Journal article
An Air-Based Cavity-Receiver for Solar Trough Concentrators
- Bader, Roman ETH Zurich, Zurich, Switzerland
- Barbato, Maurizio SUPSI, Manno, Switzerland
- Pedretti, Andrea Airlight Energy Holding SA, Biasca, Switzerland
- Steinfeld, Aldo ETH Zurich, Zurich; Paul Scherrer Institute, Villigen PSI, Switzerland
- 2010-12-22
Published in:
- ASME 2010 4th International Conference on Energy Sustainability, Volume 2. - ASMEDC. - 2010
English
A cylindrical cavity-receiver containing a tubular absorber that uses air as the heat transfer fluid is proposed for a novel solar trough concentrator design. A numerical heat transfer model is developed to determine the receiver’s absorption efficiency and pumping power requirement. The 2D steady-state energy conservation equation coupling radiation, convection and conduction heat transfer is formulated and solved numerically by finite-difference techniques. The Monte Carlo ray-tracing and radiosity methods are applied to establish the solar radiation distribution and radiative exchange within the receiver. Simulations were conducted for a 50 m-long and 9.5 m-wide collector section with 120°C air inlet temperature, and air mass flows in the range 0.1–1.2 kg/s. Outlet air temperatures ranged from 260 to 601 °C, and corresponding absorption efficiencies varied between 60 and 18%. Main heat losses integrated over the receiver length were due to reflection and spillage at the receiver’s windowed aperture, amounting to 13% and 9% of the solar power input, respectively. The pressure drop along the 50 m module was in the range 0.23 to 11.84 mbar, resulting in isentropic pumping power requirements of 6.45·10−4%–0.395% of the solar power input.
- Language
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- English
- Open access status
- closed
- Identifiers
- Persistent URL
- https://sonar.ch/global/documents/234365
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