GB/T 23108-2021 English PDF (GBT23108-2021)

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GB/T 23108-2021: Methods for measuring performance for household and similar electric heating pads
GB/T 23108-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.100.10
CCS Y 63
Replace GB/T 23108-2008
Methods for measuring performance for household
and similar electric heating pads
(IEC 61255:2014, Household electric heating pads –
Methods for measuring performance, MOD)
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 1, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Classification of electric heating pads ... 7
5 Test items ... 8
6 General conditions of the test ... 9
7 Dimensions, mass, and the textile’s composition ... 10
8 Temperature uniformity ... 10
9 Heating time and energy consumption ... 11
10 Cyclic changes ... 12
11 Washing effect ... 12
References ... 14
Methods for measuring performance for household
and similar electric heating pads
1 Scope
This document specifies the main performance characteristics and test
methods of electric heating pads for household and similar purposes.
This document applies to electric heating pads for household and similar
purposes.
This document does not specify performance characteristic values.
Note: This document does not involve the safety requirements covered by GB 4706.8.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) is applicable to this standard.
GB 4706.8-2008 Household and similar electrical appliances - Safety -
Particular requirements for blankets, pads and similar flexible heating
appliances [IEC 60335-2-17:2006(Ed 2.1), IDT]
GB/T 10807 Flexible cellular polymeric materials - Determination of hardness
(indentation technique) (GB/T 10807-2006, ISO 2439:1997, IDT)
GB/T 35758-2017 Household electrical appliances -- Measurement of
standby power (IEC 62301:2011, IDT)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Heating pad
Appliances for local heating to the human body; it has a flexible part with a
heated area not exceeding 0.3 m2 on each side.
Electric heating pads are classified according to the types of power source:
- Electric heating pads that are connected to the electric network source
directly;
- Extra-low voltage electric heating pads.
Note: The rated voltage of the extra-low voltage heating pad does not exceed 24V.
4.4 Application methods
Electric heating pads are classified according to their application methods:
- Dry-using heating pads;
- Wet-using heating pads, including cosmetic heating pads.
4.5 Washing methods
Electric heating pads are classified according to the washing methods:
- Hand wash;
- Machine wash;
- Not washable.
4.6 Duration of use
Electric heating pads are classified according to the duration of use:
- Electric heating pads with timing function;
- Electric heating pads that can be used continuously.
5 Test items
The performance of the heating pad is determined by the following test items.
- Dimensions, mass, and the textile’s composition (see Chapter 7);
- Temperature uniformity (see Chapter 8);
- Heating time and energy consumption (see Chapter 9);
- Cyclic changes (see Chapter 10);
- Washing effect (see Chapter 11).
6 General conditions of the test
Unless otherwise specified, the test shall be carried out under the following
conditions:
a) Laboratory
The test shall be carried out in a room with no forced convection air and an
ambient temperature of (20±5) °C.
b) Supply voltage
The supply voltage shall be within ±1% of the rated voltage. If the rated voltage
range of the heating pad is calibrated, the test report shall indicate the voltage
used in the test.
Note: If the test result at the rated voltage of the heating pad is possible to be mistaken for the
result at the voltage of the supply system, then appliances may also be tested at the voltage
corresponding to the rated voltage of the system.
c) Placement of heating pads
Any removable covers shall be installed; the flexible part shall be placed
between thermal insulation materials which shall exceed the edge of the heated
area by at least 100 mm.
Thermal insulation materials shall be made of open-cell polyether:
- Hole count: /cm;
- Specified mass: ;
- Hardness: 120 N~170 N when the indentation measured according to GB/T
10807 reaches 40%.
Fully support the thermal insulation materials with a piece of 20 mm thick
plywood, at least 300 mm from the ground.
The thickness of the thermal insulation materials under the electric heating pad
is about 72 mm, and the thickness of the thermal insulation materials covering
the electric heating pad is about 36 mm. Thermal insulation materials shall meet
the requirements of Appendix AA of GB 4706.8-2008.
trace and can cover the maximum number of heating elements. The number of
test points shall meet the requirement that the center-to-center distance
between adjacent test points is not more than 200 mm. Measure the
temperature at 3 locations on the use surface at least.
Place the electric heating pad controller in the position with the maximum
temperature and energize it; measure the temperature when a steady state is
established or at the end of a complete working cycle.
Measure the temperature at each point, calculate the average value, and then
subtract the room temperature to obtain the temperature rise value. The range
of temperature rise is determined by the difference between the maximum
temperature rise and the minimum temperature rise.
Note: If there is more than one heated area, calculate each heated area separately.
The consistency is calculated by dividing the number of test points of the heated
area on which the average temperature rise is within ±2 K by the total number
of test points; the result is expressed as a percentage.
Temperature uniformity is expressed in terms of temperature rise range and
consistency. The temperature rise range is expressed in K and accurate to 1 K.
Consistency is expressed as a percentage and accurate to 1%.
9 Heating time and energy consumption
9.1 Heating time
Under the following test conditions, test the heating pad to obtain the heating
time required for the temperature rise reaching 20 K.
Before testing, keep the electric heating pad at an ambient temperature of (20
± 2) °C for at least 24 hours.
Use a thermocouple to measure the temperature rise; connect the
thermocouple to the center of a copper sheet measuring 65 mm x 65 mm x 0.5
mm, and place the copper sheet in the center of the heated area.
Place the electric heating pad controller in the highest temperature position and
energize it; record the required time for the temperature rise reaching 20 K.
The heating time is expressed in minutes and accurate to 1 min.
The heating pad shall be able to record the heating time and accurate to 1 min.
9.2 Energy consumption
Determine the energy consumption of both the heating time and the working
cycle.
Place the electric heating pad controller in the highest temperature position and
energize it; then, measure the energy consumption.
The energy consumption of the heating time is expr...