An air-based cavity-receiver for solar trough concentrators

Bader, Roman and Barbato, Maurizio and Pedretti, Andrea and Steinfeld, Aldo (2010) An air-based cavity-receiver for solar trough concentrators. In: ASME 2010 4th International Conference on Energy Sustainability, ES 2010 ASME 2010 4th International Conference on Energy Sustainability, ES 2010; , 17 May 2010 through 22 May 2010, Phoenix, AZ; United States; .

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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.

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