T/CRES 0001-2018 Active Group standards

T/CRES 0001-2018 Testing method for heat loss coefficient of parabolic trough solar collector tube

Publish Date: 2018-10-08 Implement Date: 2018-10-08 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/CRES 0001-2018

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Energy

ICS Name: Solar energy engineering

Publish Date: 2018-10-08

Implement Date: 2018-10-08

Scope

Scope: This standard specifies the principles, instruments, test procedures, data processing, and test report format for testing the heat loss coefficient of parabolic trough solar collector tubes used in thermal power generation systems with a heat transfer fluid temperature exceeding 250°C, using the steady-state heat balance method. This standard applies to parabolic trough solar collector tubes used in solar thermal power generation systems. Other solar collector tubes with a glass-metal inner tube structure can be referenced for implementation. Main technical content: 3. Terms and definitions The terms and definitions established in GB/T 12936 and GB/T 26972 apply to this document. 3.1 Solar selective absorbing coating A coating with high solar absorption ratio and low infrared emission ratio. 3.2 Absorber tube A metal tube with a solar selective absorbing coating on its outer surface, used to absorb solar radiation and convert it into thermal energy for the fluid inside the tube. 3.3 Test period The time period during which a steady state is maintained at each measured temperature point. 3.4 Heat loss coefficient The heat loss power value per unit length of a parabolic trough solar collector tube under a given temperature condition. Note: The unit is W/m. 3.5 Main heater A rod-type electric heater placed inside the absorber tube. 3.6 Assistant heater An electric heater used to heat the end of the collector tube. 3.7 Even temperature pipe A metal tube with high thermal conductivity placed inside the collector tube. 4. Principle The absorber tube in the parabolic trough solar collector tube is heated by electric heating to a set temperature difference from the ambient air temperature. After the wall temperature of the absorber tube stabilizes, the input power of the electric heater required to maintain this temperature difference is the heat loss power of the parabolic trough solar collector tube under this temperature dif