Thermal Performance of Parabolic Trough Solar Collectors under the Condition of Dramatically Varying DNI

摘要: Abstract Frequently interrupted by dense clouds during the operational period, thermal performance of parabolic trough solar collectors will experience considerable variations. Therefore, both theoretical and experiment studies were developed to analyze dynamic under condition dramatically varying direct normal irradiance (DNI) based on energy balance equations a thermodynamics analysis. Particularly for closed system, this unfavorable weather leads variation in outlet temperature collectors. Consequently, main factors which impact running status whole system are coupled make heat transfer processes complex. In order eliminate important errors due fluctuations DNI, differential control volume methodology was used model each time intervals data acquisition system.