Household electromagnetic cooker energy efficiency detection and calculation method

In recent years, relevant departments of the state have issued a number of laws and regulations and related documents, and formulated specific plans for the situation and development direction of energy conservation work. It is proposed to vigorously promote energy-saving product certification and energy efficiency label management system, and guide users and consumers to purchase energy-saving products.

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(1) Producer's name or abbreviation;
(2) Product specifications and models;
(3) Energy efficiency rating;
(4) Thermal efficiency (%);
(5) Standby power (W);
(6) The national standard number for energy efficiency.
 
(2) Energy efficiency testing items, definitions and standards:
1. The test method for thermal efficiency and standby power is based on the current valid version of GB 21456.
2. Induction cooktops for one or more heating units (including induction cooktop units in combination appliances), each heating unit rated at 700W to 2800W, not suitable for commercial induction cooktops, power frequency induction cooktops and recesses kitchen.
3. Household electromagnetic stove energy efficiency test items: thermal efficiency, standby power
4. Energy efficiency rating: The energy efficiency rating of the induction cooker is divided into 5 levels, of which the energy efficiency of the first level is the highest. The thermal efficiency value of each level should not be less than that specified in Table 1. The power value of the standby state should not exceed the requirements of Table 1.
Energy efficiency rating indicators:
1
90
2
88
3
86
4
84
5
82
Table 1
Energy efficiency limit value: The energy efficiency limit value of the heating unit with rated power less than or equal to 1200W is 5 in Table 1. The energy efficiency limit value of the heating unit with rated power greater than 1200W is 4 in Table 1. All heating units included in the induction cooker should be Meet the corresponding requirements.
Target energy efficiency limit value: After 4 years from the date of implementation of the standard, the energy efficiency limit value of the electromagnetic cooker is 2W in standby state and 86% in thermal efficiency.
Main equipment: Test the voltage of the power supply, total harmonic distortion ≤ 3%
Energy meter can measure energy consumption at a minimum level of 20mW•h
Thermometer for measuring temperature, resolution ≤0.2°C
Quality measurement resolution ≤ 5g
The accuracy of the timer is ±s/h.
The power meter is an active power meter with a resolution of 0.1W.
Test conditions: Ambient temperature: 20 °C ± 2 °C
Relative temperature: 45% to 85%
Atmospheric pressure: 86kPa～85%
The power supply voltage is: 220 (1 ± 1%) V, and the frequency is (50 ± 1) Hz.
(3) Energy efficiency testing project test methods and main equipment
Thermal efficiency test method:
Under the specified test conditions, refer to Appendix A of the standard to select the minimum specification standard pot that can cover the heating area (the diameter of the bottom of the standard pot is larger than the effective diameter of the coil), measure the mass m2 of the standard pot, and place the corresponding standard pot in the cold state. The center of the induction cooker heating unit, the pot is filled with water m1 of the quality specified in Table 2, the water temperature is 15 °C ± 1 °C, capped, the thermometer is placed into the center of the pot from the hole of the pot, and the mercury is partially immersed in the water 10 mm from the bottom of the pot Read the thermometer reading t1, start the induction cooker and quickly adjust to the maximum rated power. When the temperature rise of the thermometer is close to 75K, turn off the induction cooker, record the consumed electric energy E, and read the highest temperature reading t2 within 1min. The temperature rise Δt is effective in the range of (75±1)K, and the thermal efficiency of the electromagnetic stove is calculated according to the calculation method required by the thermal efficiency calculation method.
formula:
η=(c1m1+c2m2) xΔt x 100% / (3.6 x 106 x E)
η -- thermal efficiency, %
C1 - the specific heat capacity of water, 4.18, in kilojoules per kilogram Kelvin [kJ/kg•K]
M1 - the mass of water in kilograms (kg).
C2 -- The specific heat capacity of the pot body and the lid is 0.46, and the unit is kilojoule per kilogram Kelvin [kJ/kg•K]
M2 -- the total mass of the body and lid, in kilograms (kg).
E -- the amount of electrical energy consumed in kilowatt hours (kW•h).
Δt --- temperature rise, the unit is Kelvin (k), Δt=t2-t1.
Based on the electric energy E recorded in the initial test, the above test procedure was repeated twice, and the average value of the three thermal efficiencies was calculated as the thermal efficiency value of the product. When the device has a plurality of heating units, the tests are performed one by one according to the heating unit. Standard pot adds water quality:
B1
120
140
75
0.80
B2
180
200
95
2.00
B3
200
220
110
2.80
B4
280
280
105
4.50
Table 2
Standby power measurement: The sample to be tested is powered by the rated voltage, in the standby state with the highest power consumption; and when the power meter reading is stable (about 90min), the test is started; the time and power consumption of the measurement are recorded.
The average power is calculated by the formula:
P=E/t
In the formula: P-average power in watts (W), accurate to 0.1W;
E-measurement of electricity consumption in watt hours (W•h);
T-measure duration in hours (h);

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