GB 21456-2024 Minimum allowable values of the energy efficiency and energy efficiency grades for household and similar kitchen appliances
1 Scope
This document specifies energy efficiency grades and heating efficiency calculations, technical requirements and test methods for household and similar kitchen appliances.
This document is applicable to the following household and similar kitchen appliances with a rated voltage of not greater than AC 250V:
a) electric rice cookers heated by electric heating element or electromagnetic induction, with a rated power of not greater than 2,200W;
b) electric pressure cookers with automatic working pressure control function, heated by electric heating elements or electromagnetic induction, with a rated power of not greater than 2,200W, a rated capacity of not larger than 10L and a rated cooking pressure of 40kPa~140kPa (gauge pressure).
c) stew cookers and stew cups with a rated power of not greater than 2,200W;
d) electric kettle that can be used to pour water from the spout by holding the handle and tilting the kettle, which is used only for boiling and heating water to boiling point and has no automatic water filling function;
e) induction cookers with one or more heating unit(s), which has a rated power of 700W ~ 3,500W;
f) microwave ovens (including combination microwave ovens) with a maximum rated input power of 2,500W or below, utilizing electromagnetic energy in the ISM band at a frequency of 2,450MHz to heat items and food in the oven cavity by resistive electric heating elements.
Note: The ISM frequency band is a range of electromagnetic frequencies defined by the International Telecommunication Union (ITU) and adopted in CISPR11 standards prepared by the International Special Committee on Radio Interference (CISPR).
This document is not applicable to the following kitchen appliances:
——commercial induction cookers, power frequency induction cookers and concave induction cookers;
——commercial microwave ovens, industrial microwave ovens and microwave ovens with range hoods.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 4706.1 Household and similar electrical appliances - Safety - Part 1: General requirements
GB/T 4706.14 Safety of household and similar electrical appliances - Part 14: Particular requirements for grills, toasters and similar portable cooking appliances
GB/T 4706.19 Safety of household and similar electrical appliances - Part 19: Particular requirements for appliances for heating liquids
GB/T 4706.21 Safety of household and similar electrical appliances - Part 21: Particular requirements for microwave ovens, including combination microwave ovens
GB 4706.29 Household and similar electrical appliances - Safety - Particular requirements for portable induction cooker
GB/T 18800-2017 Household microwave oven - Methods for measuring performance
GB/T 22089 Performance requirements and measuring methods for electric kettles
GB/T 35758 Household electrical appliances - Measurement of standby power
QB/T 4408 Stew cooker and similar appliances
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB 4706.1, GB 4706.14, GB 4706.19, GB 4706.21, GB 4706.29, GB/T 18800-2017, GB/T 22089, GB/T 35758 and QB/T 4408 and the following apply.
3.1
heating efficiency
ratio of effective output energy to input energy of kitchen appliances
3.2
standby mode(s)
any kitchen appliance that provides one or more of the following user-oriented functions or protection functions and is continuous when the kitchen appliance is connected to the mains power:
a) other modes (including activation or deactivation of active mode) can be triggered by triggering remote switches (including remote control), internal sensors and timers;
b) continuous function: information or state display including clock;
c) continuous function: sensor-based function.
Notes: A timer is a continuous clock function (which may or may not be associated with a display) that provides regular scheduled tasks (e.g. switching) and that operates on a continuous basis.
[Source: GB/T 35758-2017, 3.6]
3.3
off mode(s)
any mode of kitchen appliance that is not in standby mode, network mode or active mode and is continuous when the kitchen appliance's power supply unit is connected to the mains supply The indicator that prompts the user that the product is in the off position is included in the category of off mode.
[Source: GB/T 35758-2017, 3.5]
3.4
network mode(s)
mode of kitchen appliance where the kitchen appliance is connected to a main power supply and at least one network function is activated (such as reactivation via network command or network integrity communication) but where the primary function is not activated
Note: Where a network function is not activated and/or not connected to a network, then this mode is not applicable. The network function may be triggered by a preset instruction set or a network request response. The meaning of "network" herein includes communication between two or more mutually independent power supply devices or kitchen appliances. A network does not include one or more controls which are dedicated to a single kitchen appliance. Network mode may include one or more standby functions.
[Source: GB/T 35758-2017, 3.7]
3.5
warm-keeping energy consumption
electricity consumption when the kitchen appliance enters the warm-keeping state
3.6
energy consumption for grill-function
electricity consumption per unit temperature rise of microwave oven in the grill-function state
3.7
minimum allowable values of energy efficiency
minimum allowable energy efficiency index value of kitchen appliances under the test conditions specified in the standard
4 Energy efficiency grade and heating efficiency calculation
4.1 Energy efficiency grades
4.1.1 Energy efficiency grades of electric rice cookers
The energy efficiency of microwave ovens is divided into 3 grades (see Table 1), in which Grade 1 is the highest. The heating efficiency, standby power (if applicable) and warm-keeping energy consumption (if applicable) for each grade of products shall meet the requirements of Table 1.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Energy efficiency grade and heating efficiency calculation
5 Technical requirements
6 Test methods
7 Implementation of this standard
Annex A (Normative) Test methods for the energy efficiency of electric rice cookers
Annex B (Normative) Test methods for the energy efficiency of electric pressure cookers
Annex C (Normative) Test methods for the energy efficiency of stew cookers and stew cups
Annex D (Normative) Test methods for the energy efficiency of electric kettles
Annex E (Normative) Test methods for the energy efficiency of induction cookers
Annex F (Normative) Test methods for energy efficiency of microwave oven
