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471-2004-1-Concentrating collector-Serkan Kapucu

Troughs parabolic trough combined with gas turbines

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Unformatted text preview: as turbines [3]. troughs Parabolic trough combined with gas turbines is shown Parabolic figure 3.1.5 below. figure Figure 3.1.5 Parabolic trough combined with gas turbines [4]. Cost projections for trough technology are higher than those for power towers and dish/engine systems due in large part to the lower solar concentration and hence lower temperatures and efficiency.However with long operating experience, continued technology improvements, and operating and maintenance cost reductions, troughs are the least expensive, most reliable solar thermal power production technology for near-term [4]. near-term 3.2. Parabolic dish systems A parabolic dish collector is similar in appearance to a large satellite dish, but has mirror-like reflectors and an absorber at the focal point. It uses a dual axis sun tracker [3]. The below figure 3.2.1 shows The crossection of parabolic dish. crossection Figure 3.2.1 Crossection of parabolic dish [4]. The Parabolic dish collector is The shown in the below figure 3.2.2. shown Figure 3.2.2 Parabolic dish collector with a mirrorlike reflectors and an absorber at the focal point [Courtesy of SunLabs - Department of Energy] [3]. A parabolic dish system uses a computer to track the sun and concentrate the sun's rays onto a receiver located at the focal point in front of the dish. In some systems, a heat engine, such as a Stirling engine, is linked to the receiver to generate electricity. Parabolic dish systems can reach 1000 °C at the receiver, and achieve the highest efficiencies for converting solar energy to electricity in the small-power capacity range [3]. capacity The right figure 3.2.3 The shows the solar dish stirling engine. stirling Figure 3.2.3 Solar dish stirling engine [9]. Engines currently under consideration include Stirling and Brayton cycle engines. Several prototype dish/engine systems, ranging in size from 7 to 25 kW have been deployed in various locations in the USA. High optical efficiency and low start up losses make dish/engine systems the most efficient of all solar techno...
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