槽式复合多曲面聚光集热器光热性能研究

Accurate tracking system is one of the factors that limit the distributed application of solar concentrator. Therefore，In this paper，optical simulation and experimental test of a novel non-tracking trough compound parabolic concentrator. Firstly，the variation of the optical performance of the CPC with the incidence angle was simulated by using the optical software TracePro. Under actual conditions，the influence of operating conditions on the thermal characteristics of the concentrator such as outlet temperature and instantaneous heat collection was tested and analyzed，and the effect of glass cover plate on reducing the heat loss of the concentrator is also analyzed. The outcomes manifested that，corresponding actual operation，the overall ray’s receiving rate and concentrating efficiency of the concentrator increase first and then decrease with the operation time，and their maximum values are 96.00% and 72.69% at normal incidence，respectively. At air flow rate is 3.1 m/s，the variation trend of the outlet temperature，instantaneous heat collection with operation time is consistent with the trend of solar radiation，and the average values are 43 ℃ and 448.3 W in sunny days，which are 4.4 ℃ and 53.1 W higher than those in cloudy days，respectively. Furthermore，the average photothermal conversion efficiency of the concentrator in sunny days is 50.5%，and the heat dissipation temperature difference with cover is 19.3 ℃ lower than that without the glass cover. The research results can provide reference for the application of non- tracking compound parabolic concentrator.