EN 50594:2018

SLOVENSKI STANDARD
01-oktober-2018
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Household and similar electric appliances - Methods for measuring the performance of
tumble dryers intended for commercial use
Elektrische Geräte für den Hausgebrauch und ähnliche Zwecke – Verfahren zur
Messung der Gebrauchseigenschaften für Wäschetrockner für den gewerblichen
Gebrauch
Ta slovenski standard je istoveten z: EN 50594:2018
ICS:
97.060 Aparati za nego perila Laundry appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50594
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2018
ICS 97.060 Supersedes CLC/TS 50594:2015
English Version
Household and similar electric appliances - Methods for
measuring the performance of tumble dryers intended for
commercial use
Appareils électrodomestiques et analogues - Méthodes de Elektrische Geräte für den Hausgebrauch und ähnliche
mesure de l'aptitude à la fonction pour les sèche-linge à Zwecke - Verfahren zur Messung der
tambour à usage commercial Gebrauchseigenschaften für Wäschetrockner für den
gewerblichen Gebrauch
This European Standard was approved by CENELEC on 2018-04-23. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50594:2018 E
Contents Page
European foreword . 5
1 Scope. 6
2 Normative references . 6
3 Terms, definitions and symbols . 6
3.1 Terms and definitions . 6
3.2 List of symbols . 8
4 Requirements . 10
4.1 General. 10
4.2 Rated capacity . 11
4.3 Dimensions . 11
5 Test conditions, materials, equipment and instrumentation. 12
5.1 General. 12
5.2 Ambient conditions . 12
5.2.1 Electricity supply . 12
5.2.2 Water supply . 12
5.2.3 Ambient temperature and humidity . 13
5.3 Test materials . 13
5.3.1 General. 13
5.3.2 Test load . 13
5.3.3 Detergent . 13
5.4 Equipment . 13
5.4.1 Equipment for normalization . 13
5.4.2 Equipment for conditioning the test load . 14
5.4.3 Equipment for wetting the test load prior to a test . 14
5.4.4 Equipment for measurement . 14
5.5 Instrumentation and accuracy . 15
6 Preparation for testing. 15
6.1 General. 15
6.2 Test specifications from manufacturers . 15
6.3 Installation of the tumble dryer . 16
6.4 Preparation of the tumble dryer for a test series . 16
6.5 Preparation of the tumble dryer for a test run . 16
6.5.1 General. 16
6.5.2 Preparation requirements for all heating alternatives except for heat pump equipped
tumble dryers . 16
6.5.3 Preparation requirements for heat pump equipped tumble dryers . 16
6.6 Preparation of test loads . 17
6.6.1 General. 17
6.6.2 Pre-treatment of new test load items prior to use . 17
6.6.3 Requirements regarding the age of test load items . 17
6.6.4 Normalization of test load items . 17
6.6.5 Conditioning of test load items . 18
6.6.6 Test load composition . 18
6.6.7 Wetting . 21
7 Performance measurements – General requirements . 21
8 Tests for performance . 22
8.1 General. 22
8.2 Test procedure for performance tests . 22
8.2.1 Test conditions, materials and preparation for testing . 22
8.2.2 Test programme . 22
8.2.3 Test load . 23
8.2.4 Test procedure . 23
8.2.5 Validity of a test run . 23
8.2.6 Validity of a test series . 23
8.3 Measurements to determine water and energy consumption and cycle time . 24
8.3.1 General. 24
8.3.2 Procedure . 24
8.4 Measurements to determine condensation efficiency . 24
8.4.1 General. 24
8.4.2 Procedure . 24
8.5 Measurements to determine exhaust air volume . 25
8.6 Performance measurement at maximum exhaust duct pressure . 25
8.7 Measurement of the textile drying temperature . 25
9 Assessment of performance . 25
9.1 General. 25
9.2 Final moisture content of the load . 25
9.3 Total energy . 26
9.4 Corrected energy . 26
9.5 Corrected water consumption . 27
9.6 Corrected cycle time . 27
9.7 Condensation efficiency . 28
9.8 Evaporation capacity . 28
9.9 Exhaust air volume . 29
10 Data to be reported . 29
Annex A (normative) Reference list . 30
Annex B (normative) Exhaust ducts for tumble dryer testing . 31
Annex C (informative) Flow diagrams . 35
Annex D (normative) Test report – Data to be reported . 36
Annex E (normative) Procedure to determine test load size where rated capacity is not
declared . 40
Annex F (normative) Flexible initial moisture content method . 41
Annex G (normative) Performance testing of steam heated tumble dryers . 43
Annex H (normative) Performance testing of gas heated tumble dryers . 50
Annex I (informative) Measurement of exhaust air volume . 53
Annex J (informative) Measurement of the textile drying temperature . 54
Annex K (normative) Test procedure for a performance test of a cotton dry programme
with full load at standard rating conditions . 56
Annex L (normative) Reporting of key parameters . 64
Bibliography . 65

European foreword
This document (EN 50594:2018) has been prepared by CLC/TC 59X “Performance of household and similar
electrical appliances”.
The following dates are fixed:
• latest date by which this document has (dop) 2019-04-23
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-04-23
standards conflicting with this document
have to be withdrawn
This document supersedes CLC/TS 50594:2015.
This document is based on portions of EN 61121:2013.
The procedures described in this European Standard are modified substantially compared to the procedures
described in EN 61121. Therefore, results of tests according to this European Standard cannot and are
bound not to be compared to results of similar procedures of EN 61121.
Significant technical differences from EN 61121 are:
a) test procedures for tumble dryers of any size on the market;
b) test procedure for measuring power consumption also for steam heated and gas heated tumble dryers;
c) the introduction of a new type of test load;
d) the introduction of a new initial moisture content level.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission and
the European Free Trade Association.
1 Scope
This European Standard is applicable to tumble dryers intended to be used by trained users e.g. in hotels,
hospitals, factories, in light industry and on farms. It covers tumble dryers declared for commercial use in
public areas and operated by lay persons e.g. in launderettes, apartment houses and communal laundry
rooms. This European Standard covers tumble dryers which use electricity, gas or steam as a heating
source.
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 tumble dryers only possible to operate 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 437:2003+A1:2009, Test gases — Test pressures — Appliance categories
CEN/TR 1749:2014, European scheme for the classification of gas appliances according to the method of
evacuation of the combustion products (types)
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
EN 50640:2018, Clothes washing machines for commercial use — Methods for measuring the performance
EN 60456:2016, 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.
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
3.1.1
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 conveyors 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
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 cycle
when the load is accessible to the user and next programme can be started
3.1.15
cycle
complete drying process until the load is accessible to the user, as defined by the selected programme,
consisting of a series of operations
3.1.16
cycle time
time from the initiation of the programme (excluding any user programmed delay) until the end of the cycle
3.1.17
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
3.1.18
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
3.1.19
test load mass
actual mass of the test load
3.1.20
conditioned test load mass
mass of the test load when conditioned to correct humidity and temperature defined in 5.2.3.2
3.1.21
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.
3.1.22
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
3.1.23
initial moisture content
moisture content of a test load prior to a test run
3.1.24
final moisture content
moisture content of a test load at the end of a test run
3.1.25
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
HS,n heating value referred to standard conditions
kWh/m
V 3
measured gas volume
m M
W kWh average corrected energy consumption
W
kWh corrected consumption for test run j
j
W
kWh measured consumption for test run j
mj
W
kWh corrected electric energy consumption for test run j
ej
W
kWh corrected steam energy consumption for test run j
sj
W
kWh corrected gas energy consumption for test run j
gj
W
kWh measured electric energy for test run j
mej
W
kWh measured steam energy for test run j
msj
W
kWh measured gas energy for test run j
mgj
Wcs kWh energy of the recovered condensate
W
kWh total gas energy consumption
gt
W
kWh/kg specific corrected energy consumption
s
F 3
volumetric flow rate
v m /min
F
- Gas factor according to H.6.1
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
M
kg mass of supplied steam to the tumble dryer during a test run
dst
n - number of test runs
p Pa static pressure
S - standard deviation of measured results
S
- standard deviation of the measured final moisture content for all valid test runs
b
T min arithmetical average of the corrected cycle time of all valid test runs
T
min/kg specific corrected cycle time
s
T
min corrected cycle time for test run j
j
Symbol Unit Definition
T
min measured cycle time for test run j
mj
T
°C the condensate temperature
c
T
°C the temperature recorded by the steam temperature sensor
cs
t
°C maximum drying temperature
max
t
°C maximum ambient temperature during a test run
amax
t
°C minimum ambient temperature during a test run
amin
t
°C average ambient temperature during a test run
amean
V
l clothes container volume
c
V exhaust air volume
m
M g rated capacity for the type of load tested
M
g mass of the conditioned test load
M
g mass of the test load after drying
f
M
mass of the test load after drying for test run j
g
fj
M
g mass of the test load after wetting
i
M kg mass of the test load used after wetting but before drying
ij
M
g mass of water collected
w
M
g mass of water collected during test run j
wj
M
kg mass of the small sheet in a test load
S
M
kg mass of the large sheet in a test load
L
M
kg desired mass 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 large sheets in a test load
L
Y - performance parameter (energy consumption or cycle time)
μ % average measured final moisture content for a test series
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 European Standard does not specify minimum performance requirements for tumble dryers. This
European Standard does however set methods for the measurement of following performance parameters:
• electric energy consumption;
• steam energy consumption;
• gas energy consumption;
• water consumption;
• cycle time;
• condensation efficiency;
• drying temperature of the textiles;
• volumetric flow rate of exhaust air.
Any claims of performance referring to this European Standard for these parameters shall be measured in
accordance with the requirements of this European Standard. 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
The rated capacity for any textile type shall not exceed the maximum mass of dry laundry, 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 mm.
• 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 European Standard, using the symbol ‘ ± ’, indicate the
allowable limits of variation from the specified parameter outside which the test or results 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 to the test tumble dryer shall be 230 V or 400 V as defined by the manufacturer’s
installation guide. If more than one option for installation is available and no clear indication for testing is
given, the supply voltage shall be 400 V. The supply voltages shall be maintained throughout the test
within ± 2 %. For tumble dryers with a drum volume equal or larger than 1000 l the voltage tolerance is
allowed to be ± 3 %.The supply voltage measured during the tests shall be recorded.
The electric supply cable shall not exceed 4 m of length unless a longer supply cable is delivered together
with the tumble dryer from the manufacturer. The plug (or the end of the cable furthest from the dryer) is the
reference point at which the supply voltage shall be maintained.
The supply frequency to each test tumble dryer shall be maintained at 50 Hz ± 1 % throughout the test.
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.
NOTE The performance of a tumble 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
European Standard. 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, pH 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, pH 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 for soft water (0,5 ± 0,2) mmol/l.
If water characteristics need to be adjusted, Method B or Method C3 of EN 60734 shall be followed.
If applicable the alkalinity, pH and conductivity of the water used shall be reported.
5.2.3 Ambient temperature and humidity
5.2.3.1 Ambient temperature and relative humidity for tumble dryer testing
The ambient temperature of the test room shall be (23 ± 2) °C at the start of the drying test. The ambient
temperature shall not rise more than 4 K during the test run. The ambient temperature during tumble dryer
testing shall be recorded. The maximum, minimum and average temperature during the test run shall be
reported. The temperature measurement location shall be in the vicinity of the air intake and the temperature
shall be rounded to the nearest 0,5 °C.
For dryers with a drum volume equal or larger than 1000 l the ambient temperature tolerance can be
increased to (23 °C + 6 °C / - 2 °C) at the start of the drying test. If the starting ambient temperature is above
the normal temperature range of (23 ± 2) °C a correction shall be made according to K.5.6.11.
The ambient relative humidity of the test room shall be maintained at (55 ± 10) % throughout the tumble
dryer test. The ambient relative humidity shall be measured in the vicinity of the tumble dryer being tested.
The maximum and minimum measured ambient relative humidity for tumble dryer testing shall be reported
rounded to the nearest whole percentage.
Care should be taken to ensure that the ambient temperature and relative humidity are not influenced by the
appliance itself or other appliances in the laboratory.
5.2.3.2 Ambient temperature and ambient relative humidity for conditioning of test load items
Where an ambient controlled room or chamber is used for conditioning the test load, the following
conditions shall be maintained:
• ambient temperature: (20 ± 2) °C;
• ambient relative humidity: (65 ± 5) %.
The measured ambient temperature and relative humidity for conditioning test load items shall be reported.
The ambient temperature shall be rounded to the nearest 0,5 °C, the ambient relative humidity shall be
rounded to the nearest whole percentage.
NOTE Requirements for conditioning the test load are specified in 6.6.5.2.
5.3 Test materials
5.3.1 General
This section sets out the specifications for test materials required for tumble dryer testing to this European
Standard, including test loads and detergent.
5.3.2 Test load
The test load shall consist of small and large sheets as specified in A.2.
5.3.3 Detergent
The specification for the IEC Standard Powder Detergent 2016 (IEC-P) base powder as defined in A.1.
Detergent dosage is specified in 6.6.4.2.
5.4 Equipment
5.4.1 Equipment for normalization
The specification for a washing machine which is used for the normalization of test loads is defined in A.5.
5.4.2 Equipment for conditioning the test load
This European Standard requires test load items to be treated in a controlled manner prior to their use in
performance tests in order to determine their mass under standardized ambient conditions. The alternative
methods of conditioning the test load items are:
• Leaving the test load items in a room or chamber with a controlled ambient temperature and humidity
(refer to 5.2.3.2) until their remaining moisture content is in equilibrium with the ambient conditions.
Refer to 6.6.5.2 for details.
• Treating the test load items in a clothes dryer of specified performance to ensure that the test load
items are in a “bone dry” state. Refer to 6.6.5.3 for details. A.3 sets out the method and the
specifications for a tumble dryer which is used for this method.
5.4.3 Equipment for wetting the test load prior to a test
Any washing machine may be used to wet the test load prior to a test, provided it has the following features:
• a rated capacity which is equal to or greater than the test load being wetted;
• at least one rinse operation with a duration of at least five minutes;
• the rinse shall consist of a volume of water in litres at least three times the mass of the test load in
kilograms;
• a spin drying operation capable of achieving the desired initial moisture content.
5.4.4 Equipment for measurement
This European Standard requires the measurement of a range of parameters during testing of a tumble
dryer. These parameters include the following:
• mass;
• electrical parameters (voltage, energy, power and frequency);
• steam energy (steam pressure, steam temperature, steam flow);
• gas energy (gas flow);
• temperature of water and air;
• water pressure;
• textile temperature during drying;
• relative humidity;
• total water hardness;
• conductivity of water (conductivity sensing tumble dryers only);
• alkalinity of water (conductivity sensing tumble dryers only);
• time.
The specifications of instruments used to take the measurements for some of these parameters are explicitly
defined in 5.5.
NOTE Several different instruments for the measurement of mass are likely to be required for tasks such as mass
of test load items and the whole test load and mass of detergent.
5.5 Instrumentation and accuracy
Instruments used for this European Standard shall comply with the specifications set out in Table 2.
Devices using viscosity to measure water volume shall be calibrated at the actual nominal
temperature ± 5 °C, and the nominal flow rate.
Table 2 — Specification of instruments
Parameter Unit Resolution Accuracy Additional requirements
Mass
Masses above 50kg g 50 g ±100 g -
Masses in the range between 10 kg and g 10 g ±20 g -
50 kg
Masses in the range between 2 kg and g 1 g ±5 g -
10 kg
Masses in the range between 100 g and 2 g 0,5 g ±1 g -
000 g
Masses in the range up to 100 g g 0,05 g ±0,1 g -
Temperature °C 0,1 °C ±0,5 K -
Ambient temperature °C - - See spec. in Annex J
Textile temperature °C 0,1 °C ±0,5 K -
Water temperature
Ambient humidity % (RH) 1 % (RH) ±3 % (RH) The specifications shall be met
over a temperature range of
15 °C to 30 °C
Water volume (water inlet) l 0,1 l ±2 % -
Water pressure kPa 10 kPa ±5 %
Time s 5 s ±1 % -
Energy kWh As specified in ±1 % Due to distortion of the voltage
EN 62053–21, and current wave forms caused
Electrical energy consumption kWh ±2 %
Class 1 by inductive devices such as
Steam energy consumption kWh ±2 %
instrument motor controls, specific
Gas energy consumption
definition requirements for energy meters
are necessary.
-
See Annex G.
-
See Annex H.
Hardness of water mmol/l As specified in EN 60734
Conductivity of water µS/cm As specified in EN 60734
Alkalinity of water - As specified in EN 60734
6 Preparation for testing
6.1 General
This section sets out the requirements for the preparation of a tumble dryer. It also specifies the
requirements for the preparation of test loads.
6.2 Test specifications from manufacturers
Specifications that are given specifically for use by test laboratories shall be ignored.
6.3 Installation of the tumble dryer
The measurements shall generally be carried out on a new tumble dryer which is installed and used in
accordance with the manufacturer’s instructions, except as required by this European Standard. Where there
is more than one option for installation, the option chosen for testing shall be documented in the test report.
Steam heated tumble dryers shall be installed according to instructions in Annex G. Gas heated tumble
dryers shall be installed according to instructions in Annex H.
Where the tumble dryer is intended for use without a duct (i.e. the tumble dryer is intended to be vented
into the room), the tumble dryer shall be tested as supplied without a duct.
Where the tumble dryer is intended for use with a duct the tumble dryer shall be tested with a duct as
specified in Annex B.
Where a manufacturer gives the option to use the tumble dryer both with and without a duct, the tumble
dryer shall be tested with a duct.
The test report shall clearly state which duct configuration as specified in Annex B, if any, is used in each
test.
Where a water inlet is supplied, it shall be connected to an appropriate laboratory water supply system for
testing (refer to 5.2.2).
If the manufacturer gives the option to use a condenser tumble dryer both with and without condensation
box, the tumble dryer shall be tested in accordance with the manufacturer’s instructions. If no instructions
are provided, then the tumble dryer shall be tested with the condensation box.
6.4 Preparation of the tumble dryer for a test series
Before a test series is commenced the tumble dryer shall be checked to confirm that it has no operating
defects that may affect the operation of the unit.
Before each test series the filters, heat exchangers and ducts intended to be serviced by the user shall be
cleaned according to the manufacturer’s instructions.
6.5 Preparation of the tumble dryer for a test run
6.5.1 General
The manufacturer’s specification for the frequency of cleaning of the heat exchanger and related filters shall
be followed. If no specification is given regarding frequency, then the heat exchanger and its related filters
shall not be cleaned between test runs within a test series. In this context, the manufacturer’s specification
for cleaning the heat exchanger and its related filters means the specification that is directed towards the
user.
6.5.2 Preparation requirements for all heating alternatives except for heat pump equipped tumble
dryers
A commercial tumble dryer will mostly be running in a more or less continuous operation and therefore the
preparation requirements for a tumble dryer will be as follows.
Prior to start of a test run one preparatory run shall be made in the tumble dryer with a load equal to the
nominal test load mass. The load shall be wetted to the limits set in Table 5. The load shall be dried to a
dry state. The time between the preparatory run and the test run shall be (15 ± 5) min. If next consecutive
test run can be started within (15 ± 5) min from the end of the previous test run no preparatory run is
needed.
6.5.3 Preparation requirements for heat pump equipped tumble dryers
Tumble dryers equipped with heat pumps will change their operating characteristics considerably
depending of if the heat pump system is cold (the start condition) or warm (in continuous operation). A
commercial tumble dryer will mostly be running in a more or less continuous operation and therefore the
preparation requirements for a tumble dryer equipped with a heat pump will be as follows.
Prior to start of a test run two preparatory runs shall be made in the tumble dryer with a load equal to the
nominal test load mass. The load shall be wetted to the limits set in Table 5. The load shall be dried to a
dry state. The time between the two preparatory runs shall be (15 ± 5) min and the time between the second
preparatory run and the test run shall also be (15 ± 5) min. If next consecutive test run can be started within
(15 ± 5) min from the end of the previous test run no preparatory runs are needed.
6.6 Preparation of test loads
6.6.1 General
Test loads intended for tumble dryer tests following this European Standard shall not be used for any other
purpose except for wash performance tests following the full procedures in EN 50640. Test loads that have
been used for any other purpose are n
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