Abstract:

The thermal performance of linear Fresnel reflector concentrator(LFRC)with secondary compound parabolic collector (CPC) reflector and a single-layer glass cover were studied. A heat transfer model of LFRC system in steady state had been established according to energy balance principle. Based on this model, the influence of wind speed, environment temperature, solar radiation intensity, concentration ratio, working fluid speed and inlet temperature etc. on concentrator thermal performance had been analyzed systematically, and the temperature and energy distribution along the receiver tube were also given. The results showed that through the numerical simulation, the solar radiation intensity, concentration ratio and inlet temperature were recognized as the key factors affecting  the thermal performance of this targeted of LFRC, which could reach 72％, while the environment factors such as wind and temperature had less influences. So it was helpful to increase the length of the receiver to improve the thermal performance.

Key words: solar collector, middle-high temperature, two-stage reflection, heat transfer model, efficiency