IEC 62552-3:2015

IEC 62552-3 ®
Edition 1.1 2020-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household refrigerating appliances – Characteristics and test methods –
Part 3: Energy consumption and volume

Appareils de réfrigération à usage ménager – Caractéristiques et méthodes
d'essai –
Partie 3: Consommation d'énergie et volume

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IEC 60000 ®
Edition 1.1 2020-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household refrigerating appliances – Characteristics and test methods –

Part 3: Energy consumption and volume

Appareils de réfrigération à usage ménager – Caractéristiques et méthodes

d'essai –
Partie 3: Consommation d'énergie et volume

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.030 ISBN 978-2-8322-9139-9

IEC 62552-3 ®
Edition 1.1 2020-11
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Household refrigerating appliances – Characteristics and test methods –
Part 3: Energy consumption and volume

Appareils de réfrigération à usage ménager – Caractéristiques et méthodes
d'essai –
Partie 3: Consommation d'énergie et volume

– 2 – IEC 62552-3:2015+AMD1:2020 CSV
© IEC 2020
CONTENTS
FOREWORD . 8
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 12
3 Terms, definitions and symbols. 12
3.1 Terms and definitions . 12
3.2 Symbols . 13
4 Applicable test steps for determination of energy and volume . 13
4.1 Setup for energy testing . 13
4.2 Steady state power consumption . 13
4.3 Defrost and recovery energy and temperature change . 13
4.4 Defrost frequency . 13
4.5 Number of test points and interpolation . 13
4.6 Load processing efficiency . 14
4.7 Specified auxiliaries . 14
4.8 Volume determination . 14
5 Target temperatures for energy determination . 14
5.1 General . 14
5.2 Temperature control settings for energy consumption test . 15
6 Determination of energy consumption . 15
6.1 General . 15
6.2 Objective . 16
6.3 Number of test runs . 17
6.4 Steady state power consumption . 17
6.5 Defrost and recovery energy and temperature change . 17
6.6 Defrost interval . 18
6.7 Specified auxiliaries . 18
6.8 Calculation of energy consumption . 18
6.8.1 General . 18
6.8.2 Daily energy consumption . 18
6.8.3 Interpolation . 19
6.8.4 Specified auxiliaries . 19
6.8.5 Total energy consumption . 20
7 Circumvention devices . 20
8 Uncertainty of measurement . 21
9 Test report . 21
Annex A (normative) Set up for energy testing . 22
A.1 General . 22
A.2 Additional set up requirements for energy testing . 22
A.2.1 Ice making trays . 22
A.2.2 User adjustable controls . 22
A.2.3 Ambient temperature . 22
A.2.4 Accessories and shelves . 22
A.2.5 Anti-condensation heaters . 23
A.2.6 Automatic icemakers – ice storage bins . 23

© IEC 2020
Annex B (normative) Determination of steady state power and temperature . 26
B.1 General . 26
B.2 Setup for testing and data collection . 26
B.3 Case SS1: no defrost control cycle or where stability is established for a
period between defrosts . 26
B.3.1 Case SS1 approach . 26
B.3.2 Case SS1 acceptance criteria . 29
B.3.3 Case SS1 calculation of values . 30
B.4 Case SS2: steady state determined between defrosts . 30
B.4.1 Case SS2 approach . 30
B.4.2 Case SS2 acceptance criteria . 32
B.4.3 Case SS2 calculation of values . 33
B.5 Correction of steady state power . 34
Annex C (normative) Defrost and recovery energy and temperature change . 36
C.1 General . 36
C.2 Setup for testing and data collection . 36
C.3 Case DF1: where steady state operation can normally be established before
and after defrosts . 37
C.3.1 Case DF1 approach . 37
C.3.2 Case DF1 acceptance criteria . 39
C.3.3 Case DF1 calculation of values . 40
C.4 Number of valid defrost and recovery periods . 42
C.5 Calculation of representative defrost energy and temperature . 42
Annex D (normative) Defrost interval . 44
D.1 General . 44
D.2 Elapsed time defrost controllers . 44
D.3 Compressor run time defrost controllers . 45
D.4 Variable defrost controllers . 49
D.4.1 General . 49
D.4.2 Variable defrost controllers – declared defrost intervals . 49
D.4.3 Variable defrost controllers – no declared defrost intervals (demand
defrost) . 50
D.4.4 Variable defrost controllers – non compliant . 50
Annex E (normative) Interpolation of results. 52
E.1 General . 52
E.2 Temperature adjustment prior to interpolation . 53
E.3 Case 1: linear interpolation – two test points . 53
E.3.1 General . 53
E.3.2 Requirements . 53
E.3.3 Calculations . 53
E.4 Case 2: triangulation – three (or more) test points. 57
E.4.1 General . 57
E.4.2 Requirements for two (or more) compartment triangulation . 58
E.4.3 Calculations for two compartment triangulation – manual interpolation . 61
E.4.4 Calculations for two compartment triangulation – matrices . 62
E.4.5 Checking temperature validity where there are more than two
compartments for triangulation. 64
E.4.6 Calculations for three compartment triangulation – matrices . 65
Annex F (normative) Energy consumption of specified auxiliaries . 69

– 4 – IEC 62552-3:2015+AMD1:2020 CSV
© IEC 2020
F.1 Purpose . 69
F.2 Ambient controlled anti-condensation heaters . 69
F.2.1 Outline of the method . 69
F.2.2 Measurement procedure . 69
F.2.3 Data requirements . 70
F.2.4 Regional weather data . 70
F.2.5 Calculation of power consumption . 70
F.2.6 Where anti-condensation heater(s) cannot be disabled but their power
consumption can be measured directly . 71
F.2.7 Where anti-condensation heater(s) cannot be disabled and their power
consumption cannot be measured directly . 72
F.2.8 Where anti-condensation heater(s) has a user-adjustable setting . 72
F.3 Automatic icemakers – energy to make ice . 72
F.3.1 General . 72
F.3.2 Tank type automatic icemakers . 72
Annex G (normative) Determination of load processing efficiency . 79
G.1 Purpose . 79
G.2 General description . 79
G.3 Setup, equipment and preparation . 80
G.3.1 General . 80
G.3.2 Equipment . 81
G.3.3 Quantity of water to be processed . 81
G.3.4 Position of the water load in compartments . 82
G.3.5 Temperature of the water to be processed . 85
G.4 Load processing efficiency test method . 86
G.4.1 Commencement of the load processing efficiency test . 86
G.4.2 Placement of the load . 86
G.4.3 Measurements to be taken . 87
G.4.4 Conclusion of load processing efficiency test . 87
G.5 Determination of load processing efficiency . 88
G.5.1 General . 88
G.5.2 Quantification of input energy . 89
G.5.3 Quantification of additional energy used to process the load . 90
G.5.4 Load processing efficiency. 92
G.5.5 Load processing multiplier . 92
G.5.6 Addition of user related loads into daily energy . 94
Annex H (normative) Determination of volume . 96
H.1 Scope . 96
H.2 Total volume . 96
H.2.1 Volume measurements . 96
H.2.2 Determination of volume . 96
H.2.3 Volume of evaporator space . 97
H.2.4 Two-star sections and/or compartments . 97
H.3 Key for Figures H.1 through H.5 . 97
H.4 Calculation of the volume of the section or sub-compartment in the
compartment whose target temperatures are different from each other . 100
Annex I (informative) Worked examples of energy consumption calculations. 103
I.1 Example calculation of daily energy consumption . 103
I.2 Variable defrost – calculation of defrost intervals . 104

© IEC 2020
I.3 Examples of Interpolation. 105
I.3.1 General . 105
I.3.2 Linear interpolation . 105
I.3.3 Two compartments – manual triangulation . 114
I.3.4 Two compartments – triangulation using matrices . 118
I.3.5 Three compartments – triangulation using matrices . 120
I.4 Calculating the energy impact of internal temperature changes . 122
I.4.1 General . 122
I.4.2 One compartment . 122
I.4.3 Triangulation . 123
I.5 Automatically controlled anti-condensation heater(s) . 124
I.6 Calculation of load processing efficiency . 126
I.7 Determination of annual energy consumption . 128
I.8 Examples of determination of power and temperature from raw data . 129
I.8.1 Manual review of data . 129
I.8.2 Review of data and selection of minimum spread using bespoke
software . 149
Annex J (informative) Development of the IEC global test method for refrigerating
appliances . 151
J.1 Purpose . 151
J.2 Overview. 151
J.3 Test method objective . 151
J.4 Description of key components of energy consumption . 152
Annex K (normative) Analysis of a refrigerating appliance without steady state
between defrosts . 154
K.1 Purpose . 154
K.2 Products with regular characteristics but without steady state operation . 154
K.2.1 General . 154
K.2.2 Special case DF2 approach . 154
K.2.3 Case DF2 acceptance criteria . 155
K.2.4 Case DF2 calculation of values . 155
Annex L (informative) Derivation of ambient temperature correction formula . 157
L.1 Purpose . 157
L.2 Background. 157
L.3 Approach . 158

Figure B.1 – Illustration of a test period made of blocks of 5 temperature control cycles
– temperatures for Case SS1 . 27
Figure B.2 – Illustration of a test period made of blocks of 5 temperature control cycles
– power for Case SS1 . 28
Figure B.3 – Case SS2 – typical operation of a refrigerating appliance with a defrost

control cycle . 31
Figure C.1 – Conceptual illustration of the additional energy associated with a defrost
and recovery period . 37
Figure C.2 – Case DF1 with steady state operation before and after a defrost . 38
Figure E.1 – Interpolation where temperatures change in multiple compartments
(compartment D critical) . 56
Figure E.2 – Interpolation with valid results in both Compartment A and B . 56
Figure E.3 – Interpolation with no valid results . 57

– 6 – IEC 62552-3:2015+AMD1:2020 CSV
© IEC 2020
Figure E.4 – Schematic representation of interpolation by triangulation . 59
Figure G.1 – Conceptual illustration of the load processing efficiency test . 80
Figure G.2 – Shelf locations and loading sequence (example showing 10 PET bottles) . 83
Figure G.3 – Ice cube tray locations and clearances . 85
Figure G.4 – Representation of the additional energy to process the added load . 89
Figure G.5 – Case where a defrost and recovery period occurs during load processing . 91
Figure H.1 – Basic view of top mounted freezer appliance . 98
Figure H.2 – Automatic ice-maker dispenser and chute . 99
Figure H.3 – Automatic ice-making compartment . 99
Figure H.4 – Rail of drawer type shelves or baskets . 100
Figure H.5 – Rotary divider of fresh food compartment for French Doors . 100
Figure H.6 – Part with partition in the freezer is a two-star compartment (or a chill
compartment next to a fresh food compartment) . 101
Figure H.7 – Part without partition next to the freezer or fresh food compartment is a
two-star compartment or a chill compartment, respectively . 101
Figure H.8 – Freezer door shelves are a two-star section . 101
Figure H.9 – Drawer in the freezer is a two-star section (or a chill sub-compartment in
a fresh food compartment) . 102
Figure H.10 – Space between a door shelf and drawer-type two-star section . 102
Figure I.1 – Example linear interpolation two compartments (Compartment B critical) . 107
Figure I.2 – Example linear interpolation two compartments (Compartment B critical) . 108
Figure I.3 – Example Interpolation where both test points have both compartments
below target (two valid results) . 109
Figure I.4 – Example Interpolation where both test points have both compartments
below target (two valid results) . 110
Figure I.5 – Example Interpolation where neither test point has both compartments
below target (no valid results) . 111
Figure I.6 – Example Interpolation where neither test point has both compartments
below target (no valid results) . 112
Figure I.7 – Example Interpolation for 4 compartments . 114
Figure I.8 – Example of triangulation (temperatures) . 116
Figure I.9 – Example of triangulation (temperature and energy) . 117
Figure I.10 – An example of power and temperature data . 130
Figure I.11 – Example of finding a test period with minimum spread in power . 150
Figure K.1 – Special Case SS2 – where steady state operation is never reached

between defrost and recovery periods and Annex C stability may not be established . 154

Table 1 – Target temperatures for energy determination by compartment type . 15
Table B.1 – Assumed ∆COP adjustment . 35
Table F.1 – Format for temperature and humidity data – ambient controlled anti-
condensation heaters . 71
Table I.1 – Example of linear interpolation, single compartment . 105
Table I.2 – Example 1 of linear interpolation, two compartments . 106
Table I.3 – Example 2 of linear interpolation, two compartments . 108
Table I.4 – Example 3 of linear interpolation, two compartments . 110
Table I.5 – Example of linear interpolation, test data for four compartments . 112

© IEC 2020
Table I.6 – Example of linear interpolation, results for four compartments . 114
Table I.7 – Example of triangulation, two compartments. 115
Table I.8 – Example of triangulation, three compartments . 120
Table I.9 – Example of population-weighted humidity probabilities and heater wattages
at 16 °C, 22 °C and 32 °C . 125
Table I.10 – An example of calculation of energy, power and temperature for each
temperature control cycle (TCC) . 131
Table I.11 – An example of calculation of energy, power and temperature for all
possible blocks (size = 3 TCC) . 133
Table I.12 – An example of calculation of energy, power and temperature for all
possible test periods (3 blocks each of 3 TCC) . 135
Table I.13 – An example of calculation of energy, power and temperature for all
possible blocks (size = 5 TCC) . 138
Table I.14 – An example of calculation of energy, power and temperature for all
possible blocks (size = 9 TCC) . 140
Table I.15 – An example of calculation of energy, power and temperature for all
possible test periods (3 blocks each of 5 TCC) . 142
Table I.16 – An example of calculation of energy, power and temperature for all
possible test periods (3 blocks each of 9 TCC) . 144
Table I.17 – Determination of defrost validity DF1 . 146
Table I.18 – Determination of steady state values using SS2 . 148
Table L.1 – Assumed relative insulation value for multi-compartment products . 160

– 8 – IEC 62552-3:2015+AMD1:2020 CSV
© IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD REFRIGERATING APPLIANCES –
CHARACTERISTICS AND TEST METHODS –

Part 3: Energy consumption and volume

FOREWORD
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This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 62552-3 edition 1.1 contains the first edition (2015-02) [documents 59M/63/FDIS and
59M/66/RVD] and its amendment 1 (2020-11) [documents 59M/128/FDIS and
59M/134/RVD].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
© IEC 2020
Standard IEC 62552-3 has been prepared by subcommittee 59M: Performance of electrical
household and similar cooling and freezing appliances, of IEC technical committee 59:
Performance of household and similar electrical appliances
IEC 62552-1, IEC 62552-2 and IEC 62552-3 together constitute a technical revision and
include the following significant technical changes with respect to IEC 62552:2007:
a) All parts of the standard have been largely rewritten and updated to cope with new testing
requirements, new product configurations, the advent of electronic product controls and
computer based test-room data collection and processing equipment.
b) In Part 1 there are some changes to test room equipment specifications and the setup for
testing to provide additional flexibility especially when testing multiple appliances in a
single test room.
c) For more efficient analysis and to better characterise the key product characteristics
under different operating conditions, the test data from many of the energy tests in Part 3
(this part) is now split into components (such as steady state operation and defrost and
recovery). The approach to determination of energy consumption has been completely
revised, with many internal checks now included to ensure that data complying with the
requirements of the standard is as accurate as possible and of high quality.
d) Part 3 (this part) now provides a method to quantify each of the relevant energy
components and approaches on how these can be combined to estimate energy under
different conditions on the expectation that different regions will select components and
weightings that are most applicable when setting both their local performance and energy
efficiency criteria while using a single set of global test measurements.
e) For energy consumption measurements in Part 3 (this part), no thermal mass (test
packages) is included in any compartment and compartment temperatures are based on
the average of air temperature sensors (compared to the temperature in the warmest test
package). There are also significant differences in the position of temperature sensors in
unfrozen compartments.
f) The energy consumption test in Part 3 (this part) now has two specified ambient
temperatures (16°C and 32°C).
g) While, in Part 2 test packages are still used for the storage test to confirm performance in
different operating conditions, in Part 1 they have been standardised to one size (100 mm
× 100 mm × 50 mm) to simply loading and reduce test variability. A clearance of at least
15 mm is now specified between test packages and the compartment liner.
h) A load processing energy efficiency test has been added in Part 3 (this part).
i) A tank-type ice making energy efficiency test has been added in Part 3 (this part).
j) A cooling capacity test has been added in Part 2.
k) A pull-down test has been added in Part 2.
l) Shelf area and storage volume measurement methods are no longer included. In Part 3
the volume measurement has been revised to be the total internal volume with only
components necessary for the satisfactory operation of the refrigeration system
considered as being in place.
m) Tests (both performance (Part 2) and energy (Part 3 – this part)) have been added for
wine storage appliances.
The following print types are used in this international standard:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
– Words in bold are defined in IEC 62552-1:2015, Clause 3 or in this part.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 10 – IEC 62552-3:2015+AMD1:2020 CSV
© IEC 2020
A list of all parts in the IEC 62252 series, published under the general title Household
refrigerating appliances – characteristics and test methods, can be found on the IEC website.
The committee has decided that the contents of the base publication and its amendment will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
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IEC 62
...

IEC 62552-3 ®
Edition 1.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household refrigerating appliances – Characteristics and test methods –
Part 3: Energy consumption and volume

Appareils de réfrigération à usage ménager – Caractéristiques et méthodes
d'essai –
Partie 3: Consommation d'énergie et volume

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IEC 62552-3 ®
Edition 1.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household refrigerating appliances – Characteristics and test methods –

Part 3: Energy consumption and volume

Appareils de réfrigération à usage ménager – Caractéristiques et méthodes

d'essai –
Partie 3: Consommation d'énergie et volume

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.030 ISBN 978-2-8322-2229-4

– 2 – IEC 62552-3:2015 © IEC 2015
CONTENTS
FOREWORD . 8
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 12
3 Terms, definitions and symbols. 12
3.1 Terms and definitions . 12
3.2 Symbols . 13
4 Applicable test steps for determination of energy and volume . 13
4.1 Setup for energy testing . 13
4.2 Steady state power consumption . 13
4.3 Defrost and recovery energy and temperature change . 13
4.4 Defrost frequency . 13
4.5 Number of test points and interpolation . 13
4.6 Load processing efficiency . 14
4.7 Specified auxiliaries . 14
4.8 Volume determination . 14
5 Target temperatures for energy determination . 14
5.1 General . 14
5.2 Temperature control settings for energy consumption test . 15
6 Determination of energy consumption . 15
6.1 General . 15
6.2 Objective . 16
6.3 Number of test runs . 17
6.4 Steady state power consumption . 17
6.5 Defrost and recovery energy and temperature change . 17
6.6 Defrost interval . 18
6.7 Specified auxiliaries . 18
6.8 Calculation of energy consumption . 18
6.8.1 General . 18
6.8.2 Daily energy consumption . 18
6.8.3 Interpolation . 19
6.8.4 Specified auxiliaries . 19
6.8.5 Total energy consumption . 20
7 Circumvention devices . 20
8 Uncertainty of measurement . 21
9 Test report . 21
Annex A (normative) Set up for energy testing . 22
A.1 General . 22
A.2 Additional set up requirements for energy testing . 22
A.2.1 Ice making trays . 22
A.2.2 User adjustable controls . 22
A.2.3 Ambient temperature . 22
A.2.4 Accessories and shelves . 22
A.2.5 Anti-condensation heaters . 23
A.2.6 Automatic icemakers – ice storage bins . 23

Annex B (normative) Determination of steady state power and temperature . 26
B.1 General . 26
B.2 Setup for testing and data collection . 26
B.3 Case SS1: no defrost control cycle or where stability is established for a
period between defrosts . 26
B.3.1 Case SS1 approach . 26
B.3.2 Case SS1 acceptance criteria . 29
B.3.3 Case SS1 calculation of values . 30
B.4 Case SS2: steady state determined between defrosts . 30
B.4.1 Case SS2 approach . 30
B.4.2 Case SS2 acceptance criteria . 32
B.4.3 Case SS2 calculation of values . 33
B.5 Correction of steady state power . 34
Annex C (normative) Defrost and recovery energy and temperature change . 36
C.1 General . 36
C.2 Setup for testing and data collection . 36
C.3 Case DF1: where steady state operation can normally be established before
and after defrosts . 37
C.3.1 Case DF1 approach . 37
C.3.2 Case DF1 acceptance criteria . 39
C.3.3 Case DF1 calculation of values . 40
C.4 Number of valid defrost and recovery periods . 42
C.5 Calculation of representative defrost energy and temperature . 42
Annex D (normative) Defrost interval . 44
D.1 General . 44
D.2 Elapsed time defrost controllers . 44
D.3 Compressor run time defrost controllers . 45
D.4 Variable defrost controllers . 47
D.4.1 General . 47
D.4.2 Variable defrost controllers – declared defrost intervals . 48
D.4.3 Variable defrost controllers – no declared defrost intervals (demand
defrost) . 48
D.4.4 Variable defrost controllers – non compliant . 49
Annex E (normative) Interpolation of results. 50
E.1 General . 50
E.2 Temperature adjustment prior to interpolation . 51
E.3 Case 1: linear interpolation – two test points . 51
E.3.1 General . 51
E.3.2 Requirements . 51
E.3.3 Calculations . 51
E.4 Case 2: triangulation – three (or more) test points. 55
E.4.1 General . 55
E.4.2 Requirements for two (or more) compartment triangulation . 56
E.4.3 Calculations for two compartment triangulation – manual interpolation . 59
E.4.4 Calculations for two compartment triangulation – matrices . 60
E.4.5 Checking temperature validity where there are more than two
compartments for triangulation. 62
E.4.6 Calculations for three compartment triangulation – matrices . 63
Annex F (normative) Energy consumption of specified auxiliaries . 67

– 4 – IEC 62552-3:2015 © IEC 2015
F.1 Purpose . 67
F.2 Ambient controlled anti-condensation heaters . 67
F.2.1 Outline of the method . 67
F.2.2 Measurement procedure . 67
F.2.3 Data requirements . 68
F.2.4 Regional weather data . 68
F.2.5 Calculation of power consumption . 68
F.2.6 Where anti-condensation heater(s) cannot be disabled but their power
consumption can be measured directly . 69
F.2.7 Where anti-condensation heater(s) cannot be disabled and their power
consumption cannot be measured directly . 70
F.2.8 Where anti-condensation heater(s) has a user-adjustable setting . 70
F.3 Automatic icemakers – energy to make ice . 70
F.3.1 General . 70
F.3.2 Tank type automatic icemakers . 70
Annex G (normative) Determination of load processing efficiency . 77
G.1 Purpose . 77
G.2 General description . 77
G.3 Setup, equipment and preparation . 78
G.3.1 General . 78
G.3.2 Equipment . 79
G.3.3 Quantity of water to be processed . 79
G.3.4 Position of the water load in compartments . 80
G.3.5 Temperature of the water to be processed . 83
G.4 Load processing efficiency test method . 84
G.4.1 Commencement of the load processing efficiency test . 84
G.4.2 Placement of the load . 84
G.4.3 Measurements to be taken . 85
G.4.4 Conclusion of load processing efficiency test . 85
G.5 Determination of load processing efficiency . 86
G.5.1 General . 86
G.5.2 Quantification of input energy . 87
G.5.3 Quantification of additional energy used to process the load . 88
G.5.4 Load processing efficiency. 89
G.5.5 Load processing multiplier . 90
G.5.6 Addition of user related loads into daily energy . 91
Annex H (normative) Determination of volume . 93
H.1 Scope . 93
H.2 Total volume . 93
H.2.1 Volume measurements . 93
H.2.2 Determination of volume . 93
H.2.3 Volume of evaporator space . 93
H.2.4 Two-star sections and/or compartments . 94
H.3 Key for Figures H.1 through H.5 . 94
Annex I (informative) Worked examples of energy consumption calculations. 98
I.1 Example calculation of daily energy consumption . 98
I.2 Variable defrost – calculation of defrost intervals . 99
I.3 Examples of Interpolation. 100
I.3.1 General . 100

I.3.2 Linear interpolation . 100
I.3.3 Two compartments – manual triangulation . 109
I.3.4 Two compartments – triangulation using matrices . 113
I.3.5 Three compartments – triangulation using matrices . 115
I.4 Calculating the energy impact of internal temperature changes . 117
I.4.1 General . 117
I.4.2 One compartment . 117
I.4.3 Triangulation . 118
I.5 Automatically controlled anti-condensation heater(s) . 119
I.6 Calculation of load processing efficiency . 121
I.7 Determination of annual energy consumption . 123
I.8 Examples of determination of power and temperature from raw data . 124
I.8.1 Manual review of data . 124
I.8.2 Review of data and selection of minimum spread using bespoke
software . 144
Annex J (informative) Development of the IEC global test method for refrigerating
appliances . 146
J.1 Purpose . 146
J.2 Overview. 146
J.3 Test method objective . 146
J.4 Description of key components of energy consumption . 147
Annex K (normative) Analysis of a refrigerating appliance without steady state
between defrosts . 149
K.1 Purpose . 149
K.2 Products with regular characteristics but without steady state operation . 149
K.2.1 General . 149
K.2.2 Special case DF2 approach . 149
K.2.3 Case DF2 acceptance criteria . 150
K.2.4 Case DF2 calculation of values . 150
Annex L (informative) Derivation of ambient temperature correction formula . 152
L.1 Purpose . 152
L.2 Background. 152
L.3 Approach . 153

Figure B.1 – Illustration of a test period made of blocks of 5 temperature control cycles
– temperatures for Case SS1 . 27
Figure B.2 – Illustration of a test period made of blocks of 5 temperature control cycles
– power for Case SS1 . 28
Figure B.3 – Case SS2 – typical operation of a refrigerating appliance with a defrost
control cycle . 31
Figure C.1 – Conceptual illustration of the additional energy associated with a defrost
and recovery period . 37
Figure C.2 – Case DF1 with steady state operation before and after a defrost . 38
Figure E.1 – Interpolation where temperatures change in multiple compartments
(compartment D critical) . 54
Figure E.2 – Interpolation with valid results in both Compartment A and B . 54
Figure E.3 – Interpolation with no valid results . 55
Figure E.4 – Schematic representation of interpolation by triangulation . 57
Figure G.1 – Conceptual illustration of the load processing efficiency test . 78

– 6 – IEC 62552-3:2015 © IEC 2015
Figure G.2 – Shelf locations and loading sequence (example showing 10 PET bottles) . 81
Figure G.3 – Ice cube tray locations and clearances . 83
Figure G.4 – Representation of the additional energy to process the added load . 87
Figure G.5 – Case where a defrost and recovery period occurs during load processing . 89
Figure H.1 – Basic view of top mounted freezer appliance . 95
Figure H.2 – Automatic ice-maker dispenser and chute . 96
Figure H.3 – Automatic ice-making compartment . 96
Figure H.4 – Rail of drawer type shelves or baskets . 97
Figure H.5 – Rotary divider of fresh food compartment for French Doors . 97
Figure I.1 – Example linear interpolation two compartments (Compartment B critical) . 102
Figure I.2 – Example linear interpolation two compartments (Compartment B critical) . 103
Figure I.3 – Example Interpolation where both test points have both compartments
below target (two valid results) . 104
Figure I.4 – Example Interpolation where both test points have both compartments
below target (two valid results) . 105
Figure I.5 – Example Interpolation where neither test point has both compartments
below target (no valid results) . 106
Figure I.6 – Example Interpolation where neither test point has both compartments
below target (no valid results) . 107
Figure I.7 – Example Interpolation for 4 compartments . 109
Figure I.8 – Example of triangulation (temperatures) . 111
Figure I.9 – Example of triangulation (temperature and energy) . 112
Figure I.10 – An example of power and temperature data . 125
Figure I.11 – Example of finding a test period with minimum spread in power . 145
Figure K.1 – Special Case SS2 – where steady state operation is never reached
between defrost and recovery periods and Annex C stability may not be established . 149

Table 1 – Target temperatures for energy determination by compartment type . 15
Table B.1 – Assumed ∆COP adjustment . 35
Table F.1 – Format for temperature and humidity data – ambient controlled anti-
condensation heaters . 69
Table I.1 – Example of linear interpolation, single compartment . 100
Table I.2 – Example 1 of linear interpolation, two compartments . 101
Table I.3 – Example 2 of linear interpolation, two compartments . 103
Table I.4 – Example 3 of linear interpolation, two compartments . 105
Table I.5 – Example of linear interpolation, test data for four compartments . 107
Table I.6 – Example of linear interpolation, results for four compartments . 109
Table I.7 – Example of triangulation, two compartments. 110
Table I.8 – Example of triangulation, three compartments . 115
Table I.9 – Example of population-weighted humidity probabilities and heater wattages
at 16 °C, 22 °C and 32 °C . 120
Table I.10 – An example of calculation of energy, power and temperature for each
temperature control cycle (TCC) . 126
Table I.11 – An example of calculation of energy, power and temperature for all
possible blocks (size = 3 TCC) . 128

Table I.12 – An example of calculation of energy, power and temperature for all
possible test periods (3 blocks each of 3 TCC) . 130
Table I.13 – An example of calculation of energy, power and temperature for all
possible blocks (size = 5 TCC) . 133
Table I.14 – An example of calculation of energy, power and temperature for all
possible blocks (size = 9 TCC) . 135
Table I.15 – An example of calculation of energy, power and temperature for all
possible test periods (3 blocks each of 5 TCC) . 137
Table I.16 – An example of calculation of energy, power and temperature for all
possible test periods (3 blocks each of 9 TCC) . 139
Table I.17 – Determination of defrost validity DF1 . 141
Table I.18 – Determination of steady state values using SS2 . 143
Table L.1 – Assumed relative insulation value for multi-compartment products . 155

– 8 – IEC 62552-3:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD REFRIGERATING APPLIANCES –
CHARACTERISTICS AND TEST METHODS –

Part 3: Energy consumption and volume

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
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other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62552-3 has been prepared by subcommittee 59M: Performance
of electrical household and similar cooling and freezing appliances, of IEC technical
committee 59: Performance of household and similar electrical appliances
IEC 62552-1, IEC 62552-2 and IEC 62552-3 cancel and replace the first edition of IEC 62552
published in 2007. IEC 62552-1, IEC 62552-2 and IEC 62552-3 together constitute a technical
revision and include the following significant technical changes with respect to
IEC 62552:2007:
a) All parts of the standard have been largely rewritten and updated to cope with new testing
requirements, new product configurations, the advent of electronic product controls and
computer based test-room data collection and processing equipment.
b) In Part 1 there are some changes to test room equipment specifications and the setup for
testing to provide additional flexibility especially when testing multiple appliances in a
single test room.
c) For more efficient analysis and to better characterise the key product characteristics under
different operating conditions, the test data from many of the energy tests in Part 3 (this
part) is now split into components (such as steady state operation and defrost and
recovery). The approach to determination of energy consumption has been completely
revised, with many internal checks now included to ensure that data complying with the
requirements of the standard is as accurate as possible and of high quality.
d) Part 3 (this part) now provides a method to quantify each of the relevant energy
components and approaches on how these can be combined to estimate energy under
different conditions on the expectation that different regions will select components and
weightings that are most applicable when setting both their local performance and energy
efficiency criteria while using a single set of global test measurements.
e) For energy consumption measurements in Part 3 (this part), no thermal mass (test
packages) is included in any compartment and compartment temperatures are based on
the average of air temperature sensors (compared to the temperature in the warmest test
package). There are also significant differences in the position of temperature sensors in
unfrozen compartments.
f) The energy consumption test in Part 3 (this part) now has two specified ambient
temperatures (16°C and 32°C).
g) While, in Part 2 test packages are still used for the storage test to confirm performance in
different operating conditions, in Part 1 they have been standardised to one size (100 mm
× 100 mm × 50 mm) to simply loading and reduce test variability. A clearance of at least
15 mm is now specified between test packages and the compartment liner.
h) A load processing energy efficiency test has been added in Part 3 (this part).
i) A tank-type ice making energy efficiency test has been added in Part 3 (this part).
j) A cooling capacity test has been added in Part 2.
k) A pull-down test has been added in Part 2.
l) Shelf area and storage volume measurement methods are no longer included. In Part 3
the volume measurement has been revised to be the total internal volume with only
components necessary for the satisfactory operation of the refrigeration system
considered as being in place.
m) Tests (both performance (Part 2) and energy (Part 3 – this part)) have been added for
wine storage appliances.
The following print types are used in this international standard:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
– Words in bold are defined in IEC 62552-1:2015, Clause 3 or in this part.
The text of this standard is based on the following documents:
FDIS Report on voting
59M/63/FDIS 59M/66/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 62252 series, published under the general title Household
refrigerating appliances – characteristics and test methods, can be found on the IEC website.

– 10 – IEC 62552-3:2015 © IEC 2015
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
INTRODUCTION
IEC 62552 is split into 3 parts as follows:
• IEC 62552-1: Scope, definitions, instrumentation, test room and set up of refrigerating
products;
• IEC 62552-2: General performance requirements for refrigerating appliances and
methods for testing them;
• IEC 62552-3: Energy consumption and volume determination (this part).

– 12 – IEC 62552-3:2015 © IEC 2015
HOUSEHOLD REFRIGERATING APPLIANCES –
CHARACTERISTICS AND TEST METHODS –

Part 3: Energy consumption and volume

1 Scope
This part of IEC 62552 specifies the essential characteristics of household and similar
refrigerating appliances cooled by internal natural convection or forced air circulation, and
establishes test methods for checking these characteristics.
This part of IEC 62552 describes the methods for the determination of energy consumption
characteristics and defines how these can be assembled to estimate energy consumption
under different usage and climate conditions. This part of IEC 62552 also defines the
determination of volume.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its ap
...