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GB/T 44844-2024: Industrial fans - Tolerances, methods of conversion and technical data presentation
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GB/T 44844-2024: Industrial fans - Tolerances, methods of conversion and technical data presentation

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ICS 23.120 CCSJ72 National Standard of the People's Republic of China Industrial ventilator tolerances, conversions and technical parameters Representation method data presentation (ISO 13348.2007, IDT) Released on October 26, 2024 Implementation on May 1, 2025 State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 Symbols and Units 5 5 Performance tolerances for specially designed ventilators and series-produced non-certified ventilators 7 5.1 Information to be provided by the purchaser 7 5.2 Information Suppliers Need to Provide 8 5.3 Tolerance 9 5.4 Purchase Agreement10 5.5 Contractually agreed testing 10 6 Performance tolerances for series-produced ventilators with certified rating procedures 19 6.1 General Principles 19 6.2 Fan performance conversion rules 19 6.3 Check test 19 6.4 Aerodynamic performance tolerances 19 6.5 Noise Tolerance 23 7 Conversion Method 23 7.1 Aerodynamic performance test data conversion 23 7.2 Sound Power Test Data Conversion 29 8 Technical data representation method 34 8.1 General Principles 34 8.2 Basic Information 34 8.3 Fan performance chart 34 8.4 Other Information 36 Appendix A (Normative) Document 39 Appendix B (Normative) Marking 40 Appendix C (Informative) Relationship between system resistance and flow rate 41 Reference 43 Figure 1 Deviation limits (tolerance range) of agreed operating parameters according to Table 1 12 Figure 2 Example of tolerance levels for adjustable ventilators 13 Figure 3 Example of specified tolerance levels for non-adjustable ventilators14 Figure 4 Comparison of measured values from performance tests with agreed operating points 17 Figure 5 Comparison of the range of measured values for the performance test of the specified parameters (efficiency and fan pressure) with the agreed operating points 18 Figure 6 Flow tolerance curve 21 Figure 7 Tolerances applicable to the full performance range of the fan 21 Figure 8 Measured dimensionless performance curve of fan 25 Figure 9 Dimensionless performance superposition system characteristic curve 26 Figure 10 Interpolation under constant system conditions 27 Figure 11 Interpolation showing gradient changes and necessary additional test points under constant system conditions 27 Figure 12 Interpolation shows gradient changes under constant system conditions and necessary additional test points Figure 28 Figure 13 Relationship between Lg and χ at the mixed flow fan inlet, φ=0.45 30 Figure 14 Relationship between Lg and χ at the outlet of the mixed flow fan, φ=0.45 31 Figure 15 Example of determining a and b for a typical fan series 32 Figure 16 Typical characteristic curve of a fan with fixed geometric dimensions and variable speed 35 Figure 17 Typical data example of an axial flow fan with constant speed and variable installation angle 38 Figure C.1 Relationship between friction coefficient and Reynolds number of straight pipe 41 Figure C.2 Relationship between friction coefficient and Reynolds number of large radius elbow 42 Table 1 Guidelines for tolerance classes 1 to 4 for fans "aerodynamics and noise"10 Table 2 Manufacturing tolerance grade 11 Table 3 φ, λ and η for different parabola constants and impeller diameters at constant speed Table 4 Octave center frequency 32 Table 5 A-weighted octave correction 33 Table 6 Sound power level in pipe. decibel value based on 10-12 W (1 pW) 36 Preface This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document is equivalent to ISO 13348.2007 "Tolerances, conversions and expression of technical parameters for industrial ventilators". The following minimal editorial changes have been made to this document. --- Corrected the section number referenced in this document from 6.1.4 to 6.4.1 (see 6.5.1); --- Corrected the section number referenced in this document from 6.1.4 to 6.4.1 (see 6.5.2); --- Corrected the section number of ISO 5801.1997 reference from 13.9 to 14.4.1 (see 7.1.1). Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee for Standardization of Fans (SAC/TC187). This document was drafted by. Anshan Gangfeng Blower Co., Ltd., Shenyang Blower Research Institute (Co., Ltd.), Jintongling Technology Group Co., Ltd. Co., Ltd., Weihai Claytfield Fan Co., Ltd., Foshan Nanhai Jiuzhou Huipu Fan Co., Ltd., Guangdong Fanshida Agriculture and Animal Husbandry Fan Co., Ltd., Shenyang Blower Group Ventilation Equipment Technology Co., Ltd., Zhejiang Jindun Fan Co., Ltd., Zhejiang Shuangyang Fan Co., Ltd. Co., Ltd., Zhongshan Aochuang Ventilation Equipment Co., Ltd., Siping Dongda Fan Engineering Co., Ltd., Shenyang Blower Group Co., Ltd., Shenyang Blower Mechanical and Electrical Equipment Import and Export Co., Ltd., Suzhou Dingyu Energy Saving Equipment Co., Ltd., Xinxiang Xima Blower Co., Ltd., Zhejiang Anaijieke Technology Co., Ltd., Zhejiang Mingzhen Electronics Co., Ltd., Zhongshan Yinglai Ventilation Equipment Technology Co., Ltd., Zhejiang Maer Fan Co., Ltd. Co., Ltd., Novenco Intelligent Ventilation Research Institute (Xi'an) Co., Ltd., Beijing Xinante Fan Co., Ltd., Hunan Liancheng Rail Equipment Co., Ltd., Anhui Nanguo Cold and Heat Integrated Energy Co., Ltd. The main drafters of this document are. Yan Longyin, Yang Shuhua, Feng Mingfei, Xu Chao, Tang Xiuwen, Gu Zhongli, Guo Qingfu, Dai Meijun, Dong Mingwei, Yuan Weidong, Wang Riguang, Jiang Yang, Dong Xin, Zhang Shuihua, Zhao Ruhua, Yang Baoliang, Chen Hongxing, Li Wunan, Song Jun, Li Hongye, Bai Hongming, Liu Tiehong, Luan Ye, and Wang Guanglin.

introduction

This document focuses on clarifying the technical issues related to the performance of the ventilator in the contract and the specific Issues with the accuracy and consistency of performance technical indicators. In this document, a distinction is made between ventilators specially designed for a specific purpose and ventilators produced in series, the former being those which meet the contractual requirements. performance data for the latter are included in the sample. Chapter 6 describes a specially designed ventilator, and calculates the aerodynamic and noise performance based on the performance data obtained under the agreed conditions and test conditions. This document also provides four tolerance levels, each of which is suitable for a specific type of ventilator and/or its application. These procedures are considered satisfactory; however, alternative methods may be agreed upon between the supplier and the user. The relevant technical parameters of the uncertified ventilators produced in series will be included in the product technical catalog (electronic or printed), and the relevant calculations will be It is recommended to adopt the tolerance grade method in Chapter 6. The relevant technical parameters of the series-produced ventilators that have passed the certification rating procedure will be included in the product technical catalog (electronic or printed). The calculation is recommended to use the tolerance grade method in Chapter 7, and the certification rating procedure can be completed by an independent certification body with certification qualifications. Industrial ventilator tolerances, conversions and technical parameters Representation method 1 Scope This document applies to the description of performance tolerances and technical parameters of various types of industrial ventilators, and is not applicable to ventilators designed for low-flow air circulation. For fans designed for use (e.g. ceiling fans, table fans), see ISO 13350 for jet fans. The upper limit of the unit mass work of the fan is 25kJ·kg-1, which is equivalent to the average density of the conveying medium of the fan being 1.2kg·m-3. The fan pressure rise is approximately 30kPa. For higher pressure rises, the supplier and the user shall negotiate. This document covers the four device types defined in ISO 5801. Type A. free import and free export; Type B. free inlet, pipe outlet; Type C. Pipe inlet, free outlet; Type D. Pipe inlet, pipe outlet. The performance of the ventilator will vary significantly with the type of device. Therefore, the type of device is an important basis for the technical parameters of the ventilator. Note. The recognition of the above four types of devices enables users and system designers to sign contracts based on the most suitable fan device type. Increases the possibility of providing negotiated ventilator performance without compromise. 2 Normative references The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. ISO 5801.1997 Industrial Fans - Performance testing Note. GB/T 10178-2006 Industrial ventilators - Field performance test (ISO 5802.2001, IDT) ISO 13347-1 Industrial fans — Determination of fan sound power under standard laboratory conditions — Part 1.General requirements eraloverview) Note. GB/T 34877.1-2023 Industrial fans - Determination of sound power levels of fans under standard laboratory conditions - Part 1.General requirements (ISO 13347- 1.2004,IDT) Note. GB/T 41973-2022 Industrial ventilators - Balance quality and vibration level specifications (ISO 14694.2003, IDT) vibration) ...