The dynamic behavior of a parabolic trough collector field with direct steam generation under varying solar conditions is analyzed using a transient simulation model. It is found that the peak water flow rates observed during transients may reach several times the steady-state design values. Taking into account these results, a method is developed for calculating the required separation efficiency of the water-steam separator between evaporating and superheating sections of the solar field. For a field with individual phase separators arranged in each collector row, the drainage system, used for transporting the separated water from the field to a central buffer tank, is dimensionally defined. It turns out that a buffer capacity of about and a large-diameter drainage line have to be foreseen in order to cope with the high liquid loads under solar transients. The results are compared to a field layout with one central separation drum in terms of materials consumption and thermal inertia. It turns out that the originally intended effect of a reduced thermal inertia is not reached when transient conditions are taken care of in the design of the components.
Design of a Phase Separation System for a Direct Steam Generation Parabolic Trough Collector Field
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Hirsch, T., and Eck, M. (December 28, 2007). "Design of a Phase Separation System for a Direct Steam Generation Parabolic Trough Collector Field." ASME. J. Sol. Energy Eng. February 2008; 130(1): 011003. https://doi.org/10.1115/1.2804621
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