GB/T 38588-2020 English PDF

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GB/T 38588-2020: In-situ measurements of heat loss of insulating pipes for urban heat-supplying
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 38588-2020	469	Add to Cart	5 days	In-situ measurements of heat loss of insulating pipes for urban heat-supplying	Valid

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Basic data

Standard ID: GB/T 38588-2020 (GB/T38588-2020)
Description (Translated English): In-situ measurements of heat loss of insulating pipes for urban heat-supplying
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: P46
Classification of International Standard: 91.140.10
Word Count Estimation: 25,28
Date of Issue: 2020-03-31
Date of Implementation: 2021-02-01
Quoted Standard: GB/T 10295; GB/T 17357; JJF 1059.1-2012
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the terms, definitions and symbols, test methods, test grading and use conditions, test requirements, data processing, test errors and test reports of on-site detection methods for heat dissipation loss of urban heating and thermal insulation pipe network systems. This standard is applicable to the on-site detection of heat dissipation loss of urban heating and thermal insulation pipes, pipe joints and their accessories (hereinafter referred to as pipes) where the temperature of the hot water medium is less than or equal to 150��C and the temperature of the steam medium is less than or equal to 350��C.

GB/T 38588-2020: In-situ measurements of heat loss of insulating pipes for urban heat-supplying

---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.
In-situ measurements of heat loss of insulating pipes for urban heat-supplying ICS 91.140.10 P46 National Standards of People's Republic of China Heat loss of urban heating and heat preservation pipe network system On-site testing method 2020-03-31 release 2021-02-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Contents

Foreword I 1 Scope 1 2 Normative references 1 3 Terms, definitions and symbols 1 3.1 Terms and definitions 1 3.2 Symbol 2 4 Test Method 4 4.1 Heat flow meter method 4 4.2 Surface temperature method 4 4.3 Temperature difference method 6 4.4 Thermal balance method 7 5 Test classification and conditions of use 8 5.1 Test classification and selection 8 5.2 Test instruments and meters 8 6 Test requirements 9 6.1 Test preparation 9 6.2 Test cross-section and measuring point arrangement 9 6.3 Test environmental conditions 10 6.4 Test Step 11 7 Data processing 11 7.1 Data collation 11 7.2 Calculation of heat loss 11 8 Test error 13 8.1 Error analysis 13 8.2 Error range 13 9 Test report 13 Appendix A (Normative) Heat flux density correction 14 Appendix B (Normative Appendix) Calculation of Total Heat Transfer Coefficient by Surface Temperature Method 16 Appendix C (Normative Appendix) Questionnaire for Insulation Pipeline 19 Appendix D (Normative Appendix) Test Data Record Table for Thermal Loss of Thermal Insulation Structure of Thermal Insulation Pipeline 21

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the Ministry of Housing and Urban-Rural Development of the People's Republic of China. This standard is under the jurisdiction of the National Urban Heating Standardization Technical Committee (SAC/TC455). This standard was drafted by. Haotian Energy Saving Equipment Co., Ltd., Beijing Construction Engineering Quality Testing Institute No. 4, Beijing Gas Heating Power Engineering Design Institute Co., Ltd., Hebei Haotian Thermal Development Co., Ltd., Changchun Thermal (Group) Co., Ltd., Hebei Huare Engineering Design Co., Ltd., Harbin Institute of Technology, Beijing Haotene Pipeline Equipment Co., Ltd., Sichuan Xinzhongtai New Material Co., Ltd., Tangshan Xingbang Pipe Engineering Equipment Co., Ltd., Harbin Langst Energy Saving Technology Co., Ltd., Tianjin Tiandilong Pipe Co., Ltd., Henan Sanjie Re Electric Technology Co., Ltd., Hebei Junye Technology Co., Ltd., Dalian Kehua Thermal Pipeline Co., Ltd., Jiangfeng Pipeline Group Co., Ltd. Division, Wanhua Chemical (Yantai) Sales Co., Ltd., Dow Chemical (China) Investment Co., Ltd., Shanghai Huntsman Polyurethane Co., Ltd., Hebei Feng Cheng Pipeline Co., Ltd., Tianhua Chemical Machinery and Automation Research and Design Institute Co., Ltd., Langfang Huayu Tianchuang Energy Equipment Co., Ltd., Hebei Yirui Testing Technology Co., Ltd., Hebei Haotian Energy Investment Group Co., Ltd., China Municipal Engineering North China Design and Research Institute Co., Ltd., Beijing Haotian Huaqing Municipal Engineering Design Co., Ltd. The main drafters of this standard. Zheng Zhongsheng, Zhang Guoyu, Lang Kuiyuan, Bai Dongjun, Jia Zhen, Zhang Jianxing, Li Min, Zhang Qi, Wang Peng, Jia Lihua, Li Xiang, Qiu Huawei, Lai Zhencheng, Liu Xiuqing, Chen Peng, Yang Zhili, Yang Qiu, Zhang Songlin, Pang Dezheng, Sun Tao, Zhong Hualiang, Zhao Xiangbin, Jia Hongqing, Duan Wenyu, Qiu Xiaoxia, Wang Zhenhai, Yang Liangzhong, Wang Ying, Feng Wenliang and Zhang Zhiming. Heat loss of urban heating and heat preservation pipe network system On-site testing method

1 Scope

This standard specifies the terms, definitions and symbols of the on-site detection method for heat loss of urban heating and insulation pipe network system, test method, test Classification and conditions of use, test requirements, data processing, test errors and test reports. This standard applies to urban heating and heat preservation with hot water medium temperature less than or equal to 150 ℃ and steam medium temperature less than or equal to 350 ℃ On-site detection of heat loss of pipes, pipe interfaces and accessories (hereinafter referred to as pipes).

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document. GB/T 10295 Determination of steady-state thermal resistance and related characteristics of thermal insulation materials GB/T 17357 On-site determination of surface heat loss of equipment and pipeline insulation layer Heat flow meter method and surface temperature method JJF1059.1-2012 Evaluation and expression of measurement uncertainty 3 Terms, definitions and symbols 3.1 Terms and definitions The following terms and definitions apply to this document. 3.1.1 Steady heat transfer The heat transfer process in which the radial temperature of each point does not change with time in the thermal insulation layer of the thermal insulation pipeline. 3.1.2 Heat flowmeter method heatflowmeterapparatusmethod Using thermal resistance type heat flow sensor (heat flow probe) and measurement indicator to directly measure the heat flow of the heat transfer of the insulation structure of the insulation pipe Density test method. 3.1.3 Surface temperature method By measuring the temperature of the outer surface of the thermal insulation structure, the ambient temperature, the wind direction and speed, the surface thermal emissivity, and the external dimensions of the thermal insulation structure, it is calculated Its radial heat transfer test method of heat flux density. 3.1.4 Temperature difference method By measuring the thickness of each layer of the insulation structure, the temperature at the interface of each layer, and the thermal conductivity of each layer of material at the use temperature, Calculate the heat flux density test method for the radial heat transfer of the insulation structure. 3.1.5 Heat balance method Under the stable operating conditions of the pipe network system, on-site determination of the medium flow of the measured pipeline, the medium temperature and (or) pressure of the beginning and end of the pipeline Force, according to the enthalpy difference method or the principle of energy balance, the method of calculating the whole heat loss value of the pipeline. ......

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