Standard No.:	GB/T 46248-2025
English Name:	Test method for heat loss coefficient of parabolic trough solar receiver tube
Chinese Name:	槽式太阳能集热管热损系数测试方法
Chinese Classification:	F12    Solar energy
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2025-8-29
Implemented on:	2026-3-1
Status:	to be valid
Target Language:	English
File Format:	PDF
Word Count:	12500 words
Translation Price(USD):	375.0
Delivery:	via email in 1~5 business day

GB/T 46248-2025 Test method for heat loss coefficient of parabolic trough solar receiver tube English, Anglais, Englisch, Inglés, えいご This is a draft translation for reference among interesting stakeholders. The finalized translation (passing thorugh draft translation, self-check, revision and varification) will be delivered upon being ordered. ICS 27. 160 CCS F 12 National Standard of the People's Republic of China GB/T 46248-2025 Test method for thermal loss coefficient of trough solar collector tubes Testmethod forheatlosscoefficientofparabolictrough solarreceivertube Issued on 2025-08-29 Implemented on 2026-03-01 Issued by State Administration for Market Regulation, Standardization Administration of China Contents Preface 1 Scope 2 Normative References 3 Terms and definitions 4 Measuring instruments 4.1 Temperature measurement 4.2 Wind speed measurement 4.3 Electric power measurement 4.4 Dimensional measurement 5 Testing Platforms 5.1 Composition of Testing Platform 5.2 Support frame 5.3 Temperature control system 5.4 Temperature and Power Testing System 6 Test conditions 6.1 Environmental temperature 6.2 Environmental wind speed 6.3 Requirements for Surrounding Environment 6.4 Uniformity of temperature on the inner wall of metal heat absorbing tubes 6.5 Temperature Selection for Testing 6.6 Data collection frequency 6-7 testing cycle 7 Test Preparation 7.1 Sample Preparation 7.2 Installation of electric heater 7.3 Temperature sensor installation 7.4 Installation of temperature equalizing pipe 8 Test steps 8.1 Activate the testing system 8.2 Set data collection frequency 8.3 Turn on heating 8.4 Temperature regulation 8.5 Test data collection 9 Calculation of heat loss coefficient 9.1 Average temperature of inner wall of metal heat absorbing tube 9.2 Average temperature of outer wall of glass tube 9.3 Average Environmental Temperature 9.4 Calculation of Heat Loss Coefficient (HL) 9.5 Heat loss coefficient fitting formula 9.6 Value of heat loss coefficient at different temperatures 10 Test Report Appendix A (Informative) Test Report References Test Method for Heat Loss Coefficient of Parabolic Trough Solar Receiver Tube 1 Scope This document specifies the measurement instruments, test platforms, testing conditions, preparation procedures, testing steps, heat loss coefficient calculation methods, and inspection reports for parabolic trough solar receiver tubes. 2 Normative References GB/T 12936 Terminology for Solar Thermal Utilization GB/T 26972 Terminology for Concentrating Solar Thermal Power 3 Terms and Definitions 3.1 Metal Absorber Tube A metal tube with solar-selective coating, converting solar radiation into thermal energy for heat transfer fluid. 3.2 Parabolic Trough Solar Receiver Tube A double-ended vacuum tube with glass outer tube, metal absorber tube, and buffer components. 3.3 Heat Loss Coefficient (HL) Thermal power dissipated per unit length (W/m) under specified conditions. 4 Measurement Instruments 4.1 Temperature Measurement Sensors for metal absorber tube: ≤±1℃ (≤300℃), ≤±0.4% (>300℃). Ambient/glass tube sensors: ≤±1℃. 4.2 Wind Speed Measurement Anemometer error: ≤±0.5 m/s.