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Research Papers

Start-Up Modeling for Annual CSP Yield Calculations

[+] Author and Article Information
Tobias Hirsch, Jan Fabian Feldhoff, Heiko Schenk

 German Aerospace Center (DLR), Institute for Solar Research, Pfaffenwaldring 38-40, 70569 Stuttgart, Germanytobias.hirsch@dlr.de

J. Sol. Energy Eng 134(3), 031004 (Apr 04, 2012) (9 pages) doi:10.1115/1.4006268 History: Received August 08, 2011; Revised February 23, 2012; Published April 03, 2012; Online April 04, 2012

In solar thermal power plants, at least the solar part undergoes a daily start-up process. Since duration and energy consumption of the start-up depend on irradiance and temperature boundary conditions, differences occur between the individual days and especially between the seasons. For a good representation in annual electricity yield calculations, the start-up process should be modeled on a daily basis. This paper presents a closed approach for the calculation of start-up and cool-down in solar thermal power plants especially designed for annual calculations. It is demonstrated by one example how the required parameters can be obtained and how the methodology is applied. A sensitivity analysis reveals the large impact of start-up consumption on the annual yield.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Relation between energy state and temperatures at different locations

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Figure 2

General plant layout

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Figure 3

Dynamic simulation model in Modelica/Dymola (plant layer)

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Figure 4

Start-up during a clear-sky day

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Figure 5

Trajectories of simulated start-up processes

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Figure 6

Idealized trajectories of start-up process

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Figure 7

General layout of a symmetric parabolic trough solar field with 152 loops

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Figure 8

Sorted frequency of aperture effective direct normal irradiance for the chosen year in Tabernas, Spain

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Figure 9

Net electricity output relative to simulation without start-up depending on choice of start-up correction factor

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Figure 10

Net electricity output depending on choice of input (nominal simulations based on ψSU  = 1.5 and energies from Table 3)

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