Tumble dryers for commercial use - Methods for measuring the performance

This Technical Specification 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.

Elektrische Waschgeräte für den kommerziellen Einsatz - Prüfverfahren zur Bestimmung der Gebrauchseigenschaften

Sušilniki perila za komercialno uporabo - Metode za merjenje funkcionalnosti

General Information

Status
Withdrawn
Publication Date
23-Apr-2015
Current Stage
6060 - Document made available
Due Date
08-Jun-2005
Completion Date
08-Jun-2005

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SLOVENSKI STANDARD
SIST-TS CLC/TS 50594:2015
01-junij-2015
Sušilniki perila za komercialno uporabo - Metode za merjenje funkcionalnosti
Tumble dryers for commercial use - Methods for measuring the performance

Elektrische Waschgeräte für den kommerziellen Einsatz - Prüfverfahren zur Bestimmung

der Gebrauchseigenschaften
Ta slovenski standard je istoveten z: CLC/TS 50594:2015
ICS:
97.060 Aparati za nego perila Laundry appliances
SIST-TS CLC/TS 50594:2015 en

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

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SIST-TS CLC/TS 50594:2015
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SIST-TS CLC/TS 50594:2015
TECHNICAL SPECIFICATION CLC/TS 50594
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
April 2015
ICS 97.060
English Version
Tumble dryers for commercial use - Methods for measuring the
performance
Elektrische Waschgeräte für den kommerziellen Einsatz -
Prüfverfahren zur Bestimmung der
Gebrauchseigenschaften
This Technical Specification was approved by CENELEC on 2015-01-26.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly

at national level in an appropriate form. It is permissible to keep conflicting national standards in force.

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, 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: Avenue Marnix 17, B-1000 Brussels

© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. CLC/TS 50594:2015 E
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CLC/TS 50594:2015 – 2 –
Contents Page

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 ...................................................................................................... 9

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 .................................................................................................. 14

5.3.3 Detergent ................................................................................................. 14

5.4 Equipment ............................................................................................................ 14

5.4.1 Equipment for normalization ................................................................... 14

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 ................................................................................................. 16

6.1 General ................................................................................................................ 16

6.2 Test specifications from manufacturers ............................................................ 16

6.3 Installation of the tumble dryer .......................................................................... 16

6.4 Preparation of the tumble dryer for a test series ............................................... 17

6.5 Preparation of the tumble dryer for a test run ................................................... 17

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.................................. 18

6.6.3 Requirements regarding the age of test load items ............................... 18

6.6.4 Normalization of test load items ............................................................. 18

6.6.5 Conditioning of test load items ............................................................... 18

6.6.6 Test load composition ............................................................................. 19

6.6.7 Wetting ..................................................................................................... 21

7 Performance measurements – General requirements ................................................. 22

8 Tests for performance .................................................................................................. 23

8.1 General ................................................................................................................ 23

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8.2 Test procedure for performance tests ................................................................ 23

8.2.1 Test conditions, materials and preparation for testing ......................... 23

8.2.2 Programme ............................................................................................... 23

8.2.3 Test load .................................................................................................. 24

8.2.4 Test procedure ......................................................................................... 24

8.2.5 Validity of a test run ................................................................................ 24

8.2.6 Validity of a test series ............................................................................ 24

8.3 Measurements to determine water and energy consumption and

programme time .................................................................................................. 25

8.3.1 General ..................................................................................................... 25

8.3.2 Procedure................................................................................................. 25

8.4 Measurements to determine condensation efficiency ....................................... 25

8.4.1 General ..................................................................................................... 25

8.4.2 Procedure................................................................................................. 25

8.5 Measurements to determine exhaust air volume ............................................... 26

8.6 Performance measurement at maximum exhaust duct pressure ...................... 26

8.7 Measurement of the textile drying temperature ................................................. 26

9 Assessment of performance ........................................................................................ 26

9.1 General ................................................................................................................ 26

9.2 Final moisture content of the load...................................................................... 26

9.3 Total energy ......................................................................................................... 27

9.4 Corrected energy ................................................................................................. 27

9.5 Corrected water consumption ............................................................................ 28

9.6 Corrected programme time ................................................................................. 28

9.7 Condensation efficiency ..................................................................................... 29

9.8 Evaporation capacity........................................................................................... 30

9.9 Exhaust air volume .............................................................................................. 30

10 Data to be reported ....................................................................................................... 30

Annex A (normative) Reference list ................................................................................... 31

Annex B (normative) Exhaust ducts for tumble dryer testing ........................................... 32

Annex C (informative) Flow diagrams ................................................................................ 37

Annex D (normative) Test report – Data to be reported .................................................... 39

Annex E (normative) Procedure to determine test load size where rated capacity

is not declared .............................................................................................................. 43

Annex F (normative) Flexible initial moisture content method ......................................... 44

Annex G (normative) Performance testing of steam heated tumble dryers ..................... 46

Annex H (informative) Performance testing of gas heated tumble dryers ........................ 54

Annex I (informative) Measurement of exhaust air volume ............................................... 55

Annex J (normative) Measurement of the textile drying temperature .............................. 56

Bibliography ........................................................................................................................ 58

Figure B.1 — Exhaust duct bend ....................................................................................................... 32

Figure B.2 — Exhaust duct Type 2 .................................................................................................... 34

Figure C.1 ............................................................................................................................................. 37

Figure C.2 ............................................................................................................................................. 38

Figure G.1 — Schematic installation of the measurement equipment for steam heated

tumble dryers (Alternative 1)....................................................................................................... 48

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Figure G.2 — Schematic installation of the measurement equipment for steam heated

tumble dryers (Alternative 2)....................................................................................................... 50

Table 1 — List of symbols .................................................................................................... 9

Table 2 — Specification of instruments ............................................................................. 16

Table 3 — Number of items in the test load for various test load masses ....................... 19

Table 4 – Specifications for initial moisture content in the test load ............................... 22

Table 5 — Specification for final moisture content of the test load after drying in

a cotton dry programme ............................................................................................... 23

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 ....................................................................................................................... 35

Table D.1 — Identification data .......................................................................................... 39

Table D.2 — Test measurements ........................................................................................ 40

Table D.3 — Test conditions and materials ....................................................................... 42

Table J.1 — Specification of temperature logger suitable for temperature

measurement for both washing and drying ................................................................. 56

Table J.2 — Number of temperature loggers to be used during a textile drying

temperature measurement ........................................................................................... 57

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Foreword

This document (CLC/TS 50594:2015) has been prepared by CLC/TC 59X "Performance of household

and similar electrical appliances".

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] 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.

This document is a new Technical Specification, but it is based on portions from EN 61121:2013.

This Technical Specification is the main body of a forthcoming European Standard for measuring the

performance of non-household tumble dryers. The content of this Technical Specification will be

added with the Annex ZZ when the details regarding Ecodesign regulations are defined.

The procedures described in this Technical Specification are modified substantially compared to the

procedures described in EN 61121. Therefore, results of tests according to this Technical

Specification 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) a test procedure for measuring power consumption also for steam heated and gas heated tumble

dryers;
c) the introduction of a new type of base load;
d) the introduction of a new initial moisture level.

NOTE CLC/TS 50640:2015 is planned to be a European Standard for the energy measurement of gas

heated laundry equipment.
A bilingual version of this publication may be issued at a later date.
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CLC/TS 50594:2015 – 6 –
1 Scope

This Technical Specification 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, in whole or in part, are normatively referenced in this document and are

indispensable for its application. 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

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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
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
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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
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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
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
E kWh corrected total energy consumption for test run j
E kWh measured total energy consumption for test run j
E kWh measured electric energy consumption for test run j
E kWh measured steam energy consumption for test run j
E kWh measured gas energy consumption for test run j
E kWh/kg specific corrected energy consumption
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
L l Measured water consumption for test run j
L l/kg Specific water consumption
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

T min arithmetical average of the corrected programme time of all valid test runs

T min/kg specific corrected programme time
T min corrected programme time for test run j
T min measured programme time for test run j
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Symbol Unit Definition
V l clothes container volume
V m exhaust air volume
W g rated capacity for the type of load tested
W g mass of the conditioned test load
W g mass of the test load after drying
W g mass of the test load after drying for test run j
W g mass of the test load after wetting
W g mass of water collected
W g mass of water collected during test run j
W kg mass of the small sheet in a test load
W kg mass of the medium sheet in a test load
W kg mass of the large sheet in a test load
W kg desired masst of the test load
x - i-th term of parameter x
- mean of all terms of parameter x
X number of small sheets in a test load
X number of medium sheets in a test load
X number of large sheets in a test load
Y - performance parameter (energy consumption or programme time)
μ % average measured final moisture content for a test load
μ % target final moisture content
μ % measured final moisture content after test run j
μ % measured initial moisture content for test run j
μ % nominal initial moisture content
4 Requirements
4.1 General

This Technical Specification does not specify minimum performance requirements for tumble dryers.

This Technical Specification 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;
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• drying temperature of the textiles;
• volumetric flow rate of exhaust air.

Any claims of performance referring to this Technical Specification for these parameters shall be

measured in accordance with the requirements of this Technical Specification. 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.
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5 Test conditions, materials, equipment and instrumentation
5.1 General

The tolerances specified for parameters within this Technical Specification, using the symbol ‘ ± ’,

indicate the allowable limits
...

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