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 European Standard specifies methods for testing the sound power level for water heating energy efficiency 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 means that domestic hot water production and space heating generation occur at the same time and may interact.
NOTE 2   For space heating functions, the requirements are given in EN 12102-1.
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 of 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
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-May-2019
Due Date
02-Aug-2019
Completion Date
07-Jun-2019

Buy Standard

Standard
SIST EN 12102-2:2019
English language
34 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 12102-2:2019
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
SIST EN 12102-2:2019 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 12102-2:2019
---------------------- Page: 2 ----------------------
SIST EN 12102-2:2019
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.
---------------------- Page: 3 ----------------------
SIST EN 12102-2:2019
EN 12102-2:2019 (E)
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

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

---------------------- Page: 4 ----------------------
SIST EN 12102-2:2019
EN 12102-2:2019 (E)

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

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

---------------------- Page: 5 ----------------------
SIST EN 12102-2:2019
EN 12102-2:2019 (E)
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.
---------------------- Page: 6 ----------------------
SIST EN 12102-2:2019
EN 12102-2:2019 (E)
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)

---------------------- Page: 7 ----------------------
SIST EN 12102-2:2019
EN 12102-2:2019 (E)

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 —
Speed of sound in air m/s
d In duct —
D Diameter mm
Total duration of heating min
E Duct end correction factor dB
f Centre frequency band Hz
i Indoor side of units —
A-weighted average sound power level dB(A)
Sound power level dB
A-weighted sound power level dB(A)
Sound power level travelling into the duct dB
o Outdoor side of units —
Rated heat output kW
Prated
R Refrigerant —
---------------------- Page: 8 ----------------------
SIST EN 12102-2:2019
EN 12102-2:2019 (E)
Symbol/Subscript Denomination Unit
S Area of the duct opening in the room
T Dry bulb temperature °C
Target hot water temperature °C
Initial water temperature in the tank °C
iniw
Maximum temperature measurement period min
MPmax
Minimum temperature measurement period min
MPmin
Set point temperature for production of hot water °C
set
Water temperature at the beginning of the test °C
start
t Theoretical time to reach T
min
Thw hw
Water inlet temperature °C
Water outlet temperature °C
VPD Volumic power density W/l
Declared volume of water tank l
tank
W/BR Water/brine —
Ω Solid of the radiation path from the test opening —
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.

---------------------- Page: 9 ----------------------
SIST EN 12102-2:2019
EN 12102-2:2019 (E)
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
noise radiated by the unit
noise radiated by the unit + inlet + outlet
noise radiated by the unit + inlet
noise radiated by the openings of both inlet and outlet
noise radiated by the outlet opening
noise radiated by the unit inlet
noise radiated by the unit outlet
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

only be measured by small draw-offs.
---------------------- Page: 10 ----------------------
SIST EN 12102-2:2019
EN 12102-2:2019 (E)

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

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

The target hot water temperatures T at which the measurement shall be done are defined in Annex C.

Reaching T is checked by small draw-offs, as specified in 5.5.
For units with VPD ≤ 10 W/l, the tolerance on T is ± 1,5 K.

For units with VPD > 10 W/l, there is no tolerance on T , because it is a target temperature used for

time calculation.
5.3 Volumic power density (VPD)
The VPD is defined in Formula (1) and expressed in W/l.
rated
VPD ×1000 (1)
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.
---------------------- Page: 11 ----------------------
SIST EN 12102-2:2019
EN 12102-2:2019 (E)
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
> 10 and ≤ 40 T – 20 K or 10 °C, whichever is higher
> 40 T – 35 K or 10 °C, whichever is higher
T has a tolerance of ± 2K.
iniw

If the measurement is performed at more than one target hot water temperature T during a single

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

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.
---------------------- Page: 12 ----------------------
SIST EN 12102-2:2019
EN 12102-2:2019 (E)
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

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.

---------------------- Page: 13 ----------------------
SIST EN 12102-2:2019
EN 12102-2:2019 (E)

At the end of the acoustic measurement, T shall be measured again for information. The acoustic

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

heating and in a continuous acoustic measurement when this temperature is in the vicinity of the target

temperature T .

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.
Table 4 — Period of storage tank temperature measurement
T measurement period
VPD
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.

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 .

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 im
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.