Solar-Assisted Small Solar Tower Trigeneration Systems

[+] Author and Article Information
R. Buck, S. Friedmann

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

Annual solar thermal energy at the receiver exit divided by solar design thermal power at the receiver exit.

J. Sol. Energy Eng 129(4), 349-354 (Mar 27, 2007) (6 pages) doi:10.1115/1.2769688 History: Received July 25, 2006; Revised March 27, 2007

Solar-hybrid gas turbine power systems offer a high potential for cost reduction of solar power. Such systems were already demonstrated as test systems. For the market introduction of this technology, microturbines in combination with small solar tower plants are a promising option. The combination of a solarized microturbine with an absorption chiller was studied; the results are presented in this paper. The solar-hybrid trigeneration system consists of a small heliostat field, a receiver unit installed on a tower, a modified microturbine, and an absorption chiller. The components are described, as well as the required modifications for integration to the complete system. Several absorption chiller models were reviewed. System configurations were assessed for technical performance and cost. For a representative site, a system layout was made, using selected industrial components. The annual energy yield in power, cooling, and heat was determined. A cost assessment was made to obtain the cost of electricity and cooling power, and eventually additional heat. Various load situations for electric and cooling power were analyzed. The results indicate promising niche applications for the solar-assisted trigeneration of power, heat, and cooling. The potential for improvements in the system configuration and the components is discussed, also the next steps toward market introduction of such systems.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Solar microtower plant

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Figure 2

Heliostat field layout (colors indicate efficiency)

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Figure 3

p,T diagrams of a single effect absorption chiller

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Figure 4

Layout of solarized TURBEC T100 with BROAD BE25

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Figure 5

Composition of the total efficiencies (design conditions)

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Figure 6

Required solar electricity payment for cost recovery

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Figure 7

Solarized TURBEC T100 and YAZAKI SC30 at 4000 operating h/yr (white dot: profit=−16,200€)

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Figure 8

Solarized TURBEC T100 and BROAD BE25 at 4000 operating h/yr (white dot: profit=−2300€)

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Figure 9

Solarized TURBEC T100 and YAZAKI SC30 at 8000 operating h/yr (white dot: profit=+6000€)

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Figure 10

Solarized TURBEC T100 and BROAD BE25 at 8000 operating h/yr (white dot: profit=+19,900€)

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Figure 11

Required electricity payment for cost recovery



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