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Thermal Performance Testing

On-site Qualification of Collectors / Collector Fields

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A Mobile Field Laboratory equipped with sensors for on-site measurement of thermal performance is used for the characterization of solar thermal collectors and fields under actual operation conditions.
Due to reduced mounting efforts and minimum interference with plant operation compared to the use of build-in sensors it allows flexible, traceable and independent performance measurement and assessment.

Components:

1. Clamp-on sensors for temperature, flow rate and inclination measurements
2. Mobile meteo and irradiance station
3. Data acquisition system

Deliverables:
Evaluation of collector field performance (depending on site and plant operation)

• Efficiency of collector / rows / loops
• Incident angle modifier
• Thermal losses
• Continuous high precision for performance testing (Pyrheliometers, accuracy aimed at ±1%)
• Low maintenance irradiance measurements with good reliability and reasonable accuracy for site evaluation (Rotating Shadowband Pyrheliometers), sensor calibration
• Annual performance estimates

Collector test benches

SOPRAN – test bench for parabolic trough collectors (Köln, Germany)

• Balance of plant for stationary collector testing at temperatures between 30°C and 200°C with pressurized water
• Flow rates of up to 2 kg/s
• Highly accurate temperature, mass flow and DNI measurements (total accuracy ±3%)
• Constant inlet temperatures (±0.1 K) during testing

Additional features: Direct solar steam can be generated up to 15 bar. Up to 60 kW of steam can be supplied to consumers as absorption chillers or steam engines

KONTAS – rotary test bench for parabolic trough collectors (PSA, Spain)

• Two axis tracking for user-defined operating conditions
• Collector length up to 20 m
• Thermal oil as heat transfer medium
• Testing conditions: Oil flow rates of up to 6 kg/s, inlet temperatures up to 400°C, pressures up to 25 bar, wind speed up to 15 m/s
• High accuracy measurement instrumentation, uncertainty aimed at 2-3%
• System and single component testing possible

Deliverables:
Test report with complete thermal and optical characterization of components and entire collector:

• Measurement of thermal and optical performance
• Evaluation of efficiency and incident angle modifier function