An air-based corrugated cavity-receiver for solar parabolic trough concentrators

摘要: A tubular cavity-receiver that uses air as the heat transfer fluid is evaluated numerically using a validated model. The receiver designed for use on large-span (9 m net concentrator aperture width) solar parabolic trough concentrator. Through combination of primary with nonimaging secondary concentrator, collector reaches concentration ratio 97.5. Four different configurations are considered, smooth or V-corrugated absorber tube and single- double-glazed window. collector’s performance characterized by its optical efficiency loss. determined Monte Carlo ray-tracing method. Radiative exchange inside calculated radiation 2D steady-state energy equation, which couples conductive, convective, radiative transfer, solved solid domains cross-section, finite-volume techniques. Simulations Sevilla/Spain at summer solstice noon (direct normal irradiance: 847 W m−2, incidence angle: 13.9°) yield efficiencies between 60% 65% temperature 125 °C 37% 42% 500 °C, depending configuration. losses amount to more than 30% incident constitute largest source For 200 long module operated 300 isentropic pumping power required pump HTF through 11 17 kW.