Abstract
This study examined the influence of the oscillatory time variation in the attitude angle of compound parabolic concentrator (CPC) on the thermal performance of CPC. Two experimental CPC models were constructed, one of which was fixed and the other one was provided with two rotational motions (pitch and roll) under sunlight irradiance. By comparing the temperatures of thermal collectors in the two CPCs, the influence by the oscillation was evaluated. Experimental results demonstrated that the oscillation can decrease or increase the temperatures depending on the centre and amplitude of oscillation. To see in more detail the influence of oscillation, exergy budgets were analysed. It is found that the rotational motions of CPC tend to decrease the exergy efficiency by a few percentages, whereas it can improve the efficiency by a few percentages by minimising the incident angles of solar irradiance around the noon.
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