Heat Efficiency of Trough Solar Vacuum Receiver

Abstract:

The heat loss and thermal performance of solar parabolic trough vacuum receiver were experimentally measured and analyzed by heat transfer model. According to the present experiments, the heat loss of solar parabolic trough vacuum receiver has good agreement with the heat loss of vacuum receiver from Solel company. As the wall temperature increase from 108°C to 158°C, the heat loss of solar parabolic trough vacuum receiver remarkably increases from 35 Wm^-2 to 57 Wm^-2. The heat transfer model of parabolic trough solar receiver is then theoretically investigated due to the energy balances between the heat transfer fluid, absorber tube, glass envelope and surroundings. When solar radiation flux is constant, the heat efficiency of solar parabolic trough system decreases with the wall temperature and oil temperature. When solar radiation flux or solar concentration ratio increases, the heat efficiency of solar parabolic trough system increases.

• Periodical: Applied Mechanics and Materials (Volume 521)
• Pages: 23-27
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.521.23
• Online since: February 2014
• Authors: Jun Ming Liang*, Jian Feng Lu, Jing Ding, Jian Ping Yang
• Keywords: Concentration Ratio, Heat Efficiency, Heat Loss, Heat-Conducting Oil, Solar Parabolic Trough Collector, Vacuum Receiver

References

[1] S.A. Kalogirou. Solar thermal collectors and applications. Progress in Energy and Combustion Science, 2004, 30: 231-295.

DOI: 10.1016/j.pecs.2004.02.001

[2] F. Trieb and J. Nitsch. Recommendations for the market introduction of solar thermal power stations. Renewable Energy, 1998, 14: 17-22.

DOI: 10.1016/s0960-1481(98)00041-x

[3] V. P. Ricardo, D. Gokmen, D. Y. Goswami, S. Elias and M. Muhammad. Rahman. Heat transfer analysis of parabolic trough solar receiver. Applied Energy, 2011, 88: 5097-5110.

DOI: 10.1016/j.apenergy.2011.07.012

[4] V. Dudley, G. Kolb, M. Sloan and D. Kearney. SEGS LS2 Solar Collector-Test Results. Report of Sandia National Laboratories. SAN94-1884, (1994).

DOI: 10.2172/70756

[5] A. Ratzel, C. Hickox and D. Gartling. Techniques for reducing thermal conduction and natural convection heat losses in annular receiver geometries. J Heat Trans Trans ASME, 1979, 101: 108-13.

DOI: 10.1115/1.3450899

[6] N. Naeeni and M. Yaghoubi. Analysis of wind flow around a parabolic collector (2) heat transfer from receiver tube. Renewable Energy, 2007, 32: 1259-1272.

DOI: 10.1016/j.renene.2006.06.005

[7] Lu Jianfeng, Ding Jing, Yang Jianping, Yang Xiaoxi. Exergetic optimization for solar heat receiver with heat loss and viscous dissipation. Solar Energy 86 (2012) 2273-2281.

DOI: 10.1016/j.solener.2012.04.017

[8] S.D. Odeh, G.L. Morrison and M. Behnia. Modelling of parabolic trough direct steam generation solar collectors. Solar Energy, 1998, 62: 395–406.

DOI: 10.1016/s0038-092x(98)00031-0

[9] M.D.T. Agustín and G.R. Lourdes. Comparison of solar technologies for driving a desalination system by means of an organic Rankine cycle. Desalination, 216 (2007) 276-291.

DOI: 10.1016/j.desal.2006.12.013

[10] J.H. Lienhard IV and J.H. Lienhard V. A Heat Transfer Textbook. Phlogiston Press, Cambridge, Massachusetts, U.S. A, (2002).

[11] F. Burkholder and C. Kutscher. Heat-Loss Testing of Solel's UVAC3 Parabolic Trough Receiver. Technical Report January 2008, NREL/TP-550-42394.

DOI: 10.2172/922153