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Abstract
The present thesis introduces an investigation of performance for two main types of solar thermal collectors, the compound parabolic concentrators and the parabolic trough collectors, for the use in residential, commercial and industrial applications. These collector types are studied according to the temperature level that can be obtained by utilizing proper geometrical and operating conditions, low temperature (with no or low concentration) and medium temperature (with medium concentration). A generalized mathematical model for optical and thermal behavior of solar thermal collectors is developed and applied to the different collector types. A numerical solution procedure is then proposed and applied to the developed mathematical models. Simulation outputs are validated against experimental measurements and calculations obtained from the available test-runs. Different performance indices are used to assess and compare the performance of different collector types under study