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GB/T 15911-2021 (GB/T15911-2021)

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GB/T 15911-2021: PDF in English (GBT 15911-2021)
GB/T 15911-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.010
F 01
Replacing GB/T 15911-1995
Monitoring and Testing Method for
Energy Saving of Industrial Electroheat Devices
ISSUED ON: APRIL 30, 2021
IMPLEMENTED ON: NOVEMBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 Monitoring Method for Energy Saving ... 6
5 Calculation of Monitoring for Energy Saving ... 7
6 Qualified Indicators for Monitoring of Energy-Saving ... 9
7 Evaluation for Monitoring Results of Energy-Saving ... 10
Appendix A (Informative) Monitoring Report Format for Industrial Electroheat
Device ... 12
Monitoring and Testing Method for Energy Saving of
Industrial Electroheat Devices
1 Scope
This Standard specifies the monitoring content, monitoring methods and qualified
indicators of the energy utilization status of industrial electroheat device.
This Standard is applicable to the energy-saving monitoring of industrial electric baking
furnaces (boxes), electric drying furnaces (kilns, chambers, boxes) and microwave-
type electroheat device with rated power greater than or equal to 8kW and rated
operating temperature less than or equal to 1500°C.
This Standard is not applicable to the energy-saving monitoring of metal smelting,
casting, heat treatment and other industries and mechanical forming processing
systems and vacuum electroheat device.
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 document.
GB/T 8222 The Principles for Electricity Balance of Equipment
GB/T 10066.1-2019 Test Methods for Electroheating and Electromagnetic
Processing Installations - Part 1: General
GB/T 10066.4-2004 Test Methods for Electroheat Installations - Part 4: Indirect
Resistances Furnaces
GB/T 15316 General Principles for Monitoring and Testing of Energy Saving
GB 17167 General Principle for Equipping and Managing of the Measuring
Instrument of Energy in Organization of Energy Using
GB/T 30839.4 Energy Consumption Grading for Industrial Electroheat
Installations -Part 4: Indirect Resistance Furnaces
conditions.
4.3.5 Monitoring time
Electroheat device for continuous production shall start monitoring when the thermal
conditions reach normal working conditions; and the monitoring time shall be no less
than 3h; the monitoring time of electroheat device for intermittent production shall be
no less than 3 production cycles.
4.4 Determination of temperature-rise time
4.4.1 The determination of temperature-rise time shall comply with the relevant
provisions of GB/T 10066.4-2004.
4.4.2 The electroheat device for continuous production (such as chains type, and
tunnel type, etc.) may be exempted from the determination of temperature-rise time.
4.5 Determination of surface temperature-rise
4.5.1 The temperature measurement points on the outer surface of the electroheat
device shall be separately on the outside of the furnace door, any optional 3~5 points
on the insulation shell (side wall and top cover); but they shall not be located 120mm
away from the furnace mouth (product entrance, heating element and thermocouple
lead-out hole, vent hole, etc.) and the fastener penetrating the inner lining.
4.5.2 The measurement of ambient temperature shall comply with the provisions of 5.8
in GB/T 10066.1-2019.
4.5.3 The measurement of surface temperature-rise shall comply with the provisions
of 6.17 in GB/T 10066.4-2004.
4.6 Determination of ratio of no-load power loss to rated power
The measurement of ratio of no-load power loss to rated power, and the rated power
shall be carried out respectively according to 6.11 and 6.8 of GB/T 10066.4-2004.
5 Calculation of Monitoring for Energy Saving
5.1 Calculation of electric energy utilization
The electric energy utilization rate shall be calculated according to Formula (1):
Where:
η – electric energy utilization rate;
WG - supply of electric energy, in kW·h;
WY - Effective electric energy, in kW·h.
The effective electric energy shall be calculated according to Formula (2):
Where:
m1 - the mass of the product before processing, in kg;
m2 - the mass of the product after processing, in kg;
t1 - the temperature of the product before processing, in °C;
t2 - the maximum working temperature of product heating, in °C;
c2 - the average specific heat capacity of the product at t2 - t1, in [kJ/(kg·°C)];
c1 - the average specific heat capacity of the volatile (evaporated) matter in the product
at t1 - t2, in [kJ/(kg·°C)];
r - the latent heat of the volatile (evaporated) matter in the product during the phase
change, in kJ/kg;
c1, c2, r — constants, available by checking related manuals.
5.2 Calculation for ratio of no-load power loss to rated power
The ratio of no-load power loss to rated power shall be calculated according to Formula
(3):
Where:
R – ratio of no-load power loss to rated power;
P0 – no-load power loss, in kW;
Pn – rated power, in kW.
......
 
(Above excerpt was released on 2021-06-30, modified on 2021-06-30, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT15911-2021