Energy Label- Criteria

Electric Ovens:

Energy Efficiency Criteria and Labeling Method for Electric Ovens

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Energy Efficiency Criteria and Labeling Method for Electric Ovens
No. En-Tech 10205010121
Promulgated and in effect on June 26, 2013

I. Electric Ovens (“products”) applying for Energy Label Certification shall meet the following requirements on scope, energy efficiency test conditions and methods, and energy efficiency criteria:

1. Scope: Products shall be of single-phase AC power supply with voltage below 300V or recognized by the Bureau of Energy, MOEA..

2. Energy Efficiency Test Conditions and Methods:
(1) Usable Capacity Test
i. For products with cuboidal interior, their usable capacities, V (liter), can be calculated using the following formula.

where,
Height H (mm): the distance between the bottom of the upper heating element and the upper surface of the rack placed at the lowest position; for product with embedded heater, the height is the distance between the bottom of the upper heating element and the base of the oven cavity.
Width W (mm): the nearest distance between rack supports
Depth D (mm): distance between the rear wall of the oven cavity and the inner surface of the closed door.

ii. For products without cuboidal interior, the usable capacity shall be calculated according to the oven’s actual geometric volume, where the definition of height H (mm) is the same as the one stated in (i).

iii. The measured usable capacity shall be greater than 95% of the rated usable capacity.

(2) 130℃ Temperature-Rise Electricity Consumption Test of the Test Block
i. Test Conditions
a. The ambient temperature shall be at 25±1℃, the wind speed during the test shall be less than 0.5m/s. The surfaces of the oven to be tested shall keep a distance of over 300 mm from surrounding walls of the test chamber. Meanwhile, if the difference between ground temperature and ambient temperature is over 2℃, the oven shall be placed on a flat wooden surface which shall be over 100 mm above the ground.
b. Test voltage shall be 110±V2% or 220V±1%.
c. Before the test, the oven shall be let still for at least 12 hours in the test environment described above.

ii. Accuracy of Test Equipments
a. Glass thermometer, thermocouple or resistance thermometer can be used to measure ambient temperature with an accuracy of ±0.5℃.
b. The accuracy of the thermocouple/resistance thermometer used to measure the electric oven shall be ±2℃.
c. The accuracy of the thermocouple used to measure the test block shall be ±1℃.
d. The measurement of electricity consumption shall be done by watt-hour meter with precision of 1Wh. The accuracy of watt-hour measurement shall be within ±1.5% of measured value; the accuracy of voltage measurement shall be within ±0.5% of the measured value.

iii. Test Block: The test block shall be made of 6061 aluminum alloy with purity over 96%. The specific heat capacity shall be 963J/kg‧℃ between 0℃ and 20℃, and the flatness of the bottom of the block shall be within 0.051mm. The test block shall get anodic treatment in order to have a layer of matte black hard coating which shall be at least 0.025mm in thickness, or have the same heat absorption rate. The configuration and specification of the test block are showed as Figure 1 and Table 1 respectively.

　　　　　　　　　　　Table 1　Test Block Specification

Test Block Specification	Usable Capacity under 12 liters	Usable Capacity above 12 liters
Diameter (mm)	110±1.3	158±1.3
Height (mm)^１	45	71
Weight (kg)²	1.18±0.05	3.85±0.05
Surface Roughness (μm)³ (root mean square value, rms)	0.8	0.8

Notes
1.Height is adjusted according the weight of the test block.
2.The values includes the weight of supporting screws.
3.The surface roughness is expressed in the root mean square (rms) value

a.The initial temperature of the test block shall be within ±2℃ of the ambient temperature.
b. The temperature of the test block shall be measured by the thermocouple, and recorded by appropriate instruments.
c. The junction of the thermocouple shall be placed at the bottom of the central hole of the test block, and in good thermal contact with the block. If water is used to cool the test block, the central hole shall be sealed to keep the hole dry.

iv. Test Procedure:
a. Place the thermocouple at the center of the usable capacity of the electric oven, and measure the temperature of the empty oven.
b. To calibrate the oven temperature, set the thermostat of the oven at the temperature which is 180℃±3℃ higher than the ambient temperature. Remove the thermocouple once the temperature is set.

c. Place the test block (without handle) on the rack (keep only one rack in the oven to support the test block), and keep the block center within 10mm of the geometric center of the usable capacity of the oven.

d. Test the electric oven at the maximum power. If the oven has steaming function, turn it off. For convection ovens, the fans shall be turn on, and for models equipped with multiple heaters, all heaters shall be turn on for the test. If all heaters cannot work at the same time, turn on the maximum number of heaters allowed at the convection mode for the test.

e. If the oven is equipped with on-off type thermostat(s), the electricity consumption Ec of the test block undergoing 130℃ temperature rise test shall be calculated by the formula shown below. The measured value shall be rounded to three decimal places. The notation for related test data is shown as Figure 2.

　
　　　　　　　
Where,
Ｔｃ(℃)＝Initial Temperature of the Test Block(℃)＋130℃；
Ｅ_ＡＢ＝(Ｅ_Ａ＋Ｅ_Ｂ)／2；
Ｔ_ＡＢ(℃)＝(Ｔ_Ａ＋Ｔ_Ｂ)／2；
Ｅ_Ａ：The electricity consumption of the oven as the thermostat turns off the heater before the block temperature reaches Tc
Ｔ_Ａ：The temperature of the test block as the thermostat turns off the heater before the temperature of the test block reaches Tc
Ｅ_Ｂ：The electricity consumption of the oven as the thermostat turns on the heater after the block temperature reaches T_A
Ｔ_Ｂ：The temperature of the test block as the thermostat turns on the heater after the temperature of the test block reaches T_A
Ｔ_ＤＥ(℃)＝(Ｔ_Ｄ＋Ｔ_Ｅ)／2；
Ｅ_ＤＥ＝(Ｅ_Ｄ＋Ｅ_Ｅ)／2；
Ｅ_Ｄ：The electricity consumption of the oven as the thermostat turns off the heater after the block temperature reaches T_B
Ｔ_Ｄ：The temperature of the test block as the thermostat turns off the heater after the block temperature reaches T_B
Ｅ_Ｅ：The electricity consumption of the oven as the thermostat turns on the heater after the block temperature reaches T_D
Ｔ_Ｅ：The temperature of the test block as the thermostat turns on the heater after the block temperature reaches T_D
f. If the oven is equipped with non on-off type thermostat(s), the electricity consumption Ec of the test block undergoing 130℃ temperature rise test shall be measured directly.

3. Electric Oven Energy Consumption Criteria: The 130℃ temperature rise test of the test block shall be done twice, and the difference between two measured electricity consumptions Ec1 and Ec2 shall be less than 5% of their average Ec. The value of average Ec for an electric oven applying for Energy Label Certification shall not be higher than the criteria shown below.
　　　　

Usable Capacity V (L)	Energy Consumption Criteria E (kWh)
2.0 ≦ V < 12	E = 0.0172V + 0.097
12.0 ≦ V	E = 0.0042V + 0.550

II. Notes on product labeling

1. The name and address of the label user shall be clearly displayed on the product or product packaging.

2. If the label user is an agent, the name and addresse of the manufacturer shall also be displayed on the product or product packaging.

3. The product catalog shall display usable capacity (L) and energy consumption (kWh).

4. The value of measured usable capacity shall be rounded to one decimal place; the value of measured energy consumption shall be rounded to three decimal places.

Lately update:2014/01/20 16:43:00