10 depicts the flux intensity for a LFC with multitube receiver in Almería. The flux intensity achieved at the receiver has a deep impact on the thermal efficiency achieved by such element (Abbas et al., 2012). Therefore, the cosine factor losses are minimum for those mirrors A comparison of flux intensity on the receiver The simulation is carried out at noon, local time, which means that the sun is still at the Eastern side of the field – solar culmination is around 2 pm. It has been said that the three dimensional model is able to obtain the energy effectiveness and loss sources for each individual mirror. However, linear collector lengths are normally some order of magnitude larger than their widths, A comparison of energy effectiveness and lossesįirst, the energy effectiveness of the different technologies is compared. The former is required to analyze end losses, and it has been designed so that the effectiveness of each individual mirror is obtained. Two categories of codes have been developed: three dimensional and two dimensional. Among all renewable power generation technologies Developed codes and validation In addition, renewable energy leads to some benefits, which are classified into three categories (Kalogirou, 2004): energy savings, generation of net working posts and decrease of both environmental pollution and limitation of climate change effects. Section snippets Linear technologies in concentrating solar powerĪt current time there is no doubt about the need to maximize the renewable portion of the electricity mix, both due to energy demand growth and fossil fuels depletion (Reddy et al., 2013). Also, it is concluded that, while for PTCs NS orientation leads to clearly higher efficiencies, this is not the case for LFCs, where both orientations achieve similar efficiencies even when the solar field has been designed for NS orientation. It results that the maximum efficiency is obtained by PTCs, while the lowest one corresponds to LFCs with multitube receiver. The optical annual energy and exergy efficiencies are also obtained for PTCs and LFCs, with multitube or secondary reflector receiver, where the concentration at each tube is used to weigh the exergy efficiency. In the present work a developed Monte Carlo Ray Trace code is used in order to compare the energy effectiveness and flux intensity map at the receiver for different days of the year and different orientations in Almería, Spain, and in Aswan, Egypt. Within Fresnel technology, two possibilities appear for the receiver: multitube receiver and secondary reflector receiver. However, linear Fresnel collectors (LFCs) have been identified by many authors as a candidate to reduce the levelized cost of electricity, although with lower efficiencies. Parabolic trough collectors (PTCs) are still today the most mature technology in concentrating solar power.
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