Modelling and Design of Direct Solar Steam Generating Collector Fields

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

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

J. Sol. Energy Eng 127(3), 371-380 (Jul 20, 2005) (10 pages) doi:10.1115/1.1849225 History: Received April 27, 2004; Revised August 10, 2004; Online July 20, 2005
Copyright © 2005 by ASME
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Main flow patterns for direct steam generation
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Schematic cross section of an evaporation tube
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March of the specific pressure loss along the collector loop (di=50 mm,M=1 kg/s)
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Heat transfer coefficient as a function of the spec. enthalpy for different heat flux densities. In two-phase region only the heat transfer coefficient in the wetted and heated region is displayed. (p=100 bar,Ṁ=1 kg/s,di=50 mm)
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Heat transfer coefficient as a function of the spec. Enthalpy for different pressures. In the two-phase region only the heat transfer coefficient in the wetted and heated region is displayed. (q̇=40 kW/m2,Ṁ=1 kg/s,d=50 mm)
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Collector efficiency as a function of the difference between operation and ambient temperature (T−Ta) for different values of the DNI (φ=0 deg, Cermet with Vacuum, LS-2 collector)
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Typical heat flux distribution along the outer surface of an absorber tube and its approximation by a gaussian and a rectangular distribution with σ=60 deg
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Schematic illustration of an absorber cross section with the four different sections
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Developed view of an absorber tube segment for the derivation of the analytical solution. The depth of the Segment is Δz.
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Comparison of the temperature along the medium center line of the absorber cross section calculated with the FEM package ANSYS® and the analytical solution. (two-phase-flow, heated from the side)
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Pressure along the collector loop for the different operation modes (p=100 bar,Tout=400°C,di=50 mm, DNI=800 W/m2 )
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Difference between highest and lowest temperature in the cross section along the collector loop for the different operation modes (p=100 bar,Tout=400°C,di=50 mm, DNI=800 W/m2 )
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Calculated march of the pressure along the collector length for different inner diameters
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IPSEPro Simulation of one half of a 5 MW DSG collector field
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Simulated temperature difference between the medium center line and the fluid temperature
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Simulated temperature field in an absorber cross section of the superheating section using the FEM package ANSYS®
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Absolute value of the maximum Stress in the absorber tube due to a pure pressure load, a pure thermal load and a combined pressure and thermal load
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Long time rupture strength of possible absorber materials 21
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Stability curve of the evaporation section for different inlet temperatures




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