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GB 40876-2021 English PDF (GB40876-2021)

GB 40876-2021 English PDF (GB40876-2021)

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GB 40876-2021: Minimum allowable values of energy efficiency and energy efficiency grades for commercial induction cookers

This document specifies the energy efficiency grades and technical requirements, test and calculation methods, and the implementation of standards for commercial induction cookers. This document applies to induction cookers with single or multiple heating units, where the rated power of a single heating unit shall not exceed 35 kW and the rated voltage shall not exceed 450 V.
GB 40876-2021
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 27.010
CCS F 01
Minimum allowable values of energy efficiency and
energy efficiency grades for commercial induction
cookers
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: NOVEMBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Energy efficiency grades ... 5
5 Technical requirements ... 5
6 Test and calculation methods ... 5
7 Implementation of the standard ... 7
Appendix A (Normative) Requirements for test pots ... 8
Appendix B (Normative) Test method of thermal efficiency ... 11
Minimum allowable values of energy efficiency and
energy efficiency grades for commercial induction
cookers
1 Scope
This document specifies the energy efficiency grades and technical
requirements, test and calculation methods, and the implementation of
standards for commercial induction cookers (hereinafter referred to as
"induction cookers").
This document applies to induction cookers with single or multiple heating units, where the rated power of a single heating unit shall not exceed 35 kW and the rated voltage shall not exceed 450 V.
This document does not apply to household induction cookers, induction
cookers intended to be used under special environmental conditions (such as corrosive environments or environments prone to explosions), outdoor
induction cookers, etc.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document.
GB 4706.52, Household and similar electrical appliances - Safety - Particular requirements for commercial electric cooking ranges ovens hobs and hob
elements
3 Terms and definitions
Terms and definitions determined by GB 4706.52, and the following ones are applicable to this document.
3.1
Appendix B
(Normative)
Test method of thermal efficiency
The test method of thermal efficiency is as follows:
a) Under the test conditions specified in 6.1, place the induction cooker at the laboratory ambient temperature for at least 2 h;
b) For the non-integrated flat stove, a standard pot in accordance with A.1 and a standard lid in accordance with A.2 can be used for testing. The
standard pot shall be a matching port of the smallest specification to cover the heating area; the mass of the pot m2, and the mass of the lid m3 shall be measured;
c) For the non-integrated concave stove, the manufacturer's standard pot and the standard lid of A.3 can be used for testing. The test pot shall be a matching pot of the smallest specification to cover the heating area; the mass of the pot m2, and the mass of the lid m3 shall be measured;
d) For the integrated stove, use the manufacturer's standard pot and the standard lid of A.3 for testing; the mass of the pot m2 and the mass of the lid m3 shall be measured;
e) Fill the pot with 70% of its volume of water; record the mass as m1; the water temperature is 15 ??C ??1 ??C;
f) Place the matching pot with water in the center of the product heating unit; cover it;
g) Put the temperature measuring probe into the center of the pot from the lid hole; when the measuring point is 10 mm away from the pot bottom,
read the reading t1 of the temperature measuring instrument;
h) Start the induction cooker and quickly adjust it to the maximum rated power;
i) When the temperature rise of the water is close to 75 K, turn off the induction cooker; record the consumed electric energy E; read the highest temperature reading t2 after 1 min; calculate the thermal efficiency
according to Formula (1);

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