IEC PAS 63124:2017

IEC PAS 63124 ®
Edition 1.0 2017-06
PUBLICLY AVAILABLE
SPECIFICATION
PRE-STANDARD
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Tumble dryers for commercial use – Methods for measuring the performance

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IEC PAS 63124 ®
Edition 1.0 2017-06
PUBLICLY AVAILABLE
SPECIFICATION
PRE-STANDARD
colour
inside
Tumble dryers for commercial use – Methods for measuring the performance

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.060 ISBN 978-2-8322-4519-4

– 2 – IEC PAS 63124:2017 © IEC 2017
CONTENTS
FOREWORD . 6
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and symbols. 8
3.1 Terms and definitions . 8
3.2 List of symbols . 11
4 Requirements . 12
4.1 General . 12
4.2 Rated capacity . 13
4.3 Dimensions . 13
5 Test conditions, materials, equipment and instrumentation . 13
5.1 General . 13
5.2 Ambient conditions. 14
5.2.1 Electricity supply . 14
5.2.2 Water supply . 14
5.2.3 Ambient temperature and humidity . 15
5.3 Test materials . 15
5.3.1 General . 15
5.3.2 Test load . 15
5.3.3 Detergent . 16
5.4 Equipment . 16
5.4.1 Equipment for normalization . 16
5.4.2 Equipment for conditioning the test load . 16
5.4.3 Equipment for wetting the test load prior to a test . 16
5.4.4 Equipment for measurement . 16
5.5 Instrumentation and accuracy . 17
6 Preparation for testing . 17
6.1 General . 17
6.2 Test specifications from manufacturers . 18
6.3 Installation of the tumble dryer . 18
6.4 Preparation of the tumble dryer for a test series . 18
6.5 Preparation of the tumble dryer for a test run . 18
6.6 Preparation of test loads . 19
6.6.1 General . 19
6.6.2 Pre-treatment of new test load items prior to use . 19
6.6.3 Requirements regarding the age of test load items . 19
6.6.4 Normalization of test load items . 19
6.6.5 Conditioning of test load items . 20
6.6.6 Test load composition . 20
6.6.7 Wetting . 22
7 Performance measurements – General requirements . 23
8 Tests for performance. 24
8.1 General . 24
8.2 Test procedure for performance tests . 24
8.2.1 Test conditions, materials and preparation for testing . 24
8.2.2 Programme . 24

8.2.3 Test load . 25
8.2.4 Test procedure . 25
8.2.5 Validity of a test run . 25
8.2.6 Validity of a test series . 25
8.3 Measurements to determine water and energy consumption and programme
time . 26
8.3.1 General . 26
8.3.2 Procedure . 26
8.4 Measurements to determine condensation efficiency . 26
8.4.1 General . 26
8.4.2 Procedure . 27
8.5 Measurements to determine exhaust air volume . 27
8.6 Performance measurement at maximum exhaust duct pressure . 27
8.7 Measurement of the textile drying temperature . 27
9 Assessment of performance . 27
9.1 General . 27
9.2 Final moisture content of the load . 28
9.3 Total energy . 28
9.4 Corrected energy . 28
9.5 Corrected water consumption . 29
9.6 Corrected programme time . 29
9.7 Condensation efficiency . 30
9.8 Evaporation capacity . 31
9.9 Exhaust air volume . 31
10 Data to be reported. 31
Annex A (normative) Reference list . 32
A.1 Reference detergent . 32
A.2 Specification of test load . 32
A.3 The bone dry method of conditioning . 32
A.4 Uncertainty of measurement . 32
A.5 Environmental aspects of tumble dryer use . 32
A.6 Source of materials and supplies . 32
A.7 Washing machine for normalization . 32
Annex B (normative) Exhaust ducts for tumble dryer testing . 33
B.1 General . 33
B.2 Specification of the exhaust duct type 1 . 33
B.2.1 Duct material . 33
B.2.2 The form of the duct . 33
B.2.3 Instrumentation . 34
B.3 Exhaust duct type 2 . 34
B.3.1 General . 34
B.3.2 Specification of exhaust duct Type 2. 34
B.3.3 Setting the correct exhaust duct pressure . 34
Annex C (informative) Flow diagrams . 38
Annex D (normative) Test report – Data to be reported . 41
Annex E (normative) Procedure to determine test load size where rated capacity is not
declared. 45
E.1 General . 45

– 4 – IEC PAS 63124:2017 © IEC 2017
E.2 Determination of the volume of the clothes container . 45
E.3 Determination of the test load . 45
Annex F (normative) Flexible initial moisture content method . 46
F.1 General . 46
F.2 Procedure . 46
F.3 Evaluation . 46
Annex G (normative) Performance testing of steam heated tumble dryers . 48
G.1 General . 48
G.2 Types of steam heating – Steam heated tumble dryers . 48
G.3 Specification of steam properties . 48
G.3.1 Type of steam . 48
G.3.2 Steam generator . 48
G.4 Equipment and instrumentation . 48
G.4.1 Test equipment for measuring the characteristics of steam . 48
G.4.2 Instruments . 49
G.5 Installation . 49
G.5.1 General . 49
G.5.2 Installation of the measurement equipment for indirect steam heated
tumbler dryers.(Alternative 1) . 49
G.5.3 Installation of the measurement equipment for indirect steam heated
tumble dryers. (Alternative 2) . 51
G.6 Preparation for testing . 52
G.6.1 General . 52
G.6.2 Indirect heated tumble dryer installed according to Alternative 1 . 52
G.6.3 Indirect heated tumble dryer installed according to alternative 2 . 53
G.7 Tests for performance . 53
G.7.1 General . 53
G.7.2 Performance testing of indirect steam heated tumble dryer installed
according to alternative 1 . 53
G.7.3 Performance testing of indirect heated tumble dryers installed according
to Alternative 2 . 53
G.8 Assessment of performance . 54
G.8.1 General . 54
G.8.2 Evaluation of performance of indirect heated tumble dryer installed
according to alternative 1 . 54
G.8.3 Evaluation of performance of indirect heated tumbler dryers installed
according to alternative 2 . 55
G.8.4 Evaluation of total energy supplied to the tumbler dryer by steam . 55
G.9 Data to be reported . 56
Annex H (informative) Performance testing of gas heated tumble dryers . 57
H.1 General . 57
H.2 Installation, testing procedure and calculation of supplied gas energy . 57
Annex I (informative) Measurement of exhaust air volume . 58
I.1 Procedure . 58
I.2 Exhaust air volume . 58
Annex J (normative) Measurement of the textile drying temperature . 59
J.1 General . 59
J.2 Specification of the loggers . 59
J.3 Preparation of the loggers before measurement . 59
J.4 Number of loggers . 59

J.5 Measuring the temperature . 60
J.6 Presenting the result . 60
Bibliography . 61

Figure B.1 – Exhaust duct bend . 33
Figure B.2 – Exhaust duct Type 2 . 35
Figure C.1 . 39
Figure C.2 . 40
Figure G.1 – Schematic installation of the measurement equipment for steam heated
tumble dryers (Alternative 1) . 50
Figure G.2 – Schematic installation of the measurement equipment for steam heated
tumble dryers (Alternative 2) . 52

Table 1 – List of symbols . 11
Table 2 – Specification of instruments. 17
Table 3 – Number of items in the test load for various test load masses . 21
Table 4 – Specifications for initial moisture content in the test load . 23
Table 5 – Specification for final moisture content of the test load after drying in a
cotton dry programme . 24
Table B.1 – Equivalent tube length of a 90° bend . 33
Table B.2 – Pressure drop values for different diameters and flows for a 15 m long duct . 36
Table D.1 – Identification data . 41
Table D.2 – Test measurements . 42
Table D.3 – Test conditions and materials . 44
Table J.1 – Specification of temperature logger suitable for temperature measurement
for both washing and drying . 59
Table J.2 – Number of temperature loggers to be used during a textile drying
temperature measurement . 60

– 6 – IEC PAS 63124:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TUMBLE DRYERS FOR COMMERCIAL USE –
METHODS FOR MEASURING THE PERFORMANCE

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
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
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.
A PAS is an intermediate specification not fulfilling the requirements for a standard, but made
available to the public.
IEC PAS 63124 has been processed by subcommittee 59D: Performance of household and
similar electrical laundry appliances, of IEC technical committee 59: Performance of
household and similar electrical appliances.
The text of this PAS is based on the This PAS was approved for
following document: publication by the P-members of the
committee concerned as indicated in
the following document
Draft PAS Report on voting
59D/447/DPAS 59D/451/RVDPAS
Following publication of this PAS, which is a pre-standard publication, the technical committee
or subcommittee concerned may transform it into an International Standard.

This document is based on CLC/TS 50594:2015.
This PAS shall remain valid for an initial maximum period of 2 years starting from the
publication date. The validity may be extended for a single period up to a maximum of
2 years, at the end of which it shall be published as another type of normative document, or
shall be withdrawn.
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.
– 8 – IEC PAS 63124:2017 © IEC 2017
TUMBLE DRYERS FOR COMMERCIAL USE –
METHODS FOR MEASURING THE PERFORMANCE

1 Scope
This PAS is applicable to tumble dryers for commercial use of the automatic and non-
automatic type, incorporating an electric or steam heating device. It also includes tumble
dryers which use gas as a heating source with a reference to appropriate EN gas standards.
The object is to state and define the principal performance characteristics of tumble dryers
for commercial use of interest to users and to describe standard methods for measuring these
characteristics.
NOTE It does not apply to transfer tumble dryers or dryers with automatic loading and unloading.
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 12953-10, Shell boilers – Part 10: Requirements for feedwater and boiler water quality
EN 50570:2013, Household and similar electrical appliances – Safety – Particular
requirements for commercial electric tumble dryers
CLC/TS 50640:2015, Clothes washing machines for commercial use – Methods for measuring
the performance
EN 60456:2011, Clothes washing machines for household use – Methods for measuring the
performance (IEC 60456:2010, modified)
EN 60734, Household electrical appliances – Performance – Water for testing (IEC 60734)
EN 62053-21, Electricity metering equipment (a.c.) – Particular requirements – Part 21: Static
meters for active energy (classes 1 and 2) (IEC 62053-21)
ISO 80000-1:2009, Quantities and units – Part 1: General
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
tumble dryer
appliance in which textiles are dried by tumbling in a rotating drum, through which air is
passed
3.1.2
air vented tumble dryer
tumble dryer that draws in fresh air which is passed over the textiles and where the resulting
moist air is exhausted into the room or vented outside
3.1.3
condenser tumble dryer
tumble dryer which includes a device for removing moisture from the air used for the drying
process
3.1.4
automatic tumble dryer
tumble dryer which switches off the drying process when a certain moisture content of the
load is reached
Note 1 to entry: This may include systems that use conductivity or temperature sensing.
3.1.5
non-automatic tumble dryer
tumble dryer which does not switch off the drying process when a certain moisture content
of the load is reached, usually controlled by a timer, but may also be controlled manually
3.1.6
transfer tumble dryer
tumble dryer with automatic loading and unloading via conveyers or by other means
Note 1 to entry: The loading and unloading conveyers are often located on opposite sides of the drying basket.
3.1.7
test load
textile load used for testing
3.1.8
pre-treatment
processing of a new test load prior to its first use to avoid rapid changes of characteristics
during the tests
3.1.9
conditioning
bringing the test load into thermodynamic equilibrium with the defined ambient air conditions
of temperature and humidity
Note 1 to entry: The process of conditioning is not the same as ‘wetting’ which is described in 6.6.7.
3.1.10
test run
single performance assessment
3.1.11
test series
group of test runs on a tumble dryer which, collectively, are used to assess the performance
of that tumble dryer
3.1.12
operation
performance of a function that occurs during the tumble dryer drying process such as heating
up, drying, cooling, anti-creasing

– 10 – IEC PAS 63124:2017 © IEC 2017
3.1.13
programme
series of operations which are pre-defined within the tumble dryer and which are declared
by the manufacturer as suitable for drying certain types of textiles
3.1.14
end of the programme
moment in time when the tumble dryer indicates the programme is complete and the load is
accessible to the user
3.1.15
programme time
period of time from the initiation of the programme (excluding any user programmed delay)
until the end of the programme
3.1.16
cycle
complete drying process, as defined by the selected programme, consisting of a series of
operations including any operations that occur after the end of the programme
Note 1 to entry: Examples of operations that may occur after the completion of the programme are monitoring
and anti-creasing operations (where applicable).
3.1.17
cycle time
period of time from the initiation of the programme (excluding any user programmed delay)
until all activity ceases
Note 1 to entry: Activity is considered to have ceased when the power consumption reverts to a steady state
condition that persists indefinitely without user intervention. If there is no activity after the end of the programme,
the cycle time is equal to the programme time.
Note 2 to entry: Cycle time includes any activity that may occur for a limited period after the end of the
programme. Any cyclic event that occurs indefinitely is considered to be steady-state.
3.1.18
normalization
processing of a test load after a pre-determined number of cycles to bring the test load to a
normal state prior to testing
3.1.19
rated capacity
maximum mass in kilograms of dry textiles of a particular defined type, which the
manufacturer declares can be treated in a specific programme
3.1.20
test load mass
actual mass of the test load
3.1.21
conditioned test load mass
mass of the test load when conditioned to correct humidity and temperature defined in 5.2.3.2
3.1.22
nominal test load mass
mass of dry textiles of a particular type for which the performance of the tumble dryer will be
tested (rated capacity or part load)
Note 1 to entry: Target value toward which the conditioned test load mass will be adjusted.

[SOURCE: EN 61121:2013, 3.1.20, modified – The second part of the definition has been
turned into the present Note 1 to entry.]
3.1.23
moisture content
ratio of the difference between test load mass and the conditioned test load mass to the
conditioned test load mass expressed in percent
3.1.24
initial moisture content
moisture content of a test load prior to a test run
3.1.25
final moisture content
moisture content of a test load at the end of a test run
3.1.26
rated voltage
voltage assigned to the appliance by the manufacturer
3.2 List of symbols
The symbols are listed in Table 1.
Table 1 – List of symbols
Symbol Unit Definition
a
- constant part of the regression line
b - slope part of the regression line
C % arithmetical average of the condensation efficiency of all valid test runs
C condensation efficiency for test run j
%
j
d Kg/l density of water
E kWh arithmetical average of the corrected energy consumption of all valid test runs
E kg/min evaporation capacity
c
E kWh corrected total energy consumption for test run j
j
E kWh measured total energy consumption for test run j
mj
E kWh measured electric energy consumption for test run j
ej
E kWh measured steam energy consumption for test run j
sj
E kWh measured gas energy consumption for test run j
gj
E kWh/kg specific corrected energy consumption
s
F m /min volumetric flow rate
j test run number
-
L l Arithmetical average of the corrected water consumption of all valid test
runs
L l Corrected water consumption for test run j

j
L l Measured water consumption for test run j

mj
L l/kg Specific water consumption

s
n - number of test runs
p Pa static pressure
S - standard deviation of measured results

– 12 – IEC PAS 63124:2017 © IEC 2017
Symbol Unit Definition
S - standard deviation of the measured final moisture content for all valid test runs
b
T min arithmetical average of the corrected programme time of all valid test runs
T min/kg specific corrected programme time
s
T min corrected programme time for test run j
j
T min measured programme time for test run j
mj
V l clothes container volume
c
V m exhaust air volume
W rated capacity for the type of load tested
g
W g mass of the conditioned test load
W g mass of the test load after drying
f
W mass of the test load after drying for test run j
g
fj
W g mass of the test load after wetting
i
W g mass of water collected
w
W g mass of water collected during test run j
wj
W kg mass of the small sheet in a test load
S
W kg mass of the medium sheet in a test load
M
W kg mass of the large sheet in a test load
L
W kg desired masst of the test load
T
x - i-th term of parameter x
i
- mean of all terms of parameter x
x
i
X number of small sheets in a test load

S
X number of medium sheets in a test load
M
X number of large sheets in a test load
L
Y performance parameter (energy consumption or programme time)
-
μ % average measured final moisture content for a test load
μ % target final moisture content
f0
μ % measured final moisture content after test run j
fj
μ % measured initial moisture content for test run j
ij
μ % nominal initial moisture content
i0
4 Requirements
4.1 General
This PAS does not specify minimum performance requirements for tumble dryers. This PAS
does however set methods for the measurement of following performance parameters:
• electric energy consumption;
• steam energy consumption;
• gas energy consumption;
• water consumption;
• programme time;
• condensation efficiency;
• drying temperature of the textiles;
• volumetric flow rate of exhaust air.
Any claims of performance referring to this PAS for these parameters shall be measured in
accordance with the requirements of this PAS. Any claims of performance referring to this
document at other than rated capacity shall be qualified with load type and capacity used for
the test (refer to Clause 7 for details).
4.2 Rated capacity
The manufacturer or supplier shall declare the rated capacity at 0,5 kg intervals for each
relevant textile type up to a rated capacity of 10 kg. For capacities larger than 10 kg the
supplier may declare the rated capacity at 1 kg intervals. Relevant textile types are cotton
and synthetic/blends.
The rated capacity for any textile type shall not exceed the maximum mass of dry laundry, in
kilograms, to be used in the appliance in accordance with EN 50570:2013, 3.1.9.
If the rated capacity is not declared by the manufacturer, the rated capacity shall be
deduced from the clothes container volume (see 4.3) as described in Annex E.
Where the manufacturer gives a range of values for the rated capacity for a particular textile
type, the maximum value shall be used.
For different textiles the rated capacity of an appliance may be different.
4.3 Dimensions
Where a manufacturer declares dimensions, these shall be in accordance with the following
requirements, as applicable. The dimensions shall be given in mm and shall be rounded up to
the nearest higher millimetre.
• Height = vertical dimension measured from the lower edge (on the floor) to the upper edge
of the top, with the door/lid closed: if adjustable levelling feet are provided, they shall be
moved to determine maximum possible height.
• Max height = maximum vertical dimension measured from the lower edge (on the floor) to
a horizontal plane at the maximum height of the tumble dryer with the door/lid open: if
adjustable levelling feet are provided, they shall be moved up and down to determine
minimum and maximum possible heights.
• Width = horizontal dimension, between the sides, as measured between two parallel
vertical planes against the sides of the tumble dryer, including all projections.
• Depth = horizontal dimension as measured from a vertical rear plane against the tumble
dryer and the most prominent part of the front, knobs and handles not being taken into
account, with the door/lid closed, including all projections.
• Max depth = horizontal dimension as measured from a vertical rear plane against the
tumble dryer and the most prominent part of the front knobs and handles not being taken
into account, with the door/lid open (generally when at right angles to the machine front),
including all projections.
• Clothes container volume = the volume of the container in which textiles are placed, where
required, shall be determined in accordance with Annex E.
5 Test conditions, materials, equipment and instrumentation
5.1 General
The tolerances specified for parameters within this PAS, using the symbol ‘ ± ’, indicate the
allowable limits of variation from the specified parameter outside which the test or results

– 14 – IEC PAS 63124:2017 © IEC 2017
shall be invalid. The statement of tolerance does not permit the deliberate variation of these
specified parameters.
5.2 Ambient conditions
5.2.1 Electricity supply
The supply voltage at the power outlet to each tumble dryer shall be maintained at the rated
voltage ± 2 % throughout the test. If a voltage range is indicated, then the supply voltage
shall be the nominal voltage of the country in which the appliance is intended to be used.
The supply frequency to each tumble dryer shall be maintained at the rated frequency ± 1 %
throughout the test.
The measured voltage and frequency of the power supply used during testing shall be
reported.
Voltage stabilizers should be designed such that the normal operation of the tumble dryer
does not cause undue distortion of the voltage waveform.
5.2.2 Water supply
5.2.2.1 General
This section describes the specifications for water to be used for preparing test loads,
wetting test loads and for water used as cooling fluid.
In all cases the water supply shall meet the requirements given in 5.2.2.2. Water used for
normalizing test loads and wetting test loads shall meet the requirements of 5.2.2.2 and
5.2.2.3.
Water used for wetting test loads for testing conductivity controlled automatic tumble dryers
shall meet the requirements of 5.2.2.2, 5.2.2.3 and, 5.2.2.4.
The performance of a dryer may differ when water of different quality is used to wet the test
load.
5.2.2.2 Water temperature and pressure
The temperature of the cold water supply shall be (15 ± 2) °C.
The pressure of the water supply during water intake at the appliance water inlet shall be
maintained at (240 ± 50) kPa.
The measured water temperature and pressure shall be reported.
5.2.2.3 Water hardness
Standard soft water with a total hardness of (0,5 ± 0,2) mmol/l shall be used for all procedures
within this PAS. If available, naturally occurring water of the correct total hardness may be
used. Alternatively, water of the correct total hardness shall be prepared according to
EN 60734.
The total hardness of the water used shall be reported.

5.2.2.4 Water alkalinity and conductivity
When testing conductivity controlled automatic tumble dryers, the characteristics of the
water used for wetting the test load can have a large influence on the test results. The water
characteristics are defined in terms of hardness, alkalinity and conductivity.
For the purpose of testing automatic tumble dryers the water for wetting the test load shall
have the characteristics of water prepared according to Method B of EN 60734.
If water characteristics need to be adjusted, Method B or Method C3 of EN 60734 shall be
followed.
If applicable the pH, alkalinity and conductivity of the water used shall be reported.
5.2.3 Ambient temperature and humidity
5.2.3.1 Ambient t
...