Direct steam generation (DSG) in parabolic troughs was first studied in the early 1980s by Murphy (1982) and Pederson (1982). Intensive research on DSG then started in 1988, when Luz identified this technology as the desired system for a future generation of its power plants. These R&D activities were not terminated on Luz’s demise in 1991, but have been continued by several institutes and companies in Europe as well as in Israel (Dagan et al., 1991, Mu¨ller et al., 1992a, b, 1993, 1994). This paper concerns the dynamic reaction of the water-steam flow. In order to investigate this, a numerical simulation program was developed at the ZSW. The numerical approach, its verification, and results of an extended study concerning the reaction and the control (ability) of a once-through DSG system at different weather conditions are presented.

Cohen, G., and Kearney, D., 1994, “Improved Parabolic Trough Solar Electric Systems Based on the SEGS Experience,” Solar 94, American Solar Energy Society, San Jose, CA.
Dagan, E., Mu¨ller, M., and Lippke, F., 1991, “Direct Solar Steam Generation in Parabolic Trough Collectors,” PSA-Report, Almeria.
Gindele, K. J, 1988, “Die strahlungsphysikalischen Eigen schaften selektiver Solarabsorberschichten,” University of Stuttgart, Institut fu¨r Theorie der Elektrotechnik.
Gnielinski, V., 1975, “Neue Gleichungen fu¨r den Wa¨rme- und Stoffu¨bergang in turbulent durchstro¨mten Rohren und Kana¨ler,” Forschungs-Ingenieurwesen, Bd. 41.
Kastner, W., Kefer, V., Ko¨hler, W., and Kra¨tzer, W., 1988, “Wa¨rmeu¨bergang und Druckverlust in einseitig beheizten, geneigten und innenberippten Rohren,” Forschungsprogramm Energietechnik, Schlußbericht, BMFT-03E-6361-A.
Lippke, F., 1994a, “Numerische Simulation der Absorber dynamik von Parabolrinnen-Solarkraftwerken mit direkter Dampferzeugung,” V DI-Fortschritt-Berichte, Reihe 6, Nr. 307.
Lippke, F. 1994b, “Numerical Analysis of the Influence of Uneven Insolation Distribution on Mass Flow Rates and Temperatures in the Absorber Tubes of the PSA Diss Test Loop,” Annex B in the report of the working group on Predesign of a PSA-Based Test Loop for Direct Steam Generation, PSA.
Mu¨ller, M., and Lippke, F., 1992a, “Lab-scale High-Pressure Water/Steam Test Loop for Research in Two-Phase Flow Phenomena in Parabolic Trough Power Plants with Direct Steam Generation: Thermodynamics and First Operational Results,” Proceedings, 6th International Symposium on Solar Thermal Concentrating Technologies, Mojacar, Spain.
Mu¨ller, M., Lippke, F., Ratzesberger, R., and Rheinla¨nder, J., 1992b, “Kreisprozeßschaltungen fu¨r parabolrinnen-Solarkraft werke mit direkter Dampferzeugung im Solarfeld,” BWK 44.
Mu¨ller, M., Lippke, F., and Ratzesberger, R., 1993, “Direct Steam Generation in Parabolic-Trough Solar Power Plants: A Re´sume´ on Issues Learned and an Outlook on the Next Steps,” Proceedings, ISES Solar World Congress, Budapest, Hungary.
Mu¨ller, M., 1995, “Pre-design of a PSA-based test facility,” PSA, to be published.
Murphy, L. M., and May, E. K., 1982, “Steam Generation in Line-Focus Solar Collectors: A Comparative Assessment of Thermal Performance, Operating Stability and Cost Issues,” SERI-Report No. TR-632-1331.
Pederson, R. J., and May, E. K., 1982, “Flow Instabilities During Steam Generation in a Line-Focus Solar Collector System,” SERI-Report No. TR-632-1354
Randall, C. M., Johnson, B. R., and Whitson, M. E. Jr., 1980, “Measurements of Typical Insolation Variation at Daggett, California, Vol. 1 and 2.” Aerospace Report N. ATR-80(7747)–1.
VDI, 1991, “VDI-Wa¨rmeatlas,” VDI-Verlag, 6, Auflage, Du¨sseldorf, Germany.
Yadigaroglu, G., Hewitt, G. F., Hetsroni, G., and Banerjee, S., 1991, “Short Courses in Multiphase Flow and Heat Transfer,” Lecture Material, ETH Zu¨rich.
This content is only available via PDF.
You do not currently have access to this content.