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GB 19761-2020 PDF in English


GB 19761-2020 (GB19761-2020) PDF English
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GB 19761-2020English145 Add to Cart 0-9 seconds. Auto-delivery. Minimum allowable values of energy efficiency and energy efficiency grades for fan Valid
GB 19761-2009English70 Add to Cart 0-9 seconds. Auto-delivery. Minimum allowable values of energy efficiency and energy efficiency grades for fan Obsolete
GB 19761-2005English359 Add to Cart 3 days The minimum allowable values of energy efficiency and evaluating values of energy conservation for fan Obsolete
Standards related to (historical): GB 19761-2020
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GB 19761-2020: PDF in English

GB 19761-2020 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 27.010 F 01 Replacing GB 19761-2009 Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Fan ISSUED ON: MAY 29, 2020 IMPLEMENTED ON: JUNE 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 Energy Efficiency Grade ... 6 5 Technical Requirements ... 9 6 Test Methods ... 13 Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Fan 1 Scope This Standard specifies the energy efficiency grade, minimum allowable values of energy efficiency, test methods and technical requirements of the fan. This Standard is applicable to general-purpose centrifugal fans, general-purpose axial flow fans, centrifugal induced draft fans for industrial boilers, centrifugal fans for boiler of power station, axial flow fans for power station, centrifugal fans for HVAC, and forward multi-blade centrifugal Fan. This Standard is not applicable to duct fans for air conditioning, box fans, unhoused centrifugal fan, and fans with other uses and special structure. 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) are applicable to this document. GB/T 1236 Industrial Fan - Performance Testing Using Standardized Airways GB/T 3235 Basic Types Sizes Parameters and Characteristics of Fans GB/T 10178 Industrial Fans-Performance Testing in Situ JB/T 2977 Technical Terms for Industry Fans, Turbo-Blowers and Compressors JB/T 4357 Centrifugal ID-Fan for Industry Boiler JB/T 4358 Centrifugal Fan for Boiler of Power Station JB/T 4362 Power Station Axial Fans JB/T 7221 Centrifugal Fan for Heating Ventilation and Air Conditioner JB/T 9068 Forward Curved Centrifugal Fan JB/T 10562 Technical Specification for General Purposes Axial Fans JB/T 10563 Technical Specification for General Purposes Centrifugal Fans 3 Terms and Definitions For the purpose of this document, the terms and definitions given in GB/T 1236, GB/T 3235, JB/T 2977 and the following apply. 3.1 Minimum allowable values of energy efficiency for fan Under the test conditions specified in the standard, the minimum guaranteed value of the fan's efficiency is allowed. 3.2 Plant Device composed of driving machine and fan. 4 Energy Efficiency Grade The energy efficiency grade of the fan is divided into three grades, of which the energy efficiency of Grade-1 is the highest, and the energy efficiency of Grade-3 is the lowest. The regulations are as follows: a) Centrifugal fan 1) The maximum fan efficiency ηr in the stable working area shall be no lower than the provisions specified in Tables 1 and 2; 2) The maximum fan efficiency of ordinary motor direct drive type (Type-A transmission) centrifugal fan in the stable working area shall be no lower than the provisions specified in Tables 1 and 2; 3) For the efficiency ηr of the double suction centrifugal fan in the stable working area, the Grades 1 and 2 shall decrease by 1 percentage point according to the provisions specified in Tables 1 and 2; while the Grade 3 shall decrease by 3 percentage points; 4) For the efficiency ηr of centrifugal fans for HVAC in the stable working area, Grades 1 and 2 shall decrease by 1 percentage point according to the provisions specified in Tables 1 and 2; while the Grade 3 shall decrease by 3 percentage points; 5) When the inlet has an air inlet box, the efficiency ηr at each grade in the stable 2) The ordinary motor direct drive (Type-A transmission) centrifugal fan in the stable working area shall have a maximum fan efficiency no lower than the provisions of Grade-3 in Tables 1 and 2. 3) The efficiency ηr of the double-suction centrifugal fan in the stable working area shall decrease by 3 percentage points in accordance with the provisions of Grade-3 in Tables 1 and 2. 4) The efficiency ηr of the centrifugal fan for HVAC in the stable working area shall decrease by 3 percentage points according to the provisions of Tables 1 Table 2. 5) When the inlet has an air inlet box, the efficiency ηr at each grade in the stable working area shall decrease by 4 percentage points in accordance with the provisions of Grade-3 in Tables 1 and 2. 6) For forward multi-blade centrifugal fans with external rotor motors (except single-phase and three-phase multi-speed type, three-phase six-pole and above) direct drive type, the maximum plant efficiency shall be no lower than the provisions of Grade-3 in Table 4. b) Minimum allowable values of energy efficiency for axial flow fan 1) The maximum fan efficiency in the stable working area shall be no lower than the provisions of Grade-3 in Table 3; 2) The maximum fan efficiency of the axial flow fan using the direct drive type (Type-A transmission) of ordinary motor in the stable working area shall be no lower than the provisions of Grade-3 in Table 3; 3) When the inlet has air inlet box, it shall decrease by 3 percentage points according to the provisions of Grade-3 in Table 3; 4) When the outlet has a diffusion tube, the efficiency value shall be no lower than the provisions of 0.55≤γ< 0.75, machine No. ≥No10 of Grade-3 in Table 3; and when the fan outlet has no diffusion tube, the efficiency value shall increase by 2 percentage point compared with Grade-3 in Table 3; 5) For an axial flow fan with adjustable moving blades (complete the synchronous adjustment of the moving blade angle during operation), under the condition that the inlet has no air inlet box, the outlet has no diffusion tube, the efficiency value shall be no less than 82%; 6) The reversible axial flow fan, the efficiency value shall decrease by 8 percentage points according to the provisions of Grade-3 in Table 3. ......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.