Читать книгу Energy Storage - Группа авторов - Страница 18

Linear Fresnel reflector systems use a field of narrow long mirrors. The mirrors are rotated independently to concentrate solar radiation on a stationary receiver tube. The mirrors are either flat or curved that track the sun and focus solar radiation [Figure 1.3]. The fixed absorber tube allows for easier Direct Steam Generation (DSG). Due to direct DSG, the operating temperature for such systems can be larger. This system also works with line focusing concept.

Figure 1.4 CSP receiver concepts as used worldwide.

One of the major advantages of such systems is the simple design of the reflector leading to lesser capital cost. Overall, Linear Fresnel CSP receiver system offers lowest start-up and maintenance cost. In addition, cheap and simple flat mirrors allow high reflectors density per square meter. However, linear Fresnel receivers have the lowest solar-to-electrical efficiency compared to other receivers due to high optical loss. Now 9% of all CSP plants opt for such collector concept [Figure 1.4]. As observed from the literature, there is a good amount of fundamental and academic research work going on to enhance the performance of the CSP system with linear Fresnel receiver (Desai and Bandyopadhyay, 2015; Mills et al., 2000; Morin et al., 2012; Xie et al., 2011).