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TECHNICAL PAPERS

Direct Steam Generation in Parabolic Troughs: First Results of the DISS Project

[+] Author and Article Information
M. Eck, W.-D. Steinmann

German Aerospace Center (DLR), Institute of Technical Thermodynamics, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany

J. Sol. Energy Eng 124(2), 134-139 (Apr 24, 2002) (6 pages) doi:10.1115/1.1464125 History: Revised November 01, 2000; Received May 01, 2001; Online April 24, 2002
Copyright © 2002 by ASME
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References

Zarza, E., and Hennecke, K., 2000, “Direct Solar Steam Generation in Parabolic Troughs (DISS)—The first Year of Operation of the DISS Test Facility at the Plataforma Solar de Almeria,” Proc. of 10th SolarPACES Int. Symp. on Solar Thermal Concentrating Technologies, Sydney, pp. 65–70.
Steinmann, W.-D., and Goebel, O., 1998, “Investigation of the Stationary and Transient Characteristics of Parabolic Trough Collectors for Direct Steam Generation,” Proc. of Int. Solar Energy Conf., Albuquerque, pp. 409–416.
Odeh,  S. D., Morrison,  L., and Behnia,  M., 1998, “Modeling of Parabolic Trough Direct Steam Generation Solar Collectors,” Sol. Energy, 62(6), pp. 395–406.
Thom,  J. R. S., 1964, “Prediction of Pressure Drop during Forced Circulation Boiling of Water,” Int. J. Heat Mass Transf., 7, pp. 709–724.
Eck, M., and Steinmann, W.-D., 2000, “Dynamic Behavior of the Direct Solar Steam Generation in Parabolic Trough Collectors: A Simulation Study,” Proc. of 10th SolarPACES Int. Symp. on Solar Thermal Concentrating Technologies, Sydney, pp. 101–106.
Steinmann, W.-D., and Eck, M., 2000, “Direct Solar Steam Generation in Parabolic Troughs: Thermal Stress due to Variations in Irradiation,” Proc. of 10th SolarPACES Int. Symp. on Solar Thermal Concentrating Technologies, Sydney, pp. 107–112.
DISS, 1999, First 12-Monthly Progress Report—DISS-MQ-QA-35, Report of the Plataforma Solar de Almeria, Spain.
Eck,  M., and Geskes,  P., 1999, “Experimental Investigations on the Dynamic Fluid Behaviour in Horizontal Absorber Tubes with Direct Solar Steam Generation,” J. Phys. IV, 9, pp. 129–134.
Almanza,  R., Lentz,  A., Santiago,  L., and Valdes,  A., 1999, “Some Experiences on Electricity Production at low Powers with DSG using Parabolic Troughs,” J. Phys. IV, 9, pp. 229–232.
Lippke,  F., 1996, “Direct Steam Generation in Parabolic Trough Solar Power Plants: Numerical Investigation of the Transients and the Control of a Once-Through System,” ASME J. Sol. Energy Eng., 118, pp. 9–14.
ASA, 2000, http://www.asa-germany.de/asa/separator/separat.html
Azzopardi,  B. J., and Hervieu,  E., 1994, “Phase Separation at T-Junctions,” Multiphase Sci. Technol., 8, pp. 645–714.
STEAG Ed., 1988, Strom aus Steinkohle (in German), Springer, Berlin, Heidelberg, New York.
BEI (British Electricity International) Ed., 1991, Modern Power Station Practice, 3rd Edition, Vol. C: Turbines, Generators, and Associated Plant, Pergamon Press, Oxford, New York, Seoul, Tokyo.

Figures

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Basic concepts considered for solar steam generation in parabolic troughs
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Photo of the DISS test facility
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Temperature and pressure of the fluid at the outlet of the collector loop measured on the 4th of July 2000; Operation in recirculation mode
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Measured and simulated maximum temperature gradient along the collector loop for a test in recirculation mode at solar noon (p=30 bar,R=1)
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Measured maximum temperature gradient profile for tests in recirculation mode for different recirculation rates (p=30 bar)
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Measured and simulated (−) pressure profile along the collector loop for different recirculation rates and a steam mass flux of 0.4 kg/s (p=30 bar)
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Measured steam temperature at the collector outlet and the maximum temperature gradient in the cross section at the position of 404 m for a test in once-through mode (p=30 bar)
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Measured and simulated steam temperature after a temporary shading of the 10th and 11th collector for a test in recirculation mode (p=30 bar)
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Measured fluid temperatures after a temporary shading of the 1st collector for a test in recirculation mode (p=30 bar)
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Measured steam mass flux and the position of collector 1 (0=defocused) for the test of Fig. 8
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Measured fluid temperatures after a temporary shading of the 1st collector for a test in once-through mode (p=30 bar)
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Measured steam mass flux at the collector loop outlet and the position of collector 1 (0=defocused) for the test of Fig. 11
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Schematic design of a cyclone separator (in the style of 117)
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Schematic design of one collector loop with a T-junction as a phase separator

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