Abstract: The global energy demand is going to increase by over 60% in the upcoming decades. Thus, the alternative form of energy should be investigated. The only energy preferable will be a renewable form of energy which includes wind, solar, biomass, and waste generated through human activities. The most useful alternative to fossil fuels in generating clean energy is solar energy. However, the extraction of maximum energy from the sun is quite difficult. This paper includes a comprehensive

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... view of simple parabolic trough collectors along with geometrical analysis, thermal efficiency, and applications. The applications of PTC include water desalination, water heating, increasing the performance that can be utilized for steam generation, etc.