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Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 28638-2023: Heat loss test for thermal insulation structure and evaluation methods for thermal insulation efficiency of district heating pipes Status: Valid GB/T 28638: Historical versions
Basic dataStandard ID: GB/T 28638-2023 (GB/T28638-2023)Description (Translated English): Heat loss test for thermal insulation structure and evaluation methods for thermal insulation efficiency of district heating pipes Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: P46 Classification of International Standard: 91.140.10 Word Count Estimation: 34,377 Date of Issue: 2023-08-06 Date of Implementation: 2024-03-01 Older Standard (superseded by this standard): GB/T 28638-2012 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 28638-2023: Heat loss test for thermal insulation structure and evaluation methods for thermal insulation efficiency of district heating pipes---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. ICS 91.140.10 CCSP46 National Standards of People's Republic of China Replace GB/T 28638-2012 Heat dissipation loss of urban heating pipe insulation structure Testing and insulation effect assessment methods Published on 2023-08-06 2024-03-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration Committee Table of contentsPreface III 1 Scope 1 2 Normative reference documents 1 3 Terms and Definitions 1 4 Test method 2 5 Test Classification and Requirements 9 6 Test procedures 10 7 Data processing 13 8 Test error 15 9 Insulation effect evaluation15 10 Test Report 16 Appendix A (normative) Cooling heat flux value correction 17 Appendix B (Normative) Calculation of the total heat release coefficient of the outer surface of the thermal insulation structure 19 Appendix C (informative) Heating pipeline conditions and meteorological data survey form 23 Appendix D (normative) Thermal balance method test data processing 25 Appendix E (informative) Test data record table for heat dissipation loss of heating pipe insulation structure 27 Appendix F (normative) The maximum allowable heat loss value of the heating pipe insulation structure is 29ForewordThis document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document replaces GB/T 28638-2012 "Heat dissipation loss test and insulation effect assessment method for urban heating pipe insulation structures" and is consistent with Compared with GB/T 28638-2012, in addition to editorial changes, the main technical changes are as follows. ---Changed the scope of application (see Chapter 1, Chapter 1 of the.2012 edition); --- Added terms and definitions for the comprehensive thermal resistance of pipeline insulation structures (see 3.1); ---Added test methods for pipes laid in pipe galleries and tunnels (see Chapter 4, Chapter 6, and Chapter 7); ---Changed the heat flow sensor error (see 4.1.6, 4.1.7 of the.2012 version); ---Deleted the on-site test conditions for heat flow meter testing (see 4.1.8~4.1.10 of the.2012 version); ---Changed the test method of thermocouples [see 4.2.6,.2012 version 4.2.5.2b)]; ---Changed the test method of thermal resistance (see 4.2.7); ---Deleted the ambient temperature test conditions for surface temperature method testing [see.2012 version 4.2.6a), b)]; ---Changed the conditions for calculating heat flow density of external protective tubes (see 4.3.5, 4.3.4 of the.2012 version); ---Changed the sampling and testing methods for pipeline soil thermal conductivity (see 4.3.10, 4.3.9 of the.2012 version); ---Deleted the requirement of the heat balance method on whether the pipeline is leaking [2012 version 4.4.2a)]; ---Changed the maximum temperature of the heating source of the laboratory simulation test system [see 4.5.3a),.2012 version of 4.5.3a)]; ---Changed the on-site test section and measuring point layout method [see 6.2.2d), e),.2012 version of 6.2.2d)]; ---Added on-site environment measurement methods (see 6.4); ---Changed the pipeline operating conditions during testing (see 6.5.1, 6.4.1 of the.2012 version); ---Added on-site test conditions (see 6.5.2); ---Changed the data collection methods of heat flow meter method, surface temperature method and temperature difference method (see 6.5.5, 6.4.4 of the.2012 version); ---Added data collection method for thermal balance method (see 6.5.6); ---Added thermal balance method test data processing method (see 7.1.4); ---Added the calculation method of heat loss rate of heating pipe insulation structure (see 7.2.9); ---Changed the basis for thermal insulation effect evaluation (see 9.1,.2012 version of 9.1); ---Deleted the conformity assessment of test results (see 9.2 of the.2012 version); ---Added the classification of heat loss rate levels of heating pipe insulation structures (see 9.2); ---Changed the cooling heat flux value correction method (see Appendix A, Appendix A and Appendix B of the.2012 version); ---The maximum allowable heat loss value of the heating pipe insulation structure has been changed (see Appendix F). Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents. This document is proposed by the Ministry of Housing and Urban-Rural Development of the People's Republic of China. This document is under the jurisdiction of the National Urban Heating Standardization Technical Committee (SAC/TC455). This document was drafted by. Beijing Municipal Public Utilities Research Institute, China Urban Construction Research Institute Co., Ltd., China Municipal Engineering North China Design and Research Institute Co., Ltd., Taizhou Longjiang Chemical Machinery Technology Co., Ltd., Tangshan Xingbang Pipeline Engineering Equipment Co., Ltd., Harbin Engineering University of Technology, Beijing Gas Thermal Engineering Design Institute Co., Ltd., Beijing Thermal Equipment Manufacturing Co., Ltd., Xi'an Shuangji Energy Saving Technology Co., Ltd. Division, Tianjin Taihe Energy Saving Technology Co., Ltd., Hebei Fengcheng Pipeline Co., Ltd., Liaoning Hongxin Energy Saving Technology Co., Ltd., CIC (Tianjin) Intelligent Pipeline Co., Ltd., Hebei Yirui Testing Technology Co., Ltd., Langfang Huayu Tianchuang Energy Equipment Co., Ltd., Dalian Kaiyuan Pipeline Co., Ltd. Company, Jiangfeng Pipeline Group Co., Ltd., Shandong Maosheng Pipe Industry Co., Ltd., Haolian Insulation Pipe Industry Co., Ltd., Hebei Qianhai Pipeline Manufacturing Co., Ltd. Company, Liaoning Jiangfeng Insulation Materials Co., Ltd., Tianjin Tiandilong Pipe Industry Co., Ltd., Xinxing Cast Pipe Co., Ltd., Beijing Heating Power Engineering Design Co., Ltd., Haotian Energy Saving Equipment Co., Ltd., Dalian Kehua Thermal Pipeline Co., Ltd., Hebei Junye Technology Co., Ltd. Co., Ltd., Wanhua Chemical Group Co., Ltd., Inner Mongolia Weizhijie Energy Saving Equipment Co., Ltd., Tianjin Yugang Insulation Building Materials Co., Ltd. Division, Yantai Shunda Polyurethane Co., Ltd., China Petroleum Engineering Construction Co., Ltd. North China Branch, Shanghai Kehua Thermal Pipeline Co., Ltd. Company, Beijing Huaneng Thermal Insulation Engineering Co., Ltd., Tianjin University, Beijing China Construction Building Research Institute Co., Ltd., Sanjie Energy Saving New Materials Co., Ltd. Co., Ltd., Qingdao Xinhuide Anti-corrosion Insulation Co., Ltd., Henan Ruite Thermal Pipe Technology Co., Ltd., Beijing Construction Engineering Quality No. 4 TESTS LIMITED. The main drafters of this document. Bai Dongjun, Feng Wenliang, Luo Cheng, Yan Yongpeng, Wang Peng, Yang Xuefei, Bai Liying, Gao Hongze, Xiong Conggui, Qiu Huawei, Hu Chunfeng, Liu Xihuai, Zhao Xiangbin, Xuan Lingguo, Liu Jianshe, Wang Lei, Ye Lianji, Zhai Baohuan, Zhang Songlin, Chen Junjie, Yan Jianguo, Sun Xiangfei, Ning Jiangtao, Liu Xiuqing, Shi Wenbo, Gao Hui, Li Xianshi, Zheng Zhongsheng, Yang Qiu, Li Deheng, Leng Boxun, Yan Minghai, Yan Bixing, Ye Liuliang, Zhao Changying, Chen Lei, Luo Wenfeng, Ma Xiaoyu, Chen Peng, Du Lisong, Yu Lukun, Ren Jing, Zhang Tao, Shen Xu, Wang Xueyue. This document was first published in.2012 and this is the first revision. Heat dissipation loss of urban heating pipe insulation structure Testing and insulation effect assessment methods1 ScopeThis document specifies the test methods, test classifications and requirements for heat loss testing and insulation effect assessment of urban heating pipe insulation structures. Test procedures, data processing, test errors, insulation effect evaluation and test reports. This document is suitable for testing the heat loss and insulation effect of urban heating pipes, pipe accessories and insulation structures at pipe interfaces. assessment.2 Normative reference documentsThe contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document. GB/T 4132 Thermal insulation materials and related terms GB/T 8174 Testing and evaluation of thermal insulation effect of equipment and pipelines GB/T 10295 Heat flow meter method for determination of steady-state thermal resistance and related characteristics of thermal insulation materials GB/T 10296 Round tube method for determination of steady-state heat transfer properties of insulation layers GB/T 27418 Evaluation and expression of measurement uncertainty GB/T 29046 Testing method for technical indicators of prefabricated insulated pipes for urban heating3 Terms and definitionsThe terms and definitions defined in GB/T 4132 and GB/T 8174 and the following apply to this document. 3.1 Under steady-state heat transfer conditions, the ratio of the temperature difference between the inner and outer surfaces of the pipeline insulation structure to the linear heat flux density per unit length of the pipeline. 3.2 In the laboratory, the heat loss test of the pipeline insulation structure is carried out to simulate the environmental conditions and operating conditions of the heating pipeline. 3.3 During the laboratory simulation test, the thermal insulation structure coefficient calculated from the heat flow density measured on the pipeline and the internal and external surface temperatures of the pipeline insulation structure. thermal coefficient. 3.4 metastable statepseudosteadystate The heat transfer state when the average reading value of the heat flow sensor does not differ by more than 2% in two consecutive 5-min periods. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 28638-2023_English be delivered?Answer: Upon your order, we will start to translate GB/T 28638-2023_English as soon as possible, and keep you informed of the progress. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 28638-2023?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 28638-2023 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
