Bader, Roman and Barbato, Maurizio and Pedretti, Andrea and Steinfeld, Aldo (2010) An air-based cavity-receiver for solar trough concentrators. Journal of Solar Energy Engineering, 132. pp. 1-7. ISSN 0199-6231
Full text not available from this repository. (Request a copy)Abstract
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 volume 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°C 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 0.23–11.84 mbars, resulting in isentropic pumping power requirements of 6.45×10−4−0.395% of the solar power input.
| Item Type: | Scientific journal article, Newspaper article or Magazine article |
|---|---|
| Additional Information: | cited By (since 1996)0 |
| Uncontrolled Keywords: | Flow (Dynamics) , Temperature , Heat transfer , Absorption , Convection , Solar energy , Cavities , Radiation (Physics) , Reflection , Solar radiation |
| Subjects: | Thechnologies > Others in technology > Energy technologies |
| Department/unit: | Dipartimento tecnologie innovative > Istituto di ingegneria meccanica e tecnologia dei materiali |
| Depositing User: | Maurizio Barbato |
| Date Deposited: | 28 Jan 2015 06:33 |
| Last Modified: | 06 Jun 2016 08:15 |
| URI: | http://repository.supsi.ch/id/eprint/4871 |
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