target hot water temperature T during a single
hw
heating-up, the initial temperature requirement only applies to the lowest target hot water temperature.
The tank is considered to be filled at the required temperature when the temperatures at the outlet and
inlet fulfil the relation given in Formula (2).
TT− <1K (2)
wo wi
5.5 Water outlet temperature measurement
The water outlet temperature T is measured at the storage tank outlet, by doing small draw-offs of the
wo
water.
They shall be done according to the following procedure:
1) Tap water with a flow rate between 2,8 and 3,2 l/min during 25 to 35 s (in order to purge and to
stabilize the temperature probe),
2) Then measure the temperature for 10 s with a flow rate between 2,8 and 3,2 l/min. The temperature
measurement sampling shall be done with at least 1 value every 2 s. The temperature is the average
of the measurements over these 10 s.
The water temperatures are measured in the centre of the flow, as close as possible to the appliance, as
shown in Figure 1.
Key
1 temperature probe
2 draw-off
Figure 1 — Distance for the temperature measurement
The difference between the lowest and highest temperature shall not exceed 0,15 K.
In order to compensate the draw-offs, the tank shall be filled with water at temperature as defined in 5.4.
NOTE For practical reasons, it is possible to use another way to follow the water tank inner temperature. In
this case, only draw off measurements are considered.
5.6 Method for units with VPD ≤ 10 W/l
5.6.1 Heat pump operation
When the storage tank is full of water at the temperature specified in Table 3, the acoustic measurement
shall begin as soon as the two following conditions are achieved:
— T is within the target hot water temperature range outlet T ;
wo hw
— continuous run of the compressor for a minimum of 30 min immediately before the acoustic
measurement; otherwise, circulate a volume of V at the temperature specified in Table 3 while
tank
the unit is still running and start the measurement when the target temperature is reached.
5.6.2 Acoustic measurement
The sound measurement of the unit shall start as soon as the target temperature is reached.
To avoid a significant change of the T during measurement process, the total duration of the sound
wo
measurement shall not be longer than 15 min.
Due to the non-steady-state operation of the heat pump water heater resulting in variability of sound
level, the averaging time shall be 3 min.
NOTE This averaging can be arranged as the average of several measurements over shorter periods. For
example, a unitary measurement time of 30 s will require the average of 6 acquisitions.
At the end of the acoustic measurement, T shall be measured again for information. The acoustic
wo
measurement shall be reported with the average value of the temperatures measured just before and
after the acoustic measurement.
5.7 Method for units with VPD > 10 W/l
The method consists in the several time-stamped measurements of T throughout the water tank
wo
heating and in a continuous acoustic measurement when this temperature is in the vicinity of the target
temperature T .
hw
Below the target temperature T , the period of time-stamped T , expressed as temperature
hw wo
measurement period, t , shall be in accordance with Table 4.
MP
Table 4 — Period of storage tank temperature measurement
T measurement period
VPD
wo
W/l min
tMPmin tMPmax
10 < VPD ≤ 40 7 10
VPD > 40 3 5
Any acoustic measurement done during a draw-off shall not be used due to the water flow noise.
The compressor shall run for at least 30 min immediately before the acoustic measurement. If the target
temperature is reached before this time period, the test procedure is immediately restarted without the
30 min requirement. The time of compressor run before the begining of the test shall be stated in the test
report.
The acoustic measurement shall be done with continuous sequential acquisitions of 1 min.
From the beginning of the heating period, determine several T according to 5.5 and to Table 4.
wo
After the second measurement of T , the theoretical time for reaching the target temperature T is
wo hw
calculated by linear interpolation This estimation of time is refined after each new measurement of T .
wo
When the period between the time of the current T measurement and the theoretical time of T is
wo hw
comprised between 2 × t and t , then the acoustic measurement shall start immediately.
MPmin MPmin
This requirement avoids any draw-off during the acoustic measurement.
After the estimated time of reaching T , stop the acoustic measurement and perform another T
hw wo
measurement, which shall be between t and t after the theoretical time of T given at the
MPmin MPmax hw
last valid T measurement. If the unit stops before this time, T shall be immediately determined.
wo wo
The exact time corresponding to T (without tolerance) is calculated by linear regression from the time-
hw
stamped T just before and after. The sound power level is determined by averaging the sound power
wo
level on three minutes:
— measurement at the exact time;
— measurement the minute before;
— measurement the minute after.
An example of measurement process for units with VPD > 10 W/l is given in Annex D.
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