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Today, solar parabolic trough collectors are the most appropriate 6 technologies in solar power generation due to higher efficiencies in comparison 7 with other collector types. In this paper, a numerical heat transfer model is 8 considered, for simulation of this equipment. The inlet heat flux to the absorber 9 is calculated to be considered as a boundary condition for the external surface 10 of the absorber. Temperature distribution on the absorber is obtained, by the 11 aid of energy equilibrium modeling. Thereupon, thermal and pressure stress at 12 absorber are analyzed in the model by thermal results and finite element 13 methods. In this study, the direct steam generation system is used as the basis 14 for the work. High thermal stress is a defect in direct steam generation systems. 15 In this research thermal performance is improved and stress tolerance can 16 be increased by using the coating on absorber surface. At the end, the most 17 suitable coating is introduced among the variety of considered coatings 18 types. 19

Effects of different coatings on thermal stress of solar parabolic 1 trough collector absorber in direct steam generation systems 2