TAILIEUCHUNG - Solar Collectors and Panels, Theory and Applicationsband (CTB) Part 13

Tham khảo tài liệu 'solar collectors and panels, theory and applicationsband (ctb) part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Ray-Thermal-Structural Coupled Analysis of Parabolic Trough Solar Collector System 351 Fig. 8. Temperature profiles across the circumference on the tube inner surface at the tube outlet section Fig. 9. Effective stress profiles on the tube inner surface along the length direction at 0 270 Construction of eccentric tube receiver To meet the above requirements of the new type receiver the eccentric tube receiver for parabolic trough collector system is introduced. Fig. 11 shows the diagram of the eccentric tube receiver. The eccentric tube receiver is proposed on the basis of concentric tube receiver. As seen from this figure the center of internal cylinder surface of concentric tube 352 Solar Collectors and Panels Theory and Applications Fig. 10. Stress failure ratio profiles on the tube inner surface along the length direction at 0 270 Fig. 11. Schematic diagram of physical domain and coordinate system for the eccentric tube receiver. receiver is moved upward or other directions which is not located at the same coordinate position with the center of external cylinder surface. Therefore the wall thickness of the bottom half section of tube receiver will increase without adding any mass to the entire tube receiver. With the same boundary conditions for numerical analyses the increase of wall thickness will not only strengthen the intensity to enhance the resistance of thermal stress Ray-Thermal-Structural Coupled Analysis of Parabolic Trough Solar Collector System 353 but also can increase the thermal capacity which in turn will be benefit to alleviate the extremely nonuniform temperature distribution situation. As seen from Fig. 11 the origin of coordinate system is placed at the center of the external cylinder surface. In this study the vector eccentric radius r the origin of coordinate system points to the center of the internal cylinder surface the vector eccentricity s the projection of vector r on the y-axis and the oriented angle 0 the angle between the .

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