471-2004-1-Concentrating collector-Serkan Kapucu

The concentrators must move to track the sun if they

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Unformatted text preview: Celsius. The concentrators must move to track the sun if they are to perform effectively [1]. to 2. Concentrating collectors collectors Concentrating, or focusing, collectors intercept direct Concentrating, radiation over a large area and focus it onto a small absorber area. These collectors can provide high temperatures more efficiently than flat-plate collectors, since the absorption surface area is much smaller. However, diffused sky radiation cannot be focused onto the absorber. Most concentrating collectors require mechanical equipment that constantly orients the collectors toward the sun and keeps the absorber at the point of focus. Therefore; there keeps are many types of concentrating collectors [2]. are 3. Types of concentrating collectors collectors There are four basic types of concentrating collectors: Parabolic trough system Parabolic dish Parabolic Power tower Power Stationary concentrating collectors Stationary 3.1. Parabolic trough system system Parabolic troughs are devices that are shaped like the letter “u”. The troughs concentrate sunlight onto a letter receiver tube that is positioned along the focal line of the trough. Sometimes a transparent glass tube envelops the receiver tube to reduce heat loss [3]. receiver Their shapes are like letter “u” heir “u” as shown figure 3.1.1 below. as Figure 3.1.1 Crossection of parabolic trough [4]. The parabolic trough sytem is shown in the figure 3.1.2 below. shown Figure 3.1.2 Parabolic trough system [3]. Parabolic troughs often use single-axis or dual-axis tracking. tracking The below figure 3.1.3 shows one axis tracking parabolic trough with axis oriented E-W. oriented Figure 3.1.3 One Axis Tracking Parabolic Trough with Axis Oriented E-W [8]. The below figure 3.1.4 shows two The axis tracking concentrator. axis Figure 3.1.4 Two Axis Tracking Concentrator [8]. Axis Temperatures at the receiver can reach 400 °C and produce steam for generating electricity. In California, multi-megawatt power plants were built using parabolic troughs combined with g...
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