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RESEARCH PAPERS

Multiple Air-Jet Window Cooling for High-Temperature Pressurized Volumetric Receivers: Testing, Evaluation, and Modeling

[+] Author and Article Information
M. Röger, M. Pfänder

Institute of Technical Thermodynamics, German Aerospace Center (DLR), PSA, Apartado 39, E-04200 Tabernas, Spain

R. Buck

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

J. Sol. Energy Eng 128(3), 265-274 (Mar 23, 2006) (10 pages) doi:10.1115/1.2212437 History: Received September 22, 2005; Revised March 23, 2006

High air outlet temperatures increase the solar share of pressurized solar receivers for gas turbines, operated in solar-fossil hybrid mode. However, an increase in outlet temperature over 800°C leads to excessive heating of the receiver window, unless it is actively cooled. This paper describes modeling, testing, and evaluation of a high-temperature receiver with external multiple air-jet window cooling. An asymmetric window-cooling design with pulsating air mass flow rates achieves suitable cooling of the concave fused-silica window. A thermodynamic receiver model, comprising nongray radiative heat transfer, convection, and conduction is the basis of the external window cooling design. In addition to high-temperature testing with window cooling in operation, solar tests at lower temperatures with no window cooling were conducted to verify the thermodynamic receiver model. Temperature distributions on the quartz window and the absorber were determined by an infrared scanner which was specially developed for temperature measurement on the high-temperature module. Comparisons of simulations and measurements show good agreement. With multiple air-jet window cooling, receiver air outlet temperatures over 1000°C could be reached, while window temperatures are kept below 800°C.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Solar air heating system of a combined cycle

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Figure 2

Pressurized volumetric receiver (REFOS type)

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Figure 3

SOLGATE test setup (rear view)

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Figure 4

(a) Thermal balance for surfaces kA and kB of a semi-transparent volume element. (b) Spectral radiant fluxes incident on and outgoing from surfaces kA and kB.

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Figure 5

Experimental pressurized volumetric receiver temperature measurement setup

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Figure 6

(a) Simulated and (b) measured temperatures on the window outside (test number 1, front view)

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Figure 7

Asymmetric cooling scheme and mean transfer on window surface (measurements, slot nozzles, dh=0.016m, Re=65,800(18))

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Figure 8

Preinstalled nozzles on window flange of HT module (front view)

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Figure 9

Heat transfer on window outside and temperature responses of outside (Text) and inside of window (Tint). Simulation (point P with LP=0.22m; Tper=20s).

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Figure 10

(a) Simulated and (b) measured temperatures on the window outside (test number 2, front view)

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Figure 11

Simulated and measured temperature response at a point on the window outside (June 18, 2003, 13:21–13:23h UTC)

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