GB/T 46248-2025Test method for heat loss coefficient of parabolic trough solar receiver tube (English PDF)
槽式太阳能集热管热损系数测试方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 29, 2025
Implementation date
March 1, 2026
Scope
GB/T 46248-2025 is the English-translated version of 槽式太阳能集热管热损系数测试方法.
GB/T 46248-2025 is the Chinese national standard covering how much heat a receiver tube loses at operating temperature — the heating of the absorber without sunlight, the steady-state power measured against absorber temperature, the vacuum in the annulus and what its loss does to the coefficient, and the curve that goes into the yield model of a plant. First edition, in force from 1 March 2026. Issued on 29 August 2025, it has been in force since 1 March 2026.
Document preview — GB/T 46248-2025
National Standard of the People's Republic of China
- ICS
- 27.160
- Classification
- F 12
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- PrefaceIII
- 1 Scope1
- 2 Normative References1
- 3 Terms and Definitions1
- 4 Measuring instruments2
- 4.1 Temperature Measurement2
- 4.2 Wind speed measurement2
- 4.3 Electrical Power Measurement2
- 4.4 Dimensional Measurement2
- 5 Test Platform2
- 5.1 Test Platform Composition2
- 5.2 Support Frame3
- 5.3 Temperature Control System3
- 5.4 Temperature and Power Testing System4
- 6 Test Conditions4
- 6.1 Ambient temperature4
- 6.2 Ambient wind speed4
- 6.3 Surrounding Environment Requirements4
- 6.4 Temperature uniformity of the inner wall surface of the metal heat absorber tube4
- 6.5 Test Temperature Selection4
- 6.6 Data Acquisition Frequency4
- 6.7 Test cycle5
- 7 Test Preparation5
- 7.1 Sample Pretreatment5
- 7.2 Electric heater installation6
- 7.3 Temperature Sensor Installation6
- 7.4 Installation of heat exchanger pipe6
- 8 Test Steps7
- 8.1 Start the test system7
- 8.2 Setting the Data Acquisition Frequency7
- 8.3 Turn on heating7
- 8.4 Temperature Adjustment7
- 8.5 Test Data Acquisition7
- 9 Calculation of heat loss coefficient 7.7
- 9.1 Average temperature of the inner wall of the metal heat absorber tube7
- 9.2 Average temperature of the outer wall of the glass tube8
- 9.3 Average ambient temperature8
- 9.4 Calculation of Heat Loss Coefficient (HL)8
- 9.5 Fitting Formula for Heat Loss Coefficient8
- 9.6 Values of heat loss coefficient at different temperatures9
- 10 Test Report9
- Appendix A (Informative) Test Report10
- Reference14
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents". Drafting.
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed and is under the jurisdiction of the National Solar Energy Standardization Technical Committee (SAC/TC402).
This document was drafted by: Institute of Electrical Engineering, Chinese Academy of Sciences; China National Institute of Standardization; Changzhou Longteng Photothermal Technology Co., Ltd.
Beijing Tianruixing Photothermal Technology Co., Ltd., Hebei Daorong New Energy Technology Co., Ltd., Lanzhou Dacheng Technology Co., Ltd., China Shipbuilding Industry Corporation Heavy Industry Group New Energy Co., Ltd., Beijing Zhaoyang Thermal Technology Co., Ltd., China Three Gorges Corporation, Central South University, Research Institute of GRINM Engineering Technology Co., Ltd., Himin Solar Energy Co., Ltd., and Institute of Engineering Thermophysics, Chinese Academy of Sciences.
The main drafters of this document are: Lei Dongqiang, Wang Zhifeng, Liu Meng, Yu Ke, Zhang Lei, Xue Daorong, Fan Yulei, Zong Diyuan, Liu Yang, Tang Bojin, and Chang Yong.
Lin Xinxing, Su Wen, Mi Jing, Zhao Jifang, Hao Yong, Lu Zhiheng, Hu Qiao, Du Miao, Xu Li, Gong Bo, Han Chengming, Li Qiang, Yuan Guofeng, Yang Jie.
Test method for heat loss coefficient of parabolic trough solar collector tube
1 Scope
This document specifies the instruments, testing platform, testing conditions, testing preparation, and testing procedures for measuring the heat loss coefficient of parabolic trough solar collectors.
Heat loss coefficient calculation and test report.
This document applies to the steady-state thermal equilibrium method for testing parabolic trough solar thermal power generation systems and trough solar collector systems.
The heat loss coefficient of solar collector tubes, and the solar thermal power generation system and other linear Fresnel solar collector systems.
The heat loss coefficient test for solar collector tubes shall be conducted in accordance with the relevant procedures.
2 Normative references
GB/T 12936
GB/T 26972
3 Terms and Definitions
The terms and definitions defined in GB/T 12936 and GB/T 26972, as well as the following terms and definitions, apply to this document.
3.1 metal absorber tube
A metal tube with a solar selective absorption coating on its outer surface, used to absorb solar radiation and convert it into heat energy of the heat transfer fluid inside the tube.
3.2 [Source. GB/T 26972-2011, 4.40, with modifications]
A vacuum heat collection tube with open ends.
Note. It mainly consists of a glass tube, a metal heat absorption tube, a vacuum jacket, and a buffer component for axial expansion and contraction.
3.3 heat loss coefficient
The heat loss power per unit length of a trough solar collector tube to the environment under a given temperature condition.
Note. The unit is watts per meter (W/m).
3.4 main heater
A rod-type electric heater placed inside a metal heat-absorbing tube as the main heating element.
3.5 auxiliary heater
A disc-shaped electric heater used for auxiliary heating of the ends of trough-type solar collector tubes.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.
Referenced standards
Editions of GB/T 46248
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 46248-2025 | Test method for heat loss coefficient of parabolic trough solar receiver tube | current edition | Current |
This page sells the current edition, GB/T 46248-2025. Earlier editions are listed for reference only.
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