NB/T 10415-2020 English PDFUS$349.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. NB/T 10415-2020: (Medium temperature glass-metal sealed vacuum direct solar collector tube) Status: Valid
Basic dataStandard ID: NB/T 10415-2020 (NB/T10415-2020)Description (Translated English): (Medium temperature glass-metal sealed vacuum direct solar collector tube) Sector / Industry: Energy Industry Standard (Recommended) Classification of Chinese Standard: F12 Word Count Estimation: 15,190 Date of Issue: 2020-10-23 Date of Implementation: 2021-02-01 Regulation (derived from): National Energy Administration Announcement No. 5 of 2020 Issuing agency(ies): National Energy Administration NB/T 10415-2020: (Medium temperature glass-metal sealed vacuum direct solar collector tube)---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.Glass-metal sealed direct connection evacuated solar collector tube for medium temperature Energy Industry Standards of the People's Republic of China Medium temperature glass-metal sealed vacuum direct solar collector tube 2020-10-23 released 2021-02-01 implementation Issued by the National Energy Administration Table of contentsPreface...2 1 Scope...3 2 Normative references...3 3 Terms and definitions...3 4 Structure and coding...4 5 Technical requirements...5 6 Test method...6 7 Inspection rules...8 8 Marking, packaging, transportation, storage...9 Appendix A (Normative) Test Method for Heat Loss Coefficient of Straight Pipe...10 References...16ForewordThis document starts from the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" grass. This document was proposed by the China Rural Energy Industry Association and the General Station of Agricultural Ecology and Resources Protection of the Ministry of Agriculture and Rural Affairs. This document is under the jurisdiction of the Energy Industry Rural Energy Standardization Technical Committee (NEA/TC8). This document is organized and drafted by the Solar Thermal Utilization Professional Committee of China Rural Energy Industry Association. This document was drafted by. Zhejiang Solar Product Quality Inspection Center, Shaanxi Baoguang Vacuum Appliance Co., Ltd., Shandong Logan Tianxu Solar Energy Co., Ltd., Hebei Daorong New Energy Technology Co., Ltd., Shandong Guangpu Solar Energy Engineering Co., Ltd., Beijing Sunda Solar Energy Technology Co., Ltd., Danyang Kaixin Alloy Material Co., Ltd., Zhejiang Shentai Solar Energy Co., Ltd., Haining Denuo Solar Equipment Co., Ltd., Zhejiang Haiguang Energy Co., Ltd., Shandong Yaoguo Solar Thermal Technology Co., Ltd., Taibiao Solar Energy Equipment Co., Ltd., Yuxi City, Yunnan Province Equipment Co., Ltd., Beijing Huaye Sunshine New Energy Co., Ltd., Shandong Xupo New Material Co., Ltd., Nanjing Kezhifeng Energy-saving Technology Co., Ltd. Company, Lianyungang Zhongwo Solar Energy Technology Co., Ltd., Beijing Zhaoyangguang Thermal Technology Co., Ltd., China Academy of Building Research Co., Ltd., Institute of Electrical Engineering, Chinese Academy of Sciences. The main drafters of this document. Ling Deli, Gao Hui, Xing Zuoxin, Xue Daorong, Min Qingxi, Sun Shoujian, Jing Zhengwei, Yu Haiqiang, Zhou Shu Yuan, Wang Guowei, Weng Changjin, Zhang Yonglin, Zhou Xiaowen, Li Fengde, Fang Wenchao, Gu Changjie, Du Ming, Wang Min, Lei Dongqiang, Jia Tieying, Shen Bin. Medium temperature glass-metal sealed vacuum direct solar collector tube1 ScopeThis document specifies the structure, coding and technology of the medium temperature glass-metal sealed vacuum direct solar collector tube (hereinafter referred to as the direct tube) Requirements, test methods and inspection rules, etc. This document is suitable for receiving solar radiation in trough type, linear Fresnel type and other medium-temperature solar thermal utilization systems, and the working temperature range is 100 ℃ ~300℃ medium temperature glass-metal sealed vacuum direct solar collector tube, other direct solar collectors similar to glass-metal inner tube structure The pipe can be implemented by reference.2 Normative referencesThe contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated reference documents, Only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document file. GB/T 12936 Terminology for Solar Thermal Utilization GB/T 13384 General technical conditions for packaging of mechanical and electrical products GB/T 17395 Seamless steel pipe size, shape, weight and allowable deviation GB/T 19775-2005 Glass-metal sealed heat pipe vacuum solar collector tube GB/T 29159-2012 Glass tube for all-glass evacuated solar collector tube GB/T 25965 Test method for material normal emission ratio and all-glass vacuum solar collector tube hemisphere emission ratio GB/T 25968 Spectrophotometer test method for measuring solar transmittance and solar absorption ratio of materials3 Terms and definitionsThe following terms and definitions defined in GB/T 12936 and GB/T 19775-2005 apply to this document. 3.1 Medium temperature glass-metal sealed direct connection collector tube for vacuum direct connection collector tube for medium temperature There is a vacuum space between the glass cover tube and the metal heat-absorbing tube, and the two ends are connected by Kovar transition seal to absorb solar radiation and produce The heat is transferred to the components of the heat transfer medium. 3.2 Sealing leak rate of glass and metal pipes The amount of gas passing through the Kovar transition seal joint in a unit time between the glass cover tube and the metal heat absorption tube under a known pressure difference. Note. The sealing leak rate is expressed in Pa·m3/s. 3.3 Metal absorber tube The outer surface is provided with a solar selective absorption coating, which is a metal tube used to absorb solar radiation and convert it into heat energy of the fluid in the tube. 3.4 Heat loss coefficient The heat loss power value per unit length of the straight-through tube under the given temperature condition.4 Structure and coding4.1 Product structure The structure and components of the straight pipe are shown in Figure 1. 1-- Glass-to-metal seal 2-- getter 3-- Glass cover tube 4-- Metal heat-absorbing tube 5-- Metal connection section 6-- Medium flow path 7-- Vacuum sandwich 8-- Corrugated elastic connecting pipe L-- the total length of the straight pipe at room temperature Lc-- length of connecting section Ls-- sealing length Dabs-- outer diameter of metal heat absorbing tube Dg-- outer diameter of glass cover tube 4.2 Structure size Refer to Table 1 for the recommended specification sequence of the structure size of the straight-through pipe. 4.3 Product Code The coding structure of the straight-through tube is shown in Figure 2. Example. ZBJ-40/1.5-90/2.0-2000 means that the outer diameter of the metal heat-absorbing tube is 40mm, the wall thickness of the metal heat-absorbing tube is 1.5mm, and the outer diameter of the glass cover tube is 90mm. The glass cover tube has a wall thickness of 2.0mm and a total length of.2000mm with a medium-temperature glass-metal sealed vacuum straight-through solar collector tube.5 Technical requirements5.1 Appearance 5.1.1 The stones on the glass cover tube should comply with the provisions in 6.1.3 of GB/T 19775-2005, and the nodules should comply with the provisions of GB/T 19775-2005. According to the provisions of 6.1.4, the length of the gas line shall comply with the provisions of 6.1.5 of GB/T 19775-2005. 5.1.2 The heat-absorbing body coating on the metal heat-absorbing tube should be uniform in color, free of fingerprints, dirt, peeling, peeling, and obvious scratches. 5.2 Dimensional deviation The curvature of the glass cover tube should not be greater than 0.2%; the outer diameter and wall thickness of the metal heat-absorbing tube should meet the relevant regulations of GB/T 17395; The measured length of the tube should not be greater than ±0.5% of the nominal value, and the measured outer diameter of the glass cover tube should not be greater than ±5mm of the nominal value. 5.3 Circumference grade The circumcision grade of the glass cover tube should not be greater than HQ-6. 5.4 Optical performance 5.4.1 The solar transmittance of the glass cover tube should not be less than 0.90 (AM1.5) (the transition area at both ends of the non-glass cover tube). 5.4.2 The solar absorption ratio of the metal heat-absorbing tube coating should not be less than 0.92 (AM1.5). 5.4.3 The hemispheric emission ratio of the solar selective absorption coating should not be greater than 0.08 (150℃±1℃). 5.5 Sealing leakage rate The leak rate of glass and metal sealing should be less than 1.0×10-10 Pa·m3/s. 5.6 Vacuum performance The gas pressure in the vacuum interlayer of the straight pipe should not be greater than 5×10-2Pa. During the test, there should be weak fluorescence on the glass wall, and there should be no Glow discharge, sparks penetrate the glass wall or sparks diverge without fluorescence on the glass wall. 5.7 Mechanical strength 5.7.1 The straight-through pipe should be able to withstand the impact of a solid steel ball with a diameter of 30mm and a height of not less than 1.4m without being damaged. 5.7.2 After the corrugated elastic connecting pipe has undergone 12,000 simulated displacement tests, the sealing leakage rate shall meet the requirements of 5.5. 5.8 Heat loss coefficient The heat loss coefficient of the straight-through pipe should meet the requirements of Table 3. 5.9 Weather resistance 5.9.1 High temperature deformation curvature After the straight pipe deformation and curvature test, the deformation curvature per meter of the straight pipe should not be greater than 5mm. 5.9.2 External thermal shock After the external thermal shock test, the glass cover tube should be free of damage such as bursting or cracking, and the glass-metal seal should not be deformed, bursting, or leaking. 5.9.3 Low temperature resistance After the low temperature resistance test, the through pipe should be undamaged.6 Test method6.1 Appearance 6.1.1 Inspect the stones, nodules and the length of the air line on the glass cover tube, and record the inspection results. 6.1.2 Visually inspect the appearance of the heat-absorbing body coating on the metal heat-absorbing tube, and record the inspection result. 6.2 Dimensional deviation Place the straight-through pipe horizontally on the V-shaped test support, and the two ends are sealed at the supporting point. Use a dial indicator to measure the middle of the straight pipe The maximum and minimum radial dimensions of, the sum of the maximum and minimum radial dimensions divided by 2 times the length of the glass cover tube is the curvature of the glass cover tube; use accuracy Measure and record the outer diameter and wall thickness of the metal heat-absorbing tube with a 0.02mm micrometer; measure and record the length of the straight pipe with a steel tape with an accuracy of 1mm; Measure and record the outer diameter and wall thickness of the glass cover tube with a micrometer with an accuracy of 0.02mm. 6.3 Circumference grade The test method for the circumcision grade of the glass cover tube is carried out in accordance with the provisions of Appendix A in GB/T 29159-2012 6.4 Optical performance 6.4.1 Cut the glass cover tube in the transition area between the two ends of the non-glass cover tube on the straight tube. The sample size should meet the requirements of the spectrophotometer. The spectrophotometer with integrating sphere is in the wavelength range of 300nm～2500nm, and the light rays are respectively with the convexity of the glass sample intercepted on the glass cover tube. Measure the solar transmittance of the glass cover tube according to the regulations of GB/T 25968.The concave surface and the convex surface of the glass sample are each done 3 times. take the average. 6.4.2 Cut the metal heat absorption tube of the straight tube, the sample size should meet the requirements of the spectrophotometer, use a spectrophotometer with an integrating sphere In the wavelength range of 300nm～2500nm, measure the absorption ratio of the metal heat absorption tube coating according to the provisions of GB/T 25968. 6.4.3 The test method for the hemispherical emission ratio of the solar selective absorption coating is carried out in accordance with the provisions of GB/T 25965, and the test temperature is adjusted to 150℃ ±1℃. 6.5 Sealing leakage rate Connect the detection interface of the helium mass spectrometer leak detector with the exhaust nozzle of the straight pipe, and the helium mass spectrometer leak detector will pump the inner cavity of the straight pipe. When the instrument shows that the detectable leak rate in the glass cover tube is less than 1.0×10-10 Pa·m3/s, use a gas bag filled with helium to cover all the seals and continue 30s. The leak rate displayed by the instrument should not increase. 6.6 Vacuum performance Use a spark leak detector to detect the vacuum interlayer at the glass-metal sealing end of the through tube in a darkroom environment, and check the vacuum condition according to the discharge color Make qualitative judgments. 6.7 Mechanical strength 6.7.1 The straight-through pipe is fixed horizontally and fixedly installed on the test frame, supported by two V-grooves with 5mm thick polyurethane gaskets spaced 1500mm apart. The steel ball with a diameter of 30mm is aligned with the middle of the collector tube and the middle of the two fulcrums. The bottom of the steel ball is 1400mm from the impact point of the glass cover tube and falls freely. Hit the straight pipe vertically. 6.7.2 Perform 12,000 simulated displacement tests on the corrugated elastic connecting pipe with a reciprocating test device, and the period of each simulated displacement test is 2s, The displacement is 2mm per wave. After the test, the sealing leakage rate test shall be carried out in accordance with 6.5. 6.8 Heat loss coefficient The heat loss coefficient test method is carried out in accordance with Appendix A. 6.9 Weather resistance 6.9.1 High temperature deformation curvature Place the straight tube on the V-shaped bracket, mark the height of the center position of the straight tube before heating by means of vertical projection, the oil pump circulates heat conduction oil,... ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of NB/T 10415-2020_English be delivered?Answer: Upon your order, we will start to translate NB/T 10415-2020_English as soon as possible, and keep you informed of the progress. 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