In the solar thermal tower power generation system, the measurement of concentrated flux distribution on the receiver aperture is of great significance for optimizing the solar thermal performance of the whole system. In this paper, an indirect measurement method was proposed based on moonlight concentration for the concentrated solar flux distribution of the heliostat field of a tower power plant. Two moonlight concentrating experiments carried out at Yanqing Solar Tower Power Plant in Beijing in the night of September 24, 2018, were introduced: one was to obtain the illuminance distribution of the concentrated lunar image taken by a CCD camera and calibrated through the illuminometers arranged on the tower; another was to obtain the illuminance distribution of the concentrated image by moving the image through the fixed illuminometers and then reconstructing the lunar image from the measured illuminance values at different times by Gaussian fitting. And then the relative illuminance distribution of the concentrated lunar image on the tower was obtained by comparing the illumination distribution with the direct normal illumination of the moonlight measured by the moonlight measuring station. The moonlight concentrating experiments showed that the relative flux distribution (ie, the concentration ratio distribution) of the concentrated lunar image of the tower power plant can be obtained, which provided experimental data support for the subsequent conversion to the solar flux distribution according to the brightness distribution relationship between the sun and the moon.
WANG Nan
,
WANG Xin-yu
,
SUN Fei-hu
,
GUO Ming-huan
. Experimental Study of Moonlight Concentration of a Solar Tower Power Plant in the Full Moon Night[J]. Advances in New and Renewable Energy, 2019
, 7(1)
: 23
-31
.
DOI: 10.3969/j.issn.2095-560X.2019.01.003
[1] BALLESTRIN J. A non-water-cooled heat flux measurement system under concentrated solar radiation conditions[J]. Solar energy, 2002, 73(3): 159-168. DOI: 10.1016/S0038-092X(02)00046-4.
[2] OSUNA R, MORILLO R, JIMÉNEZ J M, et al. Control and operation strategies in PS10 tower plant[C]//Proceedings of the 13th Solar PACES, Seville, Spain: Solar PACES, 2006.
[3] BALLESTRÍN J, MONTERREAL R. Hybrid heat flux measurement system for solar central receiver evaluation[J]. Energy, 2004, 29(5/6):915-924. DOI: 10.1016/S0360- 5442(03)00196-8.
[4] GÖHRING F, BENDER O, RÖGER M, et al. Flux density measurement on open volumetric receivers[C]// Proceedings of the SolarPACES 2011. Granada, Spain: Solar PACES, 2011.
[5] NEUMANN A, HOUSER R, PACHECO J. Concepts to measure flux and temperature for external central receivers[C]//Proceedings of the Joint Solar Engineering Conference. San Francisco: ASME, 1994: 595-603.
[6] HO C K, KHALSA S S. A flux mapping method for central receiver systems[C]//Proceedings of the ASME 2011 5th International Conference on Energy Sustainability. Washington, DC, USA: ASME, 2011: 743-751.
[7] HO C K, KHALSA S S. A photographic flux mapping method for concentrating solar collectors and receivers[J]. Journal of solar energy engineering, 2012; 134(4): 041004. DOI: 10.1115/1.4006892.
[8] HO C K, KHALSA S S, GILL D D, et al. Evaluation of a new tool for heliostat field flux mapping[C]//Proceedings of the SolarPACES 2011. Granada, Spain: SolarPACES, 2011.
[9] NAOR G, GOLDWINE G, HAYUT R, et al. Flux measurement system using IR camera[C]//Proceedings of the SolarPACES 2010. Perpignan, France: SolarPACES, 2010.
[10] BLANCO M. ALARC?N D. Enertracer: A new computer tool for energy concentrating systems[C]//Proceedings of the Solar Thermal 2000 Renewable Energy for the New Millennium Conference. Sydney, Australia: STE, 2000: 87-93. GUESDON C, ALXNEIT I, TSCHUDI H R, et al. PSI’s 1 kW imaging furnace—A tool for high-temperature chemical reactivity studies[J]. Solar energy, 2006, 80(10): 1344-1348. DOI: 10.1016/j.solener.2005.04.028.
[11] HISADA T, MII H, NOGUCHI C, et al. Concentration of the solar radiation in a solar furnace[J]. Solar energy, 1957, 1(4): 14-16. DOI: 10.1016/0038-092X(57)90166-4.
[12] HOLMES J T. Heliostat operation at the central receiver test facility, 1978-1980[J]. Journal of solar energy engineering, 1982, 104(3): 133-138. DOI: 10.1115/1.3266293.
[13] SALOMÉ A, CHHEL F, FLAMANT G, et al. Control of the flux distribution on a solar tower receiver using an optimized aiming point strategy: application to THEMIS solar tower[J]. Solar energy, 2013, 94: 352-366.
