GB/T 40858-2021 English PDF

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GB/T 40858-2021: General requirements and test methods for receivers of solar thermal power plants
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Basic data

Standard ID: GB/T 40858-2021 (GB/T40858-2021)
Description (Translated English): General requirements and test methods for receivers of solar thermal power plants
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: F12
Word Count Estimation: 42,485
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 40858-2021: General requirements and test methods for receivers of solar thermal power plants

---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.
General requirements and test methods for receivers of solar thermal power plants ICS 27.160 CCSF12 National Standards of People's Republic of China General requirements for collector tubes in solar thermal power stations and Test Methods powerplants (IEC TS62862-3-3.2020, Solarthermalelectricplants-Part 3-3.Systemsand Released on 2021-10-11 2022-05-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅰ Introduction Ⅱ 1 Scope 1 2 Normative references 1 3 Terms, definitions, symbols and units 1 4 Collector tube performance test 2 4.1 General provisions 2 4.2 Identification and parameters 2 4.3 Manufacturing Instructions 2 4.4 Test instrument calibration 2 4.5 Heat loss test 2 4.6 Optical characteristic test 13 4.7 Durability test of collector tube 21 Appendix A (informative) Test report format 32 A.1 Description of collector tube (provided by manufacturer) 32 A.2 Test results---heat loss 33 A.3 Test Results---Optical Characteristic Test 34 A.4 Test results---Optical efficiency test 34 A.5 Test Results---Static Abrasion Test 35 A.6 Test results---Condensation test 35 A.7 Test Results---Impact Resistance Test. Method 1---Ice Hockey 35 A.8 Test Results---Impact Resistance Test. Method 2---Steel Ball 36 A.9 Test Results---The thermal stability test of the selective absorption coating of the collector tube 36 A.10 Test Results --- Thermal Stability Test of Selective Absorption Film of Steel Pipe Sample 36 A.11 Test results---thermal cycle test 37 A.12 Test results --- Bellows test 37 Appendix A (informative) Test report format 32 Appendix B (Informative) Application Note. Temperature Measurement in Heat Loss Test of Cartridge Heater --- Temperature Measurement Offset Correction 38 Reference 39

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. The translation method used in this document is equivalent to the IEC TS62862-3-3.2020 "Solar Thermal Power Station Part 3-3.System and Department General Requirements and Test Methods for Heat Collecting Tubes", the document type is adjusted from IEC technical specifications to my country’s national standards. The Chinese documents that have consistent correspondence with the normatively cited international documents in this document are as follows. ---GB/T 12936-2007 Solar thermal utilization term (ISO 9488.1999, NEQ). The following editorial changes have been made to this document. ---Formula (3) parameter description "T1/2/N/N-1" amended to "T1, T2, TN, TN-1"; --- Formula (7) Supplementary parameter description. "dabs is the inner diameter of the heat absorption tube"; ---"Labs,RT" in formula (7) is revised to "labs,RT"; ---The unit "[m/℃]" of kabs in the parameter description of formula (9) is revised to "[W/(m·℃)]"; --- "ST" in formula (12) is revised to "STH"; --- The unit of coefficient a2 in formula (18) "[W/(m·℃4)]" is revised to "[W/(m·℃4)]"; --- The number "(12)" of formula (12) mentioned in 4.5.8.2 is amended to "(18)"; --- The number "(12)" of formula (12) mentioned in 4.5.8.3 is amended to "(18)"; --- The unit "(W/(m∙℃))" of the coefficient b1 in 4.5.8.4 is redundant and deleted; --- The unit of coefficient b2 in 4.5.8.4 "(W/(m∙℃2))" is revised to "(℃-2)"; --- The number "(13)" of formula (13) mentioned in 4.5.8.4 is amended to "(19)"; --- Formula (24) supplementary parameter description. "ΔT---fluid temperature rise, in degrees Celsius (℃)"; --- "4.7.1" mentioned in 4.7.6.3 is amended to "4.6.2"; --- "4.7" mentioned in 4.7.7.2 is amended to "4.6"; --- Formula (B.2) Supplementary parameter description. "In the formula, A, B, C, D, E, F are polynomial coefficients.". Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by the China Enterprise Confederation. This document is under the jurisdiction of the National Standardization Technical Committee for Solar Thermal Power Generation (SAC/TC565). This document was drafted by. Changzhou Longteng Solar Thermal Technology Co., Ltd. The main drafters of this document. Yu Ke, Hu Qiao, Fang Quanxi, Han Yingying, Zhang Lingyan, Shen Weiwen, Meng Qingyan, Zhang Xiaolong, Zhu Long, Wang Chengyu.

Introduction

The collector tube is one of the core components of the solar thermal power station. The performance and durability of the collector tube are essential for the successful implementation of the solar thermal power station. And stable operation is very important. In order to standardize the general requirements of solar thermal power station heat collector tubes and unify the test method, it is necessary to standardize it. change. With the continuous construction of domestic solar thermal power plants, it is very necessary to establish universal and unified heat collection tube requirements and test methods. Objectively and reasonably evaluate the performance and durability of the collector tube, promote the standardized development of solar thermal power stations, and ensure the long-term stability of solar thermal power stations. Scheduled to run. The collector tube is one of the most important and sensitive parts of Fresnel and parabolic trough power stations. The large mirror group is aligned and arranged along the mirror The focal line concentrates up to 80 times the solar radiation onto the coated and evacuated heat collector tube. The generated heat is transported to the power generation device through the heat transfer fluid, And converted into electrical energy. The long-term stability of the quality and performance of the collector tube has a decisive influence on whether solar radiation can be effectively converted into heat energy. In order to make the power station To achieve the highest efficiency, the collector tube must absorb as much solar radiation as possible and convert it into heat with minimal loss. The collector tube (see Figure 1) mainly includes. ● Steel heat-absorbing tube. The heat transfer fluid flows through the stainless steel heat-absorbing tube. The high-quality heat-absorbing tube coating can convert solar radiation into heat energy, and at the same time Minimize infrared heat loss; ● Glass casing. The casing is made of borosilicate glass and coated with an anti-reflection coating to increase the solar transmittance; ● The area (annular space) filled with inert gas or evacuated between the heat absorption tube and the glass sleeve. between the heat absorption tube and the glass sleeve The vacuum between is a necessary condition to suppress the convective heat transfer of the gas; ● Bellows. The bellows is necessary to compensate the different thermal expansion coefficients of the steel heat-absorbing tube and the glass sleeve. Contrary to glass sleeve, suction The heat pipe expands greatly during operation. Figure 1 Schematic diagram of collector tube General requirements for collector tubes in solar thermal power stations and Test Methods

1 Scope

This document specifies the use of line-focusing collectors in solar thermal power plants for absorbing focused solar radiation and heating it. The technical requirements, test methods, durability and technical performance parameters of the heat collection tube that can be transferred to the heat transfer fluid. The collector tube described in this document consists of It consists of a heat-absorbing tube and an insulating glass sleeve. Note 1.Most of the test methods contained in this document are applicable to the collector tubes in parabolic trough CSP stations and Fresnel CSP stations. This document contains the definitions of the technical characteristics, geometric characteristics and performance parameters of the collector tube, as well as the measurement of optical characteristics, heat loss and durability. Try the method. Note 2.At present, the accumulated experience of different test methods for collector tubes is not enough to determine which test method is the best. This document describes the currently available All the different methods used, but no recommended method is defined. For the sake of clarity, it is hereby stated that the heat loss test results described in this document do not represent the collector tubes installed in the collector field of a commercial power station The heat loss. The heat loss value obtained in the indoor test on a single collector tube is significantly lower than that under the actual outdoor operating conditions of the collector field of a commercial power station The heat loss value. Therefore, the indoor test procedures described in this document are suitable for the performance comparison of collector tubes. The heat loss considered in the design of the collector field is obtained by testing the complete collector in operation under actual solar conditions.

2 Normative references

The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 13893.2-2019 Determination of moisture resistance of paints and varnishes Part 2.Condensation (in a test chamber with a heated water tank Internal exposure) (ISO 6270-2.2017, IDT) ISO 9488 Solar Energy Vocabulary (Solarenergy-Vocabulary) ISO 9806.2017 Test method for solar solar collectors (Solarenergy-Solarthermalcolectors- Testmethods) IEC TS62862-1-1 Solar thermal power plant Part 1-1.Terminology (Solarthermalelectricplants-Part 1-1. Terminology) ASTMG173-03 reference solar radiation spectrum standard table. direct normal and hemispherical direction on 37° inclined surface (Standard TablesforReferenceSolarSpectralIrradiances.DirectNormalandHemisphericalon37°TiltedSur- face) MIL-E-12397 Eraser, rubber pumice (for testing coated optical components) [Eraser, Rubber-Pumice (fortesting coatedopticalelements)] 3 Terms, definitions, symbols and units The terms, definitions, symbols and units defined in ISO 9488 and IEC TS62862-1-1 apply to this document. ......

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